Its interrupting capacity peaks at 220 kA at 240 V, dropping to 154 kA at 415 V, 121 kA at 440 V, and 17 kA at both 500 V and 690 V — the sharp roll-off above 440 V means this breaker is sized for low-voltage distribution where high fault currents are expected, typical in main switchboards or large sub-distribution panels. The 80 A rating holds flat from 40 °C through 50 °C, then derates to 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, and 74 A at 70 °C — a gentle slope that keeps the breaker usable in warm enclosures without oversizing the frame.
At 130 mm tall and 4 in wide, this 4-pole MCCB fits standard US-pattern distribution panels and switchboard mounting — the 4 in width matches typical MCCB cutouts for high-density layouts. An undervoltage release is included, and a motor drive can be added as an optional extension for remote tripping or reset.
Lifecycle and compliance posture
The N-conductor is protected at 100% rating, meaning the neutral pole is fully rated for the same current as the phases — important for 4-wire systems with harmonic loads.