The Siemens 3VA2125-7KP46-0AA0 is a SENTRON molded case circuit breaker (MCCB) with 4 poles, rated for a continuous current of 25 A across the full ambient range from 40 °C up to 70 °C — no derating needed in a warm panel. It carries an ETU850 electronic trip unit, which gives you adjustable time-current curves (tr min 0.5 s, tr max 25 s) and configurable N-conductor protection (OFF, 40 % to 160 %). The interrupting ratings are substantial: 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 3.8 kA at 690 V. That kind of SCCR headroom means it can sit upstream of smaller branch breakers without worrying about cascading failure — useful for a main or feeder in a high-fault industrial panel.
Communication and monitoring
The ETU850 release includes a communication function and an other measurement function — meaning it can report trip data and power quality metrics over a bus, though the specific protocol is not listed here. For a controls integrator, that means you can pull event logs and load profiles without climbing to the panel.