Interrupting capacity and selectivity — the real constraint
The Siemens SENTRON 3VA2010-6KP36-0AA0 is a 3-pole molded case circuit breaker rated for 100 A continuous current with a flat derating curve from 40 °C through 70 °C — no reduction needed across the typical panel ambient range. The headline interrupting ratings are 242 kA at 240 V AC, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 3 kA at 690 V. That 242 kA figure at 240 V means this breaker can clear a fault at the full available short-circuit current of a large transformer secondary without the arc flashing over or the case rupturing — critical for main or tie-breaker positions in high-fault panels. The steep drop to 3 kA at 690 V tells you this is a 600 V class frame, not a 690 V design; at that voltage the breaker relies on the ETU850's fast reaction time rather than brute magnetic repulsion.
ETU850 trip unit — what it does for coordination
The electronic trip unit ETU850 provides adjustable overload (Ir) and short-time (Isd) protection. The neutral protection is adjustable OFF or from 20 % to 160 % of the phase setting. The communication function integrates with SENTRON powermanagement software for remote monitoring. Rated insulation voltage is 800 V. Power loss at rated current is 13.5 W.
Mounting and integration
Dimensions are 105 mm wide by 181 mm tall by 86 mm deep — a standard 3-pole MCCB footprint that fits most DIN-rail or panel-mount enclosures without special adapters. The front face carries an IP40 protection rating, meaning it is protected against tools and wires >1 mm but not against water ingress; mount inside a rated enclosure for washdown or outdoor environments. The 3-pole design with no undervoltage release and no voltage trigger means it is a straight thermal-magnetic + electronic breaker — no auxiliary shunt trip or UVR coil to wire.