APEMwww.apem.com
M3950/16 & M83731/24
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Distinctive features
Approval and lists
M3950/16
M83731/24
QPL listed
This range of professional toggle switches is suitable for use in military and
other high specification environments.
Contacts
Highly reliable contacts suitable for low level applications (10mA 50mV -
10µA 5VDC min.) or power applications (2A 250VAC - 4A 125VAC -
4A 30VDC max.)
Pinned lever
The base of the switch lever is pinned to the bushing, thus earthing the lever to
the bushing. This also provides strain relief to protect the switch if accidentally
knocked.
Double shell case
For high mechanical strength and high electrical insulation.
Compact size
The small rear end of the switch allows space saving behind the panel.
Finish
Matt black finish on body, bushing, lever and hardware.
Sealing
Panel sealed to IP 67, these switches are frontal sealed by two O-rings and
have full rear end sealing.
Accessories
A comprehensive range of protection boots (both full and half length), locking
levers and security caps are available.
APEM www.apem.com
M3950/16 & M83731/24
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Ø 1
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Specifications
MATERIALS
• Case: diallylphthalate (DAP)
with plastic external shell
(epoxy sealed)
• Actuator: brass, black chrome
plated
• Bushing : brass, black chrome
plated
• Contacts : solid rivet -
gold plated silver/nickel alloy
ELECTRICAL SPECIFICATIONS
• Max. current/voltage rating with resistive load : 2A 250VAC - 4A 125VAC - 4A 28VDC
• Minimum load : 10mA 50mV, 10µA 5VDC
When used above 300mA 28VDC, the gold plating is removed on contact areas and is considered only as a
protection against oxidation during storage.
• Initial contact resistance : 10 mΩ max.
• Insulation resistance : 1.000 MΩ min. at 500VDC
• Dielectric strength :
1.000 Vrms 50 Hz min. between terminals
2.000 Vrms 50 Hz min. between poles
2.000 Vrms 50 Hz min. between terminals and frame
• Contact bounce : 2 ms max.
• Electrical life :
- At 2A 250VAC - 4A 28VDC :
20.000 cycles (10.000 for functions 5, 4-1R, 4-2R)
- At low level (50mV 10mA) :
150.000 cycles (switches with 2 maintained positions)
100.000 cycles (switches with 3 maintained positions)
50.000 cycles (momentary functions 7, 8, 4-1R, 4-2R, 5)
GENERAL SPECIFICATIONS
• Torque : 1,50 Nm (1.10 Ft.lb) max. applied to nut
• Panel thickness : 8 mm (.314) max. - 3 mm (.118) min.
• Shock test : 50g - 11ms (IEC 68-2-27)
• Vibrations : 10-500 Hz - 10g (IEC68-2-6)
• Operating temperature : -40°C to +85°C
• Humidity test : 56 days, 93 % R.H., 40°C (IEC 68-2-3)
• Salt spray test : 96 hours (IEC 68-2-11)
APPROVALS
All models within this range are QPL listed and comply with M3950
and M83731
SEALING
•Front panel sealing by two O-rings
Flatted bush for precise orientation
• Panel seal withstands 1 bar pressure and
remains sealed even when the switch is operated.
• Epoxy sealed terminals
• Splash-proof case
Flat
O-rings
Amps
4 A
2 A
10µA
5 VDC
28 VDC
125 VAC
250 VAC
Volts
50 mV
10mA
48 VDC
1 A
1
APEM www.apem.com
M3950/16 & M83731/24
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g Ø
Ø 1
11
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9 (
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5/
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32
2)
)
Overview
Terminals
1Solder lug terminals
2Straight PC terminals
Electrical functions
6ON - ON
9ON OFF ON
7MOM OFF MOM
8ON OFF MOM
Momentary
ANon-momentary
DMomentary
Fluorescent tip
0None
1White fluorescent
tip to lever
Levers
10 Standard lever
12 Short lever
Locking levers
1V 1 locked position
2V 2 locked positions
3V 3 locked positions
ABOUT THIS SERIES
On the following pages, you will find successively :
- model structure of switches
- options in the same order as in above chart
Dimensions : first dimensions are in mm while inches are shown as bracketted numbers.
Sealing boots can be used to further protect the switches against dust and water. They are presented in section H.
Mounting accessories : standard hardware supplied with all models : 1 hex nut 14 mm (.551) across flats, part
number U41. This nut is presented after model structure of switches.
Security caps are available to prevent inadvertent lever operation. They are presented in section I.
Packaging unit : 20 pieces .
Military designation
M3950/16
M83731/24
APEM www.apem.com
M3950/16 & M83731/24
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QP
PL
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g Ø
Ø 1
11
1,
,9
9 (
(1
15
5/
/3
32
2)
)
FLUORESCENT TIP
Blank None
0.38 White fluorescent tip.
Becomes luminous when submitted to ultra-violet rays.
Standard lever Locking lever
LEVERS / LOCKING LEVERS
Locking levers
Levers
Standard (leave blank)
-12
Short lever
Sealing boots : see section H.
Security caps : see section I.
-1V
1 locked position (function 6)
-2V
2 locked positions (function 6)
-3V
3 locked positions (functions 9 and 4)
Flat
Solder lug terminals - three pole
I II III
M3950/1616 ON - ON
M3950/1619 ON OFF ON
M3950/1617 MOM OFF MOM
M3950/1618 ON OFF MOM
Flat
Terminations
• Solder lug or straight PC terminals
