CSM_A3S_DS_E_7_1
1
Lighted Pushbutton Switch (Square)
A3S
Pushbutton Switch Series with
Square 40-mm Body
• Combines miniature design with distinct but soft sense of operation.
• Easy panel mounting from the front and simple lamp replacement
without tools.
Refer to Safety Precautions for All Pushbutton Switches/
Indicators and Safety Precautions on page 18.
List of Models
Lighted Pushbutton Switches
Appearance Model
Rectangular A3SJ
Square A3SA
■ Specifications: Refer to page 12. ■ Dimensions: Refer to page 14.
■ Accessories: Refer to pages 10 to 11.
A3S
2
Model Number Structure
Model Number Legend ..... The model numbers used to order sets are illustrated below. One set comprises the Operation Unit, Lamp,
and Socket Unit. For information on combinations, refer to Ordering Information on pages 3 to 4.
Type Structure of Split-screen Operation Unit
1 - 24E R ............ Single screen
(1) (2) Left Right
A 3 S J - 9 0 A 3 - 24E RW ............ Vertical 2-split screen
(2)
Switch Specifications
Standard Load
Microload
• Standard Load
250 VAC, 2 A
125 VDC, 0.4 A
• Microload
125 VAC, 0.1 A
30 VDC, 0.1 A
Minimum applicable load
5 VDC, 1 mA
Momentary operation
...Self-resetting
Alternate operation
...Self-holding
Symbol
Operation
A
Momentary SPDT
B
Alternate
C
Momentary DPDT
D
Alternate
Symbol
Operation
E
Momentary SPDT
F
Alternate
G
Momentary DPDT
H
Alternate
(1) Shape of
Operation Unit
Sym-
bol
Shape
JRectan-
gular
A Square
(3) Screen Pattern
Illumination-only models
• Models with colored illumination
can be ordered individually. Refer
to page 5 for details.
Colored Illumination
Symbol
Screen pattern
1
Single screen
3
Vertical 2-split screen
(rectangular models only)
White Color
Unlit Lit
The built-in
LED is colored.
Left Right
R
(Red)
W
(White)
(4) Lighting Method
LED-lighted Models
Symbol
Rated
voltage
05E 5 VDC
12E 12 VDC
24E 24 VDC
(5)
Operation Unit Color
For LED
Incandescent
Lamp-lighted Models
* The color cap is transparent.
Symbol
Color
RRed
YYellow
G Green
W White *
Symbol
Color
RRed
YYellow
G Green
ABlue
W White *
Number of Built-in LEDs and Incandescent Lamps
Model
Screen pattern
LED
Incandescent lamp
A3SJ
Single screen 2 1
Vertical 2-split
screen 22
A3SA Single screen 1 1
Incandescent
Lamp-lighted Models
Symbol
Rated
voltage
06 6 VAC/VDC
14 14 VAC/VDC
28 28 VAC/VDC
Single screen
(Rectangular models
and square models)
Vertical 2-split screen
(Rectangular models only)
A3SJ
Color cap
Legend plate *
Dispersion plate
Light-separation plate
(2-split screen only)
LED/incandescent
lamp holder
* Not included for the Square Models (A3SA) with
incandescent lamp.
A3S
3
Ordering Information
Ordering as a Set .................The model numbers used to order sets of Units are given in the following tables. One set comprises the
Operation Unit, Lamp, and Socket Unit.
Standard Loads
* Incandescent lamp only.
* Incandescent lamp only.
Microloads
* Incandescent lamp only.
Single screen
Contact type Standard load (250 VAC, 2 A; 125 VDC 0.4 A) Operation Unit
color symbol
Operation Momentary operation
(Self-resetting)
Alternate operation
(Self-holding)
Output Lighting
SPDT
LED
5 VDC A3SJ-90A1-05E@A3SJ-90B1-05E@
Enter the desired color
symbol for the Pushbutton
in @.
R (Red)
Y (Yellow)
G (Green)
A (Blue) *
W (White)
12 VDC A3SJ-90A1-12E@A3SJ-90B1-12E@
24 VDC A3SJ-90A1-24E@A3SJ-90B1-24E@
Incandescent
lamp
6 VAC/VDC A3SJ-90A1-06@A3SJ-90B1-06@
14 VAC/VDC A3SJ-90A1-14@A3SJ-90B1-14@
28 VAC/VDC A3SJ-90A1-28@A3SJ-90B1-28@
DPDT
LED
5 VDC A3SJ-90C1-05E@A3SJ-90D1-05E@
12 VDC A3SJ-90C1-12E@A3SJ-90D1-12E@
24 VDC A3SJ-90C1-24E@A3SJ-90D1-24E@
Incandescent
lamp
6 VAC/VDC A3SJ-90C1-06@A3SJ-90D1-06@
14 VAC/VDC A3SJ-90C1-14@A3SJ-90D1-14@
28 VAC/VDC A3SJ-90C1-28@A3SJ-90D1-28@
Rectangular Models
A3SJ
Single
screen 1Vertical 2-split
screen 1 2
Vertical 2-split screen
Contact type Standard load (250 VAC, 2 A; 125 VDC 0.4 A) Operation Unit
color symbol
Operation Momentary operation
(Self-resetting)
Alternate operation
(Self-holding)
Output Lighting
SPDT
LED 24 VDC A3SJ-90A3-24E@@ A3SJ-90B3-24E@@ Enter the desired color
symbol for the Pushbutton
in @@.
R (Red)
Y (Yellow)
G (Green)
W (White)
A (Blue) *
Incandescent
lamp 28 VDC A3SJ-90A3-28@@ A3SJ-90B3-28@@
DPDT
LED 24 VDC A3SJ-90C3-24E@@ A3SJ-90D3-24E@@
Incandescent
lamp 28 VDC A3SJ-90C3-28@@ A3SJ-90D3-28@@
Single screen
Contact type
Microload
(125 VAC, 0.1 A; 30 VDC 0.1 A)
Operation
Unit color
symbol
Operation Momentary operation
(Self-resetting)
Output
Lighting
SPDT
LED
5 VDC A3SJ-90E1-05E@
Enter the
desired col-
or symbol
for the
Pushbutton
in @.
R (Red)
Y (Yellow)
G (Green)
A (Blue) *
W (White)
12 VDC A3SJ-90E1-12E@
24 VDC A3SJ-90E1-24E@
Incan-
descent
lamp
6 VAC/VDC
A3SJ-90E1-06@
14 VAC/VDC
A3SJ-90E1-14@
28 VAC/VDC
A3SJ-90E1-28@
DPDT
LED
5 VDC A3SJ-90G1-05E@
12 VDC A3SJ-90G1-12E@
24 VDC A3SJ-90G1-24E@
Incan-
descent
lamp
6 VAC/VDC
A3SJ-90G1-06@
14 VAC/VDC
A3SJ-90G1-14@
28 VAC/VDC
A3SJ-90G1-28 @
Vertical 2-split screen
Contact type
Microload
(125 VAC, 0.1 A; 30 VDC 0.1 A)
Operation
Unit color
symbol
Operation Momentary operation
(Self-resetting)
Output
Lighting
SPDT
LED 24 VDC A3SJ-90E3-24E@@ Enter the
desired col-
or symbol
for the
Pushbutton
in @@.
R (Red)
Y (Yellow)
G (Green)
W (White)
A (Blue) *
Incan-
descent
lamp
28 VDC A3SJ-90E3-28@@
DPDT
LED 24 VDC A3SJ-90G3-24E@@
Incan-
descent
lamp
28 VDC A3SJ-90G3-28@@
Individual models: Refer to pages 6 to 9.
(The Pushbutton, Lamp, and Switch can be ordered separately.)
■ Specifications: Refer to page 12. ■ Dimensions: Refer to page 14.
■
Accessories: Refer to pages 10 to 11.
A3S
4
Ordering Information
Ordering as a Set ................. The model numbers used to order sets of Units are given in the following tables. One set comprises the
Operation Unit, Lamp, and Socket Unit.
Standard Loads
* Incandescent lamp only.
Microloads
* Incandescent lamp only.
Single screen
Contact type Standard load (250 VAC, 2 A; 125 VDC 0.4 A) Operation Unit
color symbol
Operation Momentary operation
(Self-resetting)
Alternate operation
(Self-holding)
Output Lighting
SPDT
LED
5 VDC A3SA-90A1-05E@A3SA-90B1-05E@
Enter the desired color
symbol for the Pushbutton
in @.
R (Red)
Y (Yellow)
G (Green)
A (Blue) *
W (White)
12 VDC A3SA-90A1-12E@A3SA-90B1-12E@
24 VDC A3SA-90A1-24E@A3SA-90B1-24E@
Incandescent
lamp
6 VAC/VDC A3SA-90A1-06@A3SA-90B1-06@
14 VAC/VDC A3SA-90A1-14@A3SA-90B1-14@
28 VAC/VDC A3SA-90A1-28@A3SA-90B1-28@
DPDT
LED
5 VDC A3SA-90C1-05E@A3SA-90D1-05E@
12 VDC A3SA-90C1-12E@A3SA-90D1-12E@
24 VDC A3SA-90C1-24E@A3SA-90D1-24E@
Incandescent
lamp
6 VAC/VDC A3SA-90C1-06@A3SA-90D1-06@
14 VAC/VDC A3SA-90C1-14@A3SA-90D1-14@
28 VAC/VDC A3SA-90C1-28@A3SA-90D1-28@
Single screen
Contact type
Microload
(125 VAC, 0.1 A; 30 VDC 0.1 A) Operation Unit
color symbol
Output Lighting
Operation Momentary operation
(Self-resetting)
SPDT
LED
5 VDC A3SA-90E1-05E@
Enter the desired color
symbol for the Pushbutton
in @.
R (Red)
Y (Yellow)
G (Green)
A (Blue) *
W (White)
12 VDC A3SA-90E1-12E@
24 VDC A3SA-90E1-24E@
Incandescent
lamp
6 VAC/VDC A3SA-90E1-06@
14 VAC/VDC A3SA-90E1-14@
28 VAC/VDC A3SA-90E1-28@
DPDT
LED
5 VDC A3SA-90G1-05E@
12 VDC A3SA-90G1-12E@
24 VDC A3SA-90G1-24E@
Incandescent
lamp
6 VAC/VDC A3SA-90G1-06@
14 VAC/VDC A3SA-90G1-14@
28 VAC/VDC A3SA-90G1-28@
Square Models
A3SA
Single
screen
Individual models: Refer to pages 6 to 9.
(The Pushbutton, Lamp, and Switch can be ordered separately.)
■ Specifications: Refer to page 12. ■ Dimensions: Refer to page 14.
■
Accessories: Refer to pages 10 to 11.
A3S
5
Ordering Information
Illumination-only and Colored-illumination LED Models
Example: Red LED
Example: Red LED
Ordering .......................................With colored-illumination models, order the Display (Operation Unit), Lamp, and Socket Unit as shown in the
following table.
describes LED models for which the screen color is the same whether the LED is lit or not. The screen simply becomes brighter
when the LED lights.
describes LED models for which the screen color is white when the LED is not lit and changes to the color of
the LED lamp when the LED is lit.
Display (Operation Unit) LED Socket Unit
Rectangular
models A3SJ-5801
Select the LED lamps to suit your desired
coloration from the selection on page 9.
Select from the Switches on
page 9.
Square models A3SA-5801
Rectangular
models only A3SJ-5921
Illumination only
Color cap (red)
Red
Not lit
Legend plate
(transparent)
Dispersion plate
(milk-white)
LED lamp holder
LED (red)
Display
Red
Lit
Colored illumination
Color cap (transparent)
White
Not lit
Legend plate
(transparent)
Dispersion plate
(milk-white)
LED lamp holder
LED (red)
Pushbutton
Red
Lit
Single screen
2-split screen
A3S
6
Ordering Information
Ordering Individually......... Operation Units, Lamps, and Socket Units can be ordered separately. Combinations that are not available as
sets can be created using individual Units. Also, store the parts as spares for maintenance and repairs.
Ordering ....................................... Specify a model number from the following page.
LED-lighted Models
Incandescent Lamp-lighted Models
Operation Unit Operation Unit
Lamp (LED) Lamp (Incandescent Lamp)
Socket Unit Socket Unit
· DC-only
SLL-@@E@
· Standard lamp
SLL-@@
Ordering set combinations: Refer to pages 3 to 4. ■ Specifications: Refer to page 12. ■ Dimensions: Refer to page 14.
■
Accessories: Refer to pages 10 to 11.
A3S
7
Ordering Information
Ordering Individually .........Operation Units, Lamps, and Socket Units can be ordered separately. Combinations that are not available as
sets can be created using individual Units. Also, store the parts as spares for maintenance and repairs.
Operation Unit
LED-lighted Models
(LED is not built in.)
Note: The color cap is transparent when the display color is white.
* Two-split screen configurations are given with the OMRON surface of the case downward.
Appearance Rectangular Models
(2 LEDs)
(transparent legend
plate built in)
Square Models
(1 LED)
(transparent legend
plate built in)
Screen pattern Display color
Single screen
White A3SJ-5801 A3SA-5801
Red A3SJ-5802 A3SA-5802
Green A3SJ-5803 A3SA-5803
Yellow A3SJ-5805 A3SA-5805
2-split
screen *
Standard
split
screen
White/red A3SJ-5901
−
White/green A3SJ-5902
White/yellow A3SJ-5904
Red/green A3SJ-5905
Red/yellow A3SJ-5907
Green/yellow A3SJ-5909
Reverse
split
screen
Red/white A3SJ-5911
−
Green/white A3SJ-5912
Yellow/white A3SJ-5914
Green/red A3SJ-5915
Yellow/red A3SJ-5917
Yellow/green A3SJ-5919
One-color
2-split
screen
White/white A3SJ-5921
−
Red/red A3SJ-5922
Green/green A3SJ-5923
Yellow/yellow
A3SJ-5925
Ordering set combinations: Refer to pages 3 to 4. ■ Specifications: Refer to page 12. ■ Dimensions: Refer to page 14.
■
Accessories: Refer to pages 10 to 11.
A3S
8
Ordering Information
Ordering Individually......... Operation Units, Lamps, and Socket Units can be ordered separately. Combinations that are not available as
sets can be created using individual Units. Also, store the parts as spares for maintenance and repairs.
Operation Unit
Incandescent Lamp-lighted Models
(Incandescent lamp is not built in.)
Note: The color cap is transparent when the display color is white.
* Two-split screen configurations are given with the OMRON surface of the case downward.
Appearance Rectangular
(transparent legend
plate built in)
Square
(Legend plate not
included)
Screen pattern Display color
Single screen
One lamp
White A3SJ-5301 A3SA-5301
Red A3SJ-5302 A3SA-5302
Green A3SJ-5303 A3SA-5303
Blue A3SJ-5304 A3SA-5304
Yellow A3SJ-5305 A3SA-5305
Two lamps
White A3SJ-5321
−
Red A3SJ-5322
Green A3SJ-5323
Blue A3SJ-5324
Yellow A3SJ-5325
2-split
screen *
Standard
split
screen
White/red A3SJ-5201
−
White/green A3SJ-5202
White/blue A3SJ-5203
White/yellow A3SJ-5204
Red/green A3SJ-5205
Red/blue A3SJ-5206
Red/yellow A3SJ-5207
Green/blue A3SJ-5208
Green/yellow A3SJ-5209
Blue/yellow A3SJ-5210
Reverse
split
screen
Red/white A3SJ-5211
−
Green/white A3SJ-5212
Blue/white A3SJ-5213
Yellow/white A3SJ-5214
Green/red A3SJ-5215
Blue/red A3SJ-5216
Yellow/red A3SJ-5217
Blue/green A3SJ-5218
Yellow/green A3SJ-5219
Yellow/blue A3SJ-5220
One-color
2-split
screen
White/white A3SJ-5221
−
Red/red A3SJ-5222
Green/green A3SJ-5223
Blue/blue A3SJ-5224
Yellow/yellow
A3SJ-5225
Ordering set combinations: Refer to pages 3 to 4. ■ Specifications: Refer to page 12. ■ Dimensions: Refer to page 14.
■
Accessories: Refer to pages 10 to 11.
A3S
9
Ordering Information
Ordering Individually .........Operation Units, Lamps, and Socket Units can be ordered separately. Combinations that are not available as
sets can be created using individual Units. Also, store the parts as spares for maintenance and repairs.
Lamp
LED Lamp
Note: The A3SJ (M2SJ) requires two LEDs for each Switch. The A3SA (M2SA) requires one LED.
Incandescent Lamp
Note: The low-voltage lamp has an advantage in that it generates less heat.
Switch (common to both LED models and incandescent lamp-lighted models)
Operating
voltage 5 VDC 12 VDC 24 VDC
Color Model (DC only) Model (DC only) Model (DC only)
Red SLL-05ER SLL-12ER SLL-24ER
Yellow SLL-05EY SLL-12EY SLL-24EY
Green SLL-05EG SLL-12EG SLL-24EG
White SLL-05EW SLL-12EW SLL-24EW
Lamp type
Operating voltage Standard lamp Low-voltage lamp
5 VAC/VDC SLL-06 SLL-06H
12 VAC/VDC SLL-14 SLL-14H
24 VAC/VDC SLL-28 SLL-28H
Number
of
outputs
Appearance Rectan-
gular
models
Square
models Selection precautions
Contact type Operation
Stan-
dard
load
Silver
contacts
1
Momentary operation
A3SJ-8010 A3SA-7010
• Use the Socket Unit in
combination with the same
shape Operation Unit
(rectangular or square).
Example:
For the A3SJ-5801 Rectan-
gular Operation Unit, select
the A3SJ-8
@@
0
Socket Unit.
• Momentary operation is
self-resetting, and alternate
operation is self-holding (i.e.,
push-on, push-off).
Alternate operation A3SJ-8020 A3SA-7020
2
Momentary operation
A3SJ-8030 A3SA-7030
Alternate operation A3SJ-8040 A3SA-7040
Micro-
load
Gold
alloy
contacts
1
Momentary operation
A3SJ-8050 A3SA-7050
Alternate operation A3SJ-8060 A3SA-7060
2
Momentary operation
A3SJ-8070 A3SA-7070
Alternate operation A3SJ-8080 A3SA-7080
A3S
10
Ordering Information
Accessories, Replacements, and Tools
Accessories for Rectangular Models
Accessories for Square Models
Name Appearance Classification Model Application precautions
Barrier
Short edge Barriers (1 pair) A3SA-4001
The purpose of a Barrier is to prevent malfunctioning
and to improve design image of the mounting panel.
There is one intermediate Barrier and one pair of
edge Barriers (2 Barriers).
Mount Short Barriers horizontally.
Mount Long Barriers vertically.
Short intermediate Barriers A3SA-4002
Long edge Barriers (1 pair) A3SJ-4003
Long intermediate Barriers A3SJ-4004
Switch Guard −A3SJ-5050 Cannot be used with Barrier or Seal Cover.
Seal Cover −A3SJ-5060 • Cannot be used with Barrier or Switch Guard.
• Cap material: Vinyl chloride
Long
Mounting Plate 1 pair A3SJ-3002
Use when vertically mounting individual (with Barrier)
or multiple Switches (in standard mounting style and
with Barrier). A Short Mounting Plate is attached to
the Switch; replace it with the long one.
Name Appearance Classification Model Application precautions
Barrier
Short Edge Barriers (1 pair) A3SA-4001 The purpose of the Barrier is to prevent malfunction-
ing and to improve design image of the mounting
panel.
Short Intermediate Barrier A3SA-4002
Switch Guard −A3SA-5050 Cannot be used with Barrier or Seal Cover.
Seal Cover −A3SA-5060 • Cannot be used with Barrier or Switch Guard.
• Cap material: Vinyl chloride
■ Accessory mounting: Refer to page 19.
A3S
11
Ordering Information
Accessories, Replacements, and Tools
Replacements for Rectangular Models
Replacements for Square Models
Tools
Name Appearance Classification Model Application precautions
Socket
Wire-wrap terminals A3SJ-4104
• Sockets cannot be used for multiple mounting.PCB terminals A3SJ-4105
Solder terminals A3SJ-4106
Dispersion
plate Milk-white Single screen A3SJ-5107 −
Color cap
Transparent
Single screen
A3SJ-5600
• Contact your OMRON representative for color
changes or inscribing.
• If LEDs are to be used, use a color cap that
matches the LED color.
• The blue color cap is only for incandescent lamps.
White A3SJ-5601
Red A3SJ-5602
Green A3SJ-5603
Blue A3SJ-5604
Yellow A3SJ-5605
Transparent
2-split screen
A3SJ-5630
White A3SJ-5631
Red A3SJ-5632
Green A3SJ-5633
Blue A3SJ-5634
Yellow A3SJ-5635
Legend plate
Transparent A3SJ-4204 A transparent legend plate is mounted on the
Operation Unit.
Milk-white A3SJ-4203
Name Appearance Classification Model Application precautions
Socket
Wire-wrap terminals A3SA-4101
• Sockets cannot be used for multiple mounting.PCB terminals A3SA-4102
Solder terminals A3SA-4103
Dispersion
plate Milk-white A3SA-5107 −
Color cap
Transparent A3SA-5600
• Contact your OMRON representative for color
changes or inscribing.
• If LED colors are to be used, use a color cap that
matches the LED color.
White A3SA-5601
Red A3SA-5602
Green A3SA-5603
Blue A3SA-5604
Yellow A3SA-5605
Legend plate
Transparent A3SA-4204 A transparent color cap is mounted to a standard
Display. Legend plates cannot be used, however,
with Displays for incandescent lamps.
Milk-white A3SA-4203
Name Appearance Classification Model Application precautions
Extractor −A3PJ-5080 Convenient for extracting the Operation Unit.
■ Accessory mounting: Refer to page 19.
A3S
12
Specifications
Approved Standard Ratings
UL (File No. E41515), CSA (File No. LR45258)
Standard Load: 3 A at 125 VAC
2 A at 250 VAC
Microload: 0.1 A at 125 VAC
0.1 A at 30 VDC
Note: Certification has been obtained for the Switch Unit.
For detailed information on individual products that have received
certification, consult your supplier.
Ratings
For Standard Loads
Note: 1. The above values are for steady-state currents.
2. Inductive load: Power factor = 0.4; time constant = 7 ms.
3. The lamp load has an inrush current of 10 times the steady-state
current.
4. The motor load has an inrush current of 6 times the steady-state
current.
The rated values are for testing conducted under the following conditions.
(1) Ambient temperature: 20±2°C
(2) Ambient humidity: 65% ±5%RH
(3) Operating frequency: 20 times/min
For Microloads
LED Lamp
Incandescent Lamp
Characteristics
*1. With alternate operation models, 60 operations/min max. One operation
cycle consists of set and reset operations.
*2. With no incandescent lamp or LED lamp mounted.
*3. Malfunction : 1 ms max.
Operating Characteristics
Contact Form
Rated
voltage
Non-inductive load (A) Inductive load (A)
Resistive
load
Lamp load
Inductive
load
Motor load
NC NO NC NO NC NO NC NO
125 VAC
250 VAC
3
2
1
0.7
0.7
0.5
2
1.5
1.5
1
1
0.7
8 VDC
14 VDC
30 VDC
125 VDC
250 VDC
3
3
2
0.4
0.2
1
1
1
0.05
0.03
2
1.5
1.5
0.4
0.2
1.5
1.5
1
0.05
0.03
Rating 0.1 A at 30 VDC (resistive load);
0.1 A at 125 VAC (resistive load)
Minimum
applicable load 1 mA at 5 VDC
Type Applied
voltage
Rated
voltage
Rated
current
Built-in
limiting
resistance
DC only
5 VDC±5% 5 VDC 30 mA 39 Ω
12 VDC±5% 12 VDC 15 mA 270 Ω
24 VDC±5% 24 VDC 12.5 mA 1300 Ω
Applied
voltage Rated voltage
Standard
lamp
Low-power
lamp
Rated current Rated current
5 VAC/VDC 6 VAC/VDC 200 mA 100 mA
12 VAC/VDC 14 VAC/VDC 80 mA 40 mA
24 VAC/VDC 28 VAC/VDC 40 mA 25 mA
Operating
frequency
Mechanical Momentary operation models: 120
operations/min max. *1
Electrical 20 operations/min max.
Insulation resistance 100 MΩ min. (at 500 VDC)
Contact
resistance
Standard load 50 mΩ max. (initial value)
Microload 50 mΩ max. (initial value)
Dielectric
strength
Between terminals
of same polarity 1,000 VAC, 50/60 Hz for 1 minute
Between terminals
of different polarity 2,000 VAC, 50/60 Hz for 1 minute
Between current-
carrying metal part
and ground
2,000 VAC, 50/60 Hz for 1 minute
Between each terminal
and non-current-carry-
ing metal part
2,000 VAC, 50/60 Hz for 1 minute
Between lamp
terminals
1,000 VAC, 50/60 Hz for 1 minute
*2
Vibration
resistance
Malfunction 10 to 55 Hz, 1.5-mm double
amplitude *3
Shock
resistance
Destruction 500 m/s2 max.
Malfunction 200 m/s2 max. *3
Life
expect-
ancy
Mechanical
Momentary operation models:
1,000,000 operations min.
Alternate operation models:
100,000 operations min.
(One operation consists of set and
reset operations.)
Electrical
100,000 operations min. (rated load)
Weight Approx. 10 g
Inrush
current
NC Standard load: 10 A max.
NO Standard load: 10 A max.
Ambient operating
temperature
−10 to 50°C
(with no icing or condensation)
Ambient operating humidity
35% to 85% RH
Ambient storage temperature
−25 to 65°C
(with no icing or condensation)
Degree of protection IP00
Electric shock protection class
Class II
PTI (proof tracking index) 175
Pollution degree 3 (IEC 60947-5-1)
Operation
Momentary
operation models
Alternate
operation models
Operating
characteristics
Operating force OF max.
3.92 N 4.90 N
Releasing force RF min.
0.49 N 0.294 N
Total travel TT
Approx. 3 mm Approx. 3 mm
Pretravel PT max.
2.2 mm 2.2 mm
Lock travel
alternate
LTA min.
−0.5 mm
Name Contact Form
Double-throw contacts COM
NO
NC
A3S
13
Nomenclature
Model Structure
Operation Unit Structure
Color cap
Legend plate *
Dispersion plate
Rectangular
Models
A3SJ
Square
Models
A3SA
LED/incandescent lamp holder
Single screen
Lighting method
· LED · Incandescent lamp
Note: The A3SJ is shown here as an example.
Vertical 2-split screen
* Not included for the Square Models (A3SA) with
incandescent lamp.
Screen pattern
· LED-lighted models
White , Red , Green , Yellow
· Incandescent lamp-lighted model
White , Red , Green , Blue , Yellow
· Standard load
250 VAC, 2 A
125 VAC, 3 A
30 VDC, 2 A
· Microload
125 VAC, 0.1 A
30 VDC, 0.1 A
Operation Unit colors
Operation Unit
Lamp
Socket Unit
A3S
14
Dimensions The Dimension shows 2-switch outputs. (Unit: mm)
Note: Unless specified, a tolerance of ±0.4 mm applies for all dimensions. Use a mounting panel thickness of 1 to 4 mm.
Terminal Arrangement
Bottom View (All are shown with the OMRON logo facing down.)
Note: The arrangements given above are not indicated on the Socket Unit.
Contact Type
Incandescent Lamp-lighted Models (The terminal arrangements are the same as for the LED-lighted models.)
LED Lamp-lighted Models
Rectangular Models (A3SJ) Square Models (A3SA)
SPDT DPDT SPDT DPDT
Type Model Rectangular Models (A3SJ) Square Models (A3SA)
SPDT
DPDT
Type Model Rectangular Models (A3SJ) Square Models (A3SA)
SPDT
DPDT
17.8±0.2
24±0.2 1.8±0.1
13.2
4.2
32.5
40
2.8
15.8±0.2
Tab terminal #110
1.2
8.2
0.5
14.1 19.1 22±0.2
19.4
OMRON logo
Rectangular Models (A3SJ)
13.2
17.8±0.2
17.8±0.2
13.2
32.5
40
2.8
15.8±0.2
Tab terminal #110
13.2
OMRON logo 0.5
4.5
1.8
10.4 15.8±0.2
1.8±0.14.2
Square Models (A3SA)
LA+
LA- LB+
LB-
11.8
NC1
NO1
C1
1.5
19.1
14.1
8.8 LA+
LA- LB+
LB-
11.8
NC1
NO1
C1
NC2
NO2
C2
1.5
14.1
8.8
19.1
8.2
L+
L-
11.8
NC1
NO1
C1
8.8
10.4 2
0.5
L+
L-
11.8
NC1
NO1
C1
NC2
NO2
C2
8.8
10.4
2
0.5
4.5
LA+
LA- LB+
LB-
NC1
NO1
C1
Terminal arrangement
BOTTOM VIEW TOP VIEW
Lighting bloc
k
L+
L-
NC1
NO1
C1
Terminal arrangement
BOTTOM VIEW TOP VIEW
Lighting bloc
k
LA+
LA- LB+
LB-
NC1
NC2
NO1
NO2
C1 C2
Terminal arrangement
BOTTOM VIEW TOP VIEW
Lighting block
L+
L-
NC1
NC2
NO1
NO2
C1 C2
Terminal arrangement
BOTTOM VIEW TOP VIEW
Lighting bloc
k
NC1 LB-
LB+
C1
NO1
LA+
LA-
Terminal arrangement
BOTTOM VIEW TOP VIEW
Lighting block
NC1
C1 L-
L+
NO1
BOTTOM VIEW TOP VIEW
Terminal arrangement
Lighting bloc
k
NC1 NC2
LB-
LB+
C1 C2
NO1
NO2
LA+
LA-
BOTTOM VIEW TOP VIEW
Terminal arrangement
Lighting block
NC1
NC2
C1
C2
L-
L+
NO1
NO2
TOP VIEWBOTTOM VIEW
Terminal arrangement
Lighting bloc
k
A3S
15
Dimensions (Unit: mm)
Panel Cutout (If using a Switch Guard or Seal Cover, refer to the panel cutout diagrams on page 17.)
Rectangular Models (A3SJ)
* If the panel is to be finished (e.g., coated), make sure that the panel meets the specified dimensions after the coating.
Square Models (A3SA)
* If the panel is to be finished (e.g., coated), make sure that the panel meets the specified dimensions after the coating.
Classification Mounting design Panel cutout Remarks
Flange
mount
models
Individual
mounting,
horizontal Panel cutout spacing between rows of
Units:
Multiple
mounting,
horizontal
Individual
mounting,
vertical
Multiple
mounting,
vertical
Barrier
mount
models
Individual
mounting,
horizontal Panel cutout spacing between rows of
Units:
Dotted line indicates the position of each
mounting Barrier.
Multiple
mounting,
horizontal
Individual
mounting,
vertical
Multiple
mounting,
vertical
Classification Mounting design Panel cutout Remarks
Flange
mount
models
Individual
mounting
Panel cutout spacing between rows of
Units:
Multiple
mounting
Barrier
mount
models
Individual
mounting
Panel cutout spacing between rows of
Units:
Dotted line indicates the position of each
mounting Barrier.
Multiple
mounting
17.8
±0.2
24
±0.2
16.2±0.2
22.4±0.2
3 min.
6 min.
17.8
±0.2 12 n
24n±0.5
16.2±0.2
24n-1.6 ±0.2
24 ±0.2
17.8 ±0.2
Mount to Long
Mounting Plate
(A3SJ-3002)
before use.
22.4±0.2
16.2 ±0.2
24 ±0.2 12 n
17.8n±0.5
Mount to Long
Mounting Plate
(A3SJ-3002)
before use.
22.4±0.2
17.8n-1.6 ±0.2
29.7
19.8
16.2
±0.2
26.9
±0.2
6 min.
4 min.
1.4
25.3n+4.4
19.8
12 n
25.3n+1.6±0.2
16.2 ±0.2
23.5
26
Mount to Long
Mounting Plate
(A3SJ-3002) before
use.
22.4
±0.2
20.7
±0.2
19.1n+4.4
26
12 n
Mount to Long
Mounting Plate
(A3SJ-3002)
before use.
19.1n+1.6 ±0.2
22.4±0.2
17.8±0.2
17.8±0.2
16.2±0.2
16.2±0.2
3 min.
6 min.
17.8n±0.5
17.8±0.2 12 3 n
17.8n-1.6±0.2
16.2±0.2
23.5
19.8
20.7
±0.2
16.2
±0.2
6 min.
1.4 4 min.
19.1n+ 4.4
19.8123 n
19.1n+1.6 ±0.2
16.2±0.2
A3S
16
Dimensions (Unit: mm)
Accessory Mounting Dimensions
Socket-mounting Dimensions
Rectangular Models
11.5 0
-0.1
11.6
11.6
18.4
0.8 0.8
0
-0.1
0
-0.1
0
-0.1
Legend Plate
Rectangular Models
A3SJ-4203/-4204
Square Models
A3SA-4203/-4204
2.52.5
510
20
15
25±2
0.3
50
Extractor
A3PJ-5080
Note: Made from stainless steel.
21.2
15
23.6
15.7±0.6
17.6
47.5
21.2
15
23.6
8.2
17.6
47.5
3
21.2
15
23.6
3.60.5
0.3
17.6
47.5
3
1.2
0.9R 0.6R
3
3.2 0.8
2.851.65
Ten, 1.5-dia. holes
2.9
2.9
1.5
1.5
19.1
14.1
8.2
11.8 8.8
Wire-wrap Terminals
A3SJ-4104
Solder Terminals
A3SJ-4106
PCB Terminals
A3SJ-4105
Terminal Hole Dimensions PCB Cutout
(Bottom View)
A3S
17
Dimensions (Unit: mm)
Square Models
Switch and Guard Mounting Dimensions
Seal Cover Mounting Dimensions
Note: 1. Recommended panel thickness: 1.0 to 3.3 mm
2. Unless otherwise specified, a tolerance of ±0.4 mm applies to all dimensions.
15
47.5
21.2
17.6
17.6
15.7±0.6
15
47.5
21.2
17.6
17.6
3
8.2
15
47.5
21.2
17.6
17.6
0.3
3.60.5
1.2
3
0.9R 0.6R
3
3.2 0.8
2.9 2.2
4.5
10.4
11.8 8.8
5.0
Eight, 1.5-dia. holes
The OMRON logo is
downward on the Socket Unit.
Wire-wrap Terminals
A3SA-4101
Solder Terminals
A3SA-4103
PCB Terminals
A3SA-4102
Terminal Hole Dimensions PCB Cutout
(bottom view)
22.4±0.3
8.5
min.
Panel Cutouts
Individual Mounting
Multiple Mounting, horizontal
16.2±0.2
16.2±0.2 20
26
26n-3.6±0.2
20+0
-0.2
26+0
-0.2 31.7
39.2
9±0.1
Switch Guard
(A3SJ-5050)
Transparent plate
OMRON logo
Rectangular Models
A3SJ-5050
20+0
-0.2
20+0
-0.2 31.7
39.2
9±0.1
Switch Guard
(A3SA-5050)
Transparent plate
OMRON logo
8.5
min.
16.2±0.2
16.2±0.2
16.2±0.2
20
20
20n-3.8±0.2
Panel Cutouts
Individual Mounting
Multiple Mounting, horizontal
Square Models
A3SA-5050
31.8
39.3
8.3
Transparent plate
OMRON logo
Seal Cover
(A3SJ-5060) Black
30.5
24.3
22.4±0.3
22.4±0.3
8.5
min.
Panel Cutouts
Individual Mounting
Multiple Mounting, horizontal
16.2±0.2
16.2±0.2
8.5 min.
Rectangular Models
ASJ-5060
31.8
39.3
8.3
Seal Cover
(A3SA-5060)
Black
24.3
24.3
Transparent plate
OMRON logo
8.5
min.
16.2±0.2
16.2±0.2
16.2±0.2
16.2±0.2
8.5 min.
Panel Cutouts
Individual Mounting
Multiple Mounting, horizontal
Square Models
A3SA-5060
A3S
18
Safety Precautions
Refer to Safety Precautions for All Pushbutton Switches/Indicators.
Mounting
•Always make sure that the power is turned OFF before mounting,
removing, or wiring the Switch, or performing maintenance. Electric
shock or fire may occur.
Wiring
•For wiring, use a wire size that is appropriate for the applied voltage
and the supplied current. Be sure to perform soldering according to
the following conditions. Using the Switch with incomplete soldering
may result in errors and heat, which may cause fire.
(1) Manual soldering: Use a soldering iron with a tip temperature of
350°C maximum and complete soldering within 3 seconds.
(2) Dip soldering: Solder at 350°C for 3 s or less.
Wait for one minute after soldering before exerting any external
force on the solder.
•Use non-corrosive liquid rosin as the flux.
•If screw-tightened terminals are used, hold the Socket Unit Set or
Socket Unit and install the lead wiring applying a torque of less than
0.98 N·m to the Socket Unit. Applying a torque of more than 0.98
N·m may result in damage. The tightening torque is 0.59 to 0.78
N·m.
•Make sure that the insulating sheath of the wires does not come in
contact with the Unit. If wiring is performed with the insulating
sheath of the wires coming in contact with the Unit, use wire with a
minimum heat resistance of 100°C.
•
After wiring the Switch, make sure that there is a suitable isolation
distance.
Operating Environment
•Do not use in locations that are subject to dust, oil, or metal fillings,
because these may penetrate the interior the Switch and cause
malfunction.
Using Microloads
•Using a standard load switch when a microload circuit is opened or
closed may cause wear on the contacts. Use the switch within the
operating range. (Refer to the diagram below.) Even when using
microload models within the operating range shown below, if inrush
current occurs when the contacts are opened or closed, it may
cause the contact surface to become rough, and so decrease life
expectancy. Therefore, insert a contact protection circuit where
necessary.
The minimum applicable load is the N-level reference value. This
value indicates the malfunction reference level for the reliability
level of 60% (λ 60) (conforming to JIS C5003).
The equation λ 60 = 0.5 x 10−6/time indicates that the estimated
malfunction rate is less than 1/2,000,000 with a reliability level of
60%.
LED Lamp
•A current-limiting resistor for the LED lamp is built in, so no external
resistor is required.
Incandescent Lamp
•It is advantageous in terms of service life and heat generation to
apply 80% of the rated voltage (operating voltage) to the
incandescent lamp.
Operation
•Always mount the Operation Unit before operating the Switch.
(Using your fingers or tweezers to operate moving parts of the
Switch may deform internal parts and cause malfunctions.)
Character Film
•If the character film is to be specially prepared, use heat-resistant
film with a maximum thickness of 0.2 mm.
Others
•If the panel is to be finished (e.g., coated), make sure that the panel
meets the specified dimensions after the coating.
Precautions for Correct Use
Microload area Standard
load area
Invalid
area
0.1 1 10 100 1,000
100 mA 160 mA
1 mA
5
12
24
30
0.15 mA 26 mA 100 mA
Current (mA)
0
Voltage (V)
Rated voltage Built-in limiting resistance
5 VDC 39 Ω
12 VDC 270 Ω
24 VDC 1300 Ω
A3SJ A3SA
11.3±0.2
18.2±0.2 11.3±0.2
11.3±0.2
A3S
19
Application
Replacing Incandescent and LED Lamps and Panel Mounting
Removing the Display
•Grasp the groove on the color cap surface, and pull it firmly toward
you to remove the Display.
•An Extractor (A3PJ-5080) is available to conveniently remove the
Display.
Mounting and Replacing Incandescent and LED Lamps
Inserting the Display into the Socket Unit
Insert the Operation Unit in the proper direction. With the OMRON
logo downward, insert the Operation Unit so that the lamp/LED
terminals on the inside surface of the Unit case and the contactors of
the Display.
Rated Voltage and Color of LED
The LED voltage rating is indicated on the base. Use the LED within
±5% of voltage range.
Mounting to the Switch Panel
Mount the Socket Unit to the panel by inserting it from the front of the
panel.
Mount the Socket Unit so that the OMRON logo is downward.
Barrier Mounting
•Place the Edge Barrier on the side of the Socket Unit, and then
insert it into the panel.
•Insert the Intermediate Barrier between the Switches after inserting
the Socket Units into the panel.
Inscribing Legend Plate Characters
Inscribing
A3SJ (M2SJ)
•Inscription depth: 0.5 mm max.
•The legend plate is made of polycarbonate, so apply an alcohol-
based paint coating, such as melamine, phthalate, or acrylic resin
paint when marking the legend.
•When replacing the legend plate, be careful that the coil spring in
the Display does not become removed.
Terminals for incandescent or LED lamp
(built into the case)
OMRON logo
Contactors
Rated voltage
Illuminating color
(color band)
Edge Barrier
Intermediate
Barrier
Legend plate
A3S
20
Assembling the Legend Plate (Plunger)
A3SA (M2SA)
(LED Lamp)
(1) Assemble the color plate to the plunger, and then assemble the
legend plate on top.
(Incandescent Lamp)
(2) Inscribe the surface of the plunger, and then coat the surface.
Assemble models A3SA-5301 to A3SA-5305 so that the hook is
toward you.
Note: Legend plates cannot be used with A3SA Displays for incandescent
lamps.
(3) Assemble the color cap to the inscribed plunger.
(4) Push in the color in the direction of the arrow to assemble the
plunger and the lamp holder.
A3SA
Perform the assembly so that the wide groove and the hook on the
plunger are in the same direction.
M2SA
Perform the assembly so that the wide groove and the hook on the
plunger are in the same direction.
Lighted Square Pushbutton Switches
Lighted Square Pushbutton Switches
Indicator
Legend plate
Plunger
Dispersion
plate
Hook toward you
Direction of
inscription
Plunger Color cap
Plunger
Terms and Conditions Agreement
Read and understand this catalog.
Please read and understand this catalog before purchasing the products. Please consult your OMRON representative if you
have any questions or comments.
Warranties.
(a) Exclusive Warranty. Omron’s exclusive warranty is that the Products will be free from defects in materials and workmanship
for a period of twelve months from the date of sale by Omron (or such other period expressed in writing by Omron). Omron
disclaims all other warranties, express or implied.
(b) Limitations. OMRON MAKES NO WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED, ABOUT
NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OF THE PRODUCTS. BUYER
ACKNOWLEDGES THAT IT ALONE HAS DETERMINED THAT THE
PRODUCTS WILL SUITABLY MEET THE REQUIREMENTS OF THEIR INTENDED USE.
Omron further disclaims all warranties and responsibility of any type for claims or expenses based on infringement by the
Products or otherwise of any intellectual property right. (c) Buyer Remedy. Omron’s sole obligation hereunder shall be, at
Omron’s election, to (i) replace (in the form originally shipped with Buyer responsible for labor charges for removal or
replacement thereof) the non-complying Product, (ii) repair the non-complying Product, or (iii) repay or credit Buyer an amount
equal to the purchase price of the non-complying Product; provided that in no event shall Omron be responsible for warranty,
repair, indemnity or any other claims or expenses regarding the Products unless Omron’s analysis confirms that the Products
were properly handled, stored, installed and maintained and not subject to contamination, abuse, misuse or inappropriate
modification. Return of any Products by Buyer must be approved in writing by Omron before shipment. Omron Companies shall
not be liable for the suitability or unsuitability or the results from the use of Products in combination with any electrical or
electronic components, circuits, system assemblies or any other materials or substances or environments. Any advice,
recommendations or information given orally or in writing, are not to be construed as an amendment or addition to the above
warranty.
See http://www.omron.com/global/ or contact your Omron representative for published information.
Limitation on Liability; Etc.
OMRON COMPANIES SHALL NOT BE LIABLE FOR SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
LOSS OF PROFITS OR PRODUCTION OR COMMERCIAL LOSS IN ANY WAY CONNECTED WITH THE PRODUCTS,
WHETHER SUCH CLAIM IS BASED IN CONTRACT, WARRANTY, NEGLIGENCE OR STRICT LIABILITY.
Further, in no event shall liability of Omron Companies exceed the individual price of the Product on which liability is asserted.
Suitability of Use.
Omron Companies shall not be responsible for conformity with any standards, codes or regulations which apply to the
combination of the Product in the Buyer’s application or use of the Product. At Buyer’s request, Omron will provide applicable
third party certification documents identifying ratings and limitations of use which apply to the Product. This information by itself
is not sufficient for a complete determination of the suitability of the Product in combination with the end product, machine,
system, or other application or use. Buyer shall be solely responsible for determining appropriateness of the particular Product
with respect to Buyer’s application, product or system. Buyer shall take application responsibility in all cases.
NEVER USE THE PRODUCT FOR AN APPLICATION INVOLVING SERIOUS RISK TO LIFE OR PROPERTY OR IN LARGE
QUANTITIES WITHOUT ENSURING THAT THE SYSTEM AS A WHOLE HAS BEEN DESIGNED TO ADDRESS THE RISKS,
AND THAT THE OMRON PRODUCT(S) IS PROPERLY RATED AND INSTALLED FOR THE INTENDED USE WITHIN THE
OVERALL EQUIPMENT OR SYSTEM.
Programmable Products.
Omron Companies shall not be responsible for the user’s programming of a programmable Product, or any consequence
thereof.
Performance Data.
Data presented in Omron Company websites, catalogs and other materials is provided as a guide for the user in determining
suitability and does not constitute a warranty. It may represent the result of Omron’s test conditions, and the user must correlate
it to actual application requirements. Actual performance is subject to the Omron’s Warranty and Limitations of Liability.
Change in Specifications.
Product specifications and accessories may be changed at any time based on improvements and other reasons. It is our
practice to change part numbers when published ratings or features are changed, or when significant construction changes are
made. However, some specifications of the Product may be changed without any notice. When in doubt, special part numbers
may be assigned to fix or establish key specifications for your application. Please consult with your Omron’s representative at
any time to confirm actual specifications of purchased Product.
Errors and Omissions.
Information presented by Omron Companies has been checked and is believed to be accurate; however, no responsibility is
assumed for clerical, typographical or proofreading errors or omissions.
2016
.
10
In the interest of product improvement, specifications are subject to change without notice.
OMRON Corporation
Industrial Automation Company
http://www.ia.omron.com/
(c)Copyright OMRON Corporation 2016 All Right Reserved.
