What this MCCB carries — and what it doesn't
The Siemens SENTRON 3VA1080-4ED36-0JC0 is a 3-pole molded case circuit breaker rated 80 A at 40 °C, with a line protection design — meaning it's built for feeder or main breaker duty, not motor protection. Its interrupting rating hits 121 kA at 240 V and still holds 75.6 kA at 415 V, so it handles high-fault panels without cascading upstream. The 800 V rated insulation voltage confirms it's sized for 480 V and 600 V class systems. This variant ships with a shunt trip (STL) release and two HQ auxiliary switches built in — no communication module, no ground-fault monitoring, no undervoltage release. The auxiliary switches are wired for status feedback to a PLC or annunciator; the shunt trip lets a remote E-stop or fire alarm system trip the breaker directly. Power loss runs 19.2 W max at rated load — manageable in a closed panel but worth checking if you're packing breakers tight. Operating temperature spans -25 to 70 °C, storage from -40 to 80 °C.
Interrupting capacity — the real-world numbers
The 121 kA at 240 V is the headline number, but the more useful figure for a 400 V class panel is 75.6 kA at 415 V. At 440 V it drops to 52.5 kA, and at 500 V or 690 V it holds at 11.9 kA. That 11.9 kA at 690 V is still enough for most 690 V distribution, but if your available fault current at that voltage exceeds it, you'll need a current-limiting upstream device or a higher-rated frame.
Thermal derating — what the 80 A means at your panel temp
The breaker holds 80 A continuously from 40 °C through 50 °C. At 55 °C it derates to 78 A, at 60 °C to 77 A, at 65 °C to 75 A, and at 70 °C to 74 A. If your panel ambient runs 50 °C or below, you get the full 80 A; above that, factor the derate into your load calculation.
Panel fit — dimensions and integration
The breaker measures 70 mm deep, 76.2 mm wide, and 130 mm tall. That 76.2 mm width is a 3-pole frame — it occupies three 25.4 mm (1-inch) module positions on a DIN rail or panel-mount plate. The 70 mm depth means it clears most standard enclosure back-panels without interference from the door or busbar stack.
What you get — and what you don't — in this variant
The 3VA1080-4ED36-0JC0 includes a shunt trip (STL) and two HQ auxiliary switches. It does not include an undervoltage release, ground-fault monitoring, a communication module, or a trip indicator. The basic switch supplied is 3VA10804ED360AA0. If you need undervoltage release or ground-fault protection, you'd step to a different suffix in the 3VA1080 family.