ABB T4HQ100EW Three-Phase Molded Case Circuit Breaker

ABB's Tmax T4HQ100EW is a 3-pole molded-case circuit breaker rated at 100 A, designed for three-phase distribution in commercial and industrial electrical systems, and it uses an LSIG electronic trip unit for precise overcurrent protection, enabling fast response to faults while protecting wiring and equipment. Although the product title lists 480 V as the working voltage, the Tmax family supports up to 600 V, and this unit is suitable for 480 VAC circuits in typical installations, with UL current-limiting protection that reduces fault energy to downstream equipment. The T4HQ100EW provides a substantial 65 kA interrupting capacity at 480 VAC, allowing safe interruption of high-energy faults in feeders and motors; it is intended for use in panel boards, switchboards, and motor control centers where dependable three-phase protection is required. As part of ABB's Tmax line, the T4HQ100EW accepts standard trip-unit variants (PR221 LS/I and PR222 LSIG) and is designed for installers seeking reliable, code-compliant protection with clearly defined ratings and a robust, compact MCCB footprint.