The Siemens 3VA1125-4EF32-0JC0 is a 3-pole SENTRON molded case circuit breaker rated 25 A continuous at 40 °C, with full thermal current up to 50 °C before derating begins at 55 °C (24 A) and 65 °C (23 A). That means it holds its full rating across typical North American and European panel ambient conditions — no headroom lost until the enclosure runs hot. Interrupting capacity is 121 kA at 240 V, 75.6 kA at 415 V, and still 11.9 kA at 690 V.
Line protection design — what it does and doesn't do
Maximum power loss is 8.5 W, so thermal management in a dense panel is straightforward — no forced cooling required for this single breaker.
Mounts on DIN rail or direct panel. The 70 mm depth leaves clearance for standard 80 mm deep enclosures with wiring gutters. No trip indicator on the front face — status is read from the handle position or the auxiliary switches.