Schneider Electric MA11128 U Molded Case Circuit Breaker

MA11128 U is Schneider Electric’s 48 VDC undervoltage release accessory for Square D molded‑case circuit breakers, providing an automatic trip signal when the supply drops below the UVR threshold. It is designed for use with MA, MAF, MAL, MAP, MH, MHF, MHL, and MHP frame molded‑case breakers, and when installed, the part number suffix appears as -1128. The UVR device operates at 48 V DC and functions to trip the associated breaker to protect equipment and enable controlled shutdown in undervoltage conditions. Typical installations include industrial control panels and distribution systems where rapid, remote tripping on voltage loss is required to safeguard processes and personnel.