What this MCCB carries
The Siemens SENTRON 3VA2025-8KP36-0AA0 is a 3-pole molded case circuit breaker rated for 25 A continuous current, with a frame that accepts up to 300 A maximum and a minimum trip setting of 38 A. It uses the ETU850 electronic trip unit, which gives you adjustable long-time, short-time, instantaneous, and ground-fault protection curves — not a fixed thermal-magnetic bimetal. The rated insulation voltage is 800 V, so it's comfortable in 480 V and 600 V class panels. Breaking capacity runs 440 kA at 240 V, 330 kA at 415 V and 440 V, 220 kA at 500 V, and 52.5 kA at 690 V. That's a high-interrupting rating for a 25 A frame — it handles fault currents in large transformer-fed distribution without needing a current-limiting upstream device.
Panel fit and environment
Dimensions are 105 mm wide, 181 mm tall, 86 mm deep. It mounts into a standard SENTRON 3VA panel footprint — same cutout and bus-bar spacing as the rest of the 3VA2 frame family. IP40 on the front face means it's protected against solid objects over 1 mm, but not sealed against moisture; keep it in an indoor enclosure rated for the ambient. Operating temperature range is -25 °C to 70 °C; storage from -40 °C to 80 °C. Power loss at rated current is 0.5 W — negligible for thermal budgeting inside a packed panel.