Question

What is the function of each of the two low-voltage coils in the relay? __________

   What is the function of each of the two low-voltage coils in the relay?
  __________

Electricity 1: Devices, Circuits and Materials

Electricity 1: Devices, Circuits and Materials

Thomas Kubala 9th Edition

Chapter 19, Problem 2

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These are typically referred to as the "energizing coil" and the "holding coil." Show more…

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What is the function of each of the two low-voltage coils in the relay? __________

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Key Concepts

Relay

A relay is an electromechanical switch that uses low-power electrical signals to control a high-power circuit. Its main function is to allow a small controlling voltage or current to switch a much larger voltage or current by using mechanical movement activated by an electromagnetic field.

Electromagnetic Coil

Electromagnetic coils are windings of wire that, when energised by an electric current, create a magnetic field. In relays, these coils are essential because the generated magnetic field is what drives the mechanical movement of contacts, enabling or disabling the circuit.

Dual-Coil Operation

In some relay designs, particularly latching or bistable relays, two separate low-voltage coils are used to control the switching mechanism. One coil is used to 'set' the relay by moving its contacts into a closed or engaged position, while the other coil 'resets' the relay to return the contacts to their default state. This dual-coil setup allows for precise control over the relay's switching functions using low-power signals.

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