Square D QO340 – 40A 3 Pole Miniature Circuit Breaker Best Price

Built for commercial and industrial applications, the Square D QO340 delivers 40 amps of thermal-magnetic protection in a three-pole configuration. This miniature circuit breaker is designed to integrate seamlessly into QO load centers and NQ panelboards. The plug-on mounting style ensures a secure connection, while the box lug terminals accommodate 8-2 AWG copper or aluminum wire. A standout feature is the signature Visi-Trip indicator, which provides a highly visible red flag when tripped.