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Siemens 3SK1121-1CB41 Time Delay Safety Relay

Siemens 3SK1121-1CB41: Time delay safety relay, 2 NO + 2 NO delayed, 0.05-3s, 24V DC.

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ManufacturerSiemens

Part number3SK1121-1CB41

Series SIRIUS

Type Advanced Unit with Time Delay

Enabling Circuits 2 NO Instantaneous, 2 NO Delayed

Time Delay 0.05-3 s

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Integrated time delay (0.05-3s) 2 instantaneous NO contacts 2 delayed NO contacts 24 V DC operation Screw terminals SIRIUS advanced series

Product description

The Siemens 3SK1121-1CB41 is an advanced safety relay from the SIRIUS series, featuring integrated time delay functionality. Designed for 24 V DC operation, this unit offers two normally open (NO) instantaneous contacts and two normally open (NO) delayed contacts, with adjustable time delay ranging from 0.05 to 3 seconds. It utilizes screw terminals for secure and reliable electrical connections.

This time-delay safety relay is ideal for applications requiring a controlled delay before machine restart or hazardous function deactivation, such as in elevator control, material handling, or processes where components need time to stop safely. It meets advanced safety requirements across industries like automotive, logistics, and processing.

Stanlo Automation, a veteran-owned surplus parts distributor, offers the Siemens 3SK1121-1CB41. We specialize in providing high-quality industrial automation components to keep your operations running efficiently and safely. Trust Stanlo Automation for your specialized safety relay needs.

Technical specifications

Series	SIRIUS
Type	Advanced Unit with Time Delay
Enabling Circuits	2 NO Instantaneous, 2 NO Delayed
Time Delay	0.05-3 s
Supply Voltage	24 V DC
Terminals	Screw

Common applications

Controlled machine restart

Elevator safety

Conveyor system delays

Process control timing

Hazardous motion deactivation

Compatible systems

SIRIUS control systems Safety devices requiring timed response PLC systems with specific timing needs Advanced machine control panels

Also known as

Siemens SIRIUS Time Delay Safety Relay 3SK11 Advanced Delay Relay Siemens 24V DC Safety Timer Relay

Replaces / compatible with

Suitable for applications needing a timed safety output, replacing external timers combined with basic safety relays, or upgrading existing safety circuits requiring delayed actuation.

Technical note

Expert tip

Ensure the selected time delay is appropriate for the specific machine application to guarantee safe stopping distances and controlled restart procedures.

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Frequently asked questions

How is the time delay adjusted on the Siemens 3SK1121-1CB41 safety relay?

The time delay on the Siemens 3SK1121-1CB41 is typically adjusted using potentiometers or setting dials directly on the front of the relay. These controls allow the user to precisely set the delay duration within the specified range of 0.05 to 3 seconds.