Hubbell HBL400MBK Single Pole Circuit Breaker

The Hubbell HBL400MBK is a 400-amp, 600-volt single-pole circuit breaker designed to interrupt current and protect a single electrical circuit from overloads. Manufactured by Hubbell, this model carries the HBL400MBK designation and is intended for use in panelboards or distribution setups that require a single-pole device rated for up to 400 A and a maximum voltage of 600 V. Key specifications include a 400 A current rating and a 600 V maximum operating voltage, with a compact form factor suitable for standard panelboard installations. By quickly disconnecting the circuit when fault current exceeds the rated capacity, it helps prevent damage to conductors and connected equipment.