Siemens 3RQ4118-1AM00 Plug-In Coupling Relay, 24V DC, 1CO Contact, Screw Terminals

The Siemens 3RQ4118-1AM00 is a high-performance plug-in coupling relay engineered for demanding industrial automation and control environments. This compact device is specifically designed to facilitate reliable signal isolation and switching, ensuring seamless communication between control systems and field devices. Its slim profile and robust construction make it an essential component for modern electrical control panels where space optimization is critical.

Advantages

This coupling relay offers significant benefits for industrial applications, primarily due to its space-saving 6.2mm width, which allows for high-density mounting in confined control cabinets. The use of reliable screw terminals ensures a secure and vibration-resistant electrical connection, minimizing maintenance requirements. Furthermore, the 24V DC operation and 6A thermal current rating provide a versatile solution for various low-voltage switching tasks, maintaining consistent performance and high operational reliability over long service cycles.

Suitable for

• Industrial automation control systems
• Signal isolation between PLC outputs and field devices
• Switching small to medium-sized electrical loads
• Space-constrained electrical control panels

This relay may not be suitable for applications requiring high-power switching beyond its 6A thermal current rating or for environments where AC control voltages are strictly required, as this specific model is designed for 24V DC operation. It is also not intended for use in high-vibration environments where specialized rail-locking mechanisms beyond standard DIN rail mounting might be necessary.

Key specifications

• Operating voltage: 24V DC
• Contact configuration: 1 change-over (1CO) contact
• Thermal current: 6A
• Terminal type: Screw terminals
• Width: 6.2mm
• Mounting type: DIN rail

To use the Siemens coupling relay, mount the device onto a standard DIN rail within your control cabinet. Connect the 24V DC control signal to the designated input terminals and wire your load circuit through the change-over contact terminals. Ensure that all screw connections are tightened to the manufacturer's specified torque to maintain electrical integrity and prevent overheating during operation.

What to consider before purchase

• Verify that your control system output provides a 24V DC signal.
• Ensure the load current does not exceed the 6A thermal limit.
• Confirm that the 6.2mm width fits your existing DIN rail configuration.
• Check that screw terminals are compatible with your preferred wiring method.

Usage recommendations: Always ensure the power supply is disconnected before performing any wiring or maintenance on the relay. Regularly inspect terminal connections for tightness to prevent contact resistance issues in high-duty cycle applications.