What this MCCB is and what it does
The Siemens 3VA2110-5KP32-0KH0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection — meaning it sits at the feeder or branch level to protect cables and downstream equipment from overloads and short circuits. Rated 100 A continuous across the full ambient range from 40 °C to 70 °C, so no derating headache when the panel runs hot. Three poles, so it's for three-phase systems. Breaking capacity is the headline: 187 kA at 240 V AC, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and still 3.7 kA at 690 V — that covers most industrial distribution voltages without needing a current-limiting fuse upstream.
What the ratings mean for fit
The 100 A frame is the continuous current rating — the breaker will carry 100 A indefinitely without tripping on thermal overload. The 187 kA at 240 V is the maximum fault current it can safely interrupt; if your available fault current at the panel is below that, this breaker clears the fault without welding contacts or rupturing the case. At 415 V and 440 V the 121 kA rating still handles high-fault scenarios common in European and Asian industrial grids. The 3.7 kA at 690 V is lower but still adequate for most 690 V motor circuits where fault currents are typically under 10 kA. The breaker includes a trip indicator and voltage trigger, plus a communication function — likely for remote monitoring or integration with a BMS or SCADA system.
Auxiliaries and integration
This variant comes with two auxiliary switches plus one trip alarm switch (HQ configuration) and a shunt trip release (STL) — so you get remote status indication and remote tripping capability built in. The shunt trip lets a PLC or safety relay kill power to the load without needing a separate contactor. The auxiliary switches can feed back breaker position (open/closed/tripped) to a control system. No undervoltage release on this unit, so if you need UV protection for motor starting, spec the UVR variant instead. Dimensions: 86 mm deep, 105 mm wide, 181 mm tall — standard MCCB footprint for a 100 A frame, fits most panel layouts without surprises.