What this MCCB is and what it does
The Siemens SENTRON 3VA2110-5JQ32-0DC0 is a 3-pole molded case circuit breaker (MCCB) for line protection. Its full-scale current is 100 A, and it carries that rating from 40 °C to 70 °C. The interrupting ratings climb to 187 kA at 240 V, drop to 121 kA at 415 V and 440 V, then to 75.6 kA at 500 V, and settle at 3.7 kA at 690 V. That 187 kA figure at 240 V puts it in the high-fault tier for North American 240/120 V panelboards; the 121 kA at 415 V covers most European industrial distribution bus faults. The 3.7 kA at 690 V is a tail-off — this breaker is not sized for 690 V main service, but it will clear a fault on a 690 V subfeed if the available fault current is low.
Built-in auxiliary and undervoltage release
This order code ships with an undervoltage release (UVR) factory-fitted, plus two auxiliary switches (HQ type). The UVR trips the breaker when control voltage drops below a threshold — standard for safety circuits that need to drop power on loss of control supply. The two auxiliary switches give remote status (open/closed/tripped) without adding a separate accessory module. A communication function is also present on this variant, meaning it can integrate with a BMS or PLC over the SENTRON communication bus for metering and remote trip indication. Physical footprint: 105 mm wide, 181 mm tall, 86 mm deep. The 105 mm width is standard for a 3-pole 100 A frame.