Circuit breaker accessory Siemens 5ST3653 — auxiliary contact module for compatible breakers

Siemens 5ST3653 auxiliary contact module is an accessory designed to add signaling and control functionality to compatible Siemens miniature and molded-case circuit breakers. The module provides one or more auxiliary contacts that change state with the breaker, enabling remote status indication and integration into control and alarm circuits within industrial and commercial electrical panels. The accessory fits in-line with the breaker and is intended for use where additional feedback or interlocking is required without changing breaker size or primary protection characteristics.

Advantages

The auxiliary contact module supplies reliable mechanical feedback tied directly to the breaker position, allowing accurate remote indication of ON/OFF/tripped states. It is designed to maintain electrical isolation between the main power circuit and control or signaling circuits, reducing the risk of interference. The compact form factor preserves panel space while extending breaker functionality, and the module is factory-matched to ensure consistent mechanical and electrical compatibility with supported Siemens breakers.

Suitable for

• Remote indication of breaker status in control rooms and SCADA systems
• Interlocking and safety circuits that require confirmation of breaker position
• Alarm circuits to detect tripped or open breaker conditions
• Integration into building management and industrial control panels

Key specifications

• Function: auxiliary signaling/contact module for circuit breakers
• Contact type: changeover or normally open/closed contact configuration depending on model connection
• Electrical rating: suitable for low-voltage control and signaling circuits (voltage and current rating per installation requirements)
• Mounting: designed to attach to compatible Siemens miniature or molded-case breakers
• Connection: screw or push-in terminals for control wiring (refer to breaker and accessory documentation for terminal details)
• Mechanical operation: contact state follows breaker handle position for direct status feedback

How to use

Install the auxiliary contact module onto the compatible Siemens breaker following the manufacturer's mechanical coupling instructions and wiring diagrams. Connect the control or signaling conductors to the module terminals, ensuring correct polarity and secure terminations. Verify the module's contact configuration against the control circuit requirements and test operation by operating the breaker handle to confirm that contact states change as expected. Perform insulation and continuity checks as part of initial commissioning and after any maintenance work.

Usage recommendations

Use the module only with breakers and panel installations for which it is specified. Ensure control circuit voltage and current do not exceed the module's rated limits and follow local wiring regulations and safety practices. Regularly inspect terminals and mechanical coupling for wear or loose connections, and test signaling circuits periodically to confirm reliable operation.