This listing is for Mercedes Benz MULTI FUNCTION relay To Suit W124 (LATE-300E) 260E 300TE W126 300SE 300SEL W201 190E 2.6

A relay in a car is an electrical component that acts as a switch. It is typically used to control high-current circuits or circuits connected to different voltage levels.

The relay works by using a low-current signal to activate an electromagnet that, in turn, closes or opens the contacts of the relay. This enables the relay to control power flow to various components in the car.