What it is and what it does
The Siemens 3VA2110-5MN36-0DH0 is a SENTRON molded case circuit breaker (MCCB) built for motor protection — 3 poles, 100 A continuous current at 40 °C, with an ETU350M electronic trip unit that handles phase-failure detection and a latching endurance of 20,000 operations. Interrupting rating is 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 17 kA at 690 V — so it clears high-fault currents on a 480 V panel without upstream fuses. It includes an undervoltage release (UVR) and auxiliary contacts configured as 2 auxiliary switches plus 1 trip alarm switch HQ, giving you remote status and a safe shutdown on voltage loss.
Mounting and integration
Dimensions are 105 mm wide × 181 mm tall × 86 mm deep — a standard MCCB footprint for a 100 A frame, so it fits a typical DIN-rail or panel-mount enclosure without surprises. Max power loss is 75 W at full load; make sure the enclosure has enough ventilation or forced airflow to keep ambient below 70 °C, where the breaker still carries 90 A.
Thermal derating and real-world fit
Rated 100 A from 40 °C through 50 °C, then derates to 96 A at 55 °C, 94 A at 60 °C, 92 A at 65 °C, and 90 A at 70 °C. If your panel runs hot, you lose 10 A off the top — plan your load margin accordingly. Storage range is -40 °C to 80 °C; operating range is -25 °C to 70 °C — fine for unheated warehouses or outdoor cabinets as long as the breaker isn't running at the low end.