What this MCCB is and what it does
The Siemens 3VA1110-5MH32-0JC0 is a SENTRON molded case circuit breaker (MCCB) designed specifically for starter protection — meaning its trip curve and auxiliary-switch complement are set up for motor-starting duty rather than straight feeder protection. It carries a full-load current rating of 100 A at 40 °C, and that rating holds flat through 50 °C before a gentle derating curve begins: 98 A at 55 °C, 96 A at 60 °C, 94 A at 65 °C, and 91 A at 70 °C. The 3-pole frame occupies a 76.2 mm wide footprint on the DIN rail, with a depth of 70 mm and height of 130 mm. Breaking capacity is voltage-dependent, as you'd expect on a high-interrupting MCCB: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 7.5 kA at both 500 V and 690 V. That 187 kA figure at 240 V puts it in the high-fault category for North American panelboards fed from a large transformer. The rated insulation voltage is 800 V, giving headroom for 690 V systems. This variant ships with a shunt trip (STL) auxiliary release and two HQ auxiliary switches built in — no undervoltage release, no ground-fault monitoring, no communication module. The shunt trip lets you remotely trip the breaker via a control signal, which is typical for emergency-stop circuits or supervisory PLC override. Maximum power loss is 25 W, so factor that into enclosure thermal calculations.
Panel fit and integration notes
The 76.2 mm width (3 inches) matches the standard 3-pole MCCB footprint on a DIN rail. Depth of 70 mm (2.76 in) and height of 130 mm (5.12 in) are typical for this frame class.