Siemens 3VA4140-4ED14-3AA0 Circuit Breaker, 1-pole 40 A, 25

Mounts in a standard panelboard or enclosure on a DIN rail or direct-mount bus system. The UL Frame 125 footprint matches other 3VA4 breakers for bus-bar and lug spacing. At 40 A fixed, there is no adjustment dial — the Ir is set at the factory, which eliminates a tamper point in dusty environments like cement plant MCC rooms where a sealed breaker eats the dust and runs without drift.