The Siemens SENTRON 3VA1080-2ED36-0BC0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection — the core job is clearing fault currents fast while handing continuous load. It's sized for 80 A at 40 °C ambient, with a published derating curve that holds 80 A through 50 °C, then steps down to 74 A at 70 °C. That thermal curve matters if this breaker sits near other heat sources in a tightly packed panel. Breaking capacity is 52.5 kA at 240 V, 32 kA at 415 V, and 7.5 kA at 690 V — these are the fault-clearing limits the breaker can interrupt without welding contacts or venting arc gas into the enclosure. For a 415 V industrial feed, 32 kA covers most transformer-backed fault levels; at 690 V the 7.5 kA rating still handles downstream faults on a motor-drive bus.
Physical fit: 70 mm deep, 76.2 mm wide, 130 mm tall. The 76.2 mm width (3 inches) is the standard MCCB footprint on a DIN rail or backplate — it occupies three 25 mm module spaces in a panel layout. Depth of 70 mm leaves room for wiring gutters behind the breaker on a standard 200 mm deep enclosure. This variant ships with an undervoltage release (UVR) factory-installed and two HQ auxiliary switches. The UVR will trip the breaker if control voltage drops below its dropout threshold — common on safety circuits or emergency-stop chains where loss of control power must open the main contacts. The two auxiliary switches provide status feedback (open/closed) to a PLC or indicator lamp without external interposing relays.