The tripping characteristics of circuit breakers are divided into several types, such as A, B, C, D, K, etc., and their respective meanings are as follows:< Type A tripping characteristics: The tripping current is (2-3) In, suitable for protecting semiconductor electronic circuits, measuring circuits with low-power power transformers, or systems with long circuits and low short-circuit currents< Type B tripping characteristics: The tripping current is (3-5) In, suitable for residential distribution systems, protection of household appliances, and personal safety protection< Type C tripping characteristics: The tripping current is (5-10) In, suitable for protecting distribution lines, lighting lines with high connection currents, and motor circuits< D-type tripping characteristics: The tripping current is (10-20) In, suitable for protecting equipment with high impulse current, such as transformers, solenoid valves, etc< K-type tripping characteristics: It has 1.2 times the thermal tripping action current and 8-14 times the magnetic tripping action range, suitable for protecting motor circuit equipment, and has high resistance to impact current