#electrical_relay__relay  electrical device such that current flowing through it in one circuit can switch on and off a current in a second circuit
  supertype:  electrical_device  a device that produces or is powered by electricity
  subtype:  frame_relay (comms)
  part of:  electrical_circuit
  part:  electromagnet  a temporary magnet made by coiling wire around an iron core; when current flows in the coil the iron becomes a magnet
     part:  armature  coil in which voltage is induced by motion through a magnetic field

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