ABB 1SDA054910R1 Changeover Contact Relay Module

ABB 1SDA054910R1 AUX-C T4-T5-T6 1Q 1SY 250 Vac/dc is an auxiliary contact accessory for ABB TMAX molded‑case circuit breakers (Formula A3). It provides a single changeover contact (1Q) in Form C configuration with a dedicated trip‑indication output (DD2), allowing status signals to be wired to control circuits or monitoring equipment when the breaker is closed or has tripped. The unit is designed for wiring up to 250 V AC or DC and uses the T4, T5, and T6 terminal designations for connection. As an ABB‑branded accessory, it is intended to be mounted with ABB TMAX devices and is compatible with related 1Q/1SY auxiliary contact blocks. Typical applications include signaling and interlocking in switchgear assemblies, PLC‑driven control logic, and alarm interfaces in electrical distribution panels relying on a reliable status output from the breaker. The part number is listed in ABB's general catalog of molded‑case circuit breaker accessories, confirming its role as an auxiliary contact kit within the ABB ecosystem for modular protection and control components.