MCCB with undervoltage release for line protection
The interrupting capacity is 75.6 kA at 240 V, dropping to 52.5 kA at 415 V and 11.9 kA at 690 V, so it handles high-fault scenarios on 400 V-class distribution panels.
Sizing and thermal performance
Above that, it derates gradually: 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 internal ambient — you lose only 2 A off the nameplate. The TM240 thermal-magnetic release is fixed inside, meaning the thermal pickup and magnetic trip thresholds are factory-set. No field adjustment on the trip curve.
It is a straight line-protection device with the undervoltage release as the only auxiliary release.