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490A-4 Dwyer Instruments

  • More about 490A-4 Dwyer Instruments

    490A-4 Dwyer Instruments

    490A-4 is manufactured by Dwyer Instruments and is categorized in the General Purpose Relays category. Perfect Parts is a supplier of Relays and other Electromechanicals.

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  • More About  General Purpose Relays

    General Purpose Relays

    Relays are electromechanical devices. Power/Signal Relays, Reed Relays, RF Relays, Special Relays, and Time Delay Relays, are relays. A relay is an electrically controlled switch which uses current to create a magnetic field to attract an armature which is used to mechanically operate a switch. Solid state relays are relays which control power circuits without using any moving parts.
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