Siemens
Siemens 3SK1112-1BB40 SIRIUS Safety Relay (24V DC)
Siemens 3SK1112-1BB40 SIRIUS safety relay, Basic unit, 24V DC.
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SIRIUS Standard series
Electronic safety relay
2 enabling circuits
1 signaling circuit
24V DC operation
Screw terminals
Product description
The Siemens 3SK1112-1BB40 is a SIRIUS safety relay, categorized as a basic unit within the Standard series. This electronic safety relay is designed for monitoring enabling circuits to ensure machine safety.
It offers two independent enabling circuits and one signaling circuit. The unit operates on a 24 V DC supply voltage and features screw terminals for straightforward wiring. Its electronic design provides reliable safety function monitoring.
Stanlo Automation, a veteran-owned supplier of surplus industrial automation parts, provides the Siemens 3SK1112-1BB40. Equip your safety systems with dependable and cost-effective solutions from our extensive inventory.
Technical specifications
| Part Number | 3SK1112-1BB40 |
| Manufacturer | Siemens |
| Product Type | Safety Relay |
| Series | SIRIUS Standard |
| Unit Type | Basic Unit |
| Enabling Circuits | 2 |
| Signaling Circuit | 1 |
| Supply Voltage (Us) | 24 V DC |
| Terminal Type | Screw Terminal |
Common applications
Emergency stop monitoring
Safety gate monitoring
Light curtain safety
Machine safety
Industrial control panels
Safety interlocks
Compatible systems
Safety sensors (E-stops, gate switches)
Control panels
Industrial machinery
Also known as
Siemens SIRIUS 3SK1112-1BB40
3SK1112-1BB40 Safety Relay
Siemens 24V DC Safety Relay
Replaces / compatible with
This electronic safety relay is designed to monitor safety circuits, offering a reliable solution for machine safety applications requiring two enabling paths.
Technical note
Expert tip
The 3SK1112-1BB40 requires a 24V DC power supply. Ensure correct polarity when connecting the power supply to the terminals.What happens next?
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Frequently asked questions
What are the key safety functions of the Siemens 3SK1112-1BB40?
The Siemens 3SK1112-1BB40 monitors two enabling circuits and provides one signaling circuit. This allows it to safely detect faults or the activation of safety devices, ensuring immediate shutdown of hazardous machine movements.