Square D QO390 – 90A 3 Pole Miniature Circuit Breaker Secure Checkout

Designed for commercial and industrial environments, the QO390 delivers robust thermal-magnetic protection for three-phase systems. It mounts into standard Square D QO load centers, NQ panelboards, and Speed-D switchboards without requiring special tools. Featuring the signature Visi-Trip indicator, this 10kAIC rated component allows maintenance personnel to quickly identify tripped circuits, minimizing downtime in critical facility operations.