Siemens 3RA2922-2H Mechanical Interlock for S0 Contactors

The Siemens 3RA2922-2H mechanical interlock is a precision-engineered component designed to ensure the safe and reliable operation of contactor combinations. Specifically developed for size S0 contactors, this kit facilitates the secure interlocking of two 3-pole or 4-pole units, effectively preventing simultaneous activation. By providing a robust physical barrier against concurrent switching, it serves as a critical safety element in industrial control panels and motor management systems.

Advantages

This mechanical interlock offers high operational reliability by physically preventing the engagement of two contactors at the same time, which is essential for avoiding short circuits in reversing starter configurations. The design is part of the SIRIUS modular system, ensuring seamless integration with compatible contactors and simplifying the assembly process. Its durable construction provides long-lasting performance in demanding industrial environments, maintaining precise alignment and mechanical integrity over extended service cycles.

Suitable for

• Reversing starter applications
• Motor control systems requiring interlocking
• Safety-critical control circuit configurations
• Industrial automation panels

This interlock is not suitable for contactors outside of the S0 size category or for non-compatible series. It should not be used in applications where electrical interlocking is the sole requirement without the need for physical mechanical protection.

Key specifications

• Compatibility: Size S0 contactors
• Configuration: Lateral interlock
• Components included: 2 connectors and 1 anchor
• System compatibility: SIRIUS modular system
• Application: 3-pole and 4-pole contactors

To install the interlock, ensure that both contactors are de-energized and disconnected from the power supply. Attach the mechanical connectors to the sides of the contactors as specified in the installation guide, then secure the anchor to lock the combination in place. Verify that the mechanical movement is smooth and that the interlock effectively prevents both contactors from closing simultaneously before applying power to the control circuit.

What to consider before purchase

• Verify that your contactors are size S0
• Ensure the application requires a lateral mechanical interlock
• Check compatibility with your existing SIRIUS modular components

Always perform a functional test of the mechanical interlock mechanism before integrating the contactor assembly into a live electrical system to ensure maximum operational safety.