MCCB for motor starter protection — 100 A continuous, 220 kA interrupting at 240 V
The Siemens SENTRON 3VA1110-6MH36-0BC0 is a 3-pole molded case circuit breaker (MCCB) designed specifically for starter protection — meaning its trip curve is shaped to coordinate with motor starting inrush while still providing short-circuit protection for the downstream contactor and overload relay. Rated 100 A continuous at ambient temperatures up to 50 °C without derating; above that it steps down to 98 A at 55 °C, 96 A at 60 °C, 94 A at 65 °C, and 91 A at 70 °C — so if the panel runs hot, the usable current drops, and that derated figure is what governs the motor full-load amp selection. Breaking capacity varies sharply with system voltage: 220 kA at 240 V, 154 kA at 415 V, 121 kA at 440 V, and 7.5 kA at both 500 V and 690 V. At the higher voltages the fault-current capability is much lower — verify the available fault current at your system voltage before committing the BOM line.
Built-in undervoltage release and auxiliary switch complement
This MCCB ships with an undervoltage release (UVR) factory-installed — the UVR trips the breaker when supply voltage drops below a threshold, which is standard for motor starter circuits where you want automatic disconnection on brownout or phase loss. It also carries two factory-fitted auxiliary switches (HQ design) for remote status indication — one normally-open and one normally-closed contact per switch, giving four signal paths total to the PLC or panel指示灯. The basic switch core is order code 3VA11106MH360AA0 — useful to know if you ever need to order the bare switch assembly separately for a repair rather than replacing the whole breaker.
Panel fit and environmental limits
Dimensions are 130 mm height, 76.2 mm width (3 inches — standard MCCB footprint for a 3-pole frame), and 70 mm depth. The width matches the common 3-inch-per-pole spacing, so it drops into existing SENTRON mounting bases without panel modification. Rated insulation voltage is 800 V, so it's suitable for 690 V systems with margin. Operating temperature range is -25 °C to +70 °C; storage range is -40 °C to +80 °C. Maximum power loss at rated load is 27.5 W — factor that into enclosure thermal calculations if the panel is densely packed.