Precise power management is non-negotiable for everything from the most basic automation systems to complex transportation networks. Of the options available to fit standard safety requirements,
electromagnetic relays are valued for their ability to manage significant electrical loads using low-power control signals. These devices mechanically open or close conductive contacts in response to a control signal, helping to create complete electrical separation between control and load circuits. With this in mind, this blog will take you through every step of how electromagnetic relays function, as well as cover some differences that can manifest between types to help you make more informed decisions when sourcing such items for your own systems.
Electromagnetic Relays in Action
Step 1: Coil Energization
The operating sequence begins when a control voltage is applied to the relay’s coil assembly, prompting it to generate a magnetic field. This assembly is constructed from insulated conductive wire wound around a non-conductive bobbin, the strength of its output being influenced by the electrical resistance of the wire, its gauge, and the number of turns it has. Because the coil is electrically isolated from the load circuit, it is also able to operate on a relatively low amount of power.