Air switch c is the classification of circuit breakers. The trip characteristics (curves) commonly used in the world are: A, B, C and D trip characteristics.
A features: 2 times rated current, rarely used, generally used for semiconductor protection;
B characteristics: 2~3 times the rated current, generally used for transformer side secondary circuit protection;
C characteristics: 5~ 10 times the rated current, which is the most commonly used, generally used for building lighting electricity, etc.
D characteristics: 10~20 times the rated current, generally used for power distribution.