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Siemens 3SK1121-1CB42 Safety Relay Basic Unit
Siemens 3SK1121-1CB42 Safety Relay Basic Unit
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Description:
Siemens' SIRIUS 3SK1121-1CB42 Safety Relay Basic Unit is a member of the Advanced series designed for autonomous safety circuits. It delivers four safety-relay outputs: two normally open (NO) instantaneous channels and two NO delayed channels, with a selectable time delay range of 0.5 to 30 seconds to suit different safety function timing. The unit operates from a 24 V DC supply (Us = 24 V DC) and uses screw-terminal connections, with a form factor intended for DIN-rail mounting in control panels. As a Basic Unit within the SIRIUS 3SK1 family, it provides straightforward wiring and reliable safety signaling without external logic modules.
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