# Time Delay Relay, 1 s, 20 s, 3RP Series, SPST-NO, DIN Rail
**URL**: https://novapart.co/products/3RP2574-1NM20/time-delay-relay-1-s-20-3rp-series-spst-no-din
**SKU**: 3RP2574-1NM20
**Manufacturer**: SIEMENS
**Category**: Switches & Relays || Relays || Time Delay Relays - Electromechanical
**Price**: €100.0500
**Stock**: 10+
## Specifications
| Parameter | Value |
|---|---|
| Product Range | SIRIUS 3RP25 Series |
## Datasheet
📄 [Download PDF](https://novapart.co/datasheet/farnell:3533894/)
**3RP2574-1NM20**
**Data sheet**
Timing relay, electronic with star-delta (wye-delta) function 1 NO delayed 1 NO instantaneous 1 time range, 1...20 s 200-240 V AC and 380-440 V AC screw terminal
|Timing relay, electronic with star-delta (wye-delta) function 1 NO delayed 1 NO
instantaneous 1 time range, 1...20 s 200-240 V AC and 380-440 V AC screw
terminal
**product brand name**
SIRIUS
**product designation**
timingrelay
**design of theproduct**
Star-delta(wye-delta)function
**product type designation**
3RP25
**General technical data**
**product featureprotective coating onprinted-circuit board**
No
**product component**
● relayoutput
Yes
● semi-conductor output
No
**product extension required remote control**
No
**product extension optional remote control**
No
**power loss[W] maximum**
2 W
insulation voltage for overvoltage category III according to IEC
60664 with degree ofpollution 3 rated value
500 V
**test voltage for isolation test**
2.5 kV
**degree ofpollution**
3
**surge voltage resistance rated value**
4 000 V
**shock resistance according to IEC 60068-2-27**
11g/ 15 ms
**vibration resistance according to IEC 60068-2-6**
10 ... 55 Hz / 0.35 mm
**mechanical service life(operating cycles) typical**
10 000 000
electrical endurance(operatingcycles)at AC-15 at 230 V typical
100 000
**adjustable time**
1 ... 20 s
**relative setting accuracy relating to full-scale value**
5 %; +/-
**thermal current**
5 A
**recovery time**
150 ms
**reference code according to IEC 81346-2**
K
**relative repeat accuracy**
1 %; +/-
**influence of the surrounding temperature**
1% in the whole temperature range to the set runtime
**power supply influence**
1% in the whole voltage range to the set runtime
**Substance Prohibitance(day/month/year)**
09/12/2014
**SVHC substance name**
Lead CAS-No. 7439-92-1
Lead monoxide (lead oxide) CAS-No. 1317-36-8
2-methyl-1-(4-methylthiophenyl)-2-morpholinopropan-1-one CAS-No. 71868-
10-5
Melamine CAS-No. 108-78-1
6,6'-di-tert-butyl-2,2'-methylenedi-p-cresol CAS-No. 119-47-1
**Net Weight**
0.159 kg
**Control circuit/ Control**
**type of voltage of the control supply voltage**
AC
**control supply voltage at AC**
● at 50 Hz rated value
200 ... 240 V|Timing relay, electronic with star-delta (wye-delta) function 1 NO delayed 1 NO
instantaneous 1 time range, 1...20 s 200-240 V AC and 380-440 V AC screw
terminal||
|---|---|---|
||SIRIUS||
||timingrelay||
||Star-delta(wye-delta)function||
||3RP25||
||AC||
||||
||200 ... 240 V||
Subject to change without notice © Copyright Siemens
3RP25741NM20 Page 1/6
6/1/2026
|● at 60 Hz rated value|200 ... 240 V|
|---|---|
|**control supply voltage 1 at AC**||
|● at 50 Hz|200 ... 240 V|
|● at 60 Hz|200 ... 240 V|
|**control supply voltage 2 at AC**||
|● at 50 Hz|380 ... 440 V|
|● at 60 Hz|380 ... 440 V|
|**control supply voltage frequency 1**|50 ... 60 Hz|
|**operating range factor control supply voltage rated value at**
**AC at 50 Hz**||
|● initial value|0.85|
|● full-scale value|1.1|
|**operating range factor control supply voltage rated value at**
**AC at 60 Hz**||
|● initial value|0.85|
|● full-scale value|1.1|
|**inrush currentpeak**||
|● at 240 V|1 A|
|● at 440 V|1.5 A|
|**duration of inrush currentpeak**||
|● at 240 V|0.2 ms|
|● at 440 V|0.1 ms|
|**Switching Function**||
|**switching function**||
|● ON-delay|No|
|● ON-delay/instantaneous contact|No|
|●passingmake contact|No|
|●passingmake contact/instantaneous contact|No|
|● OFF delay|No|
|**switching function**||
|● flashingsymmetricallywith interval start/instantaneous|No|
|● flashingsymmetricallywith interval start|No|
|● flashingsymmetricallywithpulse start/instantaneous|No|
|● flashingsymmetricallywithpulse start|No|
|● flashingasymmetricallywith interval start|No|
|● flashingasymmetricallywithpulse start|No|
|**switching function**||
|● star-delta circuit with delaytime|No|
|● star-delta circuit|Yes|
|**switching function with control signal**||
|● additive ON-delay|No|
|●passingbreak contact|No|
|●passingbreak contact/instantaneous|No|
|● OFF delay|No|
|● OFF delay/instantaneous|No|
|●pulse delayed|No|
|●pulse delayed/instantaneous|No|
|●pulse-shaping|No|
|●pulse-shaping/instantaneous|No|
|● additive ON-delay/instantaneous|No|
|● ON-delay/OFF-delay/instantaneous|No|
|●passingmake contact|No|
|●passingmake contact/instantaneous contact|No|
|**switching function of interval relay with control signal**||
|● retrotriggerable with deactivated control
signal/instantaneous contact|No|
|● retrotriggerable with switched-on control signal|No|
|● retrotriggerable with switched-on control
signal/instantaneous contact|No|
|● retriggerable with deactivated control signal|No|
Subject to change without notice © Copyright Siemens
3RP25741NM20 Page 2/6
6/1/2026
||**Short-circuit protection**|**Short-circuit protection**||
|---|---|---|---|
||design of the fuse link for short-circuit protection of the auxiliary
switch required|fuse gL/gG: 4 A||
||**Auxiliary circuit**|||
||**material of switching contacts**|AgSnO2||
||**number of NC contacts**|||
||● delayed switching|0||
||● instantaneous contact|0||
||**number of NO contacts**|||
||● delayed switching|1||
||● instantaneous contact|1||
||**number of CO contacts**|||
||● delayed switching|0||
||● instantaneous contact|0||
||**operational current of auxiliary contacts at AC-15**|||
||● at 24 V|3 A||
||● at 250 V|3 A||
||● at 400 V|3 A||
||**operational current of auxiliary contacts at DC-13**|||
||● at 24 V|1 A||
||● at 125 V|0.2 A||
||● at 250 V|0.1 A||
||**operating frequency with 3RT2 contactor maximum**|5 000 1/h||
||**contact reliability of auxiliary contacts**|one incorrect switching operation of 100 million switching operations (17 V, 5
mA)||
||**contact rating of auxiliary contacts according to UL**|R300 / B300||
||**switching capacity current with inductive load**|0.01 ... 3 A||
||**Inputs/ Outputs**|||
||**product function**|||
||● at the relayoutputs switchover delayed/without delay|No||
||● non-volatile|No||
||**ampacity of the output relay at DC-13**|||
||● at 24 V|1 A||
||● at 125 V|0.2 A||
||**Electromagnetic compatibility**|||
||EMC emitted interference accordingto IEC 61812-1|ambience A(industrial sector)||
||EMC immunityaccordingto IEC 61812-1|corresponds to degree of severity3||
||**conducted interference**|||
||● due to burst accordingto IEC 61000-4-4|2 kV network connection / 1 kV control connection||
||● due to conductor-earth surge accordingto IEC 61000-4-5|2 kV||
||● due to conductor-conductor surge according to IEC
61000-4-5|1 kV||
||**field-based interference according to IEC 61000-4-3**|10 V/m||
||**electrostatic discharge according to IEC 61000-4-2**|4 kV contact discharge / 8 kV air discharge||
||**Safety related data**|||
||categoryaccordingto EN 954-1|none||
||Electrical Safety|||
||**protection class IP on the front according to IEC 60529**|IP20||
||**type of insulation**|Basic insulation||
||**Connections/ Terminals**|||
||**product component removable terminal for auxiliary and**
**control circuit**|Yes||
||**type of electrical connection**|screw terminal||
||● for auxiliaryand control circuit|screw-type terminals||
||**type of connectable conductor cross-sections**|||
||● solid|1x(0.5 ... 4 mm²), 2x(0.5 ... 2.5 mm²)||
||● finelystranded with core endprocessing|1x(0.5 ... 4 mm²), 2x(0.5 ... 1.5 mm²)||
||● for AWG cables solid|1x(20 ... 12), 2x(20 ... 14)||
||**connectable conductor cross-section**|||
||● solid|0.5 ... 4 mm²||
Subject to change without notice © Copyright Siemens
3RP25741NM20 Page 3/6
6/1/2026
|● finelystranded with core endprocessing|● finelystranded with core endprocessing|0.5 ... 4 mm²|
|---|---|---|
|**AWG number as coded connectable conductor cross**
**section**|||
|● solid||20 ... 12|
|**tightening torque**||0.6 ... 0.8 N·m|
|**design of the thread of the connection screw**||M3|
|**Installation/ mounting/ dimensions**
~~a~~|||
|**mounting position**
~~a~~||any
~~a~~|
|**fastening method**||screw and snap-on mountingonto 35 mm DIN rail|
|**height**||100 mm|
|**width**||22.5 mm|
|**depth**||90 mm|
|**required spacing**|||
|● with side-by-side mounting|||
|— forwards||0 mm|
|— backwards||0 mm|
|— upwards||0 mm|
|— downwards||0 mm|
|— at the side||0 mm|
|● forgroundedparts|||
|— forwards||0 mm|
|— backwards||0 mm|
|— upwards||0 mm|
|— at the side||0 mm|
|— downwards||0 mm|
|● for liveparts|||
|— forwards||0 mm|
|— backwards||0 mm|
|— upwards||0 mm|
|— downwards||0 mm|
|— at the side||0 mm|
|**Ambient conditions**
~~a~~|||
|installation altitude at height above sea level maximum
~~a~~||2 000 m
~~a~~|
|**ambient temperature**|||
|● duringoperation||-25 ... +60 °C|
|● duringstorage||-40 ... +85 °C|
|● duringtransport||-40 ... +85 °C|
|relative humidityduringoperation||10 ... 95 %|
|**Approvals Certificates**
~~a~~|||
|**Environment**
~~a~~|**General Product Approval**
~~a~~||
Subject to change without notice © Copyright Siemens
3RP25741NM20 Page 4/6
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**Further information Information on the packaging** https://support.industry.siemens.com/cs/ww/en/view/109813875 **Information for data generation and storage** https://support.industry.siemens.com/cs/ww/en/view/109995012 **Information- and Downloadcenter (Catalogs, Brochures,…)** https://www.siemens.com/ic10 **Industry Mall (Online ordering system)** https://mall.industry.siemens.com/mall/en/en/Catalog/product?mlfb=3RP2574-1NM20 **Cax online generator** https://support.automation.siemens.com/WW/CAXorder/default.aspx?lang=en&mlfb=3RP2574-1NM20 **Service&Support (Manuals, Certificates, Characteristics, FAQs,...)** https://support.industry.siemens.com/cs/ww/en/ps/3RP2574-1NM20 **Image database (product images, 2D dimension drawings, 3D models, device circuit diagrams, EPLAN macros, ...)** https://www.automation.siemens.com/bilddb/cax_de.aspx?mlfb=3RP2574-1NM20&lang=en
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## Links
- [View this product on Novapart](https://novapart.co/products/3RP2574-1NM20/time-delay-relay-1-s-20-3rp-series-spst-no-din)
- [Request a quote for this part](https://novapart.co/quote/)
- [Supplier page](https://es.farnell.com/siemens/3rp2574-1nm20/time-delay-electromechanical/dp/3533894)
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