In the world of electrical engineering, relays are used to control the flow of electricity, ensuring that circuits are protected from overcurrent, short circuits, and other potential electrical faults. However, HVDC systems present unique challenges due to their ability to transmit large amounts of power over long distances. Unlike alternating current (AC) systems, which naturally pass through zero voltage, DC systems do not have zero-crossings, making it more difficult to interrupt the flow of current safely. This is where HVDC main relays come into play.