What this MCCB is and what it does
The Siemens 3VA2010-5JQ32-0HC0 is a SENTRON 3VA2 molded case circuit breaker (MCCB) designed for line protection in distribution panels. Rated 100 A continuous at ambient temperatures from 40 °C to 70 °C without derating, it holds its full ampacity across the typical panel environment — no need to oversize for a hot enclosure. Three poles handle three-phase circuits up to 690 V. Breaking capacity reaches 187 kA at 240 V, 121 kA at 415/440 V, 75.6 kA at 500 V, and 3 kA at 690 V — the 240 V figure is the headline for high-fault industrial services; the 690 V rating is the tail, but still covers most motor-circuit fault levels.
Built-in auxiliaries and communication
This variant ships with two auxiliary switches (HQ design) and a shunt trip release (STL). The shunt trip allows remote tripping from a safety relay or E-stop circuit. Communication function is built in — the breaker can report status and accept commands over a bus, though the exact protocol depends on the communication module fitted. Max power loss is 13.5 W, which matters for thermal coordination inside a sealed panel — that's the heat the breaker dumps into the enclosure at full load.
Panel fit and environment
Dimensions are 181 mm high, 105 mm wide, 86 mm deep. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.