What this MCCB delivers
The Siemens SENTRON 3VA2125-5HK46-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for 25 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. It carries an ETU340 electronic trip unit, which gives you adjustable long-time, short-time, instantaneous, and ground-fault protection curves. The interrupting ratings are substantial: 187 kA at 240 V AC, 121 kA at 415 V and 440 V, 76 kA at 500 V, and 17 kA at 690 V. That puts it in the high-interrupting-capacity class for industrial distribution panels where fault currents can be severe.
The ETU340 release lets you coordinate selectively with downstream breakers: you can set the short-time pickup and delay so a feeder fault clears before this main trips, keeping the rest of the bus live.
It's designed for panel mounting with screw connections — no DIN-rail clip on this frame size. The 4-pole configuration covers three-phase plus neutral, with the neutral protection adjustable to OFF or 100% of the phase setting.