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Replace contacts on installed EH/EK contactor Replace all main contacts at the same time EH 100…300 1) Remove the arc chute. 2) Push the moving contact sideways. Raise the contacts slightly so that the contacts slide out. 3) Replace the static contact. 4) Replace the moving contact.    EH 370...800 1) Remove the arc chute. 2) Press down and push out the arcing contacts sideways, see Figure 1 for details. 3) Take out the main contact: Pry the corresponding contact clip upwards, push the main contact to the neutral position, see Figure 2, and take out the main contact. 4)...

To determine the degree of electrical wear of the contacts Whether from a functional or an economic point of view, it is necessary to determine the degree of wear of the contacts. Maintaining the contactor too early will increase the total cost, and it is more economical to maintain the contactor at the appropriate time to avoid equipment interruption or accident.  Longitudinal Different application categories, different load contact wear rates are different. For motor control, it is also related to the starting method of the motor. Some of the commonly used application categories are listed below.  AC-1. (General purpose) Non-inductive...

Maintenance of main contactsIf only the surface of the contact is rough and discolored, the contact is not damaged or completely worn at this time. In the picture below, the contacts look worse, but experience tells us that the contacts below are better than a new set. This is because the contacts are "electrically aligned" and the entire contact surface is in full contact. Based on this, it may be completely wrong to judge whether the contact needs to be replaced based only on the appearance of the contact surface.Grinding contactsToday, with the development of contact materials and the improvement...