QO320

The Square D QO320 is a -pole, amp thermal-magnetic circuit breaker designed for use in Schneider Electric's QO load centers and panelboards. Part of the well-established QO (Qwik-Open) breaker family, the QO320 provides overcurrent protection for three-phase systems operating at 240 VAC. Its compact molded-case construction and plug-on mounting make it ideal for commercial, industrial, and some residential applications requiring three-pole protection. The breaker’s Qwik-Open trip mechanism ensures fast interruption of fault currents, typically reacting within 1/60th of a second, and includes a visual trip indicator for quick diagnostics.

Electrically, the QO320 is rated for [amperage} amps continuous current and has a standard interrupting capacity of {air rating}, with HACR (Heating, Air Conditioning, and Refrigeration) ratings for compatibility with HVAC loads. It uses a thermal-magnetic trip mechanism, combining a bimetallic strip for long-time overload protection and a magnetic coil for instantaneous short-circuit response. Its three-pole design ensures that all phases of a three-phase load are disconnected simultaneously in the event of a fault, maintaining compliance with NEC requirements for multi-phase equipment and feeders.

Mechanically, the QO320 features a durable, space-efficient form factor with a plug-in base for use in QO-style load centers, not to be confused with the smaller QOB bolt-on series. It accepts copper or aluminum conductors sized per manufacturer specifications, and its trip window indicator provides visual confirmation of a tripped condition. Square D’s QO breakers are UL 489 listed and widely recognized in the electrical industry for quality and reliability. The QO320 is frequently specified for three-phase branch circuits, HVAC disconnects, subpanel feeds, and motor control applications.

Purchase the QO320 at Electrical.com, your reliable partner for industrial and commercial electrical products. Our selection includes circuit breakers, panel boards and accessories from manufacturers like Square D and Schneider Electric, backed by a dedicated sales team ready to assist with technical questions, product selection, and support.