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Siemens 3SK1121-1CB42 Time Delay Safety Relay

Siemens 3SK1121-1CB42: Time delay safety relay, 2 NO + 2 NO delayed, 0.5-30s, 24V DC.

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ManufacturerSiemens

Part number3SK1121-1CB42

Series SIRIUS

Type Advanced Unit with Time Delay

Enabling Circuits 2 NO Instantaneous, 2 NO Delayed

Time Delay 0.5-30 s

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Extended time delay (0.5-30s) 2 instantaneous NO contacts 2 delayed NO contacts 24 V DC operation Screw terminals SIRIUS advanced series

Product description

The Siemens 3SK1121-1CB42 is an advanced safety relay within the SIRIUS range, equipped with a wider adjustable time delay function. This 24 V DC unit provides two normally open (NO) instantaneous contacts and two normally open (NO) delayed contacts. The time delay is adjustable from 0.5 to 30 seconds, offering greater flexibility for applications requiring longer delays. It features standard screw terminals for secure electrical connections.

This time-delay safety relay is suitable for applications demanding a significant delay before machine restart or the completion of a safety sequence, such as in automated storage systems, material handling equipment, or processes requiring extended cooling or settling times. Its advanced features support complex safety strategies in diverse industrial settings.

Stanlo Automation, a veteran-owned supplier of surplus industrial automation parts, offers the Siemens 3SK1121-1CB42. We are dedicated to providing reliable and cost-effective solutions for your automation and safety needs. Choose Stanlo Automation for your critical industrial components.

Technical specifications

Series	SIRIUS
Type	Advanced Unit with Time Delay
Enabling Circuits	2 NO Instantaneous, 2 NO Delayed
Time Delay	0.5-30 s
Supply Voltage	24 V DC
Terminals	Screw

Common applications

Automated storage systems

Long process delays

Material handling timeouts

Hazardous motion suppression

Industrial automation timing

Compatible systems

SIRIUS control systems Safety devices requiring timed intervention Advanced PLC programming Complex automated machinery

Also known as

Siemens SIRIUS Long Time Delay Relay 3SK11 Delayed Safety Module Siemens 24V DC Process Timer Relay

Replaces / compatible with

Ideal for applications requiring longer timed safety outputs, this relay can replace configurations using multiple basic safety relays and external timers or older Siemens timed safety relays with similar delay ranges.

Technical note

Expert tip

The adjustable time delay range makes this relay versatile for applications needing precise timing control for safety interlocks or sequenced operations.

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Frequently asked questions

What types of industrial processes benefit from the longer time delay of the 3SK1121-1CB42?

Industrial processes that benefit from the longer 0.5-30 second time delay of the Siemens 3SK1121-1CB42 include those where components need time to cool down, settle, or move to a safe position after a safety signal is removed. Examples include automated assembly lines where parts need to clear a station, or machinery where cooling periods are necessary before restart.