(1) Rated voltage: The rated voltage of a contactor refers to the rated voltage of the main contact. There are 220V, 380V, and 660V for communication, with a rated voltage of up to 1140V for special applications. DC mainly includes 110V, 220V, and 440V.

(2) Rated current: The rated current of a contactor refers to the rated working current of the main contact. It is specified under certain conditions (rated voltage, usage category, operating frequency, etc.), and the commonly used current levels are 10A to 800A.

(3) The rated voltage of the attraction coil is 36V, 127V, 220V, and 380V for AC, and 24V, 48V, 220V, and 440V for DC.

(4) Mechanical and electrical lifespan: Contactors are frequently operated electrical appliances and should have high mechanical and electrical lifespan, which is one of the important indicators of product quality.

(5) Rated operating frequency: The rated operating frequency of a contactor refers to the allowed number of operations per hour, generally 300 times/h, 600 times/h, and 1200 times/h.

(6) Action value: Action value refers to the suction voltage and release voltage of the contactor. When the pull in voltage of the contactor is greater than 85% of the rated voltage of the coil, it should be reliably pulled in, and the release voltage should not exceed 70% of the rated voltage of the coil.

The commonly used AC contactors include CJl0, CJl2, CJ10X, CJ20, CJXl, CJX2, 3TB, and 3TD series.