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Siemens 3SK1111-1AW20 — Safety Relays

Siemens 3SK1111-1AW20 Safety Relay, 110-240 VAC/DC, SIL 3, 2

MPN3SK1111-1AW20
Active

Siemens SIRIUS 3SK1111-1AW20 safety relay, 110-240 VAC/DC supply, SIL 3, 22.5 mm width, screw and snap-on mounting, 121.6 mm depth.

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

3SK1111-1AW20 — Identification
ParameterValue
Product brand nameSIRIUS
Product designationsafety relays
Product design / configurationRelay enabling circuits
3SK1111-1AW20 — Safety ratings
ParameterValue
Safety integrity level (IEC 61508)3
Category (EN ISO 13849-1)4
PFHd, high demand rate (EN 62061)1.5E-9 1/h
Hardware fault tolerance (IEC 61508)1
Stop category (EN 60204-1)0
Safety device type (IEC 61508-2)Type A
3SK1111-1AW20 — Monitoring & inputs
ParameterValue
Safety switchYes
Magnetically operated switch monitoringNo
Start inputYes
Feedback inputYes
3SK1111-1AW20 — Outputs & contacts
ParameterValue
Safety-related instantaneous contacts3
Safety-related delayed contacts0
Signaling-function instantaneous contacts1
Max. operating frequency360 1/h
3SK1111-1AW20 — Electrical
ParameterValue
Rated insulation voltage300 V
Rated surge voltage withstand4 000 V
Control supply voltage type (AC/DC)AC/DC
Required output short-circuit protection (fuse / MCB)gL/gG: 6A or circuit breaker type A: 3A or circuit breaker type B: 2A or circuit breaker type C: 1A
3SK1111-1AW20 — Connection
ParameterValue
Type of electrical connectionscrew-type terminals
Conductor cross-section, solid1x (20 ... 14), 2x (18 ... 16)
Conductor cross-section, stranded1x (20 ... 16), 2x (20 ... 16)
Conductor cross-section, with ferrule1x (0.5 ... 2.5 mm²), 2x (0.5 ... 1.0 mm²)
Plug-in socket connectionNo
3SK1111-1AW20 — Mechanical
ParameterValue
Touch protection against electric shockfinger-safe
Fastening methodscrew and snap-on mounting
Mounting positionany
Width22.5 mm
Height100 mm
Depth121.6 mm
3SK1111-1AW20 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-40 ... +80 °C
Relative humidity, operating10 ... 95 %
Enclosure protection rating (IP)IP20
Installation altitude, max.4 000 m; Derating, see Product Notification 109792701
Shock resistance10g / 11 ms
Vibration resistance (IEC 60068-2-6)5 ... 500 Hz: 0.75 mm
Air pressure (SN 31205)90 ... 106 kPa
EMC / emitted interference standardsIEC 60947-5-1, Class A

Product details

It operates on a rated supply of 110 to 240 VAC/VDC, with a tolerance band of 0.85 to 1.1 times the rated value at both 50 and 60 Hz and for DC. The relay provides a start input and a feedback input, and includes a safety switch function. It switches up to 1 A at 24 V, 1.5 A at 115 V, and 1.5 A at 230 V, with a total current maximum of 12 A. The unit measures 22.5 mm wide, 100 mm high, and 121.6 mm deep, and mounts via screw or snap-on onto a DIN rail in any position. Shock resistance is 10g for 11 ms. Maximum power loss is 2.5 W. EMC emitted interference meets IEC 60947-5-1 Class A. Wire connection: solid 1x (20-14 AWG) or 2x (18-16 AWG); stranded 1x (20-16 AWG) or 2x (20-16 AWG); with ferrule 1x (0.5-2.5 mm²) or 2x (0.5-1.0 mm²). Typical response time is 200 ms; maximum 300 ms for AC or DC.

The SIL 3 rating means this relay is certified for use in safety circuits up to Performance Level e (EN ISO 13849-1) where a single fault cannot cause loss of the safety function — it's the level most machine-guarding and emergency-stop circuits demand. The screw and snap-on mounting means you can clip it onto the rail or bolt it down in high-vibration spots. The start input and feedback input let you wire a monitored start button and an external contactor feedback loop, which is the typical arrangement for a reset circuit that won't restart the machine automatically after a fault clears.

Frequently asked questions

Where can I buy 3SK1111-1AW20?

This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.

What is the 3SK1111-1AW20 rated voltage and current?

Rated supply is 110 to 240 VAC/VDC. Switching current is 1 A at 24 V, 1.5 A at 115 V, and 1.5 A at 230 V. Total current maximum is 12 A.

What compliance documentation is available for 3SK1111-1AW20?

The relay is designed to IEC 60947-5-1 for EMC (Class A) and carries SIL 3 certification per IEC 61508 and IEC 62061. Standard Siemens documentation includes the declaration of conformity, CE marking, and RoHS/REACH compliance data available on request.

MPN
3SK1111-1AW20