AC contactor is a common control device in the electrical system, which has the function of frequently connecting and cutting off large current circuit. And it can realize the remote control of power distribution system and electric drive system. Although the AC contactor has powerful performance, comprehensive functions and long service life, it will break down like any electronic equipment. Today let the manufacturer of AC contactor teach us how to judge the quality of AC contactor.
We need to prepare a multimeter, whether it is an AC contactor or a DC contactor can be detected with a multimeter. The first method is to test the coil of the AC contactor, put the multimeter in the rx100 gear, and then we test the two terminals of the coil. If the multimeter indicates that the resistance value is 0, it means that the coil is short circuited. If the multimeter indicates that the resistance value is infinite, it means that the AC contactor is open circuited. In either case, it means that the AC contactor has failed and can not be used again due to damage.
The contactor manufacturer tells you that the second detection method is to use a multimeter to detect the contact of the contactor. When the working voltage is normally open, the status of the closed contact is normally open, and the status of the closed contact is normally open without the working voltage being added, and the status of the closed contact is open. If there is any abnormality, it means that the AC contactor is damaged.
The contactor manufacturer tells you the last detection method, which is very simple. It only needs to use a multimeter to measure the insulation resistance of each contact of the AC contactor and between the contact and the terminal. If it is infinite, it means that the insulation performance of the AC contactor is good and can be used normally. Otherwise, it means that the insulation performance of the AC contactor is poor and can no longer be used.