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K-3 Phase Sequence Indicator (U-1) The Knopp rotation meter indicates phase sequence from 60-600VAC, 25-60 Hertz. Insulated spring clamps.The Knopp Phase Sequence Indicator is of t he rotating-disc type. The K3 model can be used on three-phase, three-wire, 60-600 volt circuits, and on 25-60 cycle current. In addition, it is suitable for use on frequencies above 60 cycles provided the circuit voltages, are equal to or exceed the following: 150V for 133 cycles, 200V for 180 cycles, 250V for 360 cycles, and 300V for 400 cycles. Show more