A relay is an electromechanical component or an electrical switch designed to control electrical circuits, in particular switching on and off according to set conditions related to the change in input current. Extremely suitable in automatic program processes for controlling automatic machines and devices in a production or support process in various industries. Electromagnetic relays are an electric wire wound on a coil as well as a metal plate - an armature. It consists of a movable armature, one or more sets of contacts, and a spring that holds the armature in one position. When an electric current flows through the coil, an electromagnetic field is created, which moves the armature and causes it to turn on, off or switch the contacts, that is, to change the position of the contacts.
Electromagnetic relays are a good alternative to electrical switches for controlling electrical appliances and various electrical AC or DC loads. They give multiple possibilities to control, turn on, turn off electric circuits, as well as create automations. Electromagnetic relays can be built into various electrical devices, as well as on a DIN rail in electrical panels.