Siemens SENTRON 3VA1080-4ED42-0CH0 — 80 A MCCB with Undervoltage Release
The Siemens SENTRON 3VA1080-4ED42-0CH0 is a 4-pole molded case circuit breaker (MCCB) rated 80 A at 40 °C, designed for line protection in distribution panels. It carries a breaking capacity of 121 kA at 240 V, stepping down to 75.6 kA at 415 V and 52.5 kA at 440 V — figures that matter when you're sizing for fault current at the secondary side of a transformer or a low-impedance bus. The thermal rating holds flat at 80 A up through 50 °C, then derates to 74 A at 70 °C, so it's usable in a warm enclosure without oversizing the frame. This variant ships with an integrated undervoltage release (UVR) and two auxiliary switches plus one trip alarm switch (HQ), factory-installed. The UVR means the breaker trips instantly on loss of control voltage — useful for emergency-stop circuits or safety-related disconnect where you want the load isolated when the control supply drops. Power loss at rated load is 21.7 W, which matters for thermal budgeting inside a sealed panel.
Breaking Capacity Across Voltages
The 3VA1080-4ED42-0CH0 delivers 121 kA at 240 V AC, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V. Compare that to the 3VA1110-5EF32-0AM0 — a 100 A frame that shares the same SENTRON platform but steps up the thermal rating while the breaking curve at the higher voltages is similar. For a 400 V distribution board where the available fault current is around 50 kA, this breaker has headroom; for a 690 V motor control center with high fault levels, the 11.9 kA rating is the hard limit.
Panel Fit and Mounting
Dimensions are 130 mm height, 101.6 mm width, 70 mm depth — a compact 4-pole footprint that fits standard Siemens SENTRON mounting plates or DIN-rail adapters. The 70 mm depth means it clears most 200 mm-deep enclosures with room for wiring gutters. The auxiliary switch block (2 aux + 1 alarm) adds about 9 mm to the depth; verify clearance if the panel is tight.