Manufacturers available:  Carlo Gavazzi, Continental Industries, Omron, and others.
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Electromechanical relays are electrically operated switches used to isolate circuits or batteries, detect faults on transmission and distribution lines, and control a high powered circuit using a low power signal. Simple relays consist of a magnetic core wrapped in a wire coil, a movable armature attached to an iron yoke, and one or more set of contacts. When an electric current passes through the coil it generates a magnetic field that activates the armature, therefore moving the contacts to make or break a connection