63 A MCCB with flat thermal curve and high interrupting capacity
What sets this breaker apart is its interrupting capacity: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3 kA at 690 V — figures that give the panel designer real selectivity headroom at common distribution voltages. The thermal curve is flat across the full ambient range: 63 A at 40 °C, 45 °C, 50 °C, 55 °C, 60 °C, 65 °C, and 70 °C, meaning no derating is required up to 70 °C operating ambient. That is unusual for a 63 A frame and simplifies panel thermal calculations.
Dimensions are 181 mm height, 105 mm width, and 86 mm depth. Maximum power loss is 5.4 W, which keeps heat rise manageable in a crowded enclosure.
Auxiliary release and communication
It also carries a communication function, which enables remote monitoring or control integration — useful for a line-protection MCCB in a managed distribution panel. The basic switch supplied is order code 3VA20635JQ320AA0.