What the ratings mean for your panel
The Siemens 3VA1110-3EF32-0KA0 is a 3-pole SENTRON molded case circuit breaker rated 100 A at 40 °C, with a TM240 thermal-magnetic overcurrent release and an integrated shunt trip (STL) for remote tripping. The 75.6 kA breaking capacity at 240 V tells you it can safely interrupt a fault current of that magnitude without upstream devices needing to clear it — critical for high-fault panels near large transformers or motor control centers. At 415 V the breaking capacity is 52.5 kA, dropping to 11.9 kA at 690 V, so verify the available fault current at your system voltage before specifying. The 100 A rating holds steady through 50 °C, then derates to 98 A at 55 °C, 96 A at 60 °C, 94 A at 65 °C, and 91 A at 70 °C. If your enclosure runs hot — say a packed panel with drives — size the breaker for the actual ambient, not the nameplate. The 800 V rated insulation voltage gives headroom for 690 V systems.
Footprint and panel integration
At 130 mm high, 76.2 mm wide, and 70 mm deep, this MCCB fits standard SENTRON 3VA mounting footprints. The 70 mm depth is the dimension from the mounting surface to the front of the breaker — relevant when planning gland-plate clearance or door clearance on a 200 mm deep enclosure. The 25 W maximum power loss at rated load should be factored into your thermal budget, especially in a sealed cabinet.