The Siemens SENTRON 3VA1080-4ED42-0AD0 is a 4-pole molded case circuit breaker (MCCB) rated for 80 A continuous current at 40 °C, using the TM210 thermal-magnetic overcurrent release. It's built for line protection — feeder circuits, distribution panels, and main incomers in industrial and commercial installations. The 4-pole design covers three-phase plus neutral, or two-phase plus two-pole DC applications where the neutral needs protection. Breaking capacity is the headline: 121 kA at 240 V AC, 75.6 kA at 415 V, 52.5 kA at 440 V, and still 11.9 kA at 690 V.
At 55 °C it drops to 76.8 A, at 60 °C to 75.2 A, at 65 °C to 73.6 A, and at 70 °C to 72 A. If the breaker sits near transformers or in a sealed enclosure above 50 °C, apply the derating curve. The 70 mm depth leaves room for rear-connected busbars or cables without forcing an oversize enclosure.