What it is and what it does
The Siemens 3VA1080-3ED36-0DC0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries a rated current of 80 A at 40 °C, with minimal thermal derating up to 70 °C — still delivering 74 A at that ceiling. That thermal stability matters when the breaker sits in a crowded enclosure; you don't lose a lot of headroom as ambient climbs. Three-pole configuration, rated insulation voltage of 800 V, and a short-circuit breaking capacity that varies by system voltage: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at both 500 V and 690 V. For a 415 V industrial feeder, that 52.5 kA SCCR gives real selectivity headroom against a downstream 25 kA MCCB — you can coordinate without oversizing the main. This unit ships with an undervoltage release (UVR) integrated and two auxiliary switches HQ. No ground-fault monitoring, no communication module — it's a straightforward line-protection breaker for standard power distribution, not a smart metering or GFCI variant.
Physical fit and panel integration
Dimensions: 70 mm depth, 76.2 mm width, 130 mm height. That's a standard SENTRON 3VA form factor — it occupies the same footprint as other 3VA frame breakers. If you're swapping into an existing panel that was built around a 3VA1010 or similar, the mounting hole pattern and bus-bar spacing are identical; no re-drilling or re-bussing needed. The 76.2 mm width is three 25.4 mm pole pitches, so it aligns with standard 25 mm bus-bar centers. Maximum power loss is 21.7 W. In a sealed, non-ventilated enclosure, that heat has to be factored into the thermal budget — but for a panel with natural convection, it's manageable. The storage temperature range of -40 °C to 80 °C and operating range of -25 °C to 70 °C cover most indoor industrial environments.