AR-PRO – AC LINE VOLTAGE REGULATOR
INPUT VOLTMETER: Measures input voltage in ei-
ther of two ranges. The appropriate range is selected
automatically and is indicated by an LED at the end
of the scale. All LEDs are green except those at the
extreme high and low ends, which are yellow. (Model
AR-PRO-J has a 120V/100V switch on the rear pan-
el. When it is set to 100V, use the blue scale for the
OUTPUT AMMETER: Measures output current when
it is between 5 and 30 amps. An additional “Overload”
LED indicates current of 30A or more (if an overload
continues for more than a few seconds, the circuit
breaker will trip). The grey bar indicates a recommended
operating range. The LEDs are green within this range, and
become fi rst yellow and then red when it is exceeded.
OUTPUT VOLTAGE INDICATORS: This display in-
dicates whether the output voltage is within 5% of
nominal 120V (or for model AR-PRO-J, either 120V or
100V depending on the rear panel switch setting). It
will light green when IN REGULATION, & yellow if 5%
The yellow lights come on only when the input voltage
is extremely far from normal. However, that doesn’t
necessarily mean your equipment won’t work (even
10% below 120V is 108V, which is still adequate for
INPUT SELECT: The Input Select Switch is the only
front panel control. Its function is to select the correct
hot and neutral wires in the supply cable, consistent
with cable wiring in conformance with USA electrical
codes. This switch is necessary because the United
States (and other North American countries) use a dif-
The upper position is for any
situation in which the AR-PRO is
fed either 120V or 100V, or 220V
to 240V in a non-North American
country. This corresponds to a
two-wire scheme (hot-neutral).
The lower position should be
selected only when running the
the USA (or North America)
This corresponds to a three-wire
scheme (hot-neutral-hot), even
if the neutral wire is omitted from
Note that this switch only selects the active pins on the
four-pin twist-lock supply connector. It does not select
the voltage range (that is done automatically). Therefore,
if the switch is inadvertently set to the wrong position,
the AR-PRO will simply not receive power and will not
operate. No damage will be done.
restored when the switch is reset correctly.)
INPUT SELECT
100/200
OR NON-USA
220/240 VAC
USA 220/240 VAC
Current Breaker for off-shore
Front Panel Regulated Outlets
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