I know the switch is called "master electrical"
What is the kind of relay and contactor? "Switching element"?
Said the contactor is low voltage electrical appliances are also inappropriate, because there are high voltage contactors.
Relays, contactors are control electronics, part of the signal relay, low-power relays, PCB relays and other electronic devices.
Buttons, knobs, universal switch, combination switch, inverted switch, etc. is the main electrical appliances;
Circuit breakers, disconnectors, load switches, dual power switch, etc. are not the main electrical appliances.
The contactor is the contactor class;
The relay is the relay class.
Above the friend said I agree with the relay relay in the supplement, also known as low-voltage electrical appliances
