80 A MCCB with thermal-magnetic release — what the ratings mean for your panel
The Siemens SENTRON 3VA1080-3ED32-0AD0 is a 3-pole molded case circuit breaker (MCCB) rated for 80 A continuous current at 40 °C, carrying the full 80 A through 50 °C before the first derate step kicks in at 55 °C (78 A) and down to 74 A at 70 °C. That thermal curve means it holds its full rating across most common panel ambient conditions — you only lose headroom above 50 °C, which is typical for a closed cabinet near process heat. The TM210 thermal-magnetic release handles overload and short-circuit protection without external trip units, keeping the BOM simple for line-protection duty. Breaking capacity is specified at five voltage levels: 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. At 415 V — a common three-phase industrial supply — 52.5 kA puts this breaker comfortably above most distribution fault levels, meaning it can interrupt a bolted fault without upstream fuses needing to clear first. The 7.5 kA at 690 V is the limiting case; if your system runs at that voltage, verify the available fault current stays under that threshold. Rated insulation voltage is 800 V, giving margin above the 690 V maximum operating voltage where breaking capacity is specified. Power loss at rated current is 19.2 W — a figure to factor into enclosure thermal calculations if the panel is densely packed. The breaker ships without undervoltage release, ground-fault monitoring, or communication module; it is a straight thermal-magnetic line-protection device, not a metering or remote-trip breaker.
Panel fit and footprint
Dimensions are 130 mm high, 76.2 mm wide, and 70 mm deep. The 76.2 mm width (3 inches) is the standard 3-pole MCCB footprint for this class — it occupies one 3-module position on a DIN rail or direct-mount plate. Depth at 70 mm means it clears most 200 mm deep enclosures with room for wiring gutters. The auxiliary switch block (3 auxiliary switches HQ) mounts on the side without increasing the pole pitch, so you can add status feedback without widening the footprint. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. If the breaker sits in an unheated warehouse or outdoor cabinet before installation, the storage spec covers winter lows. No trip indicator on the front face — fault indication comes from the auxiliary switch contacts if wired to a PLC or lamp.