Siemens B140 – 40A 1 Pole Molded Case Circuit Breaker Best Seller

Built for robust commercial and industrial use, this 40-amp BL series breaker delivers dependable power distribution. The bolt-on design mounts into Siemens P1, P2, P3, P4, and P5 panelboards. It also acts as a substitute for BAB1040, QOB140, and THQB1140 models when cross-referencing compatible systems. Equipped with fixed thermal-magnetic trip units, it ensures precise long-time and instantaneous (LI) protection. The unit is HACR rated and provides a 10kAIC interrupting capacity at 120/240VAC.