FIELD: electricity.
SUBSTANCE: device contains two electric branches, some ends of which are connected between each other, and the others - to corresponding contacts of plug. Every branch includes indicator element, which is serially connected to limiting resistor. Indicator elements are arranged in the form of light diodes that are connected back-to-back. Earthing contact is taken out from the middle point of electric circuit that connects both branches.
EFFECT: simplification of device; higher reliability.
4 dwg
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