QO Circuit breaker load centers, QOC42US, from Square D are UL Listed and CSA rated panelboards. and meet Federal Specifications W-P-115c, Type 1, Class 2 for use in government housing. They are designed to meet residential, commercial, and industrial requirements to protect electrical systems, equipment, and people. Simple reading of current value and threshold with clear LED display. 10 million cycles mechanical durability for minimum required maintenance on your pressurized fluid circuits.