Staco Energy Products Co. has been a leading manufacturer of variable
transformers for over 65 years, building standard and custom-
designed products for industrial, commercial and military applications.
Variable transformers have many industrial and laboratory applications
as basic components to control voltage, current, power, heat, speed,
light and electromechanical force.
A basic Staco variable transformer consists of a single layer magnet
wire winding on a toroidal core of laminated silicon steel. A carbon
brush, connected to an output lead, is rotated over a precision
ground, plated commutator track to tap off voltage at any turn from
zero to the maximum output voltage of the winding.
Staco research has developed design features and proprietary pro-
cesses to provide longer lasting, more reliable products. Particularly
important is the high-temperature foundation material bonding the
coil securely to the core assembly. This material has a high thermal
transfer characteristic so that it dissipates heat from the brush contact
area, increases the heat distribution of the core itself, and provides
the transformer with greater tolerance to transients and short-term
overloads.
Some Models Are
Listed by the Canadian Standards Association
File No. LR18948
In addition to the basic styles illustrated, Staco Energy can meet your
specific requirements with hundreds of additional standard model
variations and configurations from 0.8 to 450 amps, 120 to 575 volts,
50 Hz and up. 480 volt units are shown on page 8 and in our Variable
Transformer Voltage Control Catalog (VT-5). These models include
cased and uncased, single and three phase manual and motor driven
models, and complete voltage control systems. Complete information
is contained in our Variable Transformer Voltage Control Catalog.
To serve your needs promptly, Staco Energy has a national network of
stocking distributors to assure immediate off-the-shelf delivery. Your
local Staco distributors and representatives are factory trained, and
capable of assisting you in selecting the particular Staco transformer
best suited for your application.
Contact our factory or visit the “Where to Buy” section of www.
StacoEnergy.com for the name of the distributors or sales representative
in your area.
For nonstandard products (to meet your special application needs) our
engineering staff will quickly respond with custom solutions to your
application requirements. Often a simple revision to a standard compo-
nent is all that is required, allowing us to keep your costs at a minimum.
Dimensions are provided throughout this
catalog in inches [millimeters].
Panel Mount, Single Phase — 120 and 240 Volt
Adjustable Shaft
100 and 200 Series
171, 201
221-B, 291
Part No.
Volts
Input
Hertz
Output
Constant
Current
Load
Max.
Max.
Amps. kVA
Constant
Impedance
Load
Max. Max.
Amps. kVA
Net Wt.
Lbs.
Volts
171
201
221-B
Type
171, 201
221-B, 252
291
A
1.88" (47.6)
2.12" (54.0)
2.31" (58.7)
120
120
120
120
240
291
252
50/60
60
50/60
60
50/60
60
50/60
60
50/60
60
0-120
0-132
0-120
0-132
0-120
0-132
0-120
0-132
0-240
0-264
1.75
1.75
2.0
2.0
2.50
2.50
3.0
3.0
0.8
0.8
0.21
0.23
0.24
0.26
0.30
0.30
0.36
0.40
0.19
0.21
2.2
—
2.5
—
3.2
—
3.5
—
1.0
—
0.26
—
0.30
—
0.38
—
0.42
—
0.24
—
2
2
2.5
2.5
2.5
500 Series
Part No.
Volts
Input
Hertz
Output
Constant
Current
Load
Max.
Max.
Amps. kVA
Constant
Impedance
Load
Max. Max.
Amps. kVA
Net Wt.
Lbs.
Volts
511
120
50/60
0-120
0-140
5.0
5.0
0.60
0.70
7.0
—
0.84
—
4.25
Adjustable Shaft
501C Series
Part No.
Volts
Input
Hertz
Output
Constant
Current
Load
Max.
Max.
Amps. kVA
Constant
Impedance
Load
Max. Max.
Amps. kVA
Net Wt.
Lbs.
Volts
501C
120
50/60
0-120
0-140
5.0
5.0
0.60
0.70
7.0
—
0.84
—
5.25
Variable Transformers
www.stacoenergy.com
Enclosed Cord and Plug Series
The cased plug-in models feature a ventilated steel case, input line cord and
plug, NEMA rated output receptacle, and an illuminated on/off switch. They are
connected for output voltage increase with a clockwise rotation, and the dials are
graduated from 0 - 100 percent of the voltage setting. For application flexibility,
two field modification kits have been added to the product line. The 3PN-MK
kit allows either the 3PN221B or 3PN501B to be wall, bench top, or machine
mounted. The 3PN-SK kit provides an adjustable voltage stop for either the
3PN1000, 3PN1200, or 3PN1500 Series.
Plug and Receptacle Styles
3PN 120 Volt Types
3PN 240 Volt Types
Input
Hertz
Output
Constant
Current
Load
Max.
Amps.
Max.
kVA
Constant
Impedance
Load
Max. Max.
Amps. kVA
Net
Wt.
Lbs.
Part No.
Volts
Volts
Height
Width Depth
3PN221B
3PN501B
120
60
50/60
0-132
0-140
2.50
5.0*
0.33
0.70
—
—
—
—
3
5.31
6.06 4.10
[134.9] [154.0] [104.2] 7.75
3PN-MK-Kit
Input
Hertz
Output
Constant
Current
Load
Max.
Amps.
Max.
kVA
Constant
Impedance
Load
Max. Max.
Amps. kVA
Net
Wt.
Lbs.
Part No.
Volts
Volts
Height
Width Depth
3PN1010B
3PN1210B
3PN1020B
3PN1220B
3PN-SK-Kit
120
120
240
240
50/60
60
50/60
60
0-140
0-120
0-280
0-240
10.0
12.0
3.5
5.0
1.40
1.44
0.98
1.20
—
15.0
—
7.0
—
1.80
—
1.68
5.50
4.62 6.96 10.25
[139.7] [117.4] [176.8]
5.50
4.62 6.96 10.25
[139.7] [117.4] [176.8]
5.50
4.62 6.96 10.25
[139.7] [117.4] [176.8]
5.50
4.62 6.96 10.25
[139.7] [117.4] [176.8]
Input
Hertz
Output
Constant
Current
Load
Max.
Amps.
Max.
kVA
Constant
Impedance
Load
Max. Max.
Amps. kVA
Net
Wt.
Lbs.
Part No.
Volts
Volts
Height
Width Depth
3PN1510B
3PN1520B
120
240
50/60
50/60
0-140
0-280
15.0
9.5
2.10
2.66
—
—
—
—
6.00
6.24 9.35
[152.4] [158.4] [237.4]
6.00
6.24 9.35
[152.4] [158.4] [237.4]
18
22
2200 and 2500 Series
Part No.
Input
Output
Constant
Current
Load
Constant
Impedance Load
Max.
Amps
Max.
kVA
HxWxD
(cm)
Net Wt.
Lbs.
Volts
Hertz
Volts
Max.
Amps
Max.
kVA
3PN2210B
3PN2520B
120
240
50/60
50/60
0-140
0-280
22.0
10.0
3.08
2.80
----
----
----
----
6.31x 7.95x 10.85
(160.3x202.1x275.6)
24.25
Variable Transformers
www.stacoenergy.com
Metered Models
Cased plug-in models of the 1010B, 1020B, 1510 and 1520 series are
also available with a pivot and jewel AC voltmeter or ammeter (+/- 5%
full scale accuracy) conveniently located atop the enclosure for easy
accurate readout. It is ideal for applications where voltage control is
necessary. The 120 volt types have 0-150V voltmeters and the
240 volt types have 0-300V voltmeters. Units with voltmeters
have the suffix“V” at the end of their part number. Units with
ammeters have the suffix “A.”
Input
Part No.
Volts
Hertz
Output
Volts
Current
HxWxD
(cm)
Net Wt.
Lbs.
3PN1010BV
3PN1010BA
3PN1510BV
3PN1510BA
3PN1020BV
3PN1020BA
3PN1520BV
3PN1520BA
120
120
120
120
240
240
240
240
50/60
50/60
50/60
50/60
50/60
50/60
50/60
50/60
0 - 140
0 - 140
0 - 140
0 - 140
0 - 280
0 - 280
0 - 280
0 - 280
10.0
10.0
15.0
15.0
3.5
3.5
95
.
95
.
5.50 x 4.62x 6.96
(139.7x117.4x176.8)
10.25
10.25
18
22
10.25
10.25
22
22
5.50x 4.62x 6.96
(139.7x117.4x176.8)
6.00x 6.24x 9.35
(152.4x158.4x237.4)
6.00x 6.24x 9.35
(152.4x158.4x237.4)
5.50x 4.62x 6.96
(139.7x117.4x176.8)
5.50 x 4.62x 6.96
6.00x 6.24x 9.35
(139.7x117.4x176.8)
(152.4x158.4x237.4)
6.00x 6.24x 9.35
(152.4x158.4x237.4)
Isolated Portable Cord and Plug Models
Input
Part No.
Volts
Hertz
Output
Volts
Current
HxWxD
(cm)
Net Wt.
Lbs.
3PNJ201B
3PNJ401B
120
120
50/60
50/60
0 - 140
0 - 140
2.
0
4.
0
5.50 x 4.62x 6.96
(139.7x117.4x176.8)
9
17
6.00 x 6.24x 9.35
(152.4x158.4x237.4)
Data is subject to change without notice.
Staco Energy Products Co.
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