Line protection MCCB with shunt trip and auxiliary switches
Interrupting ratings across voltage bands
This MCCB delivers 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at both 500 V and 690 V. The steep drop above 440 V is typical of a high-breaking-capacity frame — at 690 V the 17 kA still covers most industrial motor branch circuits, but for a 690 V main you would want to verify the downstream coordination study.
Current derating with ambient temperature
The breaker holds 125 A continuously from 40 °C up to 50 °C, then derates to 122 A at 55 °C, 120 A at 60 °C, 117 A at 65 °C, and 114 A at 70 °C. If the panel ambient runs above 50 °C — common in a non-ventilated enclosure near a furnace or kiln — the 114 A floor at 70 °C still leaves margin for a 100 A continuous load, but a 125 A load would need the next frame up or forced ventilation.
The shunt trip coil and auxiliary switches are pre-wired to terminal blocks; no additional wiring of internal accessories is needed.