Top Rated Siemens Q390 – 90A 3 Pole Miniature Circuit Breaker

Designed for residential and commercial power distribution, this 90-amp three-pole QP series unit provides reliable thermal-magnetic protection. It serves as an exact, manufacturer-approved replacement for discontinued Murray MP390 models, ensuring seamless integration. The plug-on configuration installs easily into compatible Siemens load centers and P1 panelboards. Rated for 10kAIC at 240V, it includes Insta-Wire connectors for faster, more efficient conductor termination.