What it is and what it does
The Siemens 3VA2110-7MS36-0KC0 is a SENTRON molded case circuit breaker (MCCB) designed for starter protection — meaning it's built to sit ahead of a motor starter, combining short-circuit and overload protection in one compact 3-pole frame. Rated 100 A continuous across the full 40 to 70 °C ambient range, it holds its full rating without derating up to 70 °C, which simplifies panel thermal budgeting. The adjustable thermal-magnetic trip unit covers 300 A minimum to 1 500 A maximum, giving you a wide window to match motor full-load amps or downstream feeder protection. Breaking capacity is the headline: 330 kA at 240 V, 242 kA at 415/440 V, 187 kA at 500 V, and 3.7 kA at 690 V. That 330 kA at 240 V places it in the high-interrupting class — suitable for installations with high available fault current, like large transformer secondaries or industrial mains. The steep drop at 690 V (3.7 kA) means it's not a primary choice for 690 V motor circuits unless the fault current is known to be low. It ships with a shunt trip (STL) for remote opening and two auxiliary switches HQ for status feedback to a PLC or control system. No undervoltage release, no ground-fault monitoring, no communication module — this is a straightforward power breaker with remote trip capability.
Dimensions and panel fit
Footprint: 105 mm wide, 181 mm tall, 86 mm deep. That 86 mm depth includes the shunt trip and auxiliary switches mounted internally — no extra projection beyond the standard 3VA2 frame. It mounts on a DIN rail or directly to a backplate; the 105 mm width occupies three 35 mm module spaces on a standard DIN rail. When planning gland-plate clearance, account for the 86 mm plus wire bending radius for the line and load lugs.