Schneider Electric QOB3100 Molded Case Circuit Breaker

Schneider Electric’s Square D QOB3100 is a 3-pole molded case circuit breaker (MCCB) rated at 100 A with a 120/240 V AC nominal input, designed for bolt-on installation in compatible QO/QOB panelboards. It delivers thermal-magnetic overcurrent protection with a short-circuit interrupting capacity of 10 kA at 240 V, making it suitable for safeguarding three-phase feeders and branch circuits in commercial distribution. The compact QOB3100 unit uses a three-pole configuration to protect all phases simultaneously and is built for straightforward replacement in compatible enclosures thanks to its bolt-on mounting. As part of the Square D by Schneider Electric family, the QOB3100 integrates with other QO/QOB devices, offering a cohesive protection strategy for electrical systems that require reliable, code-conscious overcurrent protection.