Line protection MCCB with 75.6 kA interrupting rating
Breaking capacity is 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 10.5 kA at 690 V — the 240 V figure is the headline interrupting rating, sufficient for high-fault utility feeds in commercial and light industrial panels.
Thermal derating and ambient limits
Above that, derating is linear: 15.36 A at 55 °C, 15.04 A at 60 °C, 14.72 A at 65 °C, and 14.4 A at 70 °C. If the enclosure ambient exceeds 50 °C, the breaker must be derated per the table — a common oversight in non-ventilated cabinets.
Physical fit and auxiliary contact configuration
This unit ships with 4 auxiliary switches (HQ type) pre-installed, providing status feedback for remote monitoring or PLC inputs. Front protection is IP40 — suitable for dry indoor panels; not rated for washdown environments.