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Design

The basic design of electromechanical power relays is the same regardless of whether it is a miniature PCB relay or an industrial power relay.

The most important components are:

Contact system or secondary side

  • fixed contacts
  • moving contacts (contacts being moved by the magnetic system (motor) to switch the load circuit)
  • contact springs (holding the contacts, but sufficently flexible to allow the contacts to move)

Magnetic system

  • coil (to generate necessary magnetic field to actuate the armature and the contacts)
  • core
  • joke (to establish the magnetic circuit)
  • armature (the moving part of the magnetic system which closes and opens the magnetic circuit and acts via comb or acturator on the moving relay contacts)
  • return spring (to establish a defined position of the magnetic and contact system in case the coil is not energized)
Title:Electromechanical Relays
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