What this MCCB is and the rating that decides the fit
The Siemens 3VA2110-7MS32-0HL0 is a SENTRON molded case circuit breaker (MCCB) built for starter protection — meaning it's designed to sit upstream of a motor contactor and handle the high inrush without nuisance tripping, while still providing short-circuit and overload protection for the motor branch. It's rated for a continuous current Iu of 100 A, and the temperature derating is tight: it holds the full 100 A from 40 °C up through 50 °C, then steps down to 96 A at 55 °C, 94 A at 60 °C, 92 A at 65 °C, and 90 A at 70 °C. That's a clean curve — you can push ambient to 50 °C without losing any ampacity, which matters in a crowded panel. The breaking capacity is the headline number here: 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 52.5 kA at 690 V. For a 100 A frame, that's a very high interrupt rating — it tells you this breaker is meant for installations where the available fault current is substantial, like a main distribution board or a large motor control center. The 3-pole construction and 800 V rated insulation voltage (Ui) confirm it's sized for 400 V class systems with headroom.
Release, auxiliaries, and what's inside the can
The overcurrent release is an ETU310M — that's an electronic trip unit with adjustable thermal and magnetic settings, typical for motor protection where you need to dial in the overload class and short-circuit pickup to match the motor full-load amps. It's paired with a shunt trip (STL) for remote tripping, and the auxiliary contact block carries 2 auxiliary switches + 1 trip alarm switch + 1 electrical alarm switch. The basic switch is order code 3VA2110-7MS32-0AA0, and the integrated auxiliary trip is 3VA9688-0BL30 — useful to know if you're replacing just the trip unit or the aux block separately. Mechanical endurance is rated at 20,000 operations. Operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C. Power dissipation maxes out at 75 W.
Panel fit and dimensions
The 3VA2110-7MS32-0HL0 measures 105 mm wide, 181 mm high, and 86 mm deep. That's a standard SENTRON 3VA frame size — it mounts on a DIN rail or can be screw-fixed to a backplate. The 105 mm width is the same as other 3-pole 3VA2 breakers, so if you're replacing an existing unit in a multi-breaker lineup, the busbar spacing and handle-paddle cutouts should align without panel modifications.