Quick Links

Plug and Cord Models

Panel Mount, Single Phase - 120 and 240 Volt

Isolated Models

Motor Driven Models

Cased Models

Product Design & Engineering Data

Ganged Units

Controllers

 

Interchangeability Chart (.pdf)

Product Quick Selector (.pdf)

How to order and specify variable transformers

Product Terms and Connection Information

Schematics & Wiring Diagrams (.pdf)

Variable Transformer Catalog
(.pdf 10 MB)

Engineering Drawings

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.

Quick Links

Interchangeability Chart (.pdf)	Product Quick Selector (.pdf)	Engineering Drawings
Plug and Cord Models	Panel Mount, Single Phase - 120 and 240 Volt	Isolated Models
Motor Driven Models	Cased Models	Product Design & Engineering Data
Ganged Units	Controllers	Schematics & Wiring Diagrams (.pdf)

 

Plug and Cord Models

	3PN1010B	0-10 Amps. Bench testing unit, includes indicator light.	Engineering  Drawing	Brochure
	3PN1010BV	0-10 Amps.  Bench test unit w/indicator light and meter.	Engineering  Drawing	Brochure
	3PN1510B	0-15 Amps.  Bench test unit w/indicator light.	Engineering  Drawing	Brochure
	3PN2210B	0-22 Amps. Bench test unit w/indicator light.	Engineering  Drawing	Brochure
	3PN221B	0-2.5 Amps.  Test unit w/indicator light.  Wall mountable.	Engineering  Drawing	Brochure
	L-Series	Fully enclosed.   2.0 - 22.0 Amps. Plug and cord model.	Engineering  Drawing	Brochure

 

Panel Mount, Single Phase Variable Transformers

	100 and 200 Series	Panel mount, single phase, fixed shaft.   120 or 240 volt. 0.08 to 3.0 max amps constant current load.	Engineering  Drawing	Brochure
	500 Series	Panel mount, single phase, fixed shaft. 120 or 240 volts.  5.0 max amps constant current load.	Engineering  Drawing	Brochure
	1000 and 1200 Series	Panel mount, single phase, adjustable shaft, 120 or 240 volt, 3.5 - 10.0 max amps constant current load.	Engineering  Drawing	1000 Series Brochure 1200 Series Brochure
	1500 Series	Panel mount, single phase, adjustable shaft, 120 or 240 volt, 9.5 - 15.0 max amps constant current load.	Engineering  Drawing	Brochure
	2500 Series	Panel mount, single phase, adjustable shaft. 120 or 240 volt, 10.0 - 25.0 max amps constant current load.	Engineering  Drawing	Brochure
	5000 Series	Panel mount, single phase, adjustable shaft.  120 or 240 volt, 10.0 - 28.0 max amps constant current load.	Engineering  Drawing	Brochure
	6000 Series	Panel mount, single phase, adjustable shaft.  120 or 240 volt, 35.0 - 60.0 max amps constant current load.	Engineering  Drawing	Brochure

 

Isolated Series

	Isolated Series	Bench or panel mount, 120 or 240 volt, 2.0 - 25.0 max amps constant current load. Wiring avail. for Isolated, non-isolated & voltage doubler.	Engineering  Drawing	Brochure
	Isolated Series	Cord and plug model with isolated transformer.  120 volts, 2.0 or 4.0 amp output current.	Engineering  Drawing	Brochure

 

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. 

To download a PDF version of our brochure, click here.  For more information, contact your local sales representative or call us directly.  

 

 

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."

Engineering Drawings

 

 

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."

Engineering Drawings

 

 

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.

More Information about the MP Controller (.pdf)

Engineering Drawings for MP Controller

 

 

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.

More Information about the FRC-20 Controller (.pdf)

Engineering Drawing for FRC-20