The Siemens 3VA1110-6EF36-0AG0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries a 100 A continuous rating at 40 °C across all three poles, with a 220 kA interrupting capacity at 240 V AC — that figure drops to 154 kA at 415 V and 121 kA at 440 V, so the voltage level on your bus determines the fault current this breaker can safely clear without upstream coordination issues. Rated insulation voltage is 800 V, which covers standard 480/277 V and 600 V distribution systems with headroom. The 3-pole configuration suits three-phase feeders, and the TM240 thermal-magnetic trip unit provides fixed overload and short-circuit protection curves — no interchangeable trip blocks on this variant.
Current derating and thermal limits
The 100 A rating holds from 40 °C through 50 °C ambient. Above that, the breaker derates: 98 A at 55 °C, 96 A at 60 °C, 94 A at 65 °C, and 91 A at 70 °C. If your panel runs hot — say, a packed enclosure near a furnace line — size the upstream conductor and load for the derated value at your actual ambient, not the 100 A nameplate. Maximum power loss is 25 W, which is typical for a 100 A frame MCCB. That heat has to exit the enclosure; in a sealed stainless steel panel with no fan, check the internal temperature rise against the derating curve above.
Physical fit and mounting
Dimensions are 130 mm high, 76.2 mm wide, and 70 mm deep. That width is three 25.4 mm pole spaces — standard for a 3-pole MCCB on DIN rail or direct panel mount. Depth of 70 mm means it clears a 200 mm deep enclosure with room for wiring gutters.