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15.12.2015

Product Portrait

Relays for trucks, trailers and buses

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Guaranteed quality has made the brand
DT® Spare Parts the leading brand in the international Independent Aftermarket for commercial vehicles. The complete range includes all required spare parts for trucks, trailers and buses, including all standard relays.

The DT® brand products, made of high quality materials, meet your highest quality requirements and guarantee a long period of use.

Relays are used to separate electrical circuits and to switch electrical consumers up to a current of 70 amperes. The advantages of relays are the compact design and the possibility of switching large electrical consumers with low currents. Furthermore, relays provide the possibility of switching higher voltages with low control voltages.

DT-Technic Info

In a robust plastic housing, is an electric solenoid coil, which is supplied with electricity via a standard flat plug when switched on. When electricity flows, the coil produces a magnetic field in the core of the coil which, via an armature, opens or closes one or more contacts, depending on the design.

To obtain a low tendency to “sweating” and low contact resistance, the plug contacts are made of brass with a nickel-plated surface and the switching contacts are coated with resistant silver-tin oxide.

To prevent the occurrence of contact-braking sparking, relays with double contacts are available, depending on the application.

 Construction of relays

  1. Base plate
  2. Connector no 87
  3. Connector no 86
  4. Connector no 30
  5. Connector no 85
  6. Coil connection bracket
  7. Return spring
  8. Armature
  9. Copper wire/strand
  10. Copper coil
  11. Pre contact
  12. Main contact
  13. Ferrite rod/ coil core


Relays of the brand DT® Spare Parts often already contain electrical components in the housing to restrict the counter-induction voltage of the coil. This prevents the circuits from interacting with each other, which can lead to unwanted relay switching.

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