2904957

Safety Relay, 24 VDC, SPST-NO, PSRmini Series, DIN Rail, 6 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: 6A
Relay Terminals: Screw
Contact Material: Silver Tin Oxide
Contact Configuration: SPST-NO
Contact Voltage AC Nom: 250V
Contact Voltage DC Nom: 250V

Delivery and price
Units per pack	1
Price	128.66 €
Current stock	10+
Lead time	30 days

Datasheet

https://www.phoenixcontact.com/us/products/2904957 

## Safety relays - PSR-MS55-1NO-1DO-24DC-SC - 2904957 

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) 

Safety relay for monitoring non-equivalent signal generators up to SILCL 3, Cat. 4, PL e, 2-channel, nonequivalent operation, manual, monitored start, 1 enabling current path, US = 24 V DC, fixed screw terminal block 

## Product Features 

- Up to Cat.4/PL e according to ISO 13849-1, SILCL 3 according to IEC 62061 

- Low housing width of just 6.8 mm 

- Two-channel non-equivalent control 

- 1 enabling current path, 1 digital signal output 

- Manual and monitored activation 

## Key Commercial Data 

|Packing unit|1 pc|
|---|---|
|Weight per Piece (excluding packing)|80.0 g|
|Custom tariff number|85371099|
|Country of origin|Germany|



## Technical data 

## Note 

|Utilization restriction|EMC: class A product, see manufacturer's declaration in the download|
|---|---|
||area|
|Dimensions||
|Width|6.8 mm|
|Height|93.1 mm|
|Depth|102.5 mm|



## Dimensions 

Ambient conditions 

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## Safety relays - PSR-MS55-1NO-1DO-24DC-SC - 2904957 

## Technical data 

## Ambient conditions 

|Ambient conditions||
|---|---|
|Ambient temperature (operation)|-40 °C ... 60 °C (observe derating)|
|Ambient temperature (storage/transport)|-40 °C ... 85 °C|
|Max. permissible relative humidity (operation)|75 % (on average, 85% infrequently, non-condensing)|
|Max. permissible humidity (storage/transport)|75 % (on average, 85% infrequently, non-condensing)|
|Shock|15g|
|Vibration (operation)|10 Hz ...150 Hz, 2g|
|Maximum altitude|max. 2000 m (Above sea level)|
|Input data||
|Rated control circuit supply voltage US|24 V DC -15 % / +10 %|
|Power consumption at US|typ. 1 W|
|Rated control supply current IS|typ. 42 mA|
|Typical inrush current|4.5 A (Δt = 120 µs at Us)|
|Current consumption|< 5 mA (with Us/Ixto S12)|
||< 5 mA (with Us/Ixto S13)|
||< 10 mA (with Us/Ixat the start circuit)|
|Voltage at input/start and feedback circuit|24 V DC -15 % / +10 %|
|Typical response time|< 175 ms|
|Typical release time|< 20 ms (when controlled via A1 or S12 and S13.)|
|Recovery time|< 500 ms|
|Status display|2 x green LEDs|
|Maximum switching frequency|0.5 Hz|
|Max. permissible overall conductor resistance|150 Ω|
|Filter time|1 ms (at A1 in the event of voltage dips at Us)|
||max. 1.5 ms (at S12, S13; test pulse width)|
||min. 7.5 ms (at S12, S13; test pulse rate)|
||Test pulse rate = 5 x Test pulse width|
|Output data||
|Contact type<br>1 enabling current path<br>Contact material<br>AgSnO2<br>Minimum switching voltage<br>12 V AC/DC<br>Maximum switching voltage<br>250 V AC/DC (Observe the load curve)<br>Limiting continuous current<br>6 A (observe derating)<br>Inrush current, minimum<br>3 mA<br>Maximum inrush current<br>6 A<br>Sq. Total current<br>36 A<br>2(observe derating)<br>Switching capacity<br>min. 60 mW<br>~~===~~||



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https://www.phoenixcontact.com/us/products/2904957 

## Safety relays - PSR-MS55-1NO-1DO-24DC-SC - 2904957 

## Technical data 

## Output data 

|Output fuse<br>6 A gL/gG (N/O contact)|
|---|
|4 A gL/gG (for low-demand applications)|
|Alarm outputs|
|Number of outputs<br>1 (digital, PNP)<br>Voltage<br>22 V DC (Us- 2 V)<br>Current<br>max. 100 mA<br>Maximum inrush current<br>500 mA (Δt = 1 ms at Us)<br>Short-circuit protection<br>no<br>~~=>~~|
|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>Net weight<br>69 g<br>Mounting type<br>DIN rail mounting<br>Degree of protection<br>IP20<br>Min. degree of protection of inst. location<br>IP54<br>Mounting position<br>vertical or horizontal<br>Control<br>Two-channel<br>Housing material<br>PBT<br>~~OO~~|
|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>Stripping length<br>12 mm<br>Screw thread<br>M3<br>~~a~~|
|Safety-related characteristic data|
|Stop category<br>0<br>Designation<br>IEC 61508 - High demand<br>Safety Integrity Level (SIL)<br>3<br>Designation<br>IEC 61508 - Low demand<br>Safety Integrity Level (SIL)<br>3<br>~~=>~~|



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## Safety relays - PSR-MS55-1NO-1DO-24DC-SC - 2904957 

## Technical data 

## Safety-related characteristic data 

|Designation|EN ISO 13849|
|---|---|
|Performance level (PL)|e (4 A DC13; 5 A AC15; 8760 switching cycles/year)|
|Category|4|
|Designation|EN 62061|
|Safety Integrity Level Claim Limit (SIL CL)|3|



## Standards and Regulations 

|Performance level (PL)<br>Category<br>Designation<br>Safety Integrity Level Claim Limit (SIL CL)<br>Standards and Regulations|e (4 A DC13; 5 A AC15; 8760 switching cycles/year)<br>4<br>EN 62061<br>3|
|---|---|
|Shock|15g|
|Designation|Air clearances and creepage distances between the power circuits|
|Standards/regulations|DIN EN 50178|
|Rated insulation voltage|250 V AC|
|Rated surge voltage/insulation|Safe isolation, reinforced insulation 6 kV between input circuit and enabling<br>current path<br>Basic insulation 4 kV between all current paths and housing|
|Degree of pollution|2|
|Overvoltage category|III|
|Vibration (operation)|10 Hz ...150 Hz, 2g|
|Conformance|CE-compliant|



## Classifications 

eCl@ss 

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



## Approvals 

## Approvals 

## Approvals 

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

Ex Approvals 

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## Safety relays - PSR-MS55-1NO-1DO-24DC-SC - 2904957 

## Approvals 

Approvals submitted 

## Approval details 

UL Listed 

cUL Listed 

Functional Safety ~~PT~~ 

EAC ~~PT~~ cULus Listed 

## Drawings 

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Block diagram<br>**----- End of picture text -----**<br>


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**----- Start of picture text -----**<br>
A1 S12 S13 S34 13<br>PSR-MS55 IN K1<br>PWR K1/K2<br>K2<br>24V DC<br>A2 M1 14<br>**----- End of picture text -----**<br>


## Block diagram 

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**----- Start of picture text -----**<br>
A1 PSR-MS55 S13 S34 13<br>1<br>2 3<br>K1<br>9 K2<br>K1 K2<br>8<br>4 5 6 7<br>8<br>A2 S12 M1 14<br>**----- End of picture text -----**<br>


Key: 

1 = Input circuit 

- 2 = Voltage limitation 

- 3 = Start circuit 

- 4 = Control circuit channel 1 

- 5 = Control circuit signal output 

- 6 = Control circuit channel 2 

- 7 = Start channel 1 and 2 

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## Safety relays - PSR-MS55-1NO-1DO-24DC-SC - 2904957 

8 = Channel 1 9 = Diagnostics K1, K2 = Force-guided elementary relays 

## Circuit diagram 

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**----- Start of picture text -----**<br>
24V DC L<br>il ll<br>S3<br>S2<br>K1<br>11 12 13 14<br>K2<br>A1 S34(  ) S12(  ) S13(  ) 13 K1<br>PSR-MS55<br>A2 M1(  ) 14 K2<br>M<br>K1<br>K2<br>0V N<br>**----- End of picture text -----**<br>


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

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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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