The Siemens SENTRON 3VA1110-3EF36-0AG0 is a 3-pole molded case circuit breaker rated for 100 A continuous current (Iu) with a TM240 thermal-magnetic trip unit, built for line protection in distribution panels. It carries a 75.6 kA breaking capacity at 240 V, stepping down to 52.5 kA at 415 V and 32 kA at 440 V — numbers that tell you it handles high-fault utility feeds without cascading upstream. The 70 mm depth and 76.2 mm width fit standard MCCB panel cutouts, and the front face is IP40 rated, so it's fine for enclosed switchboards but not for washdown areas.
Thermal derating and trip curve
The 100 A rating holds flat from 40 °C up to 50 °C. Above that it derates: 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 runs hot, size the load accordingly — the breaker won't nuisance-trip, but the continuous current limit drops. The TM240 thermal-magnetic trip has a fixed time delay tr max of 1 s, so it coordinates with downstream feeders on moderate overloads.
Panel fit and integration
At 76.2 mm wide and 70 mm deep, this breaker drops into a standard 3-pole MCCB slot. The front IP40 rating means it's protected against solid objects larger than 1 mm but not against water ingress — keep it inside a closed panel. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C, so it handles cold warehouses and hot shipping containers without issue.