Selected:

Single Phase Variac

From: $285.00

Single Phase Variac

(1 customer review)
Clear

A variable auto transformer provides continuously adjustable AC voltage. In it’s Auto transformer form it is an efficient, reliable method of controlling AC voltage from zero to line voltage by amplitude modulation of the AC waveform. Since the current, power, heat, light and motor speed are further functions of the voltage, the Dimmer Dot Variable Transformer finds its varied use, but is not designed to provide AC mains isolation.

Air cooled – single and three phase:

Air cooled units are a cost effective, trouble free device to provide continuously adjustable voltage for AC supply equipment.
Air cooled units are light weight and easily transported. When used correctly they give many years of reliable service.

SALIENT FEATURES:

The Variable Transformer, consists of a single-layer winding on a toroidial silicon-steel core. As the control knob is rotated, a carbon brush traverses the winding, tapping off a portion of the total voltage across the winding. The brush is in continuous contact with the winding, and the voltage between turns is always less than 1 volt even in the largest model. In the smallest model it is only about 0.3 volt. The discrete voltage increments obtained as the knob is rotated are always less than the voltage between turns. Since the brush spans more than one turn, the change in voltage is practically continuous. The brush is so designed that excessive heating cannot occur in the turns that it spans. Dimmer Dot has many operating advantages over any other manually operated voltage control devices for alternating current use

Air cooled versions are available in either:

Portable / Bench top (P) which are designed to sit on a bench or floor.

They are enclosed in a protective square casing with convenient carry handles for easy transport.
New square shape design enables easy mounting of external equipment, such as mounting blocks for GPO’s, etc.
Single Phase units have Rubber feet while Three Phase units have ball transfer units or steel feet.
Single Phase units can be rear mounted in an electrical enclosure, simply by removing the rubber feet.
Single Phase units up to 15 Amp have an AC flexible cord only, fitted.
Open back / Panel mount (OB) which are designed to be mounted behind a panel for easy installation into electrical enclosures, where only the support bolts and control knob are protruding.
Single Phase units can be rear mounted in an electrical enclosure, simply by removing the rubber feet.
Single Phase units up to 15 Amp have an AC flexible cord only, fitted.

Open back / Panel mount (OB) which are designed to be mounted behind a panel for easy installation into electrical enclosures, where only the support bolts and control knob are protruding.

Features:

Good Regulation
Output voltage is substantially independent of load.

Smooth Control
The Dimmer Dot can be set very closely to any output voltage within its range.
 
High Efficiency
Very low losses under all load conditions. Greater than 96% efficient.
 
Long Life
With the exclusive Dura Dot contact surfaces, the life of the Variable Auto Transformer is essentially the same as that of any standard fixed-ratio power transformer.
 
Linear Output Voltage
Output voltage is continuously adjustable from 0-112% of line Voltage by approximately 340 degreee dial movement. The dial reads directly in no-load output voltage at rated line voltage or some dials are calibrated for percentage of the full range control.
 
Mechanical Design
Rugged construction and robust parts. Two or more units can be ganged on same shaft. Shaft is also reversible for simple conversion from front to back of panel mounting.
 
Temperature
High ambient temperature tolerance. Current rating up to 45c
 
Sine Wave Purity
Virtually no radio interference, wave shape distortion or harmonics created, unlike SCR-Thyristor and Triac AC power controls.
 
Lower Input Current
Input power consumption is proportional to output unlike electronic Thyristor controllers which still maintain high input RMS currents.
 
Special Voltage Range

Available in standard Single phase 240V and Three Phase 415V 50Hz. Other special input voltages can be supplied.

Two phase models are also available.

Technical Assistance
Our engineers are well qualified to advise and assist you with the selection and applications on the Variable Transformers.

Warranty
12 months from date of purchase.

Models:

Part NumberNorm AmpsCont AmpsDimensions (l x w x h)Weight
DP-21-P2A1.9A145mm x 155mm x 155mm4.5kg
DP-41-P4A3.9A175mm x 220mm x 180mm9kg
DP-81-P8A7A185mm x 220mm x 218mm12kg
DP-101-P10A9A205mm x 235mm x 205mm13kg
DP-151-P15A12A240mm x 265mm x 230mm18kg
DP-201-P20A17A270mm x 325mm x 265mm22kg
DP-281-P28A23A315mm x 380mm x 265mm31kg
DP-841-P84A63A360mm x 440mm x 670mm98kg

Singles Phase Portables   (Open Style and 3 Phase also Available – Please Enquire direct.)

Note: Most units come with only a Mains Input Lead (No Plug) and Stud Terminals on output.  No Mains socket. 

CAUTION: These units are Mainly for Lab and Electrical Testing Use by Qualified People, as they do not Isolate the Mains, and can be an electrocution Hazard if not used properly.

Note: An “Output Fuse” is Mandatory for protection and warranty purposes. They are Not intended or recommended for Domestic Home Use.

See the Special Models Below with Pluggable Power Cord and Mains Outlet socket and saftey

Options for general use if you are not Electrical Trade Qualified.  Enquire here further details

Additional information

WeightN/A
DimensionsN/A
Product Rating

0-270V 10Amp, 0-270V 2Amp, 0-270V 4Amp, 0-270V 8Amp, 0-270V 15Amp, 0-270V 20Amp, 0-270V 28Amp

Product Enquiry
reCAPTCHA

1 review for Single Phase Variac

  1. Ken

    Got a 2amp Variac from tortech for laboratory purposes. Built and Works Well. Thank-you Kamal for your support over the phone.

Add a review

Your email address will not be published. Required fields are marked *

Close Menu
×

Cart

Item 1 – Cast Resin type Isolation Transformer

HV Winding 1

LV Winding 1

LV Winding 2

Rated power

kVA

315

1250

1250

Rated voltage

kV

33

0.48

0.48

Frequency

Hz

50

Off circuit tapping links

%

±2.5%, +-5%

Nil

Nil

Connection

Delta

Star

Star

Vector group

Dy11y11

Insulation level (Maximum BIL/AC)

kV

150/70

10/3

10/3

Winding material

Aluminium cast windings in quartz filled self-extinguishing epoxy resin

Aluminium cast windings in quartz filled self-extinguishing epoxy resin

Aluminium cast windings in quartz filled self-extinguishing epoxy resin

Type of winding

Vacuum Resin Cast

Vacuum Resin cast

Vacuum Resin cast

Standard

AS 60076-11, AS 2374

Installation

Indoor

Degree of protection

IP22

Type of cooling

AN/AF

Installation altitude

< 1000 a.m.s.l

Climatic/environmental

And fire behaviour class

E2-C2-F1

test