Siemens 3RV2901-2E Auxiliary Switch, 1NO+1NC, Lateral Mounting for Motor Circuit Breakers

The Siemens 3RV2901-2E auxiliary switch is a precision-engineered component designed for lateral mounting on SIRIUS motor circuit breakers. This device provides essential status feedback by indicating the switching state of the main circuit breaker, which is critical for the reliable operation of industrial control systems. With a configuration of one normally open (NO) and one normally closed (NC) contact, it ensures seamless integration into electrical panels for monitoring and control purposes.

Advantages

This auxiliary switch offers high operational reliability and is specifically designed to integrate perfectly with the SIRIUS modular system. Its lateral mounting design saves space within the control cabinet, allowing for a compact installation without compromising the functionality of the motor circuit breaker. The robust construction ensures long-term performance in demanding industrial environments, providing accurate signaling that helps prevent downtime and enhances system diagnostics.

Suitable for

• Industrial motor control centers
• Electrical distribution panels
• Automation systems requiring status feedback
• Motor protection applications

This device may not be suitable for applications requiring high-power switching, as it is designed strictly for control circuit signaling. It is also not intended for use with circuit breakers outside the compatible SIRIUS series, as mechanical and electrical compatibility is specific to this product line.

Key specifications

• Contact configuration: 1 NO (Normally Open) + 1 NC (Normally Closed)
• Mounting type: Lateral
• Compatibility: SIRIUS motor circuit breakers
• Function: Status signaling

To install the auxiliary switch, ensure the motor circuit breaker is disconnected from the power supply. The switch is designed to be snapped onto the side of the breaker housing. Once physically attached, connect the control wires to the terminal points according to the wiring diagram of your control system. Verify that the mechanical linkage is correctly engaged before restoring power to the circuit.

What to consider before purchase

• Verify compatibility with your specific SIRIUS motor circuit breaker model
• Ensure there is sufficient lateral space in your electrical panel for the mounting
• Confirm that the control voltage and current requirements match your system specifications

For optimal performance and safety, always ensure that the auxiliary switch is installed by qualified personnel and that all connections are tightened to the manufacturer's specified torque settings. Regular inspection of the control circuit is recommended to maintain system integrity.