Square D QOU340 – 40A 3 Pole Miniature Circuit Breaker Hot Picks

Built for commercial applications, the QOU340 is a 3-pole, 40A miniature circuit breaker from Square D. It provides reliable power distribution for OEM panels and enclosures. The unit mount configuration is compatible with DIN rail systems. It includes box lugs that accept 14-2 AWG wire, supporting surface, flush, or DIN rail mounting. With a 10 kAIC rating at 240VAC, it ensures robust overload protection. The HACR-rated unit also features a Visi-Trip indicator for fast troubleshooting.