What this MCCB carries and where it fits
The Siemens 3VA1110-6EF36-0AH0 is a SENTRON molded case circuit breaker (MCCB) in a 3-pole configuration, rated for 100 A continuous current (Iu) with a TM240 thermal-magnetic overcurrent release. Its breaking capacity hits 220 kA at 240 V, 154 kA at 415 V, 121 kA at 440 V, and 17 kA at 690 V — numbers that tell you this breaker is sized for high-fault industrial distribution, not light commercial subfeeds. The 70 mm depth and 76.2 mm width fit standard DIN-rail or panel-mount layouts, and the IP40 front protection means it's fine in a clean indoor enclosure but not for washdown zones.
Thermal derating and what it means for the panel
This MCCB holds 100 A flat from 40 °C through 50 °C ambient. At 55 °C it derates to 96 A, at 60 °C to 94 A, at 65 °C to 92 A, and at 70 °C to 90 A. If your panel ambient runs above 50 °C — say a crowded enclosure with drives or transformers — you need to account for that drop. The 800 V rated insulation voltage (Ui) gives headroom for 690 V line-to-line systems, but the 17 kA SCCR at that voltage is the limiting factor for fault duty. Mechanical endurance is 15,000 cycles, which is standard for a line-protection MCCB in a distribution board that sees infrequent switching.