The difference between contactor and relay

Relays and contactors, their working principle is basically similar, the main role of the relay is the signal detection, transmission, conversion or processing, it is usually smaller circuit current is off, the main role of the contactor is used to connect or Disconnect the main circuit. As the frequency of use of these two types of products increases, the distinction between relays and contactors needs to be more explicit.

Difference between relay and contactor:

1, the contact capacity of the relay generally does not exceed 5A, the contact capacity of the small relay is generally only 1A or 2A, and the contactor's contact capacity is also the smallest 10A to 20A;

2, the relay coil has DC and AC points, and the contactor coil only AC;

3, the contacts of the contactor usually have three main contacts and several auxiliary contacts, and the contacts of the relay are generally divided into main and auxiliary;

4. The contacts of the relay are sometimes set in pairs, that is, the normally open contacts and the normally closed contacts are combined together, and the relays generally have the main contacts that are normally open contacts and will not be set in pairs;

5, relays for specific requirements, will be combined with other devices designed into time relays, pressure relays, etc., have additional features, and contactors generally do not have additional features;

The selection of the relay and contactor operation can be judged according to the current of the circuit. If the operating current is relatively small, the normally used relay can be used as the device for switching the main circuit. If the current is too large, the contactor can be selected because of the capacity of the contactor. Very large, the general relay may not have a control circuit. For production, product selection is not suitable, which will greatly affect production efficiency and economic efficiency. Users should pay attention to relevant issues.