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  2. Relay - Wikipedia

    en.wikipedia.org/wiki/Relay

    Coil voltage — machine-tool relays usually 24 VDC, 120 or 250 VAC, relays for switchgear may have 125 V or 250 VDC coils, Coil current — Minimum current required for reliable operation and minimum holding current, as well as effects of power dissipation on coil temperature at various duty cycles. "Sensitive" relays operate on a few ...

  3. Flyback diode - Wikipedia

    en.wikipedia.org/wiki/Flyback_diode

    When used with a DC coil relay, a flyback diode can cause delayed drop-out of the contacts when power is removed, due to the continued circulation of current in the relay coil and diode. When rapid opening of the contacts is important, a resistor or reverse-biased Zener diode can be placed in series with the diode to help dissipate the coil ...

  4. DIN 72552 - Wikipedia

    en.wikipedia.org/wiki/DIN_72552

    from 2nd battery and 12/24 V relay: 31 return to battery- or direct to ground 31a return to battery- 12/24 V relay 31b return to battery- or ground through switch 85d 31c return to battery- 12/24 V relay 31, 31a Electric motors; 32 return 31 33 main terminal (swap of 32 and 33 is possible) 30 33a limit 33b field 54e 33f 2. slow rpm: 33g 3. slow ...

  5. NEMA contact ratings - Wikipedia

    en.wikipedia.org/wiki/NEMA_contact_ratings

    NEMA contact ratings are how much current at a rated voltage a relay or other pilot device can switch. The current rating of smaller NEMA contactors or their auxiliaries are defined by NEMA ICS 5: Industrial Control and Systems, Control Circuit and Pilot Devices [1] standard. The nomenclature is a letter followed by a three-digit number, the ...

  6. Contactor - Wikipedia

    en.wikipedia.org/wiki/Contactor

    When current passes through the electromagnet, a magnetic field is produced, which attracts the moving core of the contactor. The electromagnet coil draws more current initially, until its inductance increases when the metal core enters the coil. The moving contact is propelled by the moving core; the force developed by the electromagnet holds ...

  7. Reed relay - Wikipedia

    en.wikipedia.org/wiki/Reed_relay

    (from top) Single-pole reed switch, four-pole reed switch and single-pole reed relay. Scale in centimeters. A reed relay [i] is a type of relay that uses an electromagnet to control one or more reed switches. The contacts are of magnetic material and the electromagnet acts directly on them without requiring an armature to move them.

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