What this MCCB is and what it does
The Siemens SENTRON 3VA2010-5JQ32-0CC0 is a 3-pole molded case circuit breaker (MCCB) rated for 100 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. It is designed for line protection in distribution panels and switchgear, with a breaking capacity of 187 kA at 240 V AC, stepping down to 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3 kA at 690 V. That 187 kA figure at 240 V means it can safely interrupt very high fault currents typical at the service entrance of large industrial facilities, protecting downstream equipment from cascading failure.
Key ratings and what they mean for fit
The breaker carries a continuous current rating of 100 A, with a minimum setting of 150 A and a maximum of 1 200 A — the adjustable thermal-magnetic trip unit lets you dial in the exact protection curve for the downstream load. The undervoltage release (UVR) is built in, so the breaker trips automatically if supply voltage drops below a threshold, which is common in safety circuits or motor control centers where loss of control voltage must open the main disconnect. Two auxiliary switches (HQ design) are fitted for remote status indication. Communication function is present, allowing integration with a building management or SCADA system for remote monitoring and trip logging.
Panel integration and mounting
The MCCB measures 105 mm wide, 181 mm high, and 86 mm deep — a standard footprint for SENTRON 3VA frame sizes. It mounts on a DIN rail or can be screw-fixed to a backplate in the enclosure. The 86 mm depth leaves clearance for wiring and busbar connections behind the panel door; verify gland plate depth if the breaker sits near the rear wall. Power loss is 16 W maximum at rated current, so ventilation in a sealed enclosure should account for that heat.