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  2. Relay - Wikipedia

    en.wikipedia.org/wiki/Relay

    Relay. A relay is an electrically operated switch. It consists of a set of input terminals for a single or multiple 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.

  3. Relay logic - Wikipedia

    en.wikipedia.org/wiki/Relay_logic

    A relay logic circuit is an electrical network consisting of lines, or rungs, in which each line or rung must have continuity to enable the output device. A typical circuit consists of a number of rungs, with each rung controlling an output. This output is controlled by a combination of input or output conditions, such as input switches and ...

  4. Solid-state relay - Wikipedia

    en.wikipedia.org/wiki/Solid-state_relay

    Solid-state relay. A solid state relay (SSR) is an electronic switching device that switches on or off when an external voltage (AC or DC) is applied across its control terminals. They serve the same function as an electromechanical relay, but solid-state electronics contain no moving parts and have a longer operational lifetime.

  5. Time switch - Wikipedia

    en.wikipedia.org/wiki/Time_switch

    A simple 24-hour cyclical electromechanical time switch with a French CEE 7/5 socket. A time switch (also called a timer switch, or simply timer) is a device that operates an electric switch controlled by a timer. Intermatic introduced its first time switch in 1945, which was used for "electric signs, store window lighting, apartment hall ...

  6. Flip-flop (electronics) - Wikipedia

    en.wikipedia.org/wiki/Flip-flop_(electronics)

    A SR latch (R1, R2 = 1 kΩ; R3, R4 = 10 kΩ) In electronics, flip-flops and latches are circuits that have two stable states that can store state information – a bistable multivibrator. The circuit can be made to change state by signals applied to one or more control inputs and will output its state (often along with its logical complement too).

  7. Mercury relay - Wikipedia

    en.wikipedia.org/wiki/Mercury_relay

    A mercury relay (mercury displacement relay, mercury contactor) is a relay that uses mercury as the switching element. They are used as high-current switches or contactors, where contact erosion from constant cycling would be a problem for conventional relay contacts. Owing to environmental considerations about the toxicity of mercury, mercury ...