Siemens BQD320 U Three Phase Molded Case Circuit Breaker

Siemens BQD320U is a three-phase molded-case circuit breaker (MCCB) engineered to provide overload and short-circuit protection for three-phase feeders and motor circuits in industrial and commercial installations. With a 20 A nominal current rating and a maximum operating voltage of 480 V AC, the BQD320U is part of Siemens' BQD family of compact MCCBs designed for modular protection across currents. The device uses a three-pole frame to interrupt all conductors simultaneously, aiding coordination with upstream devices in balanced three-phase networks. Its compact enclosure and standard mounting enable installation in panelboards and switchgear that accept MCCBs, making it suitable for feeders to motors, pumps, conveyors, and other three-phase loads. It sits alongside other BQD ratings in the same family (e.g., 315, 325, 330), reflecting Siemens' approach to consistent protection across voltages up to 480 V AC and 50/60 Hz systems. Designed for integration in Siemens panels and switchgear, the BQD320U can be used in new installations or upgrades where reliable three-phase protection is required.