The Siemens SENTRON 3VA2025-7KP36-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated for 25 A continuous current, built around the ETU850 electronic trip unit.
The 25 A continuous rating holds flat across the full ambient range from 40 °C to 70 °C — no derating needed as the panel warms up, which simplifies sizing in a crowded enclosure. Interrupting capacity hits 330 kA at 240 V and still delivers 242 kA at 415 V and 440 V. That's serious fault-clearing for high-available-fault-current installations like large transformer secondaries or industrial switchboards. At 690 V it drops to 3 kA — this breaker is not your primary choice for 690 V distribution. No undervoltage release or shunt trip is built in, so plan external modules if you need those functions.
Dimensions are 105 mm wide, 181 mm high, and 86 mm deep — a standard 3-pole MCCB footprint that fits most DIN-rail or panel-mount bases. The 86 mm depth leaves room behind the door for wiring and accessory modules. Operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C. Max power loss is only 0.5 W, so heat buildup in a sealed enclosure is negligible.