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. It's designed for line protection in distribution panels and motor control centers where you need adjustable protection curves and communication capability.
What the ratings mean for your panel
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. Rated insulation voltage is 800 V, so the internal clearances and creepage are designed for 690 V systems with margin. The IP40 front protection means it's fine in a clean indoor panel but not for washdown areas. The ETU850 electronic trip unit gives you adjustable long-time, short-time, instantaneous, and ground-fault protection curves — plus communication capability for remote monitoring and coordination. No undervoltage release or shunt trip is built in, so plan external modules if you need those functions.
Physical fit and panel integration
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.