Popular
Variable Transformers
and AC Power Supplies
Product Guide
AC Voltage Control
Guide
Devices
Guide
TM
Your Tailored Power Solutions Provider
www.stacoenergy.comStaco Energy Products Co. has been a leading manufacturer of variable In addition to the basic styles illustrated, Staco Energy can meet your
transformers for over 65 years, building standard and custom- specific requirements with hundreds of additional standard model
designed products for industrial, commercial and military applications. variations and configurations from 0.8 to 450 amps, 120 to 575 volts,
Variable transformers have many industrial and laboratory applications 50 Hz and up. 480 volt units are shown on page 8 and in our Variable
as basic components to control voltage, current, power, heat, speed, Transformer Voltage Control Catalog (VT-5). These models include
light and electromechanical force. cased and uncased, single and three phase manual and motor driven
models, and complete voltage control systems. Complete information
A basic Staco variable transformer consists of a single layer magnet
is contained in our Variable Transformer Voltage Control Catalog.
wire winding on a toroidal core of laminated silicon steel. A carbon
brush, connected to an output lead, is rotated over a precision To serve your needs promptly, Staco Energy has a national network of
ground, plated commutator track to tap off voltage at any turn from stocking distributors to assure immediate off-the-shelf delivery. Your
zero to the maximum output voltage of the winding. local Staco distributors and representatives are factory trained, and
capable of assisting you in selecting the particular Staco transformer
Staco research has developed design features and proprietary pro-
best suited for your application.
cesses to provide longer lasting, more reliable products. Particularly
important is the high-temperature foundation material bonding the Contact our factory or visit the Where to Buy section of www.
coil securely to the core assembly. This material has a high thermal StacoEnergy.com for the name of the distributors or sales representative
transfer characteristic so that it dissipates heat from the brush contact in your area.
area, increases the heat distribution of the core itself, and provides
For nonstandard products (to meet your special application needs) our
the transformer with greater tolerance to transients and short-term
engineering staff will quickly respond with custom solutions to your
overloads.
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.
Some Models Are
Listed by the Canadian Standards Association Dimensions are provided throughout this
catalog in inches [millimeters].
File No. LR18948
Panel Mount, Single Phase 120 and 240 Volt
Adjustable Shaft
100 and 200 Series
Input Output
171, 201
Constant Constant
221-B, 291
Current Impedance
Net Wt.
Part No. Volts Hertz Volts
Load Load
Lbs.
Max. Max. Max. Max.
Amps. kVA
Amps. kVA
50/60 0-120 1.75 0.21 2.2 0 .26
171 120 2
60 0-132 1.75 0.23
50/60 0-120 2.0 0.24 2.5 0.30
201 120 2
60 0-132 2.0 0.26
50/60 0-120 2.50 0.30 3.2 0.38
221-B 120 2.5
60 0-132 2.50 0.30
50/60 0-120 3.0 0.36 3.5 0.42
291 120 2.5
Type A
60 0-132 3.0 0.40
171, 201 1.88" (47.6) 50/60 0-240 0.8 0.19 1.0 0.24
252 240 2.5
221-B, 252 2.12" (54.0) 60 0-264 0.8 0.21
291 2.31" (58.7)
500 Series
Output
Input
Constant Constant
Current Impedance
Net Wt.
Part No. Volts Hertz
Volts
Load Load
Lbs.
Max. Max. Max. Max.
Amps. kVA Amps. kVA
0-120 5.0 0.60 7 .0 0.84
50/60
511 120 4.25
0-140 5.0 0.70
Adjustable Shaft
501C Series
Input Output
Constant Constant
Current Impedance
Net Wt.
Hertz
Part No. Volts Volts
Load Load
Lbs.
Max. Max. Max. Max.
Amps. kVA Amps. kVA
0-120 5.0 0.60 7 .0 0.84
50/60
501C 120 5.25
0-140 5.0 0.70
Variable Transformers www.stacoenergy.com