In this blog, we will take you through how to use a 24-volt relay on a 12-volt system, and provide reference on how to use relays to allow a pre-existing 24 VDC control system to control 12 VDC actuators. Relays make use of an electromagnet that when energized would mechanically pull a switch to change contact points. A low current signal at 24 VDC can run through the coil inside the 24 VDC relay to switch between the normally open node (NO) and the normally closed node (NC), in which each node can be connected to a 12 VDC source to power a 12 VDC device or actuator.

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