3SK1112-1BB40

The Siemens SIRIUS 3SK1112-1BB40 safety relay basic unit features electronic output, two activation circuits, 24V DC power supply, and complies with Cat.4/PLe and SIL3 safety levels. It can monitor devices such as emergency stops and safety doors, supports automatic reset and cross-short circuit detection, and is suitable for single-channel safety circuits.

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Siemens SIRIUS 3SK1112-1BB40 Electronic Safety Relay Basic Unit

Product Positioning

The Siemens SIRIUS 3SK1112-1BB40 is a basic unit of the standard series electronic output safety relay, providing two sets of electronic activation circuits. It can be used to monitor single-channel safety circuits such as emergency stop switches and safety door locks.

Core Product Advantages and Features

Electronic dual-activation circuit

It provides two sets of electronically enabled output circuits, replacing traditional mechanical contacts, resulting in faster switching response.

Cat.4/PLe/SIL3 safety level

It complies with ISO 13849-1 Cat.4, PLe and IEC 62061 SIL3 international safety standards and is suitable for high safety requirements.

Cross-circuit detection

Built-in sensor loop cross-short circuit detection function improves the ability to detect faults when wiring is abnormal.

Elastic sensor compatibility

It accepts both floating and non-floating security sensor inputs, allowing for more flexible installation configurations.

project	Specification
Power supply voltage	24 V DC
Output type	Electronic, 2 sets of activation circuits
Security level	Cat.4/PLe (ISO 13849-1), SIL3 (IEC 62061)
Terminal type	Screw terminals
Protection level	IP20
External dimensions	Approximately 100 (length) × 92 (height) × 22.5 (width) mm
Ambient temperature	-25°C ~ +60°C

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