What this 80 A MCCB does on the line
The Siemens 3VA1180-6EF36-0CH0 is a SENTRON molded case circuit breaker sized for 80 A continuous duty. It's a line-protection device — meaning it sits between the transformer and the distribution bus, not on a motor branch. The TM240 thermal-magnetic release handles overloads and short-circuits up to the breaker's interrupting rating, which hits 220 kA at 240 V and 154 kA at 415 V. That kind of headroom means it can be placed close to a large transformer or high-fault service entrance without worrying about cascading failure upstream. It carries a full 80 A from 40 °C up to 50 °C ambient. Past that, the current starts to step down: 76.8 A at 55 °C, 75.2 A at 60 °C, 73.6 A at 65 °C, and 72 A at 70 °C. If your panel runs hot — say, a crowded enclosure with drives — you'll need to account for that derating curve when sizing the load.
Fit and panel integration
Three-pole, 130 mm tall, 76.2 mm wide, 70 mm deep. The front face carries an IP40 protection class — fine for a closed panel, but not for washdown or outdoor exposure. An undervoltage release (UVR) is built in, and the auxiliary contact configuration comes as 2 auxiliary switches plus a separate trip alarm switch, designated HQ. That gives you two independent status signals and a dedicated alarm contact that changes state only when the breaker trips on a fault, not on manual switching.