SENTRON 3VA1125-5EF32-0DH0 — MCCB for line protection
The Siemens 3VA1125-5EF32-0DH0 is a 3-pole SENTRON molded case circuit breaker (MCCB) rated for line protection at 25 A continuous current (Iu). It carries a TM240 thermal-magnetic trip unit — thermal for overload, magnetic for short-circuit — and is in active current production. Interrupting capacity is the headline here: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 690 V. That SCCR headroom means it handles high-fault utility feeds without cascading upstream — a key spec for service-entrance or main-breaker positions in a panel. The thermal derating curve is flat from 40 °C to 50 °C at 25 A, then drops to 24 A at 55 °C, 23.5 A at 60 °C, 23 A at 65 °C, and 22.5 A at 70 °C. If the enclosure ambient runs hot, factor that 2–2.5 A loss above 50 °C.
DIN-rail footprint and auxiliary configuration
The 3VA1125-5EF32-0DH0 measures 130 mm high, 76.2 mm wide, and 70 mm deep — a standard 3-pole MCCB footprint that clips onto a DIN rail. The 76.2 mm width (roughly 3 module spaces) matches the SENTRON 3VA family spacing, so panel layout stays consistent across ratings. It ships with an undervoltage release (UVR) fitted — design order code 3VA9608-0BB25 for the integrated auxiliary trip — plus 2 auxiliary switches and 1 trip alarm switch (HQ version). That gives remote status indication and undervoltage coil supervision without adding external relays. Front protection is IP40 — fine for a clean panel interior; not rated for washdown or outdoor exposure.