What this MCCB delivers on the line
The Siemens 3VA1180-6EF36-0AA0 is a SENTRON molded case circuit breaker (MCCB) sized for line protection in distribution panels. It carries an 80 A continuous rating at 40 °C through 50 °C, then derates to 74 A at 70 °C — meaning you can run it at full nameplate in most ventilated enclosures without a temperature penalty. The 3-pole design and TM240 thermal-magnetic release handle overload and short-circuit protection in a single device, so it drops right into a standard MCCB slot on the DIN rail or panel-mount footprint.
Interrupting capacity — the number that governs selectivity
This MCCB's interrupting capacity changes sharply with system voltage. At 240 V it clears 220 kA — enough for high-fault utility feeds. At 415 V it's 154 kA, at 440 V it's 121 kA, and at 500 V or 690 V it drops to 17 kA. That 17 kA figure at 480/600 V class is the practical limit for most industrial panels; if your upstream transformer can deliver more fault current at those voltages, you need a higher-rated frame upstream or a current-limiting fuse ahead of this breaker. The rated insulation voltage of 800 V confirms it's built for 690 V systems with margin.
Panel fit and thermal management
The 3VA1 frame measures 130 mm high, 76.2 mm wide, and 70 mm deep — a compact 3-pole footprint that fits standard distribution panel cutouts. Maximum power loss is 19.2 W, so in a sealed enclosure with multiple breakers side-by-side, you'll want to check the cumulative heat load against the cabinet's dissipation rating. Front-face protection is IP40, meaning tools and fingers are kept out but the unit isn't sealed against moisture — indoor panel use only.