Description: Relays are widely used in electricity production control system, its role is to make use of its normally closed and normally open contacts for circuit switching. Relay is to use change as a result of metal contact, and make the moving contact and fixed contact closure or separate, so with a small contact resistance, current flow and the pressure high, especially for high-voltage high-current use of occasions. Small relays are used in precision measurement of the change-over switch circuit.
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