Variable Autotransformers

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Radiotone Double Layer Roller Contact Vertical Variable Autotransformer(colloquially known as Variac) is also a 3 phase transformer, however, with each limb having one winding inside. The top winding is connected in series with inside winding. The Carbon brushes are on the outer load winding.

Radiotone Double Layer Roller Contact Vertical Variable Autotransformers (colloquially known as Variac) has special application in Servo controlled Voltage Stabilizer with balanced loads & balanced input conditions. It can also be used for unbalanced load conditions up to a certain extent. This eliminates the requirement of 3 phase buck boost transformer, thus making the Tank Size very compact.

Further models are under development.

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Radiotone Special Roller Carbon Brush Variable Autotransformer (colloquially known as Variac) uses Roller brushes and these roller brushes are manufactured from special graphite slabs & have a metal insert. The movement of the carbon brush on the Variable Autotransformer track is with minimum friction. Thus it is very very smooth & effortless. It also ensures longer life.

Models : 2A, 4A, 8A, 10A

Higher rated models of Radiotone Special Roller Carbon Brush Variable Autotransformer available for Oil Cooled applications.

Models for Oil cooled : 15A, 20A, 28A

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Radiotone Single Phase Variable Autotransformer (colloquially known as Variac) offered by Radio Electric Pvt. Ltd. is a simple & rugged method to control power, voltage & current. They are designed for heavy duty continuous use. They can provide high current rating & overload capacity. Radio Electric specializes in the designing of tailor made Variable Autotransformer (colloquially known as Variac).

Single & Three Phase Panel (F) Mounting

Dimensions & Weight are subject to change at the discretion of the manufacturer

The picture above is a motorized version of Radiotone Single Phase Variable Autotransformer (colloquially known as Variac). We manufacture it using top quality motors, Micro Switches and with rugged construction. The side studs and center shaft are well insulated from each other to avoid completion of magnetic circuit. Radiotone Single Phase Variable Autotransformer (colloquially known as Variac)Models available are 2 Amp, 4 Amp, 6 Amp, & up to 35 Amp. For Models above 40 Amp, we use side wiping contacts. The commutator surface on these coils is machine processed and hence is very even and smooth. This ensures very less torque for the motor, thereby enhancing its life.We specialize in tailor made Radiotone Single Phase Variable Autotransformer (colloquially known as Variac) to suit customers exact current requirements. This helps the customer select a proper rating suitable for his application (For eg. If the customer''''s actual upper limit of current is 20 Amp on a continuous basis and in the Extended Voltage range, then we recommend a higher rating Variable Autotransformer (say 23Amp) & then tailor make it for his application. We also take care to cover up his entire Voltage range (either 0-230 V, 0-260V, 0-110V etc.) We can provide Roller Carbon Brushes fabricated from a Special Electrical grade for these Single Phase Variable Autotransformers (colloquially known as Variac).

Portable (Enclosed ) Models are available in the entire range.

RADIOTONE VARIAUTO :-

This variauto is a continuously variable Auto Transformer used for smooth control of Voltage.

STANDARD RANGE :-

1. 0.75 Amp, 0-270V
2. 2 Amp to 100 Amp, 0-270V
3. Single /Two/Three Phase
4. Open Type /Enclosed Type
5. Air/Oil Cooled.
6. AC Motorised Version

SPECIFICATIONS :-

No Load Current (NLC) Less than 2% of rated capacity Testing: as per B.I.S. 5142

TAILOR MADE 110V / 400 Hz. at required current ratings possible.

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• Easy to maintain & service
• Preferred for safety reasons over oil cooled
• Models : 100A /200A /400A /600A /800A /1200A
• Input/output is provided on tinned copper bus bar.

Single Phase High Current Air Cooled Variable Auto transformers each of 200A rating (Radio tone make)

We specialize in the manufacturing of Single Phase High Current Air Cooled Variable Auto transformer (colloquially known as Variac) in 100A /200A /400A /600A /800A /1200A ratings.

Three Phase units are built by using such three stacks & motorizing them on common shaft. This is a substitute for oil cooled units which are less preferred, for safety reasons, in many hazardous applications.

Single Phase High Current Air Cooled Variable Auto transformers (colloquially known as Variac) are very easy to maintain & service. Enclosed units are also available.

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This is a very compact motorized Variable autotransformer (colloquially known as variac) which uses the coil cavity to fit the motor assembly. We use roller brushes in this product for low torque and smooth operation. The speed of the motor can also be varied (time span for one rotation) by varying the DC voltage.

Radiotone Variable Autotransformer with Built in DC Motor

• Models from 2A to 15A in both single layer & double layer
• Very compact, with no assembly
• Ideal for EXPORT as it drastically reduces the size and weight of equipment like HV Tester, SCVS, Power supplies, etc.

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We offer Single Layer Three Phase Variac AutoTransformers to our clients. We specialise in tailor made Vari auto depending on the customers exact current requirements. This helps the customer select a proper rating suitable for his application (For eg. If the customer''''s actual upper limit of current is 20A on a continuous basis and in the Extended Voltage range, then we recommend a higher rating Vari aoto (say 23A) & then tailor make it for his applications. We also take care to cover up his entire Voltage range (either 0-230 V, 0-260V, 0-110V etc.) We can provide roller carbon brushes fabricated from a special electrical grade.

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Radiotone Single Layer Variable Autotransformer. (colloquially known as Variac) are very small in size (82 mm Dia) variable autotransformers. In same size we can also make from 0 to 25V at 5A or 0 – 50V @ 3A and for 400 Hz applications.Radiotone 0.5 A, 0.75 A, 1.2 A single layer variable autotransformers (colloquially known as variac) are used in instrumentation, HV testers & aviation (400 Hz). All the models are coated for physical protection as shown in the picture. We use roller brushes for very smooth long lasting & arc free contact.

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Radiotone Three Phase Enclosed Variable Autotransformer (colloquially known as Variac) models are generally used in laboratories, educational institutions, test benches for testing various industrial equipment. They can be provided with MCB, indicators and switch gear as required.

Radiotone Three Phase Variable Autotransformer open construction models from 2A to 60A can be enclosed and freely movable trolley can be provided. Output voltages can be tailor-made as required.