KEM-1 A, Closing reed switch 2A / 300V 50 ... 120 A

A magnetically controlled contact (reed switch) is an electrical apparatus that changes the state of an electrical circuit by mechanically opening or closing it when a control magnetic field is applied to its elements that combine the functions of contacts, springs, and sections of electrical and magnetic circuits.
The principle of operation of reed switches is based on the use of interaction forces arising in a magnetic field between ferromagnetic bodies. In this case, the forces cause deformation and displacement of the ferromagnetic conductors of electrons.