The difference between relays and contactors

Update:23-03-2019
Summary:

The essential difference between the relay and the cont […]

The essential difference between the relay and the contactor is that the load is different. The current capacity is large for the contactor, the small is the relay, and the contactor for the main circuit and the relay for the control circuit are used.
The function of the contactor is to switch on and off a large current signal, drive the power equipment such as a motor; the role of the relay is to convert the signal, the interface of the control signal between the devices of different voltage levels, and the contact bearing The ability is generally small, used to drive electrical components such as contactors.
The relay belongs to the secondary equipment. It has intermediate relays, voltage relays, current relays, time relays, etc. It is used for signal sampling, switching, control, protection, etc. It belongs to low-voltage equipment, and the contact capacity is small, generally 5A.
The difference between relays and contactors is here. The focus has been on relays. Today, relays and contactors are introduced. What we need to pay attention to is that the function of the contactor is to control the large current load with a small current. Control, at the same time can be self-locking interlock to prevent accidents caused by malfunction, because of the small current control, making the protection circuit simple and reliable.

More: single-phase relay