Relay & Switches

Relay

Earlier relays were used as amplifiers in the long-distance telegraph circuits. Relay evolved to solve more purposes in the technology sector and telephone exchange. They are electromechanical switches that use low-power signals to control the circuit.

Its essential components are an armature, a spring, an electromagnet, and a series of electrical contacts. The circuits inside a relay use magnetic connections instead of electric ones.

Switch

Yes! We all know what a switch is! Let’s get to its technical definition. The primary purposes of a switch as a device are to break the current, interrupt the current, and supply current from one conductor to another. The “On and off” mechanism is used to perform this task. There are 4 main classifications of a switch:-

  • Single Pole Single Throw (SPST)
  • Single Pole Double Throw (SPDT)
  • Double Pole Single Throw (DPST)
  • Double Pole Double Throw (DPDT)

Various operative technologies are used in a switch, such as:-

  • Rocker switches
  • Slide switches
  • Pushbutton switches
  • Rotary switches
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