The Siemens SENTRON 3VA1180-4EF32-0BC0 is a 3-pole molded case circuit breaker (MCCB) rated for 80 A at 40 °C, with a line-protection design and an undervoltage release (UVR) plus two HQ auxiliary switches built in. Its interrupting capacity hits 121 kA at 240 V AC and still delivers 75.6 kA at 415 V — genuine selectivity headroom for a distribution board feeding motor control centers or lighting panels.
Breaking capacity and thermal derating
The 121 kA at 240 V is the headline number, but the real-world SCCR decision is at the system voltage. At 415 V it still manages 75.6 kA, dropping to 52.5 kA at 440 V and 11.9 kA at 500 V or 690 V — that 11.9 kA floor is still enough for most industrial panel fault levels, but verify your available fault current at the point of installation. Thermal derating is minimal up to 50 °C (still 80 A), then slides to 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, and 74 A at 70 °C. That means a panel at 50 °C ambient gets full rating; above that you lose about 1 A per 5 °C. Rated insulation voltage is 800 V, so the breaker is comfortable in 690 V systems.
Panel fit and integration
Dimensions are 130 mm height, 76.2 mm width, 70 mm depth — a 3-pole MCCB footprint that fits standard Siemens SENTRON mounting plates and panel cutouts. The 21.7 W maximum power loss means the heat load is modest; no forced cooling required in a ventilated enclosure, but account for it in your thermal budget if the panel is densely packed. The undervoltage release (UVR) is factory-fitted, so no field wiring of a separate shunt trip module. Two HQ auxiliary switches are included for status feedback to a PLC or annunciator.