What this MCCB delivers on the line side
The Siemens SENTRON 3VA2010-5HN36-0CC0 is a 3-pole molded case circuit breaker rated for 100 A continuous current at 40 °C, with an ETU350 electronic trip unit configured for line protection. That 100 A rating holds flat up to 50 °C — above that it derates linearly to 85 A at 70 °C, which matters when the breaker sits in a warm enclosure near other heat sources. The interrupting ratings are the headline: 187 kA at 240 V, 121 kA at 415 V and 440 V, 79 kA at 500 V, and 3.4 kA at 690 V. That 187 kA figure at 240 V means this breaker handles high available fault current on the secondary side of a large transformer without needing a current-limiting fuse upstream — it's sized for main or feeder duty in heavy industrial panels. This version ships with an integrated undervoltage release (UVR) and two HQ auxiliary switches. The UVR trips the breaker when control voltage drops below a set threshold — standard for emergency-stop circuits or undervoltage protection on motor feeders. The auxiliary switches (order code 3VA9608-0BB24) provide status feedback to a PLC or status lamp without an external interlock block. No communication function or ground-fault monitoring is built in, so if you need Modbus or GF protection, you're looking at a different variant in the 3VA2 family.
Panel fit and integration
Dimensions are 105 mm wide, 181 mm high, and 86 mm deep — a standard SENTRON 3VA2 footprint that drops into the same mounting cutout as other 100 A frame MCCBs in the series. The 86 mm depth is the body only; add clearance for the UVR coil and auxiliary wiring at the bottom. Rated insulation voltage is 800 V, so it's suitable for 690 V systems with margin. Operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C. Maximum power loss is 16 W — modest for a 100 A breaker, but factor it into enclosure thermal calculations if you're packing several breakers in a small cabinet.