What this MCCB is and what it does
The Siemens SENTRON 3VA2110-7MN36-0KA0 is a 3-pole molded case circuit breaker (MCCB) rated for 100 A continuous current at 40 °C, built for motor protection with an ETU350M electronic trip unit and a built-in shunt trip (STL) release. Its interrupting capacity hits 330 kA at 240 V and 242 kA at 415 V — figures that put it in the high-fault tier for industrial panelboards and motor control centers where available fault current runs high. The breaker includes phase failure detection and a voltage trigger, but no auxiliary contacts, no communication module, and no ground-fault monitoring — it's a standalone motor-protection device, not a networked power monitor.
Sizing and thermal derating
The 100 A rating holds flat from 40 °C to 50 °C, then steps down: 96 A at 55 °C, 94 A at 60 °C, 92 A at 65 °C, and 90 A at 70 °C. If your panel ambient sits above 50 °C, you lose 4–10 A of headroom — factor that into the motor FLA. Maximum power loss is 75 W, so the breaker itself dumps heat into the enclosure. In a tightly packed panel, that 75 W adds to the thermal budget and can push the internal ambient up the derating curve.
Physical fit and panel integration
The 3VA2110-7MN36-0KA0 measures 105 mm wide, 181 mm high, and 86 mm deep — a standard SENTRON 3VA frame size that drops into the same DIN-rail or screw-mount footprint as other 100 A 3-pole MCCBs in the series. Operating range spans -25 °C to 70 °C; storage goes from -40 °C to 80 °C. That covers most indoor industrial environments, including unheated warehouses and rooftop enclosures in temperate climates.
Lifecycle and sourcing
The basic switch assembly is order code 3VA2110-7MN36-0AA0, and the integrated auxiliary trip is 3VA9688-0BL33 — both are serviceable subcomponents if you ever need to replace the trip unit or shunt coil without swapping the whole breaker.