Square D by Schneider Electric QOB340 Circuit Breaker

Square D by Schneider Electric QOB340 is a bolt-on, three-pole miniature circuit breaker rated 40 A at 120/240 V AC with a 10 kA interrupting capacity. As a bolt-on variant of the QO family, QOB340 provides thermal-magnetic protection for three‑phase circuits and is designed to be mounted on compatible bus bars within panelboards or switchgear that accept bolt-on breakers. The 3‑pole configuration supports synchronized trip across all phases, ensuring balanced protection for three-phase feeders and machinery circuits. The device is intended for use in commercial and light-industrial electrical distributions where three‑phase protection is required, and it carries the model designation QOB340 to identify its 3‑pole, 40‑amp, 10 kAIC specifications. Ensure the installed panel or base is compatible with QOB bolt‑on breakers and that the circuit’s voltage and protection rating align with the breaker’s 120/240 V AC operating range and 10,000 A short‑circuit interrupting capacity.