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  2. Reed switch - Wikipedia

    en.wikipedia.org/wiki/Reed_switch

    The reed switch [i] is an electromechanical switch operated by an applied magnetic field. It was invented in 1922 by professor Valentin Kovalenkov at the Petrograd Electrotechnical University , [ 1 ] and later evolved at Bell Telephone Laboratories in 1936 by Walter B. Ellwood into the reed relay.

  3. Magnetic switch - Wikipedia

    en.wikipedia.org/wiki/Magnetic_switch

    Magnetic switch. Magnetic switch is an electrical switch that makes or breaks contact in the presence of a magnetic field.Applications include situations where it is not desirable or possible for moving elements to make direct contact with the switch, such as in explosive environments, submerged in liquids, and where repetitive contact with a mechanical switch would result in undesired wear.

  4. Magnetic switchable device - Wikipedia

    en.wikipedia.org/wiki/Magnetic_switchable_device

    A magnetic switchable device (often called a magnetic base) is a magnetic fixture that uses one or more permanent magnets in a configuration that allows the external field to be turned on or off. They are used in many applications including optics , metalworking , lifting , and robotics, to attach items to metal surfaces in a secure but ...

  5. Balun - Wikipedia

    en.wikipedia.org/wiki/Balun

    A balun / ˈ b æ l ʌ n / (from "balanced to unbalanced", originally, but now derived from "balancing unit") [1] is an electrical device that allows balanced and unbalanced lines to be interfaced without disturbing the impedance arrangement of either line. [2] A balun can take many forms and may include devices that also transform impedances ...

  6. Residual-current device - Wikipedia

    en.wikipedia.org/wiki/Residual-current_device

    A residual-current device (RCD), residual-current circuit breaker (RCCB) or ground fault circuit interrupter (GFCI) [a] is an electrical safety device, more specifically a form of Earth-leakage circuit breaker, that interrupts an electrical circuit when the current passing through line and neutral conductors of a circuit is not equal (the term residual relating to the imbalance), therefore ...

  7. Phantom circuit - Wikipedia

    en.wikipedia.org/wiki/Phantom_circuit

    Unloaded phantom configuration. The windings of the loading coil are wound such that the magnetic flux induced in the core is normally in the same direction for both windings. However, in the phantom configuration the flux cancels. Unloaded phantom is a phantom configuration of loaded lines (a circuit fitted with loading coils). The idea here ...

  8. Magnetic starter - Wikipedia

    en.wikipedia.org/wiki/Magnetic_starter

    A magnetic starter is an electromagnetically operated switch which provides a safe method for starting an electric motor with a large load. Magnetic starters also provide under-voltage and overload protection and an automatic cutoff in the event of a power failure.

  9. Cryotron - Wikipedia

    en.wikipedia.org/wiki/Cryotron

    The cryotron is a switch that operates using superconductivity. [1] The cryotron works on the principle that magnetic fields destroy superconductivity. This simple device consists of two superconducting wires (e.g. tantalum and niobium) with different critical temperature (Tc).

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