What the 100 A rating means for your motor circuit
The Siemens SENTRON 3VA2110-7MN36-0KC0 is a 3-pole molded case circuit breaker rated 100 A continuously across the full ambient range from 40 °C to 70 °C — no derating needed in a warm panel. That thermal stability is unusual; most breakers start to down-rate above 40 °C. It is designed specifically for motor protection, with phase failure detection built in, so it will trip on a lost phase before the motor burns out.
Breaking capacity: where it fits
At 240 V the interrupting rating is 330 kA — that is very high, typical for a main breaker in a large distribution board. At 415 V it drops to 242 kA, still enough for most industrial services. At 690 V it falls to 3.7 kA, so do not use this as a motor starter on a 690 V line unless the fault current is known to be below that. The trip time is adjustable between 4 s and 17 s, which gives some selectivity headroom with downstream breakers.
Built-in accessories for panel integration
The breaker ships with two auxiliary switches (HQ type) and a shunt trip release (STL) already fitted. That means you can signal the PLC on trip and remotely open the breaker without adding a separate under-voltage release. The shunt trip is a voltage-triggered release — you energise it to trip, so it works with a remote E-stop pushbutton or a safety relay. No undervoltage release is installed, so the breaker will not drop out on a brief power dip — that is the right choice for motor circuits that should ride through sags.