What this 80 A MCCB delivers — and where it fits
The Siemens SENTRON 3VA1080-3ED42-0KC0 is a 4-pole molded case circuit breaker (MCCB) rated 80 A at 40 °C, designed for line protection in distribution panels and industrial switchgear. Its interrupting capacity reaches 75.6 kA at 240 V, 52.5 kA at 415 V, and 32 kA at 440 V — figures that cover most low-voltage fault scenarios in commercial and light industrial mains. At 690 V the rating holds at 7.5 kA, so the same breaker can serve a 690 V motor feeder with adequate upstream fault limiting. Rated insulation voltage is 800 V, giving headroom for 690 V systems without creepage concerns.
Thermal derating and real-world current
The breaker holds 80 A continuously up to 50 °C ambient. Above that it derates in steps: 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, and 74 A at 70 °C. If your panel runs hot — say 55 °C inside a sealed enclosure — you lose only 2 A, which is often acceptable for a feeder breaker. For a tight 80 A continuous load, you would want to upsize the frame. Maximum power loss is 19.2 W per pole, which matters for enclosure heat-rise calculations when multiple breakers are ganged.
Built-in accessories and release options
This variant ships with a shunt trip (STL) auxiliary release and two HQ auxiliary switches, so it can be remotely tripped and its status signaled back to a PLC or panel lamp. No undervoltage release is fitted, and there is no ground-fault monitoring module — those would need a different suffix or an add-on accessory. The basic switch inside is 3VA10803ED420AA0, which is the core interrupter assembly; the order code suffix adds the trip unit and accessories.
Physical fit and panel integration
Dimensions are 101.6 mm wide, 130 mm tall, and 70 mm deep — a standard 4-pole MCCB footprint that mounts on a DIN rail or directly to a backplate via the supplied screws. Operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C — fine for unheated warehouses or outdoor enclosures in temperate climates.