What this MCCB is and what it does
The Siemens SENTRON 3VA1110-6EF36-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated 100 A at 40 °C, with a TM240 thermal-magnetic overcurrent release designed for line protection — meaning it sits on a feeder or main distribution circuit, not a motor branch. The 220 kA breaking capacity at 240 V is the headline number: it clears high-fault currents on a 240 VAC service without the breaker welding or venting plasma into the panel. At 415 V the rating drops to 154 kA, still well above typical utility fault levels. The 70 mm depth and 76.2 mm width fit a standard 3-pole MCCB footprint on a DIN rail or panel-mount base.
Current derating and thermal limits
The 100 A rating holds flat from 40 °C to 50 °C. Above that it derates: 98 A at 55 °C, 96 A at 60 °C, 94 A at 65 °C, 91 A at 70 °C. If the panel ambient runs hot — say near a transformer or in a non-conditioned enclosure — the real continuous current is the derated figure, not the label. The maximum power loss is 25 W, which matters for enclosure ventilation when several breakers are ganged.
Panel fit and environment
The breaker measures 130 mm high, 76.2 mm wide, 70 mm deep. The front face carries IP40 protection — fine for a dry indoor panel, but not for washdown or outdoor exposure. The TM240 release is a fixed thermal-magnetic type; no ground-fault monitoring, no undervoltage release, no communication module on this variant. It's a straight line-protection breaker: bolt it in, land the conductors, set the thermal dial if adjustable (the TM240 is fixed), and close the cover.