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2904950
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 | 129.63 € |
| Current stock | 10+ |
| Lead time | 30 days |
Datasheet
https://www.phoenixcontact.com/pi/products/2904950 ## Safety relays - PSR-MS20-1NO-1DO-24DC-SC - 2904950 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 emergency stop and safety doors up to SILCL 1, Cat. 1, PL c, depending on the application up to SILCL 3, Cat. 4, PL e, 1-channel operation, automatic start, 1 enabling current path, US = 24 V DC, fixed screw terminal block ## Your advantages - Up to Cat. 1/PL c according to ISO 13849-1, SILCL 1 according to IEC 62061 - Depending on the application, 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 - Single-channel control - 1 enabling current path, 1 digital signal output - Automatic activation Key Commercial Data ~~a~~ Packing unit 1 pc GTIN 4 1046356°904988 ~~eT~~ GTIN 4046356904988 ~~a~~ 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| |Ambient conditions|| |Ambient temperature (operation)|-40 °C ... 60 °C (observe derating)| |Ambient temperature (storage/transport)|-40 °C ... 85 °C| ## Dimensions ## Ambient conditions 05/16/2019 Page 1 / 6 https://www.phoenixcontact.com/pi/products/2904950 ## Safety relays - PSR-MS20-1NO-1DO-24DC-SC - 2904950 ## Technical data ## Ambient conditions |Max. permissible relative humidity (operation)|75 % (on average, 85% infrequently, non-condensing)| |---|---| |Max. permissible humidity (storage/transport)|75 % (on average, 85% infrequently, non-condensing)| |Maximum altitude|≤ 2000 m (Above sea level)| |Power supply|| |Rated control circuit supply voltage US<br>24 V DC -15 % / +10 %<br>20.4 V DC ... 26.4 V DC<br>Rated control supply current IS<br>typ. 42 mA<br>Power consumption at US<br>typ. 1 W<br>Inrush current<br>4.5 A (Δt < 120 µs at Us)<br>Filter time<br>1 ms (at A1 in the event of voltage dips at Us)<br>Protective circuit<br>Surge protection Suppressor diode<br>Protection against polarity reversal for rated control circuit supply voltage<br>~~—~~|| |Digital inputs|| |Input voltage range "0" signal<br>0 V DC ... 5 V DC (for safe Off; at S12)<br>Input current range "0" signal<br>0 mA ... 2 mA (for safe Off; at S12)<br>Inrush current<br>< 20 mA (with Us/Ixto S12)<br>< 10 mA (with Us/Ixat the start circuit)<br>Current consumption<br>< 5 mA (with Us/Ixto S12)<br>< 10 mA (with Us/Ixat the start circuit)<br>Filter time<br>max. 1.5 ms (at S12; test pulse width)<br>min. 7.5 ms (at S12; test pulse rate)<br>Test pulse rate = 5 x Test pulse width<br>Voltage at input/start and feedback circuit<br>24 V DC -15 % / +10 %<br>Max. permissible overall conductor resistance<br>150 Ω<br>~~SS~~|| |Relay outputs: enabling current path|| |Output name<br>Enabling current path<br>Output description<br>safety-related N/O contacts<br>Number of outputs<br>1 (undelayed)<br>Contact type<br>1 enabling current path<br>Contact material<br>AgSnO2<br>Switching voltage<br>min. 12 V AC/DC<br>max. 250 V AC/DC (Observe the load curve)<br>Limiting continuous current<br>6 A (observe derating)<br>Inrush current<br>min. 3 mA<br>max. 6 A<br>Sq. Total current<br>36 A<br>2(observe derating)<br>Switching capacity<br>min. 60 mW<br>Switching frequency<br>max. 0.5 Hz<br>Mechanical service life<br>10x 10<br>6cycles<br>~~__|~~|| ||05/16/2019 Page 2 / 6| https://www.phoenixcontact.com/pi/products/2904950 ## Safety relays - PSR-MS20-1NO-1DO-24DC-SC - 2904950 ## Technical data Relay outputs: enabling current path |Output fuse|6 A gL/gG (N/O contact)| |---|---| ||4 A gL/gG (for low-demand applications)| |Alarm outputs|| |Output description<br>non-safety-related<br>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>~~—~~|| |Times|| |Typical pickup time at US|< 250 ms (when controlled via A1)| |Typical response time at US|< 175 ms| |Typical release time at US|< 20 ms (when controlled via A1 or S12)| |Recovery time|< 500 ms| |General|| |Relay type|Electromechanical relay with forcibly guided contacts in accordance with<br>IEC/EN 61810-3 (EN 50205)| |Nominal operating mode|100% operating factor| |Net weight|69 g| |Mounting position|vertical or horizontal| |Mounting type|DIN rail mounting| |Assembly instructions|See derating curve| |Degree of protection|IP20| |Min. degree of protection of inst. location|IP54| |Housing material|PBT| |Housing color|yellow| |Operating voltage display|1 x green LED| |Status display|2 x green LEDs| |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>~~oe~~|| 05/16/2019 Page 3 / 6 https://www.phoenixcontact.com/pi/products/2904950 ## Safety relays - PSR-MS20-1NO-1DO-24DC-SC - 2904950 Technical data Safety-related characteristic data Stop category 0 Designation IEC 61508 - High demand Safety Integrity Level (SIL) 1 (up to SIL 3 depending on the application) Designation IEC 61508 - Low demand Safety Integrity Level (SIL) 1 (up to SIL 3 depending on the application) Designation EN ISO 13849 Performance level (PL) c (up to PL e depending on the application) Category 1 (up to Cat. 4 depending on the application) Designation EN 62061 Safety Integrity Level Claim Limit (SIL CL) 1 (up to SILCL 3 depending on the application) ~~_=~~ Standards and Regulations Designation Air clearances and creepage distances between the power circuits Standards/regulations DIN EN 50178 Rated insulation voltage 250 V AC 250 V AC Safe isolation, reinforced insulation 6 kV between input circuit and Rated surge voltage/insulation enabling current path Basic insulation 4 kV between all current paths and housing Degree of pollution 2 Overvoltage category III Shock 15g Vibration (operation) 10 Hz ... 150 Hz, 2g Conformance CE-compliant Environmental Product Compliance REACh SVHC Lead 7439-92-1 China RoHS Environmentally Friendly Use Period = 50 For details about hazardous substances go to tab “Downloads”, Category “Manufacturer's declaration” ~~S=~~ Drawings 05/16/2019 Page 4 / 6 https://www.phoenixcontact.com/pi/products/2904950 ## Safety relays - PSR-MS20-1NO-1DO-24DC-SC - 2904950 **==> picture [58 x 9] intentionally omitted <==** **----- Start of picture text -----**<br> Block diagram<br>**----- End of picture text -----**<br> **==> picture [156 x 77] intentionally omitted <==** **----- Start of picture text -----**<br> A1 S11 S12 S35 13<br>PSR-MS20 IN K1<br>PWR K1/K2<br>K2<br>24V DC<br>A2 M1 14<br>**----- End of picture text -----**<br> **==> picture [58 x 9] intentionally omitted <==** **----- Start of picture text -----**<br> Block diagram<br>**----- End of picture text -----**<br> **==> picture [156 x 118] intentionally omitted <==** **----- Start of picture text -----**<br> PSR-MS20<br>A1 S11 S35 13<br>1<br>K1<br>K2<br>K1 K2<br>2 3 4 6 5<br>2<br>A2 S12 M1 14<br>**----- End of picture text -----**<br> Key: 1 = Voltage limitation 2 = Channel 1 3 = Control circuit channel 1 4 = Control circuit signal output 5 = Start channel 1 and 2 6 = Control circuit channel 2 K1, K2 = Force-guided elementary relays ## Application drawing **==> picture [144 x 149] intentionally omitted <==** **----- Start of picture text -----**<br> 24V DC L<br>K1<br>S1<br>K2<br>A1 S35( ) S11(+) S12( ) 13 K1<br>PSR-MS20<br>A2 M1( ) 14 K2<br>M<br>K1<br>K2<br>0V N<br>**----- End of picture text -----**<br> ## Approvals ## Approvals ## Approvals UL Listed / cUL Listed / Functional Safety / EAC / cULus Listed Ex Approvals ## Approval details 05/16/2019 Page 5 / 6 https://www.phoenixcontact.com/pi/products/2904950 ## Safety relays - PSR-MS20-1NO-1DO-24DC-SC - 2904950 Approvals UL Listed http://database.ul.com/cgi-bin/XYV/template/LISEXT/1FRAME/index.htm FILE E 140324 ~~oo~~ cUL Listed http://database.ul.com/cgi-bin/XYV/template/LISEXT/1FRAME/index.htm FILE E 140324 Functional Safety 44-205-13755202 ~~ee~~ RU C- EAC DE.A*30.B.01082 ~~oo~~ cULus Listed ~~———~~ Phoenix Contact 2019 © - all rights reserved http://www.phoenixcontact.com PHOENIX CONTACT GmbH & Co. KG Flachsmarktstr. 8 32825 Blomberg Germany Tel. +49 5235 300 Fax +49 5235 3 41200 http://www.phoenixcontact.com 05/16/2019 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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