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. 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.
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.