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Switch device for street lighting with an all-night circuit has safety fuses and a three-way switch relay to ensure power supply always connects to the same contact during alternate operation
Switch device for street lighting with an all-night circuit has safety fuses and a three-way switch relay to ensure power supply always connects to the same contact during alternate operation
Four safety fuses and a three-way switch relay (K1) are connected in a switch circuit so that power supply always connects to the same contact during alternate operation of first (L1) and second (L2) terminals. A switch device is incorporated in lamps and lampposts so as to operate a single-flame lamp on a two-phase network.
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