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Phase rotation meter. Phase Sequence meter.

50109-D-01 Phase Rotation Meter - Sequence Indicator
The Model 50109-D-01 Phase Rotation Sequence Indicator is a compact, lightweight instrument
designed to save time and energy and eliminate mistakes when connecting loads to polyphase circuits.
Simplicity, ease of operation and ruggedness are the outstanding features of this indicator.
The instrument may be suspended by its numbered test clips and the correct phase sequence of the supply
determined by pressing the switch on the side of the case.

Phase Rotation Sequence Indicator

Model  Description 
50109-G-01  Phase Rotation Meter 110/220/440/550V

Meets specifications of Spec. MIL-1-16103
Weight: 1 1/4 pounds
Size: 1 1/2" thick x 3 1/2" diameter
Case: Molded bakelite with unbreakable crystal
Voltage: 3 Phase, 110/220/440/550 volts, 25/60 cycles.
Specials: 400 or 1,000 cycle and switchboard mounting units are available.

Information as to the rotation or sequence of the different phases must be known when paralleling
generators, connecting induction motors, replacing transformers, changing lines and services
supplying any polyphase load.
This instrument may be used interchangeably on 110, 220, 440, 550 volt circuits of either 25 or 60 cycles.