A high current relay is an electromechanical device used to control circuits that require high electrical current, typically above 10A, often reaching up to several hundred amperes. These relays consist of an electromagnet, a set of contacts, and a spring-loaded mechanism. When a low-current control signal is applied to the electromagnet, it activates the relay, causing the contacts to close or open, thus enabling or interrupting the flow of current in the main circuit. The ability to control such high current loads with a relatively low input is one of the defining features of high current relays.