StacoVT

Variable Transformer 120-600 VAC, up to 1000 kVA
Continually variable output voltage that can be adjusted from 0 to 117% of the unit’s input.
(1010B rated at 120VAC and 1.56 kVA shown)

Staco Energy Products' full range of variable transformers offer the exceptional versatility and reliability required for so many of today's voltage control applications in both industrial and laboratory environments.

Unlike a standard fixed ratio transformer, a Staco variable transformer is designed to provide variable output voltage that can be adjusted from 0 to 117% of the unit's input voltage.

Staco Energy Products Co. offers a wide range of standard models including the following:

Panel mount, single phase (fixed and adjustable shaft)
Enclosed cord and plug
Metered
Fully enclosed
Ganged
Isolated
Isolated portable cord and plug models
"Quick-Step" motorized
Motor driven
Cased

A basic Staco variable transformer consists of a copper winding on a toroidal core of laminated, grain-oriented, silicon steel. A carbon brush, connected to an output terminal, is rotated over the length of a precision-ground, precious metal-plated, commutator track to tap off voltage at any turn from zero volts to the maximum output voltage of the winding.

Unlike a standard fixed ratio transformer, a Staco variable transformer is designed to provide variable output voltage that can be adjusted from 0 to 117% of the unit's input voltage.

Staco Energy Products Co. offers a wide range of standard models including the following:
Panel mount, single phase (fixed and adjustable shaft) Enclosed cord and plug Metered Fully enclosed Ganged	Isolated Isolated portable cord and plug models "Quick-Step" motorized Motor driven Cased

To view our Certified Product Listing click here.

Ganged Variable Transformer Assemblies

High Current Models

By ganging variable transformers with a common rotor shaft wiring the outputs in parallel, the output current can be greatly increased. The models listed here are capable of output currents up to 315 amps. Other models are available in a variety of ranges.

Three Phase Models

All of Staco Energy Products' variable transformers can be ganged with a common rotor shaft and wired for three phase operation, in either open Delta or Wye configuration. For more information, contact your local sales representative, or call the factory directly.

Accessories and Other Configurations of Standard Models

Cased Models

Transformers of the 1010B through 6011 series are available in either "C" style (featuring protective screening over the coil assembly only) or the "CT" style (which also includes a terminal box cover with knockouts to accept conduit. Example part numbers are "1510C, 2510CT."

Motor-Driven Models

For applications requiring remote or automatic voltage control, a driving motor can be added to all models of the 501C through 6011 series. Standard motor speeds are: 5, 15, 30 and 60 seconds of travel, and so are designated by the prefix "M." For example: "30M1510."

Controllers

MP Microprocessor Controller

Our MP series of Microprocessor provides for easy interface of computer and process controller to Staco Energy Products' motor driven variable transformers. It is capable of several operational modes with selectable control ranges - tunable for various motor speeds, output voltage ramping, and feed back voltage. Custom options are available.

The microprocessor can be controlled with the microterminal, process control set point, or a bi-directional communications port such as RS-232 or RS-422. The variable transformer regulation is maintained at +/-0.5 volts. The MP controller is available with one, two or three channels for control of up to three motorized variable transformers or individual phase control of a three phase unit.

FRC-20 Controller

The FRC-20 controller is designed to position and regulate any Staco motor driven variable transformer. It can be controlled with a 0-5 VDC or 4-20 Ma set point, a 1k ohm potentiometer, or a fixed resistor network.

It maintains a full range regulation of 0.5%, and a limited range regulation of 0.25%. This unit is field configurable for feed back voltages up to 600 VAC, full range/limited range, and type of control. Each FRC-20 includes a 1 amp motor supply fuse and a set point supply trim potentiometer. It is a compact package, and can be easily mounted on the motor plate or inside an enclosure. Contact your sales representative or the factory for current and other feed back alternates.

Single or Three Phase:	Single Phase
Input Voltage:	up to 120
Max Output Voltage:	0-132
Frequency:	60
Frequency (Hz):	60
Amps Range:	0 - 25
Max Amps:	1.75
Plug & Cord:	Yes
Ship Weight (Lbs):	5
Voltage Doubler:	No
Open or Enclosed:	Cased
More Information:	Click Here

Single or Three Phase:	Three Phase, Open Delta
Input Voltage:	up to 120
Max Output Voltage:	0-132
Frequency:	50 Hz Compatible
Frequency (Hz):	50/60
Amps Range:	0 - 25
Max Amps:	1.75
Plug & Cord:	No
Ship Weight (Lbs):	5
Voltage Doubler:	No
Open or Enclosed:	Open
More Information:	Click Here

Single or Three Phase:	Single Phase Series
Input Voltage:	up to 240
Max Output Voltage:	0-240
Frequency:	50 Hz Compatible
Frequency (Hz):	50/60
Amps Range:	0 - 25
Max Amps:	1.75
Plug & Cord:	No
Ship Weight (Lbs):	5
Voltage Doubler:	No
Open or Enclosed:	Open
More Information:	Click Here

Single or Three Phase:	Three Phase, WYE
Input Voltage:	up to 240
Max Output Voltage:	0-240
Frequency:	60
Frequency (Hz):	60
Amps Range:	0 - 25
Max Amps:	1.75
Plug & Cord:	No
Ship Weight (Lbs):	8
Voltage Doubler:	No
Open or Enclosed:	Open
More Information:	Click Here

Single or Three Phase:	Single Phase Parallel
Input Voltage:	up to 240
Max Output Voltage:	0-280
Frequency:	50 Hz Compatible
Frequency (Hz):	50/60
Amps Range:	0 - 25
Max Amps:	20
Plug & Cord:	No
Ship Weight (Lbs):	63
Voltage Doubler:	Yes
Open or Enclosed:	Cased
Extras:	enclosed terminals
More Information:	Click Here

Single or Three Phase:	Single Phase Series Parallel
Input Voltage:	up to 480
Max Output Voltage:	0-480
Frequency:	50 Hz Compatible
Frequency (Hz):	50/60
Amps Range:	51 - 75
Max Amps:	70
Plug & Cord:	No
Ship Weight (Lbs):	354
Voltage Doubler:	Yes
Open or Enclosed:	Enclosed
More Information:	Click Here