The Siemens SENTRON 3VA2025-6KP36-0AA0 is a 3-pole molded case circuit breaker rated for 25 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling, which simplifies panel thermal budgeting in a warm enclosure. Its interrupting capacity hits 242 kA at 240 V and 187 kA at 415 V, dropping to 3 kA at 690 V; that 242 kA figure at 240 V means it can clear a fault on a high-capacity transformer secondary without the breaker welding shut, a key selectivity gate for main or feeder positions.
The IP40 front protection means it's suited for enclosed distribution boards where the door or cover shields the breaker face; no washdown rating, so keep it out of wet zones.