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Ground Fault Circuit Interrupters (GFCIs) for AC & DC …
www.westernautomation.comAC or DC Sensing GFCIs may also be categorised based on the type of ground fault current they can detect, e.g. detecting AC only, or detecting AC & DC fault currents. Trip Levels & Trip Times GFCIs covered by UL943 are known as Class A devices because their specifi ed trip level (I n) is in the range 4 – 6mA.