CKJ5 series vacuum AC contactor, which integrates electric vacuum and mechanical electromagnetic switch as one of the vacuum contactor, not only has strong on-off ability, small maintenance amount, arc is not exposed, electric contacts are not affected by atmospheric dust and corrosive gases, stable contact resistance, good explosion-proof performance, safe and reliable, small size, light weight, low noise, long service life; The products are suitable for coal, petroleum, chemical, metallurgy, electric power, machinery, transportation and other fields for controlling three-phase AC motors or other electrical loads.

At present, the existing CKJ5 series vacuum contactor in the market still uses the mechanical switch with exposed arc air as the auxiliary energy-saving switch. Because it breaks the DC current with high voltage, the breaking arc is large, and it is easy to burn the auxiliary energy-saving contacts, resulting in poor contact contact and abnormal starting of the contactor to burn coil load, etc., the operation electrical life is short, and the explosion-proof performance is also poor.

Common faults of vacuum AC contactors

1. The core of CKJ5-400 vacuum contactor cannot close when it is powered on, resulting in a jump. Coil loop capacitor breakdown, resulting in the voltage applied to the maintenance coil is a fluctuating DC, solution: replace the good quality capacitor 1.2uF/1000V

2, CKJ5-400 type vacuum contactor power is not long time (about 20 minutes) coil rectifier loop multiple components burned, causing the vacuum contactor to jump. Through inspection, it is found that the diode structure in the rectifier bridge is surface contact type.