Reducing Operating Power of Relays

Engineer fixing a light bulbEven with the invention of new technologies, the wrong choice to use in your systems can cause energy losses that could end up costing you money. As a result, manufacturers are looking to add features to components and devices with an aim to minimize energy loss and maximize device efficiency.

For example, as Gordo Sales, Inc. explains, mercury relays offer massive energy savings when incorporated into systems and applications. You can reduce the holding voltage in relays after you close the contacts. The relays can lower the effect of power consumption in a system through the process of reducing coil voltage. The common methods of reducing the holding voltages include:


Modulating the pulse width will guarantee a lower voltage. First, switch on the MOSFET to supply sufficient voltage to your coil to ensure that duty ratio gets to 100%. After you close the contacts, start the modulation process when the duty ratio is halfway and while controlling the power. The recommended control frequency lies between 20 kHz and 100 kHz.

CR Circuit

You will need to apply a higher voltage than the coil voltage. Once the relay switches on, you can control the power that the relay takes by varying the resistor, capacitor, and resistance of the coil.

Switching Method

A relay has two switches, and you can manipulate them to achieve your desired voltage. Turn on the first switch around the operating voltage. Once you close the relay, release the switch and turn on the other switch. Use the resistance to set the holding voltage and regulate the coil resistance to get the desired voltage.

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If you want to lower the holding voltage of a coil using any of the different techniques, it’s essential that you obtain the right relay. Mercury relays are not only efficient in operation, but will also help you achieve a low holding voltage for your coils.