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  2. Trailer connectors in North America - Wikipedia

    en.wikipedia.org/wiki/Trailer_connectors_in...

    Flat 5-pin connector (Towing vehicle side) This contact is not as common, but is compatible with the 4-pin connector in the way that a towing vehicle with this connector can be connected to a trailer with the 4-pin flat plug. The extra connection is often used to block the surge brakes when reversing with the trailer. #

  3. DIN 72552 - Wikipedia

    en.wikipedia.org/wiki/DIN_72552

    2 out 82 lock in 82a 1st out 82b 2nd out 82z 1st in 82y 2nd in 83 multi position switch, in 83a out position 1 83b out position 2 Relay; 85 relay coil - Important if relay coil has flyback diode in parallel 86 relay coil + Important if relay coil has diode in parallel Relay contacts 87 common contact 30/51 87a normally closed contact 87b

  4. Relay - Wikipedia

    en.wikipedia.org/wiki/Relay

    Time-delay relay contacts must be specified not only as either normally open or normally closed, but whether the delay operates in the direction of closing or in the direction of opening. The following is a description of the four basic types of time-delay relay contacts. First, we have the normally open, timed-closed (NOTC) contact.

  5. ISO standards for trailer connectors - Wikipedia

    en.wikipedia.org/wiki/ISO_standards_for_trailer...

    The 5-pin has a design and pin layout that is identical to the 7-pin ISO 1724 connector with the exception for the lack of pin 1 (L) and pin 4 (R). This connector is sometimes present on vintage vehicles and the actual wiring may be completely different from what the standard states which means that measuring before connecting is a good idea.

  6. Dry contact - Wikipedia

    en.wikipedia.org/wiki/Dry_contact

    Dry contacts are primarily employed in extra-low voltage (less than 50 V AC) distribution circuits. No mercury: The wet contact of a mercury-wetted relay gives certain operational advantages. Dry contacts means a relay that does not use mercury-wetted contacts. Dry joint: A dry contact can be confused with a dry joint, which is a type of poorly ...

  7. Wiring diagram - Wikipedia

    en.wikipedia.org/wiki/Wiring_diagram

    An automotive wiring diagram, showing useful information such as crimp connection locations and wire colors. These details may not be so easily found on a more schematic drawing. A wiring diagram is a simplified conventional pictorial representation of an electrical circuit. It shows the components of the circuit as simplified shapes, and the ...

  8. Contact resistance - Wikipedia

    en.wikipedia.org/wiki/Contact_resistance

    The units of specific contact resistivity are typically therefore in ohm-square metre, or Ω⋅m 2. When the current is a linear function of the voltage, the device is said to have ohmic contacts . Inductive and capacitive methods could be used in principle to measure an intrinsic impedance without the complication of contact resistance.

  9. Mercury relay - Wikipedia

    en.wikipedia.org/wiki/Mercury_relay

    Normally closed mercury relay, with coil around top of tube and adjustable angle. 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.

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