MCCB for line protection — 100 A continuous, ETU850 trip unit
The Siemens 3VA2010-7KP42-0AA0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries a rated continuous current of 100 A across the full operating temperature range from 40 °C to 70 °C, with no derating needed — the same 100 A holds at every point from 40 °C through 70 °C. That thermal stability simplifies panel design: you don't have to oversize the frame for a warm cabinet. The electronic trip unit is an ETU850, a microprocessor-based release that supports communication and other measurement functions. Four poles handle three-phase plus neutral, and the insulation voltage is rated 800 V. The interrupting ratings are substantial: 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 3 kA at 690 V. For a 100 A frame, that SCCR headroom means it can be applied upstream of high-fault panels without cascading concerns. Front protection is IP40, suitable for enclosed panel mounting where tools or fingers won't contact live parts. The operating temperature range is -25 °C to 70 °C, with storage from -40 °C to 80 °C. Power loss at rated current is 7.7 W maximum — manageable for thermal coordination inside a sealed enclosure.
Physical fit — 140 mm wide, 86 mm deep, 181 mm tall
The 3VA2010-7KP42-0AA0 measures 140 mm wide, 86 mm deep, and 181 mm tall. That 140 mm width on a 4-pole 100 A frame is standard for the SENTRON 3VA platform — it occupies the same footprint as other 4-pole 3VA breakers in this current class. When retrofitting into an existing panel, verify the mounting plate accommodates the 140 mm width and the depth clearance for the ETU850's wiring compartment.