What is the difference between a relay and a contactor?

1 Answers
LukasDella
07/29/25 3:42pm
The essential difference between a relay and a contactor lies in the load they can handle. A contactor is designed for larger current capacities, while a relay is for smaller ones. Additionally, contactors are used in main circuits, whereas relays are employed in control circuits. Below is an introduction to the functions of relays and contactors: Functions of a contactor: Used to connect and disconnect larger current signals, driving power equipment such as motors. Functions of a relay: Used for signal conversion, serving as an interface for control signals between devices of different voltage levels. Its contacts generally have a smaller load capacity and are used to drive electrical components like contactors.
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