What this MCCB covers
The Siemens SENTRON 3VA1180-4GE46-0AA0 is a 4-pole molded case circuit breaker rated for line protection at 80 A continuous current. It carries a TM220 thermal-magnetic release — the thermal element handles overloads, the magnetic element responds to short circuits with an adjustable response value up to 800 A. The interrupting ratings climb to 121 kA at 240 V AC and 75.6 kA at 415 V AC, with 52.5 kA at 440 V and 11.9 kA at both 500 V and 690 V. That spread tells you this breaker is sized for high-fault panels where the available short-circuit current varies by voltage tap.
Current derating and thermal limits
The 80 A rating holds at 45 °C and 50 °C ambient, then steps down to 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, and 74 A at 70 °C. If this breaker sits in a non-ventilated enclosure near heat sources — transformers, drives, or a curing press steam chest — use the 70 °C column for your load calculation. Maximum power loss is 19.2 W, which matters for enclosure heat rise in a sealed panel.
Panel fit and mounting
The breaker measures 101.6 mm wide by 130 mm high by 70 mm deep. It mounts on a DIN rail or can be screw-fixed to a backplate. Front-face protection is IP40 — suitable for a clean panel interior but not washdown. The 4-pole design with 100% N-conductor protection means the neutral pole is fully rated and switches with the phases, which is required for some IT or corner-grounded systems.