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relay

Also known as electric relay, electrical relay, electromechanical relay

thumb|A relay thumb|Electromechanical relay principle thumb|Electromechanical relay schematic showing a control coil, four pairs of normally open and one pair of normally closed contacts thumb|An automotive-style miniature relay with the dust cover taken off

AI overview

A relay is an electrical switch that uses a small electric current to control a much larger electric current, allowing a low-power signal to turn high-power devices on or off. Relays are important because they enable safe and efficient control of powerful equipment from a distance, and they're used in everything from cars to industrial machinery.

AI-generated from the Wikipedia summary — may contain errors.

Wikidata facts

Image: Relay Scheme.png

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Commons category: Relays
Commons gallery: Relay
time of discovery or invention: 1835-00-00

Sources (6)

via Wikidata · CC0

~39 min read

Article

29 sections

Contents

History
Basic design and operation
Terminology
Types
Coaxial relay
Contactor
Force-guided contacts relay
Latching relay
Machine tool relay
Mercury relay
Mercury-wetted relay
Multi-voltage relays
Overload protection relay
Polarized relay
Reed relay
Safety relays
Solid-state contactor
Solid-state relay
Static relay
Time-delay relay
Vacuum relays
Applications
Protective relays
Railway signaling
Selection considerations
Safety and reliability
See also
References
External links

A relay is an electrically operated switch. It has a set of input terminals for one or more control signals, and a set of operating contact terminals. The switch may have any number of contacts in multiple contact forms, such as make contacts, break contacts, or combinations thereof.