What this MCCB is and what the ratings mean for fit
The Siemens 3VA2110-7MS36-0JH0 is a 3-pole SENTRON molded case circuit breaker (MCCB) designed specifically for starter protection — meaning it's built to coordinate with a contactor and overload relay in a motor branch circuit, not just as a feeder breaker. Its rated current holds flat at 100 A across the full operating temperature range from 40 °C to 70 °C, so no derating calculation is needed for a warm panel (–). The adjustable overload range spans 300 A to 1500 A (–), which covers motor FLA from roughly 250 A up to 1200 A depending on the setting and application rules — a wide window that lets one frame size serve multiple motor ratings on the BOM. The interrupting capacity is the headline number that decides whether this breaker clears a fault without upstream damage: 330 kA at 240 V, 242 kA at 415 V and 440 V (–), 187 kA at 500 V, and 3.7 kA at 690 V. At the common 415 V industrial level, 242 kA IC means it can be installed on a transformer secondary with a very high available fault current — typical for large MCC lineups — without needing a current-limiting fuse ahead of it. The steep drop to 3.7 kA at 690 V is a reminder that this is a 600 V class frame; at 690 V the breaker relies on the upstream protection for high faults. The auxiliary switch block carries 2 auxiliary switches plus 1 trip alarm switch (HQ designation), and the auxiliary release is a shunt trip (STL) (–). That means the breaker can signal its status to a PLC and be remotely tripped via a control voltage — standard for E-stop chains and automated restart schemes. The basic switch assembly is order code 3VA21107MS360AA0, which is the replaceable switching mechanism inside the frame.
Panel fit and integration
The MCCB measures 105 mm wide, 181 mm tall, and 86 mm deep (–). That 105 mm width is a standard 3-pole MCCB footprint for this class — it fits a 4-inch (101.6 mm) DIN-rail or panel-mount cutout with minimal adjustment. The 86 mm depth (3.39 in) means it clears a 4-inch deep enclosure with room for rear bus connections. Maximum power loss is 10 W, so inside a sealed panel the heat contribution is modest — no forced ventilation required for a single unit.