The 63 A rating holds across 40–50 °C ambient, then derates to 58 A at 70 °C — useful to know if the breaker sits near other heat sources in a crowded enclosure. Breaking capacity reaches 121 kA at 240 V and 75.6 kA at 415 V, so it handles high-fault scenarios on the secondary side of a step-down transformer or a large motor control center bus.
Breaking capacity by voltage — matching the fault level at your bus
This MCCB's interrupting rating varies with system voltage: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V.
Auxiliary and undervoltage release — what ships inside
Factory-fitted with two auxiliary switches (HQ design) and an undervoltage release (UVR).
Dimensions are 130 mm height, 101.6 mm width, 70 mm depth — a standard 4-pole MCCB footprint for DIN-rail or screw-mount installation in a distribution board. The 70 mm depth leaves clearance behind the gland plate for wiring tunnels.