Relays Kablomer > OUR PRODUCTS > Relays A relay is an electromagnetic circuit component that runs as the current passes through it. Relays are used to switch a high-power receiver with a small rate of current. Relays may have multiple switch contacts in a single component and thus can open and close multiple loads simultaneously. RELAY PRODUCTS ABB MV and HV Protection Relays Manufactured by ABB as the leader in technology, ABB medium-voltage and high-voltage relays are products with advanced features, which are proven for high quality and reliability. ABB Combiflex ABB Combiflex series auxiliary relays and test equipment add unique convenience and benefits to your projects.