What this MCCB is and what it does
The Siemens 3VA2110-5JQ32-0AE0 is a SENTRON molded case circuit breaker (MCCB) rated for line protection in a 3-pole configuration. It carries a 100 A frame (adjustable from 20 A initial to 100 A full-scale) and delivers a 187 kA interrupting capacity at 240 V AC, dropping to 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V. That 187 kA figure at 240 V means it can safely clear a fault of that magnitude without upstream coordination issues — critical for high-fault-capacity service entrances or industrial distribution panels where the available short-circuit current is substantial. The breaker includes a communication function and is equipped with 4 auxiliary switches (HQ design) plus a basic switch (order code 3VA21105JQ320AA0). Ground-fault monitoring is implemented via summation current formation on the L-conductor. This makes the unit suitable for integration into monitored distribution systems where remote status and fault indication are required.
Thermal performance and derating
The breaker is rated for a continuous 100 A across the full ambient temperature range from 40 °C to 70 °C — no derating required within that band. Maximum power loss is 10 W. Operating temperature spans -25 °C to 70 °C, with storage from -40 °C to 80 °C. For a panel builder, this means the unit can be mounted in a warm enclosure without needing to down-rate the frame size, as long as the internal ambient stays within that 70 °C ceiling.
Physical integration and mounting
Dimensions are 181 mm height, 105 mm width, and 86 mm depth. The 105 mm width is standard for a 3-pole MCCB in this class, fitting common panel cutouts and DIN-rail adapter plates. The 86 mm depth means it clears most shallow enclosure back-panels without protruding into wiring gutters. No undervoltage release or voltage trigger is fitted on this variant.