Siemens B380H Miniature Circuit Breaker

This bolt-on breaker is designed specifically for installation in Siemens P1, P2, P3, P4, and P5 commercial panelboards.

These catalog numbers represent different interrupting ratings within the same physical frame size. The B380 (Type BL) is rated at 10 kAIC, the B380H (Type BLH) is rated at 22 kAIC, and the B380HH (Type HBL) is rated at 65 kAIC at 240VAC.

The H suffix designates this as a Type BLH high-interrupting circuit breaker. It is rated to safely clear fault currents up to 22,000 amps (22 kAIC) at 240VAC, which is required in systems with higher available fault currents than standard 10 kAIC breakers can handle.

The factory-installed lugs accept 4 AWG to 1/0 AWG copper wire, or 2 AWG to 1/0 AWG aluminum wire. Ensure conductors are properly torqued according to the manufacturer specifications printed on the breaker.

No. The B380H is a bolt-on breaker intended for commercial panelboards. Standard residential load centers typically require plug-on breakers, such as the Siemens Type QP or QPH series.

The thermal component provides long-time protection by responding to sustained overloads, while the magnetic component provides instantaneous tripping to quickly clear severe short circuits. This fixed LI (Long-Time, Instantaneous) trip function ensures comprehensive circuit protection.

The breaker features an integrated bolt-on connection designed to secure directly to the busbars of compatible Siemens panelboards. No separate mounting hardware kit is typically required for standard installation.

Yes, this breaker is HACR rated, meaning it is approved for use with heating, air conditioning, and refrigeration equipment that requires a dedicated 80A, three-phase circuit.

The B380H is a 3-pole breaker designed for three-phase systems. For single-phase 240V applications, a 2-pole breaker like the B280H should be used instead to ensure proper fit and function in the panelboard.