Relay is a kind of commonly used control device, it can use a small current to control large current;
With low voltage to control the high voltage, with direct current (dc) to control the alternating current (ac), etc. , and realizes the control circuit and be completely isolated between the control circuit, in automatic control, remote control, widely used in the protection circuit, etc.
Relay on the excavator is commonly used to protect the circuit!
When excavator one current is too large, the inside of the relay fuse received large flow of current fuse themselves, have played an important role in protecting circuit already so, also can prevent important electrical components will be burned! ! !
Important is can prevent short circuit circuit directly cause sparks, prevent excavator for electrical system go wrong, and cause fire.