What it is and what it does
The Siemens SENTRON 3VA1080-2ED42-0AF0 is a 4-pole molded case circuit breaker (MCCB) rated for line protection. It carries a rated continuous current Iu of 80 A and a rated insulation voltage Ui of 800 V. The overcurrent release is a TM210 thermal-magnetic type — that means the thermal element handles overloads, the magnetic element handles short-circuits, and the 210 designation indicates the magnetic trip threshold is 10× Iu (800 A). No undervoltage release, no ground-fault monitoring, no communication function: this is a straight line-protection breaker, not a multifunction device. Breaking capacity climbs with system voltage: 52.5 kA at 240 V, 32 kA at 415 V, 13.6 kA at 440 V, and 7.5 kA at 690 V. At 415 V, that 32 kA covers most industrial distribution panels in common low-voltage networks — enough to clear a fault without upstream coordination headaches. The 690 V figure matters for 690 V line supplies (some mining, marine, or heavy industrial plants).
Thermal derating — what the current numbers mean
The breaker holds a full 80 A from 40 °C through 50 °C ambient. Above that, it derates: 76.8 A at 55 °C, 75.2 A at 60 °C, 73.6 A at 65 °C, and 72 A at 70 °C. That is a shallow derating curve — only 10 % loss from 40 °C to 70 °C — so it runs near its nameplate in a warm panel. The TM210 release does not need external adjustment; the thermal element self-compensates. Operating range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.
Panel fit and aux contacts
Dimensions: 101.6 mm wide, 130 mm high, 70 mm deep. That 101.6 mm width is a standard 4-pole MCCB footprint — it occupies four 25.4 mm (1-inch) module positions on a DIN rail or panel-mount base. The 70 mm depth keeps it clear of most gland plates and backpanel wiring troughs. IP40 on the front means it is protected against tools and wires larger than 1 mm, but not against water ingress — keep it inside a closed enclosure. Comes with one auxiliary switch and one trip alarm switch (HQ type). The auxiliary switch follows the breaker position; the trip alarm signals only on a fault trip, not on manual switching. That is useful for remote indication — the alarm contact can trigger a PLC input or a panel light when the breaker clears a fault. No additional auxiliary release is fitted, but the HQ contact block is factory-integrated.