Contactor model significance and matters needing attention

1. Choosing a contactor contactor selection of the following points should be paid attention to. ( 1) The rated voltage of load or contact the main contact rated voltage. ( 2) Contact the main contactor's rated current 1 or more. 3 times the rated load current. ( 3) Contactor coil voltage rating. When the circuit is simple, less use electrical appliances, can choose 220 v or 380 v; When the line is complex, use electrical appliances is more or less secure sites, can choose 36 v, 110 v or 127 v. ( 4) Contact number and categories of the contactor shall meet the requirements of control circuit. ( 5) Operating frequency ( Contact on-off times per hour) 。 When on and off current is larger and the on-off frequency in excess of the prescribed value, should choose rated current level of contact ware bigger size. Or you will make contact serious fever, welded together, even cause the motor load, such as lack of phase operation.