01 March 2021
What is the meaning of the B, C, D, K and Z curves for C60 Multi-9 circuit breakers?
Applies to the ac rated C60 Acti-9 devices
For C60 Acti-9 devices, ac rated, the following is the meaning of the trip curves:
B curve: 3 - 5 times amp rating for IEC
C curve: 7 - 10 times amp rating
D curve: 10 - 14 times amp rating
K curve: 10 - 14 times amp rating
Z curve: 2 to 3 times amp rating
Trip curves are included in the CA908024E catalog.