The circuit was a bewildering array of magnetic relays, wires, nuts and bolts. This was on a transmitter plant with several high-power, short- and medium-wave transmitters. The plant had a 1980s ...

These type of relays are made of a coil that induces a magnetic field when it get energized and moves the armature, which closes of opens the contacts. normal closed (NC) electromechanical relay ...