At 415 VAC the interrupting rating is 75.6 kA, and at 690 VAC it holds at 11.9 kA, so the breaker's SCCR (short-circuit current rating) is voltage-dependent; the buyer must match the available fault current at the point of installation. 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 (–). For a panel running warm — say 55 °C ambient — the breaker still carries 78 A continuous, so a full 80 A load would need a one-size-up frame.
That 76.2 mm width is three standard 25.4 mm module spaces on a DIN rail — a 3-pole MCCB occupying exactly three 1-inch slots.
What the auxiliary switch complement means for the controls engineer
The breaker ships with two auxiliary switches and one trip alarm switch. The two aux contacts provide status feedback (open/closed) to a PLC or indicator lamp; the trip alarm switch signals a fault trip separately from a manual open. This is the HQ variant — high-quantity auxiliary switch block — which gives more feedback points than the standard single-aux configuration.