MCCB for line protection with high interrupting capacity
The 3-pole construction suits three-phase systems up to 800 V rated insulation voltage. What sets this MCCB apart is the interrupting capacity: 220 kA at 240 V AC, 154 kA at 415 V, 121 kA at 440 V, and still 17 kA at 690 V.
The breaker carries 40 A continuously from 40 °C through 50 °C (–), then derates to 39 A at 55 °C and 60 °C, 38 A at 65 °C, and 37 A at 70 °C. The dimensions are 130 mm height, 76.2 mm width, and 70 mm depth; the 70 mm depth is the front-to-back dimension, which matters when fitting into a shallow gland plate or a compact panel. Maximum power loss is 10.8 W at full load, which adds to the enclosure heat budget.