2700357

Safety Relay, 24 VDC, SPST-NO, SPST-NC, PSRmini Series, DIN Rail, 5 A, Screw

⚠️ Reference pricing provided. In case of supply shortages, we will connect you with our trusted procurement partners to ensure your project's continuity.

Manufacturer: PHOENIX CONTACT
Product type: Safety Relays
SVHC: Lead (04-Feb-2026)
IP Rating: IP20, IP54
Coil Voltage: 24VDC
Product Range: PSRmini Series
Relay Mounting: DIN Rail
Contact Current: 5A
Relay Terminals: Screw
Contact Material: Silver Tin Oxide, Silver Copper Nickel
Contact Configuration: SPST-NO, SPST-NC
Contact Voltage AC Nom: 250V
Contact Voltage DC Nom: 250V

Delivery and price
Units per pack	1
Price	121.18 €
Current stock	10+
Lead time	30 days

Datasheet

https://www.phoenixcontact.com/us/products/2700357 

## Coupling relay - PSR-PS21-1NO-1NC-24DC-SC - 2700357 

Please be informed that the data shown in this PDF Document is generated from our Online Catalog. Please find the complete data in the user's documentation. Our General Terms of Use for Downloads are valid 

(http://phoenixcontact.com/download) 

Coupling relay for SIL 2 high- and low-demand applications, couples digital output signals to the I/O, 1 enabling current path, 1 confirmation current path, 1 digital signal output, safe state off applications, test pulse filter, fixed screw terminal block 

## Why buy this product 

Up to SIL 2 according to IEC 61508 

Forcibly guided contacts according to EN 50205 

Easy proof test according to IEC 61508 thanks to integrated signal contact 

Approved for Class I, Zone 2 applications 

Low housing width of just 6.8 mm 

Long service life thanks to filtering of controller test pulses 

1 enabling current path, 1 digital signal output, 1 diagnostic current path 

Couples digital output signals from failsafe controllers to I/O devices (valves, etc.) for electrical isolation and power adaptation 

## Key Commercial Data 

|Packing unit|1 STK|
|---|---|
|Weight per Piece (excluding packing)|120.000 g|
|Custom tariff number|85364900|
|Country of origin|Germany|



## Technical data 

## Note 

EMC: class A product, see manufacturer's declaration in the download Utilization restriction area Dimensions Width 6.8 mm ~~|~~ 09/08/2016   Page 1 / 6 

https://www.phoenixcontact.com/us/products/2700357 

## Coupling relay - PSR-PS21-1NO-1NC-24DC-SC - 2700357 

## Technical data 

## Dimensions 

|Height|93.1 mm|
|---|---|
|Depth|102.5 mm|
|Ambient conditions||
|Ambient temperature (operation)<br>-40 °C ... 65 °C (observe derating)<br>Ambient temperature (storage/transport)<br>-40 °C ... 85 °C<br>Max. permissible relative humidity (operation)<br>75 % (on average, 85% infrequently, non-condensing)<br>Max. permissible humidity (storage/transport)<br>75 % (on average, 85% infrequently, non-condensing)<br>Shock<br>15g<br>Vibration (operation)<br>2g<br>Maximum altitude<br>≤ 2000 m (Above sea level)<br>~~7~~||
|Input data||
|Rated control circuit supply voltage US|24 V DC -15 % / +10 %|
|Power consumption at US|typ. 1.08 W|
|Rated control supply current IS|typ. 45 mA|
|Inrush current|400 mA (Δt < 10 µs at Us)|
|Typ. starting time with Us|< 100 ms (when controlled via A1)|
|Typical release time|< 35 ms (when controlled via A1)|
|Recovery time|500 ms|
|Status display|2 x green LEDs|
|Maximum switching frequency|1 Hz|
|Filter time|max. 2 ms (at A1-A2; test pulse width)|
||≥ 100 ms (at A1-A2; test pulse rate)|
|Output data||
|Contact type<br>1 enabling current path<br>1 confirmation current path<br>Contact material<br>AgSnO2(enabling current path)<br>AgCuNi, + Au (confirmation current path)<br>Minimum switching voltage<br>10 V AC/DC (N/O contact)<br>20.4 V DC (N/C contact)<br>Maximum switching voltage<br>250 V AC/DC (N/O contact)<br>26.4 V DC (N/C contact)<br>Limiting continuous current<br>6 A (N/O contact, pay attention to the derating)<br>100 mA (N/C contact)<br>Inrush current, minimum<br>3 mA (N/O contact)<br>1 mA (N/C contact)<br>Maximum inrush current<br>6 A (N/O contact)<br>~~=~~||
||09/08/2016   Page 2 / 6|



https://www.phoenixcontact.com/us/products/2700357 

## Coupling relay - PSR-PS21-1NO-1NC-24DC-SC - 2700357 

|Technical data||
|---|---|
|Output data||
|100 mA (N/C contact)<br>Sq. Total current<br>36 A<br>2(observe derating)<br>Switching capacity<br>min. 30 mW<br>Output fuse<br>6 A gL/gG (N/O contact)<br>4 A gL/gG (for low-demand applications)<br>150 mA fast blow (Confirmation current path)<br>~~—S~~||
|Alarm outputs||
|Number of outputs|1 (digital, PNP)|
|Voltage|22 V DC (UD- 2 V)|
|Current|max. 100 mA|
|Maximum inrush current|500 mA (Δt = 1 ms at Us)|
|Short-circuit protection|no|
|Output fuse|150 mA fast blow (signal output)|
|General||
|Relay type<br>Electromechanical relay with forcibly guided contacts in accordance with<br>IEC/EN 61810-3 (EN 50205)<br>Mechanical service life<br>10 x 10<br>6cycles<br>Nominal operating mode<br>100% operating factor<br>Net weight<br>118.6 g<br>Mounting type<br>DIN rail mounting<br>Assembly instructions<br>See derating curve<br>Mounting position<br>vertical, horizontal, with front of module upward<br>Degree of protection<br>IP20<br>Min. degree of protection of inst. location<br>IP54<br>Control<br>single-channel<br>Housing material<br>PBT<br>Housing color<br>yellow<br>~~sw~~||
|Connection data||
|Connection method<br>Screw connection<br>pluggable<br>no<br>Conductor cross section solid min.<br>0.2 mm²<br>Conductor cross section solid max.<br>2.5 mm²<br>Conductor cross section flexible min.<br>0.2 mm²<br>Conductor cross section flexible max.<br>2.5 mm²<br>Conductor cross section AWG min.<br>26<br>Conductor cross section AWG max.<br>12<br>~~===~~||
||09/08/2016   Page 3 / 6|



https://www.phoenixcontact.com/us/products/2700357 

## Coupling relay - PSR-PS21-1NO-1NC-24DC-SC - 2700357 

## Technical data 

## Connection data 

|Stripping length|12 mm|
|---|---|
|Screw thread|M3|



## Safety-related characteristic data 

|Connection data<br>Stripping length<br>Screw thread<br>Safety-related characteristic data|12 mm<br>M3|
|---|---|
|Stop category|0|
|Designation|IEC 61508 - High demand|
|Safety Integrity Level (SIL)|2 (< 15% of the overall SIL)|
|Designation|IEC 61508 - Low demand|
|Safety Integrity Level (SIL)|2 (< 15% of the overall SIL)|
|Designation|EN 50156|
|Safety Integrity Level (SIL)|2|



## Standards and Regulations 

|Designation<br>Safety Integrity Level (SIL)<br>Designation<br>Safety Integrity Level (SIL)<br>Standards and Regulations|IEC 61508 - Low demand<br>2 (< 15% of the overall SIL)<br>EN 50156<br>2|
|---|---|
|Shock|15g|
|Designation|Air clearances and creepage distances between the power circuits|
|Standards/regulations|DIN EN 50178, EN 60079-15|
|Rated insulation voltage|250 V AC|
|Rated surge voltage/insulation|Safe isolation, 6 kV reinforced insulation from control circuit, start circuit,<br>confirmation current path, signal output to the enabling current path; 4 kV/<br>basic insulation between all current paths and housing|
|Degree of pollution|2|
|Overvoltage category|III|
|Vibration (operation)|2g|
|Conformance|CE-compliant|
|UL, USA/Canada|cULus|
||Class I, Zone 2, AEx nA nC IIC T4 / Ex nA nC IIC Gc T4 X|
|GL|C, EMC2|



## Drawings 

09/08/2016   Page 4 / 6 

https://www.phoenixcontact.com/us/products/2700357 

## Coupling relay - PSR-PS21-1NO-1NC-24DC-SC - 2700357 

**==> picture [423 x 169] intentionally omitted <==**

**----- Start of picture text -----**<br>
Block diagram Circuit diagram<br>A1 21 13<br>SIS<br>DC 90%<br>PSR-PS21 ERR DO DO DI<br>PWR K1 K1 L 24V<br>DGN<br>24V DC<br>N E | Al<br>A2 M1 22 14 A1 13 (  )21<br>PSR-PS21<br>A2 14 (  )22 (  ) M1 K1<br>M<br>K1<br>ET M t<br>(N)<br>**----- End of picture text -----**<br>


## Classifications 

## eCl@ss 

|eCl@ss||
|---|---|
|eCl@ss 5.1|27371901|
|eCl@ss 6.0|27371819|
|eCl@ss 8.0|27371819|
|eCl@ss 9.0|27371819|
|ETIM<br>ETIM 5.0<br>EC001449<br>Approvals<br>~~|~~||



## Approvals 

## Approvals 

UL Listed / cUL Listed / EAC / GL / Functional Safety / cULus Listed 

Ex Approvals 

## Approval details 

UL Listed http://database.ul.com/cgi-bin/XYV/template/LISEXT/1FRAME/index.htm FILE E 140324 

09/08/2016   Page 5 / 6 

https://www.phoenixcontact.com/us/products/2700357 

## Coupling relay - PSR-PS21-1NO-1NC-24DC-SC - 2700357 

Approvals 

cUL Listed http://database.ul.com/cgi-bin/XYV/template/LISEXT/1FRAME/index.htm FILE E 140324 

EAC   7500651.22.01.00244 ~~CT~~ 

GL  http://www.gl-group.com/newbuilding/approvals/index.html 11253-14 HH ~~PT~~ 

Functional Safety   44-780-13755203 ~~PT~~ 

cULus Listed 

Phoenix Contact 2016 © - all rights reserved http://www.phoenixcontact.com 

09/08/2016   Page 6 / 6

Updated at April 29, 2026

Phoenix Contact is a global leader in industrial connection technology, automation systems, and electronic interface solutions. With decades of engineering heritage originating in Germany, the company develops robust components designed to ensure reliable power, data, and signal transmission across demanding manufacturing and industrial environments. The cornerstone of the Phoenix Contact portfolio is its industry-leading selection of connection technologies. The range features an exceptional variety of terminal blocks, including pluggable headers and sockets, highly reliable wire-to-board solutions, and versatile DIN rail terminal blocks. These foundational connectivity components are supported by a comprehensive ecosystem of power distribution blocks, interface modules, marking systems, and accessories engineered for seamless control cabinet wiring. Beyond physical connectivity, Phoenix Contact provides critical components for advanced automation, control, and system protection. The wider offering encompasses a broad spectrum of process controllers, high-efficiency AC/DC converters, and a comprehensive suite of power, safety, and solid-state relays. From precision signal converters and electronic circuit breakers to fiber optic cable assemblies, Phoenix Contact equips engineers with the high-performance technologies required to build secure, highly efficient, and future-ready industrial systems.

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