Eaton NSB-QBHW3100HT Miniature Circuit Breaker

Eaton NSB QBHW3100HT Miniature Circuit Breaker is a 3-pole, 100 A MCB rated for 240 V, designed for use in 50/60 Hz electrical systems. This unit protects branch circuits by interrupting current when an overcurrent or fault occurs, helping to prevent wiring damage and fire hazards in panel boards. It belongs to Eaton's QB family of miniature circuit breakers and is specified for three-pole installations, allowing protection of multiple conductors with a single device in 240 V distribution networks. The 100 A rating denotes the maximum continuous current the breaker can carry under normal conditions before tripping, while the 240 V rating indicates the nominal voltage of the circuits it protects. Common applications include residential, commercial, and light-industrial panel boards where a compact 3P MCB is required to safeguard 240 V circuits in a centralized distribution panel. The 3-pole design supports three live conductors in a 240 V distribution system, enabling centralized protection in multiwire branch circuits.