Siemens 3VA1080-3ED42-0BC0 — 80 A SENTRON MCCB, line protection, 4-pole
The Siemens 3VA1080-3ED42-0BC0 is a 4-pole molded case circuit breaker (MCCB) from the SENTRON series, designed for line protection in distribution panels. 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. The 800 V rated insulation voltage gives headroom for 690 V systems where the breaker still clears 7.5 kA. 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. Power loss at full load is 21.7 W, which factors into the enclosure's thermal budget. 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.
Mounting and integration
Dimensions: 130 mm height, 101.6 mm width, 70 mm depth (–). The 70 mm depth is the projection from the mounting surface — check gland-plate clearance in a shallow enclosure. 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.