Siemens COUPLING RELAY IM

The Siemens SIRIUS 3RQ1 coupling relay is a high-performance, force-guided safety component designed for industrial automation and control systems. It serves as a reliable interface for fail-safe coupling of control signals to and from a controller, while also functioning as a contact extension module for 3SK safety relays. Engineered for safety-critical applications, this device ensures operational integrity and seamless integration within complex electrical architectures.

Advantages

This coupling relay features force-guided contacts, which are essential for monitoring and safety-related feedback loops. The compact 17.5 mm width allows for efficient use of space in control cabinets, while the removable terminals facilitate rapid installation and straightforward device replacement during maintenance. By utilizing device connectors, the relay can be easily linked to 3SK safety relays, significantly reducing the amount of required wiring and minimizing potential points of failure.

Suitable for

• Fail-safe coupling of control signals
• Contact extension for safety relays
• Industrial automation systems requiring SIL 3 or PL e certification
• Applications where space-saving components are necessary

When it may not be suitable

This relay is specifically designed for safety-critical industrial applications and may be over-specified for simple, non-safety-related switching tasks. It is not intended for use in environments that exceed its specified voltage or environmental operating parameters.

Key specifications

• Contact configuration: 1 NO contact / 1 NC contact
• Rated voltage: 24 V DC
• Safety rating: Up to SIL 3 / PL e
• Width: 17.5 mm
• Connection type: Screw terminals

How to use

The relay is designed for mounting on standard DIN rails within an industrial enclosure. Connect the control signals to the designated input terminals and wire the output contacts to the safety circuit or controller as required. If using in conjunction with 3SK safety relays, utilize the appropriate device connectors to establish communication without additional external wiring. Ensure all connections are tightened securely according to the specified torque requirements to maintain electrical integrity.

What to consider before purchase

• Verify that the 24 V DC voltage matches your control system requirements.
• Ensure the 1 NO / 1 NC contact configuration meets your specific safety logic needs.
• Confirm that the screw terminal connection type is compatible with your existing wiring standards.
• Check the available space in your control cabinet to ensure the 17.5 mm width fits your layout.

Usage recommendations

Always perform a functional test of the safety circuit after installation to verify that the force-guided contacts operate correctly and that the safety logic is functioning as intended.