80 A line protection with 121 kA interrupting capacity
The Siemens 3VA1180-4GF46-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 80 A continuous current at 40 °C, configured as a 4-pole line-protection device with a TM240 thermal-magnetic release. Its interrupting rating reaches 121 kA at 240 V and 75.6 kA at 415 V, meaning it can safely clear high-fault currents on industrial distribution without cascading upstream — critical for main or feeder breaker positions where available fault current is high.
The breaker holds 80 A continuously from 40 °C through 50 °C, then derates to 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, and 74 A at 70 °C — a gentle slope that keeps the part usable in warm enclosures without oversizing. Panel footprint is 101.6 mm wide by 130 mm tall by 70 mm deep, which fits standard SENTRON 4-pole MCCB mounting on DIN rail or rear-panel studs. Front protection is IP40, adequate for enclosed switchboards but not for washdown environments.
Maximum power loss is 19.2 W, which should be factored into enclosure thermal calculations. The N-conductor is protected at 100 % rating, meaning the neutral pole is fully rated — not reduced.