255 Series - Industrial Latching Relays
3PDT or 4PST, 10 Amp
File No. E13224
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.
GENERAL SPECIFICATIONS (@ 25° C)
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 Time (max)
Release Time (max)
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
255 Wire Diagram
(Top View)
6
5
4
3
2
1
25mS
20mS
Operate
Dielectric Strength:
1500Vrms
Across Open Contacts
1500Vrms
Between Mutally Insulated Points
1000 Megohms min @ 500VDC
Insulation Resistance
Temperature:
Operating
Storage
Life Expectancy:
Electrical (full load operations)
Mechanical (no load operations)
Miscellaneous:
Mounting Position
Mating Socket
Enclosure
Weight
Reset
8
7
9
10
11
12
255XBX (DPDT)
-20 to 60°C (-4 to 140°F)
-40 to 105°C (-40 to 221°F)
Operate
6
5
4
3
2
1
100,000
10,000,000
Reset
8
7
9
10
11
12
Any
27390D
Clear Polycarbonate
11.8oz (300 grams)
6
255ABX (1 N.O + DPDT)
Reset
5
4
3
2
1
6
5
4
3
2
1
Operate
Operate
Reset
8
7
9
10
11
12
7
8
9
10
11
12
255XCX (3PDT)
255BXB (2 N.O. + 2 N.C.)
4/7
www.struthers-dunn.com
(843)
346-4427
Latching / Sequencing Relays
10 - 100 Amp
255 Contact Load Specifications
Load
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
Outline Dimensions
Dimensions Shown in inches & (millimeters)
3.72
(94.4)
4.52
(114.8)
Coil Specifications
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)
*
AC
Optional manual
actuator
12
11
10
9
8
7
1.44
(36.7)
6
5
4
3
2
1
2.63
(66.8)
Ordering Code
Series
255
255
XCX
P
LM-
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)
www.struthers-dunn.com
(843)
346-4427
4/8
Section 4
Analogue and Mixed Signal
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