6 5 4 3 2 1
7 8 9
10 11 12
6 5 4 3 2 1
789
10 11 12
255 Series - Industrial Latching Relays
3PDT or 4PST, 10 Amp
GENERAL SPECIFICATIONS (@ 25° C)
Up to 3PDT or 4PST
Silver Alloy Gold Diffused
10 Amp / 5 Amp
10 Amp
100 milliohms max @ 6VDC
AC and DC
5VA 1.8W
85% to 110% of nominal
80% to 110% of nominal
10% of nominal
Continuous
25mS
20mS
1500Vrms
1500Vrms
1000 Megohms min @ 500VDC
-20 to 60°C (-4 to 140°F)
-40 to 105°C (-40 to 221°F)
100,000
10,000,000
Any
27390D
Clear Polycarbonate
11.8oz (300 grams)
Contacts:
Contact Configuration
Contact Material
Contact Rating
120 / 240VAC Resistive
28VDC Resistive
Contact Resistance, Initial
Coil:
Coils Available
Nominal Coil Power
Input Voltage Tolerance - AC
Input Voltage Tolerance - DC
Drop out voltage
Duty
Timing:
Operate T ime (max)
Release T ime (max)
Dielectric Strength:
Across Open Contacts
Between Mutally Insulated Points
Insulation Resistance
Temperature:
Operating
Storage
Life Expectancy:
Electrical (full load operations)
Mechanical (no load operations)
Miscellaneous:
Mounting Position
Mating Socket
Enclosure
Weight
The 255 Series is a two coil latching version of the general purpose type 219 relay. When the
operate coil is momentarily energized, contacts transfer and remain so even after coil power is
removed. The second coil when momentarily energized, provides electrical reset of the contacts.
There is an optional manual reset actuator. All contacts operate from a common armature to prevent
contact overlapping. Coils are rated for continuous duty. Both coils can be energized at the same
time with no damage. The operate coil is dominant.
File No. E13224
255 Wire Diagram
(Top View)
4/7
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(843) 346-4427
(843) 346-4427
Operate
255XBX (DPDT)
Reset
255ABX (1 N.O + DPDT)
Reset
Operate
6 5 4 3 2 1
789
10 11 12
6 5 4 3 2 1
789
10 11 12
255BXB (2 N.O. + 2 N.C.)
255XCX (3PDT)
Operate
Reset
Reset
Operate
Section 4Section 4
Outline Dimensions
Dimensions Shown in inches & (millimeters)
235461
8911 1012 7
2
3
5
4
6
1
8
9
1
1
1
0
1
2
7
3.72
(94.4)
4.52
(114.8)
1.44
(36.7)
2.63
(66.8)
Ordering Code 255 XCX P LM-
Series
255
Contact Arrangement
XBX (DPDT) - (2 form C)
XCX (3PDT) - (3 form C)
ABX (DPDT & 1 N.O. contact)
BXB (DPST - N.O. & DPST - N.C.)
Standard Features
Polycarbonate cover - CODE P
Optional Features
Permanent magnet blowout - CODE 69
Indicator lamp across both coils - CODE L
Manual actuator - CODE M
Bifurcated contacts - CODE 33
Coil Voltage
AC: 6, 12, 24, 120, 240 (Add VAC)
DC: 6, 12, 24, 48, 115-125, 250 (Add VDC)
*AC Coil, 50/60HZ
Reset coil (3VA) Operate Coil (5VA)
Nominal Resistance Coil Current Resistance Coil Current
voltage ohms (mA) ohms (mA)
±10% ±10%
6 6 1000 1.10 5454
12 21 571 4.20 2857
24 85 282 15.5 527
120 2250 53 540 222
240 9110 26 2150 112
Current inrush on all AC coils is less than twice the listed milliam-
peres ratings as shown in the AC coil data table. *Currents shown
in table measured at 60Hz
DC Coil
Reset coil (1.4W) Operate Coil (1.8W)
Nominal Resistance Coil Current Resistance Coil Current
voltage ohms (mA) ohms (mA)
±10% ±10%
6 32.1 187 15.5 385
12 120 100 63.5 189
24 360 67 250 96.0
48 1800 26.7 975 49.2
115/125 8000 14.4 6200 20.0
250 24,600 10.2 27,777 9.0
DC relays, 1.8 Watts (2.5 Watts @ 125VDC)
Coil Specifications
Latching / Sequencing Relays
10 - 100 Amp
4/8
www.struthers-dunn.com
www.struthers-dunn.com
(843) 346-4427
(843) 346-4427
255 Contact Load Specifications
Voltage Resistive Inductive
120VAC 10 Amp 3 Amp
240VAC 5 Amp 1 Amp
24VDC 10 Amp 3 Amp
28VDC 10 Amp 3 Amp
125VDC 0.5 Amp 0.1 Amp
For versions with suffix “69” permanent magnet blowouts
Voltage Resistive Inductive
125VDC (SM) 1.5 Amp 0.5 Amp
125VDC (DM) 4 Amp 1.5 Amp
250VDC (SM) 0.5 Amp 150 mAmp
250VDC (DM) 1.5 Amp 0.5 Amp
Note: SM = Single make
DM = Double make
Optional manual
actuator
Load
