Au TO / i S O l AT i O N T R A N S F O R M E R S
Step-Down, Step-Up and Isolation Transformers
Auto/Isolation Transformers
Isolation Transformers have two (2) separate windings with an elec-
trostatic shield between them to provide complete electrical isolation from
the source.
style A
Auto Transformers have one (1) winding that is tapped to achieve
specific output voltage. They provide no electrical isolation in a circuit.
style c
Auto Transformers are typically smaller than their Isolation equivalent.
See Accessories, pages 40-41,
for International Adapter Plugs
Designed for 50/60 Hertz
sTAnco R Rms DImens Ions -Inches
PART Voltage Input output Test case mounting Weight Agency
sec. nUmBeR Type step Voltage Voltage Amps V.A. c ap. Voltage style h W D mW mD (lbs.) certif.
A P-6287 Auto Down 230 115 0.35 40 1500 C 3.13 2.50 2.75 2.00 1.75 2.20
P-8620 Auto Down 230 115 0.43 50 1500 A 2.31 3.69 1.88 3.13 - 1.50 -
GSD-75 Auto Down 230 115 0.65 75 1500 C 3.13 2.50 2.88 2.00 1.75 3.00 -
P-8630 Auto Down 230 115 0.74 85 1500 C 3.13 2.50 2.88 2.00 1.75 2.50 -
GSD-100 Auto Down 230 115 0.87 100 1500 C 3.13 2.50 3.13 2.00 2.06 3.70 -
B P-8631 Auto Down 230 115 1.10 125 1500 C 3.13 2.50 3.00 2.00 2.06 3.00 -
GSD-150 Auto Down 230 115 1.30 150 1500 C 3.88 3.13 3.25 2.50 2.22 4.40 -
P-8632 Auto Down 230 115 1.74 200 1500 C 3.88 3.13 3.25 2.50 2.22 4.20 -
GSD-250 Auto Down 230 115 2.20 250 1500 C 3.88 3.13 3.63 2.50 2.22 5.80 -
GSD-300 Auto Down 230 115 2.60 300 1500 C 3.88 3.13 3.63 2.50 2.22 5.80 -
C GSD-350 Auto Down 230 115 3.00 350 1500 C 3.88 3.13 4.31 2.50 2.72 7.30 -
P-8634 Auto Down 230 115 3.50 400 1500 C 3.88 3.13 4.25 2.50 2.72 7.00 -
GSD-500 Auto Down 230 115 4.30 500 1500 C 4.63 3.81 4.44 3.00 3.19 10.6 -
GSD-750 Auto Down 230 115 6.50 750 1500 C 4.63 3.81 5.38 3.00 3.94 14.4 -
GSD-1000 Auto Down 230 115 8.70 1000 1500 C 4.63 3.81 6.06 3.00 4.69 17.0 -
GSD-1500 Auto Down 230 115 13.0 1500 1500 C 5.38 4.44 6.00 3.50 4.00 20.0 -
D P-8638 Auto Up 115 230 0.54 125 1500 C 3.13 2.50 3.00 2.00 2.06 3.00 -
P-8639 Auto Up 115 230 1.30 300 1500 C 3.88 3.13 3.88 2.50 2.22 5.20 -
P-8640 Auto Up 115 230 2.17 500 1500 C 4.63 3.75 4.50 3.00 3.19 10.3 -
P-8689 Auto Up 115 230 4.35 1000 1500 C 4.63 3.75 6.13 3.00 4.69 17.0 -
E P-6413 Isolation Straight 115 115 0.005 0.60 1500 A 1.25 2.13 1.25 1.75 - 0.25 -
P-6411 Isolation Straight 115 115 0.13 15 1500 A 2.00 3.25 1.88 2.81 - 1.00 -
P-6412 Isolation Straight 115 115 0.30 35 1500 A 2.31 3.75 2.00 3.13 - 1.70 -
P-6410 Isolation Straight 115 115 0.43 50 1500 C 3.50 2.81 3.50 2.25 2.00 3.70 -
F P-8622 Isolation Straight 115 s115/230 1.30 150 1500 C 3.88 3.13 4.00 2.50 2.72 6.20 -
P-6406 Isolation Straight 115/230* 115 0.43 50 1500 A 2.38 3.75 2.31 3.13 - 1.80 -
G GIS-100 Isolation Straight 115 115 0.87 100 1500 C 3.50 2.81 3.56 2.25 2.28 4.50 -
GIS-150 Isolation Straight 115 115 1.30 150 1500 C 3.88 3.13 4.19 2.50 2.72 7.00 -
GIS-250 Isolation Straight 115 115 2.17 250 1500 C 4.69 3.75 4.38 3.00 3.19 9.00 -
GIS-500 Isolation Straight 115 115 4.35 500 1500 C 4.69 3.75 6.00 3.00 4.69 16.0 -
GIS-1000 Isolation Straight 115 115 8.70 1000 1500 C 5.38 4.38 8.13 3.50 6.50 31.0 -
H GISD-100 Isolation Down 230 115 0.87 100 1500 C 3.50 2.81 3.63 2.25 2.28 4.50 -
GISD-150 Isolation Down 230 115 1.30 150 1500 C 3.88 3.13 4.19 2.50 2.72 7.00 -
GISD-250 Isolation Down 230 115 2.17 250 1500 C 4.69 3.75 4.38 3.00 3.19 9.00 -
GISD-500 Isolation Down 230 115 4.35 500 1500 C 4.69 3.75 6.00 3.00 4.69 16.0 -
GISD-1000 Isolation Down 230 115 8.70 1000 1500 C 5.38 4.38 8.13 3.50 6.50 31.0 -
Has electrostatic shield on separate leadwire (not grounded) For outline drawings refer to page 39
s Secondary is two separate 115 volt windings can be wired independently
Has lead wires
* Primary is two separate 115 volt windings
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Au TO / i S O l AT i O N T R A N S F O R M E R S
Step-Down, Step-Up and Isolation Transformers
Style C
Style A
d
G E N E R A L I N F O R M A T I O N motor which is somewhat higher than the running current. This information
is generally available from the appliance manufacturer. Information pertaining
standard length of the input and output cords:
to the AC Wattage or current required by an appliance is generally marked
1
Input Cord = 5 /2 Feet minimum
on the item by the manufacturer and should be observed. It is much better to
Output Cord = 8 Inches minimum
buy a transformer with a larger VA rating than you will actually need because
of larger motor starting currents and variations in the line voltage and/or fre-
Auto/Isolation Transformers can be used in most countries by using
quency in some locations, which could cause overheating.
an input adapter plug. See page 40 for STANCORs high quality line of
International Adapter Plugs.
Isolation Transformers
Used where a direct connection between primary and secondary circuits is
W H y & W H E R E A U T O & I S O L A T I O N
not desired and the circuits must be isolated. This results in a larger, heavier
T R A N S F O R M E R S A R E U S E D
and more costly item for a given power rating. However, in addition to the
Stancors stock Auto Transformers are connected for either step-down or
isolating advantages, an electrostatic shield is generally added to minimize
step-up applications involving line voltages of 115 or 230 Volts., 50/60 Hertz.
capacitive coupling between primary and secondary circuits. This helps to
When isolation between the primary and secondary circuits is not necessary,
minimize the transfer of unwanted power line transients and interference
and a direct connection between them is permissible, the Auto Transformer
from other sources connected to the power line by capacitive coupling to the
offers the advantages of smaller size, less weight, and lower cost.
secondary circuit. The standard insulation test voltage rating between wind-
This type of unit is generally used in applications involving American appli-
ings and between each winding and the core is 1,500 Volts R.M.S. This is
ances used abroad where our standard 115 Volt equipment must operate from
normally sufficient for 115 and 230 Volt operation.
a 230 Volt source. It is also used for foreign appliances designed for 230 Volt
The VA rating should be selected for each specific application, with allow-
operation, which are to be used on our 115 Volt circuits. Our catalog items
ance for any abnormal load or environmental conditions. All catalog items
are designed for continuous rated output on either 50 or 60 Hertz.
have an operating temperature of 105 Degrees C. (Designed for a 65 Degrees
It is important to bear in mind that the Auto/Isolation
C. maximum temperature rise above a maximum ambient temperature for 40
Transformers change only the voltage levels and do not change
Degrees C., with unrestricted free air ventilation.) V-A/Amps output ratings are
the frequency from 50 to 60 h ertz or vice versa. In appliances
for continuous operation from the specified input voltage and frequency.
using synchronous motors, such as clocks or phonograph record
General Information
changers and players, the speed will be different when using them
All of these items have Class A insulation and are rated to have a maximum
on a frequency which differs from the frequency they were origi-
operating temperature of 105 Degrees C. These units may be used with
nally designed. In these cases the manufacturer of the appliance
rectifiers but the form factor as explained elsewhere in this catalog should
should be consulted to obtain the proper motor.
be observed for various combinations of rectifier circuits and types of load
The VA rating is equivalent to a Wattage rating where a resistive load and/
following the rectifier.
or unity power factor exists. When inductive loads such as motors are used
These items are made with our standard N.E.M.A. plugs and receptacles,
(as in a motor driven appliance) the power factor is not unity and to be accu-
primarily for use in this country. However, if used overseas where different
rate the output is expressed in VA, which is the product of the output voltage
types of plugs are necessary, an adapter plug should be used or our plug
and the output current (Amps).
removed and a foreign plug attached to the end of the line cord.
When selecting one of these items for use with an appliance which
includes a motor, allowance should be made for the starting current of the
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