ABB 1SDA052978R1 Molded Case Circuit Breaker

ABB 1SDA052978R1 is a Tmax SACE molded-case circuit breaker from ABB (originally ASEA BROWN BOVERI). The device is documented as part of the Tmax T1/UEP 40 family, with some catalogs listing a 40C variant; the part number 1SDA052978R1 carries the R1 revision tag. This MCCB belongs to ABB’s Tmax line and is intended for overcurrent protection within electrical distribution equipment that uses Tmax T1 components. The 40 in the model name signals the current-rating class associated with this variant, aligning with the 40-amp class found in the Tmax T1/UEP lineup, and the references consistently place it in the 1SDA0x78xR1 family pattern within the Tmax ecosystem. As an ABB-origin part, it reflects the Tmax design language familiar to panel builders and service technicians working with ABB installations, offering a compact, interchangeable form factor within the Tmax family for integration into appropriate distribution panels and switchgear.