What this 80 A MCCB carries and where it fits
The Siemens SENTRON 3VA1140-6GF46-0KF0 is a 3-pole molded case circuit breaker rated 80 A continuous current (Iu) with a TM210 thermal-magnetic overcurrent release. Its interrupting capacity hits 76 kA at 240 V AC, dropping to 53 kA at 415 V, 32 kA at 440 V, and 5 kA at 500 V or 690 V — numbers that tell you this breaker is built for high-fault utility or transformer-fed panels, not light commercial subboards. The 800 V rated insulation voltage (Ui) confirms it can sit on 480 V or 600 V class switchgear with headroom. Line protection version means it's configured for feeder or main breaker duty, not motor circuit protection — no adjustable long-time or instantaneous bands beyond the TM210's fixed thermal/magnetic curve. The front face carries IP40 protection, so it's fine inside a closed panel but not for washdown areas. Width is 3 in, which matches the standard SENTRON 3VA frame footprint for panel cutouts and busbar risers. Integrated auxiliary contacts are a 1 auxiliary switch + 1 trip alarm switch HQ configuration, giving you one N/O or N/C for status feedback and a separate alarm contact that flips only on a trip event. The shunt trip (STL) release allows remote tripping via a control voltage — useful for emergency-stop chains or PLC-driven load shedding. No undervoltage release is fitted, and no communication module is onboard; this is a straightforward power breaker, not a smart metering device.
Thermal derating and real-world current
The 80 A rating holds flat from 40 °C through 50 °C ambient. 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. That's a shallow curve — you lose only 6 A over a 30 °C rise — which means this breaker can live in a warm panel without a big oversize step. If your enclosure ambient runs 65 °C, plan for 75 A continuous load max.
Panel integration and wiring notes
Mounts on a standard DIN rail or panel-mount via the SENTRON 3VA frame's integral latching mechanism. 130 mm height and 3 in width determine the cutout and busbar spacing. Latching endurance is rated at 15,000 operations.