Siemens 3VA1080-3ED42-0BC0 — 80 A SENTRON MCCB, line protection, 4-pole
Rated 80 A at 40 °C, it carries a breaking capacity of 75.6 kA at 240 V AC and 52.5 kA at 415 V AC — figures that govern its fault-interruption capability on standard low-voltage mains. Thermal derating is flat from 40 °C to 50 °C (80 A), then drops to 78 A at 55 °C and 74 A at 70 °C (–). For a panel running at 55 °C ambient — common in a crowded enclosure — the breaker delivers 78 A continuous without nuisance tripping. This MCCB includes an undervoltage release and two HQ auxiliary switches. No communication module or ground-fault monitoring is fitted. The trip indicator is absent, so visual status comes from the auxiliary switch contacts wired to a PLC or panel lamp.
Breaking capacity across voltages — what it means for panel design
The 3VA1080-3ED42-0BC0's interrupting rating drops with 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 (–). On a 415 V distribution board with a prospective short-circuit current of 50 kA, this breaker clears it. At 690 V the same unit only handles 7.5 kA — verify the available fault current before specifying on 690 V supplies.
Dimensions: 130 mm height, 101.6 mm width, 70 mm depth (–). Four-pole form factor occupies the same footprint as a standard SENTRON 4P MCCB; no special cutout needed if the panel already accepts 3VA frame breakers.