SENTRON 3VA2125-6HK32-0AA0 — 25 A MCCB with ETU340 Trip Unit
The Siemens 3VA2125-6HK32-0AA0 is a SENTRON molded case circuit breaker designed for line protection, rated at 25 A continuous current across the full ambient temperature range from 40 °C to 70 °C — no derating needed up to that ceiling. Three poles, with an ETU340 electronic overcurrent release. Insulation voltage rated at 800 V, so it handles 480/600 V class systems with headroom. Breaking capacity is substantial for a 25 A frame: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 3.7 kA at 690 V. That puts it in the high-interrupting category — suitable for transformer secondary or large bus feeds where fault current is high. The ETU340 trip unit provides adjustable overload and short-circuit protection curves; no undervoltage release or ground-fault monitoring on this variant.
Mounting and Environment
Mounts in a standard panel or enclosure — dimensions are 105 mm wide, 181 mm high, 86 mm deep. IP40 on the front face keeps dust out of the trip-unit compartment; the rest of the breaker is rated for the enclosure's ambient. Operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C. Power loss at rated current is 0.6 W — negligible for thermal budgeting.