Circuit breaker accessory EATON 133103 — auxiliary contact block

EATON 133103 auxiliary contact block is an accessory for compatible circuit breakers that provides additional signaling and control contacts. It enables remote indication of the breaker position and integration into automation or monitoring circuits. The compact contact block mounts to the breaker body and extends functionality without altering the breaker’s primary protection characteristics, making it useful in industrial and commercial electrical panels where status feedback and interlocking are required.

Advantages

The auxiliary contact block offers reliable mechanical and electrical interfaces for breaker status signaling, designed to respond directly to the breaker’s trip and switch positions. Its compact construction conserves panel space while delivering extra contacts for control circuits. Installation does not change the breaker’s protective performance, and the block provides consistent switching behavior suitable for repetitive monitoring and control operations.

Suitable for

• Remote indication of breaker ON/OFF/tripped status in control rooms
• Integration with PLCs, SCADA and building management systems for automated monitoring
• Interlock circuits and control logic within distribution and motor control centers
• Retrofitting existing panels to add signaling without replacing breakers

Key specifications

• Function: auxiliary contacts for status signaling and control
• Mounting: accessory attachment to compatible circuit breakers
• Contact type: mechanical changeover/contact switching synchronized with breaker mechanism
• Construction: compact housing suitable for panel installation
• Intended environment: industrial and commercial electrical panels

How to use

Mount the auxiliary contact block onto a compatible circuit breaker according to the breaker manufacturer’s mechanical and electrical instructions. Connect the contact terminals to the control or monitoring wiring routed to relays, PLC inputs, alarm circuits or indicator lights. Ensure all power is isolated before making connections and verify that the block engages correctly with the breaker mechanism so that contact position corresponds to breaker ON, OFF and tripped states. After installation, perform functional tests by operating the breaker and confirming correct signaling to the monitoring equipment.

Usage recommendations

Use the auxiliary contact block only with circuit breakers and mounting arrangements specified by the breaker manufacturer. Observe rated voltages and current limits for signaling circuits, and follow local electrical codes and safety procedures during installation and maintenance. Periodically inspect contact integrity and wiring connections as part of routine panel maintenance.