The Siemens SENTRON 3VA1180-4EF36-0KC0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection — the primary overcurrent safeguard on a feeder or distribution branch. It's built around an 80 A frame at 40 °C, with a breaking capacity of 121 kA at 240 V AC, stepping down to 75.6 kA at 415 V and 11.9 kA at 690 V. That's a serious interrupting rating for a compact 3-pole unit; you'd spec this where available fault current is high and you need the breaker to clear without welding contacts or cascading upstream.
Thermal derating and panel fit
The 80 A rating holds flat from 40 °C to 50 °C, then drops to 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, and 74 A at 70 °C. If your panel ambient runs above 50 °C — say, a sealed enclosure near a furnace line — you lose about 6 A by 70 °C. Plan the load accordingly; the breaker won't trip early, but the continuous current you can pass is the derated figure, not the nameplate 80 A. Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep. That 70 mm depth is the key fit number for a shallow gland plate or a backpanel with limited clearance behind the DIN rail. The 76.2 mm width (3 in) is a standard 3-pole MCCB footprint — it'll slot into most SENTRON distribution blocks without forcing a busbar rework.
Auxiliary and release options
This variant ships with a shunt trip (STL) release and two HQ auxiliary switches. The shunt trip lets you remotely trip the breaker from a safety PLC or emergency-stop circuit — useful for a controlled shutdown on a conveyor or pump line. The two auxiliary switches give status feedback (open/closed/tripped) back to the control system. No undervoltage release on this order code, so if you need UVR for a machine-start interlock, this isn't the variant. Rated insulation voltage is 800 V, and maximum power loss is 19.2 W. That 19.2 W is the heat you need to vent in a sealed enclosure — not trivial if you're stacking several breakers in a row.