The Siemens SENTRON 3VA2010-8JP42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for 100 A continuous current, built around the ETU550 electronic trip unit. This is a line-protection device, meaning it is designed for feeder and distribution circuits rather than motor protection — the ETU550 provides adjustable overload and short-circuit protection curves suited to cable and busbar protection in switchboards and panelboards. Rated insulation voltage is 800 V, and the interrupting capacity reaches 440 kA at 240 V, 330 kA at 415 V and 440 V, 220 kA at 500 V, and 52.5 kA at 690 V. Those figures mean this breaker can safely clear a bolted fault at the full available short-circuit current of most industrial low-voltage distribution systems without needing an upstream current-limiting fuse — it is self-protecting across a wide voltage range. The unit includes a communication function, allowing remote monitoring of breaker status via the SENTRON powerconfig software. Front-side protection is IP40.
Sourcing and Lifecycle
For a BOM freeze or a PCN watch, the SENTRON 3VA series is Siemens' current-generation MCCB platform, so no near-term obsolescence is expected. The ETU550 trip unit is a common variant, making this breaker a stable line-item for new panel designs or replacement of older 3WL or 3VF series breakers in retrofit applications.
Dimensions and Panel Fit
The breaker measures 181 mm high, 140 mm wide, and 86 mm deep — a standard 4-pole MCCB footprint for the 100 A frame size. It mounts via four screws to a backplate or DIN-rail adapter (the 3VA series uses a screw-fixed base; a DIN-rail mounting plate is available as an accessory). Verify the 140 mm width against your existing busbar or cable-ladder spacing before ordering. Power dissipation at rated current is 7.7 W maximum — negligible for panel thermal calculations in a ventilated enclosure, but worth noting if the breaker is in a sealed, high-density cabinet with multiple devices.