| 摘要 |
A power control relay with a solid state switching device being arranged to control the current to the coil of the relay in a series circuit therewith can be operated safely and reliably in manufacturing environments by control thereof with a floating voltage developed by the secondary of a low voltage transformer with one side of the secondary connected to the gate of the solid state switching device through a diode and the opposite side of the secondary being controlled by a resistive probe circuit, which when grounded, will cause a voltage to be impressed on the gate that will cause the switching device to trigger thereby operating the relay due to the differential impedance developed in the floating voltage circuit arrangement.
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