Part identification and design intent
Breaking capacity is rated at 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 690 V. These figures define the fault-clearing capability at the respective system voltages — important for selectivity studies and SCCR compliance in a distribution panel.
The breaker holds full 80 A rating through 50 °C. Above that, current must be derated: 76.8 A at 55 °C, 75.2 A at 60 °C, 73.6 A at 65 °C, and 72 A at 70 °C. The derating curve governs panel fill factor and spacing — a tightly packed enclosure with elevated internal temperature will require a larger frame or forced ventilation.
Dimensions are 130 mm height, 76.2 mm width (roughly 3 inches — fits standard 3-pole MCCB footprint), and 70 mm depth. Front protection is IP40. The 3VA frame mounts via screw-clamp to a backplate or DIN rail adapter (not integrated). The undervoltage release coil and auxiliary switch wiring terminate on the front-accessible terminals; verify free-wheel diode polarity on the UVR if driven by a PLC digital output.