80 A MCCB for line protection — TM210 release, 4-pole
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. That 75.6 kA at 415 V is the number most buyers will check first — it clears high-fault industrial distribution boards where the transformer is close. The 121 kA at 240 V matters for 240 V delta or split-phase installations with high available fault current.
Thermal derating and panel fit
The 80 A rating holds from 40 °C through 50 °C — no derating needed in a typical 40 °C panel. 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. Front IP40 means the operator face is protected against tools and wires over 1 mm; the rest of the breaker relies on the enclosure's IP rating. Dimensions: 70 mm deep, 101.6 mm wide, 130 mm tall. That width is standard for a 4-pole MCCB in this frame size — fits common panel cutouts and busbar layouts. The 70 mm depth leaves room for rear-connected busbars or cables without forcing an oversize enclosure.