Siemens SIRIUS 3SK1 Safety Relay 24V dc, Single Channel 4 Safety Contacts

Subtotal (1 unit)*

£202.09

(exc. VAT)

£242.51

(inc. VAT)

Add to Basket
Select or type quantity
In Stock
  • 8 unit(s) ready to ship
  • Plus 14 unit(s) ready to ship from another location
  • Plus 999,999,991 unit(s) shipping from 03 November 2025
Need more? Click ‘Check delivery dates’ to find extra stock and lead times.
Units
Per unit
1 +£202.09

*price indicative

Alternative

This product is not currently available. Here is our alternative recommendation.

RS Stock No.:
784-5800
Mfr. Part No.:
3SK1121-1AB40
Brand:
Siemens
Find similar products by selecting one or more attributes.
Select all

Brand

Siemens

Supply Voltage

24V dc

Number of Channels

1

Safety Contacts

4

Function

Safety Switch

Reset Method

Automatic, Monitored

Range

SIRIUS

Safety Category ISO 13849-1

4

PL ISO 13849-1

e

SIL IEC 61508

3

Terminal Type

Screw

Configurable

Yes

Width

22.5mm

Series

3SK1

Depth

122mm

Performance Level

e

Length

100mm

COO (Country of Origin):
DE

Siemens Safety Relay, 24V DC Supply Voltage, Screw Terminals - SIRIUS 3SK1 Series - 3SK1121-1AB40


Ensure machinery or devices are quickly switched off with this safety relay from Siemens. It’s designed to automate emergency system shutdown in the event of an electrical fault or hazard, protecting both personnel and attached equipment. As the relay is fitted with four safety contacts, you can be sure it will still function should any of its contacts fail. You can easily fit it into awkward or small circuits thanks to its compact dimensions of 22.5 (W) x 100 (L) x 121.7mm (D). To suit your individual requirements, it has two sensor inputs with single or double channel connection options.

• Four LED lights for easy monitoring of your application and operating status
• Automated or manual reset options are available depending on your needs
• Can be used to automate the locking of protective doors in conjunction with a solenoid switch
• Fitted with a potentiometer for setting the delay time for system switch-on

How do I fit this safety relay?


You can install this safety relay securely into your system or onto a machine by way of screw terminals.

Related links