MA11128 is a Square D undervoltage release accessory for MA-series molded‑case circuit breakers. It uses a 48 V DC release coil to trip the breaker when control voltage is removed, delivering a fail‑safe interruption of the protected circuit. The accessory is compatible with MA, MAF, MAL, MAP, MH, MHF, MHL, and MHP frame breakers, and when installed the breaker catalog suffix is -1128. This MA11128 UVR extends protection options within the Square D MA family, enabling automatic tripping on voltage loss to help safeguard equipment and personnel in control circuits that rely on consistent voltage supervision.
