Category
page 1Relays

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

contactor
thumb|Tesys D Schneider Electric Contactor
A contactor is a type of relay (electrically operated switch) with high power rating (current rating and voltage rating). Contactors usually refer to devices switching more than 15 amperes or in circuits rated more than a few kilowatts. Contactors are typically used to control electric motors (combination motor starters), lighting, heating, capacitor banks, thermal evaporators, and other electrical loads. The physical size of contactors ranges from a device small enough to pick up with one hand, to large devices approximately a meter on a side.
Buchholz relay
safety device for oil-filled electrical transformers
solid-state relay
electronic switching device in which a small control signal controls a larger load current or voltage
safety relay
devices that generally implement safety functions
protective relay
relay device designed to trip a circuit breaker when a fault is detected
Reed relay
electromagnetic relay employing a reed switch
digital protective relay
computer-based system with software-based protection algorithms for the detection of electrical faults
mercury relay
relay using mercury metal