B255BXBPLM-24D

## **255 Series - Industrial Latching Relays** 3PDT or 4PST, 10 Amp Nuclear Grade Available 

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 120VAC Resistive 240VAC Resistive 28VDC Resistive Minimum current 50 mA Contact Resistance, Initial 

Up to 3PDT or 4PST Silver Alloy Gold Diffused 1/6 hp, 10 Amp 1/3 hp, 5 Amp 10 Amp 

50 milliohms max @ 6VDC 

## _**Coil:**_ 

Coils Available AC and DC Nominal Coil Power 4.9VA    1.8W Input Voltage Tolerance - AC 85% to 110% of nominal Input Voltage Tolerance - DC 80% to 110% of nominal Drop out voltage 10% of nominal Duty Continuous _**Timing:**_ Operate Time (max) 25mS Release Time (max) 20mS _**Dielectric Strength:**_ Across Open Contacts 1500Vrms Between Mutually Insulated 1500Vrms Points 100 Megohms min @ 500VDC Insulation Resistance **Temperature:** -20 to 60°C (-4 to 140°F) Operating -40 to 105°C (-40 to 221°F) Storage _**Life Expectancy:**_ 100,000 Electrical (full load operations) 10,000,000 Mechanical (no load operations) 

**255 Wire Diagram (Top View)** 

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6 5 4 3 2 1<br>cece ce cc 7 8 ece 9 10 11 e 12<br>255XBX (DPDT)<br>255ABX (1 N.O + DPDT)<br>Reset<br>6 5 4 3 2 1 6 5 4 3 2 1<br>?. oe ° @ ee e e<br>7 8 9 10 11 12 7 8 9 10 11 12<br>Operate Reset Operate Reset<br>Reset<br>Operate Operate<br>**----- End of picture text -----**<br>


**255XCX (3PDT)** 

**255BXB (2 N.O. + 2 N.C.)** 

_**Miscellaneous:**_ Any Mounting Position Clear Polycarbonate Mating Socket 8.5oz (241 grams) Enclosure 12 PIN: 27390 (D) Weight 14 PIN: 33377 (D) (D) is option for DIN Rail Mount - Not UL listed 

**1/5** 

May 2019 

**www.struthers** ~~**-**~~ **dunn.com (843) 346** ~~**-**~~ **4427** 

**Latching / Sequencing Relays** 10 Amp 

## Series 255 Part Numbering System 

255                       XBX *69  P L  M  V1 33 N      120VAC **Series Part Number: Contact Type :** Standard 10 Amp  Gold Diffused Silver Alloy (minimum 50 mA) Bifurcated – 5 Amp Gold Diffused Silver Alloy (Ideal for less than 50 mA) **Contact Combination: Standard – 12 Pin Plug (others available) XBX (DPDT) (2 Form C** ) **XCX (3PDT) (3 Form C** ) AAX (SPST- NO & SPDT) (1 Form A & 1 Form C) AAB (SPST & SPDT & DPST-NC) (1 Form A & 1 Form C & 2 Form B) ABX (SPST- NO & DPDT) (1 Form & 2 Form C) **AXB (SPST- NO & 2PST- NC) (1 Form A & 2 Form B)** AXC (SPST- NO, 3PST- NC) (1 Form A, 3 Form, B BAA (DPST & SPDT & SPST-NC) (2 Form A & 1 Form C & 1 Form B) **BXB (DPST- N0 & DPST- NC) (2 Form A & 2 Form B** ) XBA (DPDT & SPST- NC)  (2 Form C & 1 Form B) CXA (3PST- NO & SPST- NC) (3 Form A & 1 Form B) DXX (4PST- NO) (4 Form A) XXD (4PST- NC)  (4 Form B) HXX (SPST- NO-DM) (Form X) XXH (SPST- NC-DB) (1 Form Y) HXH (SPST-NO-DM & SPST-NC-DB) (1 Form X & 1 Form Y) JXX (DPST- NO-DM) (2 Form X) XXJ (DPST- NC-DB) ( 2 Form Y) XHX (SPDT- DM-DB) (1 Form Z) _**Other special options available – 14 Pin, special adjustments, special wiring, octal plug**_ **Enclosure:** Lexan Finger Protective Cover – P ( Standard) _**Other special options available – Gasket sealed cover, colored covers**_ **Other Option Codes:** Blowout Magnet – Code **69    *NOTE: 69 places before “P” in part # order** LED indicator – Code L     ( **Special optional LED available** ) Manual Actuator – Code M ( **Special option available - Locking Manual Actuator** ) Coil Suppression Diode  – Code V     ( **VDC version only** ) AC Coil - Arc Suppression Network – V1 **(VAC only) (Not UL Listed)** Bifurcated Contacts – Code 33    ( **5 Amp@120VAC   UL - Rated** ) _(_ _**Special option - mixed bifurcated and standard contacts** )_ Cover Gasket - Code N _**Other special options available: Arc Suppressor (back EMF) Network across coil,**_ **Coil Voltage – Class B, 105C Insulation system VAC –** 6, 12, 24, 120, 208, 220, 240 **VDC -** 6, 12, 24, 48, 110/125, 250 _Other special options available: special coil resistances & voltages, Arc Suppressor (back EMF) Network across coil_ _**As of 05-15-2019**_ 

**2/5** 

May 2019 

**www.struthers** ~~**-**~~ **dunn.com (843) 346** ~~**-**~~ **4427** 

**Latching / Sequencing Relays** 10 Amp 

## **UL Contact Load Ratings** 

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||||||
|---|---|---|---|---|
|Contact|Load|Load|
|Current / HP|Type of Load|
|Configuration|Voltage|Frequency|
|10 Amp|120 VAC|50/60Hz|Resistive|
|5 Amp|240 VAC|50/60Hz|Resistive|
|All Styles|10 Amp|28 VDC|DC|Resistive|
|EXCEPT|
|0.5 Amp|125 VDC|DC|Resistive|
|Code 33|
|1/6HP|120 VAC|50/60Hz|Motor|
|1/3HP|240 VAC|50/60Hz|Motor|
|5 Amp|120 VAC|50/60Hz|General Purpose|
|Code 33|2.5 Amp|240 VAC|50/60Hz|General Purpose|

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## **Additional UL Ratings for code “69” relays incorporating a blowout magnet.** 

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||||||
|---|---|---|---|---|
|Contact|
|Load|Load|
|Configuration|Current / HP|Type of Load|
|Voltage|Frequency|
|All Styles|3 Amp|125 VDC|DC|Resistive|
|EXCEPT|1Amp|250 VDC|DC|Resistive|
|Code 33|

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**See the next page for additional Contact Ratings** 

**Use Code “33” for bifurcated contacts when switching low level current below 50mA.** 

## **Coil Specifications** 

## **Outline Dimensions** 

Dimensions Shown in inches & (millimeters) 

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||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
|*AC Coil, 50/60HZ|
|Reset coil (3VA)|Operate Coil (5VA)|
|Nominal   Resistance|Coil Power    Resistance    Coil Current|
|voltage     ohms                (mA)|ohms|(mA)|
|±10%|±10%|
|6              6|1000|1.10                5454|
|12            21|571|4.20                2857|
|3.72|
|24            85|282|15.5                527|(94.4)|
|120          2250|53|540                222|MAX|Optional manual|
|240          9110|26|2150|112|actuator|
|4.52|
|Current inrush on all AC coils is less than twice the listed milliam-|(114.8)|
|MAX|
|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)|Locking clip|
|±10%|±10%|
|6              32.1|187|15.5                385|(41.5)|‘7|1.63|=———=s|
|12            120|100|63.5                189|With manual actuator|MAX|
|24            360|67|250                96.0|1.44|
|48            1800|26.7|975                 49.2|[n.]|Without manual actuator(36.7)|6|5|4|3|2|1|
|115/125   8000|14.4|6200|20.0|
|250          24600                 10.2               27777            9.0|2.63|
|(66.8)|
|MAX|

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DC relays, 1.8 Watts (2.5 Watts @ 125VDC) 

**3/5** A 

May 2019 

**www.struthers** ~~**-**~~ **dunn.com (843) 346** ~~**-**~~ **4427** 

## **Latching / Sequencing Relays** 10 Amp 

**4/5** 

May 2019 

## **Advantages of the Series 255 Latching Relay** 

## **Our series 255 is a Mechanical Latching Relay:** 

- Our 255 Latched relay can remain in that state until it is released electrically or by using an optional manual reset button. 

- The 255 has a variety of contact combinations that can be used making it a very versatile relay. 

- Our contacts have a Gold diffused plating for long life and lower contact resistance. 

- Our standard contacts operate at from 50 mA up to 10A depending on the voltage and optional Bifurcated contacts that operate below 50 mA up to 5A. Both types can be used on the same relay as an option. 

- The wiping action of the contact blades and the higher contact pressures used assure that oxidation that can form on ordinary contacts over a period of time are mechanically cleaned with each activation. 

- Duty cycle is continuous. 

- If needed, both coils can be energized at the same time because the operate coil is dominant. Interrupting the voltage to the operate coil will unlatch the relay. 

- 255 has higher and longer reliability and are used a variety of applications from Airport runways to Nuclear plants and airport runways for examples. 

- The 255 Relay functions in sever ambient temperatures. 

## **Also, the 255 is qualified.** 

- IEEE 344 project; 

- Mild EQ aging assessment 

- Justified 1.0E+5 Rads γ 

- supports 40 service life @ 104°F with assumption of AOO of 120°F. 

- Measured coil temperature rise 

- Simulated operation aging 

- Seismic sequence:  resonance search, five (5) OBEs, four (4) SSEs 

- SSE RRS (#1 - #3) peak of ~10g horizontal  and ~7 g vertical; and  ZPA of 1.9g. o SSE #4 was High-g test peak of 15g horizontal and 10g vertical 

Note: The above qualification was done by Framatome. For further information please contact Framatome at www.us.areva-np. com 

**5/5** 

May 2019