Siemens AG B370HHU Molded Case Circuit Breaker

Siemens B370HHU molded case circuit breaker (HBL type) is a three-pole, 70 A device designed for 240 V AC service, providing overload and short-circuit protection in low-voltage distribution. This bolt-on, panelboard-mount MCCB is rated for 65 kA at 240 V, suitable for circuits with higher fault currents in commercial or light industrial panels. It employs thermal-magnetic trip technology with long-time and instantaneous trip functions to handle sustained overloads and momentary faults. The unit is intended for installation in Siemens panelboards or compatible busbar systems and is the bolt-on variant of the B370HH family. With a 3P configuration and a 70 A rating, it protects feeders and three-phase loads up to 70 A while delivering robust interruption performance in 240 V systems. Its molded-case construction supports reliable protection in distribution enclosures, aligning with Siemens’ BL/HBL breaker offerings for panelboard applications.