The Siemens 3SK1121-1CB41 is a SIRIUS 3SK1 Advanced safety relay basic unit designed for machine safety control with time-delay function. It is used in applications like emergency stop circuits, safety gate monitoring, and controlled shutdown (STOP category 1) where machines must stop with a delay for safe process completion.
This relay is part of Siemens’ modular 3SK1 safety system, which allows flexible expansion for complex safety circuits in industrial automation.
• Siemens SIRIUS 3SK1 Advanced series safety relay
• Part Number: 3SK1121-1CB41
• Supply voltage: 24V DC
• Time-delay safety relay (OFF-delay function)
• 2 instantaneous safety outputs
• 2 time-delayed safety outputs
• Adjustable delay time: approx. 0.05 to 3 seconds
• DIN rail mounting, compact 22.5 mm design
• Screw terminal connection
• LED status and diagnostic indicators
• Supports modular expansion via 3ZY system
• Suitable for Category 4 / PL e safety systems (depending on circuit design)
• Complies with ISO 13849-1, IEC 61508, IEC 60204-1
| Parameter | Specification |
|---|---|
| Product Series | Siemens SIRIUS 3SK1 |
| Part Number | 3SK1121-1CB41 |
| Product Type | Safety Relay (Time-Delay Basic Unit) |
| Supply Voltage | 24V DC |
| Safety Outputs | 2 instantaneous + 2 delayed |
| Delay Range | 0.05 – 3 s |
| Function | OFF-delay safety timing |
| Mounting Type | DIN rail |
| Width | 22.5 mm |
| Input Type | Dual-channel safety inputs |
| Standards | ISO 13849-1, IEC 61508, IEC 62061 |
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