Siemens SENTRON 3VA1080-3ED32-0HC0 — 80 A MCCB for Line Protection
The Siemens SENTRON 3VA1080-3ED32-0HC0 is a 3-pole molded case circuit breaker (MCCB) rated for 80 A at 40 °C, designed specifically for line protection in distribution panels. It carries a breaking capacity of 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 — the SCCR drops sharply above 440 V, so verify the available fault current at your system voltage before specifying. The 800 V rated insulation voltage gives headroom for 480/277 V and 600 V installations. This MCCB includes a shunt trip (STL) auxiliary release and provisions for two HQ auxiliary switches, but no undervoltage release, ground-fault monitoring, or communication function. It is a straightforward thermal-magnetic breaker for feeder or branch-circuit protection where remote tripping via the shunt trip is required.
Thermal Derating and Panel Fit
The 80 A rating holds from 40 °C through 50 °C, then derates to 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, and 74 A at 70 °C. In a sealed panel with ambient above 50 °C, plan for the reduced continuous current. The 70 mm depth, 76.2 mm width, and 130 mm height fit standard MCCB mounting footprints; verify the cutout against your existing panel layout. Maximum power loss is 19.2 W — account for this in the panel thermal budget, especially when breakers are ganged without spacing. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.