how does a 4 pin relay work

A 4 pin relay is an electromechanical switch that uses a small electrical current to control a larger electrical load. It consists of a coil, a common terminal, a normally open terminal, and a normally closed terminal which allows it to perform various switching functions. The relay works by applying a small electrical current to the coil, which generates a magnetic field and causes the switch inside the relay to open or close the circuit between the common terminal and either the normally open or normally closed terminal. This allows the relay to control the flow of electricity to a larger load, such as a motor, lights, or other electrical devices. 4 pin relays are commonly used in automotive, industrial, and home automation applications to control electrical systems, automate processes, and provide protection against overloads. They are versatile, reliable, and easy to install, making them a popular choice for a wide range of electrical control and switching applications.