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Siemens 3SK1211-2BW20 — Safety Relays

Siemens 3SK1211-2BW20 SIRIUS Safety Relay, 5 A, 110-240 V

MPN3SK1211-2BW20
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Siemens SIRIUS 3SK1211-2BW20 safety relay output expansion, 110-240 V AC/DC supply, 5 A contact rating, push-in spring terminals, 22.5 mm width.

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

Specifications

3SK1211-2BW20 — Identification
ParameterValue
Product brand nameSIRIUS
Product designationOutput expansion
Product design / configurationRelay enabling circuits
3SK1211-2BW20 — Safety ratings
ParameterValue
Category (EN ISO 13849-1)4
PFHd, high demand rate (EN 62061)1.7E-9 1/h
Hardware fault tolerance (IEC 61508)1
Stop category (EN 60204-1)0
Safety device type (IEC 61508-2)Type A
3SK1211-2BW20 — Outputs & contacts
ParameterValue
Safety-related instantaneous contacts4
Safety-related delayed contacts0
Signaling-function instantaneous contacts0
Max. operating frequency360 1/h
3SK1211-2BW20 — 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
3SK1211-2BW20 — Connection
ParameterValue
Type of electrical connectionspring-loaded terminal (push-in)
Conductor cross-section, solid1x (20 ... 16), 2x (20 ... 16)
Conductor cross-section, stranded1x (20 ... 16), 2x (20 ... 16)
Conductor cross-section, with ferrule1x (0.5 ... 1.0 mm²), 2x (0.5 ... 1.0 mm²)
Plug-in socket connectionNo
3SK1211-2BW20 — Mechanical
ParameterValue
Touch protection against electric shockfinger-safe
Fastening methodscrew and snap-on mounting
Mounting positionany
Width22.5 mm
Height100 mm
Depth121.6 mm
3SK1211-2BW20 — 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)900 ... 1 060 hPa
EMC / emitted interference standardsIEC 60947-5-1, Class A
3SK1211-2BW20 — Approvals
ParameterValue
UL approvalYes

Product details

The Siemens 3SK1211-2BW20 is a SIRIUS safety relay output expansion module designed for relay enabling circuits in safety-related applications. It provides 5 A switching capability at 24 V, 115 V, or 230 V, with a total current maximum of 12 A. The supply is rated 110-240 V AC/DC, 50/60 Hz.

Housed in a 22.5 mm wide enclosure with screw and snap-on mounting for DIN rail. Depth is 121.6 mm, height 100 mm. With core end processing, accepts 1x (0.5-1.0 mm²) or 2x (0.5-1.0 mm²); without, 1x (0.5-1.5 mm²) or 2x (0.5-1.5 mm²). Mounting position is any.

Shock resistance 10g / 11 ms. Pollution degree 3, overvoltage category 3. EMC emitted interference per IEC 60947-5-1, Class A. UL approved. Insulation voltage rated 300 V. Maximum power loss 2 W.

Frequently asked questions

Where can I buy 3SK1211-2BW20 and get a price?

The 3SK1211-2BW20 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.

What are the key ratings of 3SK1211-2BW20?

Contact rating is 5 A at 24 V, 115 V, or 230 V. Supply is 110-240 V AC/DC. Total current maximum is 12 A. Power loss is 2 W maximum.

What compliance documentation does Siemens provide for 3SK1211-2BW20?

The part carries UL approval and meets EMC emitted interference Class A per IEC 60947-5-1. Pollution degree 3 and overvoltage category 3 apply.

MPN
3SK1211-2BW20