What it is and what it does
The Siemens SENTRON 3VA2110-5HN32-0AH0 is a 3-pole molded case circuit breaker (MCCB) rated for 100 A continuous current, designed for line protection in distribution panels and motor control centers. It carries a flat thermal derating curve — the full 100 A is available from 40 °C through 70 °C ambient, so no headroom padding needed when the panel runs hot. Interrupting capacity is 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V — covering most low-voltage fault scenarios without cascading upstream.
Physical fit and integration
Dimensions are 181 mm high, 105 mm wide, 86 mm deep — fits standard MCCB panel cutouts and busbar spacing for a 3-pole 100 A frame. Comes with 2 auxiliary switches plus 1 trip alarm switch (HQ type), giving feedback for PLC or status lamp circuits without adding external relay logic. Operating range is -25 °C to 70 °C; storage from -40 °C to 80 °C. Maximum power loss is 10 W — negligible for enclosure thermal calculations.