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Application Notes
Isolation Transformers - Variable Output
Voltage Regulators - Variable Output

Engineers, Scientists and Technicians have asked us for Variac Adjustable Voltage Regulators & Isolation Transformers. They indicated experimental laboratory applications, equipment testing application and long term application within production departments.

To Satisfy this need, we have designed Variable Voltage into our Voltage Regulator & Isolation Transformer families. As always, we offer our expertise to help you solve problems related to unique or troublesome industrial engineering applications.

These Application Notes  presents information relating to Variac Variable Voltage output configurations and some related uses in industry and scientific endeavors.

Isolation Transformers - Variable Output

Traditionally, isolation transformers have been utilized in several broad applications.

1. Safety

Maintenance personnel often work on energized electrical and electronic equipment. An isolation transformer positioned between incoming power mains and equipment undergoing maintenance provides a "floating" power source which isolates the engineer or technician from hazards associated with working on "live" circuits.

A variac operating in conjunction with the isolation transformer permits personnel to safely alter equipment voltages to specified operating levels.

In addition, maintenance or test laboratories often use the variac / isolation transformer combination to obtain operating data for over-voltage and under-voltage conditions so vital for long term reliability.

2. Interference reduction

Noise and  interference transfer from primary to secondary can effectively be reduced either by positioning individual primary and secondary windings on separate bobbins located adjacent to one another. This effectively reduces capacitance between primary / secondary, which reduces electrical noise coupling.

Another design technique employed to reduce inter-winding capacitance for electrical interference reduction is the Faraday shield. This is a metallic, usually copper, shield placed between the primary and secondary windings.  This shield is usually connected to ground and effectively reduces inter-winding capacity by 50%.

Again, a variac is often used to establish the specified operating point.

Also, interference can be reduced in some equipments by choosing an optimum operating voltage - a situation easily augmented with the variac - isolation transformer configuration.

Voltage Regulator - Variable Output

Normally Voltage Regulators are employed to reduce wide power line voltage swings for consistent operation.  Best regulation, and hence most consistent equipment performance, is achieved with a ferroresonant regulator. 

So called regulators, tap-changers or voltage-jumpers, correct voltage irregularities by jumping in 7 - 10 volt steps! This will not lead to consistent operation, as these voltage jumps will pass through the variac to equipment.

By employing a ferroresonant Voltage Regulator / Variac combination, stable operating conditions can be established and maintained.

Other Uses of Variac controlled conditioned power

Plastic foam is often formed with a hot wire cutting tool.  More precise applied voltage to the cutting tool ensures more precise plastic foam cutting.

Many chemical processes require tight temperature control. True, quality thermostats will hold the temperature to tight tolerances, but some engineers have found that supplying precise regulated power to the thermostat controller results in even better chemical processing due to the tighter temperature control.

Photography lights are sensitive to applied voltage.  Subtle color changes can be traced to applied voltage variations. 
Use of a Variac controlled variable voltage regulator can stabilize these subtle color shifts, resulting in consistent photography results, less photographer frustration and greater client satisfaction.

Please recommend these Application Notes to a friend or colleague

Click to Learn More About
Voltage Regulators
Isolation Transformers
Variacs <> Variable AutoTransformers

Product Details Below

Isolation Transformers - - Variable Output

<> operate from 120 Volts, 60 Hz power (Consult us for 240 Volts, 50 or 60 Hz units)
<> output voltage can be varied from approximately 0 to 127 Volts
<> Input Power
............ 1 thru 14 Amp Units:  6 foot power cable with standard US 15 Amp (NEMA 5-15) plug
............ 16 & 20 Amp Units: 6 foot power cable with US Twist Lock 30 Amp (NEMA L5-30) plug
<> Sockets
............ 1 thru 14 Amp Units: standard US 15 Amp (NEMA 5-15) sockets
............ 16 & 20 A Units: standard US 20 A (NEMA 5-20) sockets (will accept 15 or 20 Amp plugs)
<> External Control knob with graduated dial plate

PRICES
Kleen Line Variable Voltage Isolation Transformer
with exclusive Input Filter-Suppressor Protection

All Models are 125 Volts, 60 Hertz input/output
(250 Volt, 125/250 Volt, 250/125 Volt 50 or 60 Hertz Models available on Special Order)
Note:  Number of available sockets may vary from  Isolator Transformer specification

Contact factory for 125/250 Volts, 208 Volts, 250 Volts or 50 Hz configurations

Check Our Meter Options

NOTE:
Models ISOT-16-VAR and ISOT-20-VAR require NEMA L5-30 wall socket and are shipped with standard U.S. 20 Amp (NEMA 5-20) sockets which accept 15 or 20 Amp plugs

NEMA L5-30 socket configuration

Go to ........... Order Desk

<> <> <> <>

Voltage Regulators - - Variable Output

<> operate from 120 Volts, 60 Hz power (Consult us for 240 Volts, 50 or 60 Hz units)
<> output voltage can be varied from approximately 0 to 127 Volts
<> Input Power
............ KLR-250 thru KLR-1500:  6 foot power cable with standard US 15 Amp (NEMA 5-15) plug
............ KLR-2000 & KLR-2500: 6 foot power cable with US Twist Lock 30 Amp (NEMA L5-30) plug
<> Sockets
............ KLR-250 thru KLR-1500:  standard US 15 Amp (NEMA 5-15) sockets
............ KLR-2000 & KLR-2500: standard US 20 A (NEMA 5-20) sockets (will accept 15 or 20 A plugs)
<> External Control knob with graduated dial plate

PRICES
Kleen Line Variable Voltage Regulator
with exclusive Input Filter-Suppressor Protection

All Models are 125 Volts, 60 Hertz input/output
(250 Volt, 125/250 Volt, 250/125 Volt 50 or 60 Hertz Models available on Special Order)
Note:  Number of available sockets may vary from  Kleen Line Voltage Regulator   specifications

Contact factory for 125/250 Volts, 208 Volts, 250 Volts or 50 Hz configurations

Check Our Meter Options

NOTE:
Models KLR-1875-VAR, KLR-2000-VAR & KLR-2500-VAR require NEMA L5-30 wall socket and are shipped with standard U.S. 20 Amp (NEMA 5-20) sockets which accept 15 or 20 Amp plugs

NEMA L5-30 socket configuration

Go to ........... Order Desk

Options -  Variable Voltage Regulators and Variable Isolation Transformers

<> <> <> <>

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