Breaking capacity — the number that decides coordination
This MCCB delivers 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.
Above that it derates: 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, and 74 A at 70 °C. Maximum power loss is 19.2 W, which matters for thermal rise calculations in a multi-breaker panel.
Auxiliary switches and shunt trip — what ships inside
The auxiliary switches give remote status of the breaker position (open/closed); the trip alarm signals that the breaker tripped on fault, not manual operation. The shunt trip lets a remote pushbutton or PLC output open the breaker — useful for emergency-stop circuits or interlocking with a fire-alarm panel.