1. The effect is not the same:
The primary effect of the relay is: signal detection, transmission, conversion or disposal, the circuit current it is on and off is generally small, and it is generally used in the control circuit to control weak signals.
The primary effect of the contactor is to turn on or off the main circuit. The main circuit refers to whether a circuit is operated or not is marked by whether the circuit is turned on or not. The main circuit concept corresponds to the control circuit. Generally, the current passed through the main circuit is larger than that of the control circuit.
Contactors with large capacities are generally equipped with an arc extinguishing hood. The contact capacity of the relay generally does not cross 5A, the contact capacity of the small relay is generally only 1A or 2A, and the contact capacity of the contactor is the smallest 9A; The contactor contacts generally have three pairs of main contacts (the main contacts are normally open contacts), and there are several pairs of auxiliary contacts.
The contacts of the relay are generally not divided into main and auxiliary; The contacts of the relay are sometimes set in pairs, that is, the normally open and normally closed contacts are combined, while the contactors are not set in pairs; Relays are planned to be combined with other equipment for specific needs, such as time relays, counters, pressure relays, etc., which have additional functions, while contactors generally do not.
2. The opening and closing of the contacts are different:
Other contactors are used to turn on or off loads with high power, and are used in (power) main circuits, where the main contacts can have interlocking contacts to indicate the opening and closing of the main contacts.
Relays are generally used in electrical control circuits to extend the contact capacity of miniature or small relays to drive larger loads. For example, the contact of the relay can be used to turn on or off the coil of the contactor. Generally, relays have more opening and closing contacts, of course, relays can also end some special functions after proper connection, such as logical operations.
3. There is no arc extinguishing device:
In fact, looking at contactors and relays, one of the most important differences is that the contactors have arc extinguishing devices, while relays do not.
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