The Siemens 3VA2125-6KP32-0AA0 is a 3-pole SENTRON 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. The 242 kA breaking capacity at 240 V AC means it can safely interrupt a fault current up to that level without the arc flashing over or the breaker rupturing; at 415 V and 440 V it still holds 187 kA, dropping to 121 kA at 500 V and 3.8 kA at 690 V. The ETU850 electronic trip unit gives you adjustable long-time (tr) from 0.5 to 25 seconds and short-time (tsd) up to 0.5 s, so you can coordinate selectively with downstream breakers. That's the kind of curve shaping you need for a distribution panel, not just a branch-circuit snap. Communication function is onboard, so it can talk to a building management or SCADA system — no separate comm module required. Mounts on a panel or in an enclosure — the 105 mm width, 181 mm height, and 86 mm depth (4.1 by 7.1 by 3.4 inches) fit the standard SENTRON 3VA footprint.
Panel integration and mechanical fit
Latching endurance rated at 20,000 operations — that's a mechanical life figure, not the electrical endurance under load (which will be lower at full rated current). Storage temperature range is -40 °C to 80 °C; operating range is -40 °C to 70 °C, so it's fine for unheated warehouses or outdoor enclosures in temperate climates as long as the IP40 front is protected from rain.