Siemens 3VA2125-5JP42-0AA0 — 25 A SENTRON MCCB with ETU550 Trip
The ETU550 trip unit gives you adjustable long-time, short-time, instantaneous, and ground-fault protection curves — that's the kind of selectivity coordination a site electrical engineer needs to stage breakers downstream without nuisance trips on a fault. At 240 V it interrupts 187 kA; at 415 V it holds 121 kA; at 690 V the rating drops to 3.7 kA. Panel footprint is 140 mm wide by 181 mm high by 86 mm deep — that's a 5.51 by 7.13 by 3.39 inch envelope.
Integration — DIN Rail, Communication, and Derating
The 140 mm width occupies four 27 mm module spaces — plan your enclosure fill factor accordingly. Side-to-side clearance for heat dissipation follows the standard SENTRON derating rules; at 25 A continuous and 0.6 W max power loss, thermal management is straightforward in a ventilated panel. The communication function means it can integrate with a fieldbus system via the SENTRON communication module — useful for a controls integrator who wants remote trip indication, load monitoring, and energy data without running separate wires back to the PLC. No undervoltage release, no voltage trigger, no ground-fault monitoring version on this variant. If your application requires undervoltage protection or GFCI, you need the accessory modules (5SQ2670-2YA06 for shunt trip, 5SQ2670-2YA63 for UVR).