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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One Comment

  1. […] curves.They therefore can be viewed in simple terms as an analogue electronic replacement for electromechanical relays, with some additional flexibility in settings and some saving in space requirements. In some cases, […]

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