Siemens 3VA1180-4GE42-0AA0 — 80 A, 4-Pole SENTRON MCCB with TM220 Release
The Siemens 3VA1180-4GE42-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated 80 A continuous at 40 °C, with four poles and a TM220 thermal-magnetic trip unit for line protection. Its interrupting capacity hits 121 kA at 240 V AC, stepping down to 75.6 kA at 415 V and 52.5 kA at 440 V — numbers that matter for high-fault utility feeds or transformer secondaries where SCCR headroom is tight. The TM220 release means the thermal element carries 80 A continuously without nuisance tripping, while the magnetic instantaneous pickup is fixed at a multiple of Iu — typical for motor branch or distribution feeder protection where you need coordination downstream. Rated insulation voltage Ui is 800 V, and the maximum DC operational voltage is 600 V, so this breaker also handles DC bus or battery-string applications within that limit.
Thermal Derating and Panel Fit
The 80 A rating holds flat from 40 °C through 50 °C; above that it derates to 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, and 74 A at 70 °C. If your enclosure ambient runs hot — say a sealed panel next to a furnace line — account for that 6 A loss at the top end. Dimensions are 101.6 mm wide, 130 mm high, 70 mm deep — a 4-pole MCCB that fits standard SENTRON mounting footprints. Front IP40 protection covers the operator interface; no communication module on this variant, so no extra wiring for bus couplers. Maximum power loss is 19.2 W — useful for thermal calculations in a densely packed panel where every watt counts toward the internal temperature rise.