MCCB for line protection — 100 A continuous, ETU850 trip unit
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. 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.
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.