Variable Transformers, often generally referred to as Variacs, Variac Auto Transformers, Variable Auto Transformers, Dimmer, Variation Transformers, Voltage Regulator etc are widely used when adjustable voltages are required for quality control testing, electronic equipment burn-in, life-tests, low voltage performance evaluation, D.C. rectifier/regulator analysis or other industrial and engineering applications.

Variac transformers have many industrial and laboratory applications as basic components to control voltage, current, power, heat, speed, light, and electromechanical force.

Bench Top Variacs are widely used in Service Shops, Industrial & Academic Laboratories, Engineering Design Facilities, Manufacturing Operations and Field Installation Teams. Inherent portability makes these units valuable in instances where actual operational parameters need to be ascertained.

VOLTAGE RATING:
RAVISTAT Variable Transformers are rated 240 volts Input and 0-270Volts output. Similarly, three 240-volt units are ganged in a star connection to result in a 470-volt line-to-line three-phase assembly. For 480-volt open delta applications, two 240-volt units are used in series in each of the two legs of the open delta assembly. In any of the above voltage applications, higher current requirements are met by paralleling two or more units in the ganged assembly.

EFFICIENCY & REGULATION:
In contrast to inefficient, wattage-burning resistive-type controllers such as rheostats, RAVISTAT Variable Transformers have an extremely low power loss and efficiencies as high as 98%.
RAVISTAT Variable Transformers deliver any desired voltage (within the transformer rating) with negligible variation in output voltage from no-load to full-load current. Individual regulation curves for all types are shown in the product section.

DISTORTIONLESS VOLTAGE CONTROL:
RAVISTAT Variable Transformers produce an accurate transfer of input wave to output circuit, providing distortionless voltage control (a requisite of many sophisticated electronic applications).

PLATED COMMUTATOR SURFACE:
The commutator surface(track) of each coil is specially plated with precious silver metal and chemical compound such as silver salt, giving RAVISTAT commutators longer life, increased resistance to corrosion and the capacity to withstand greater overloads (while maintaining a constant contact voltage drop).

SIMPLE INSTALLATION AND CONNECTION:

Mounting of RAVISTAT units is convenient and easy. Most Series units are designed with an adjustable shaft to accommodate either bench or panel mount (adjustable to accommodate varying panel thickness). Terminals are easily accessible; screw, lug or solder design. Connections deliver increasing output voltage with either clockwise or counter-clockwise knob rotation. Manually operated units have standard dials graduated 0-100% or 0-270V (output voltage).

LONGER LIFE WITH NEGLIGIBLE MAINTENANCE:
Precise design assembly of the brush (at a constant pressure to a smoothly finished and securely bonded commutator surface) provides excellent mechanical performance, long life, and low-driving torque. Brush replacement is seldom needed, but it is easily performed. High safety margins of voltage, current-carrying capacity and dielectric strength are why you can expect longer life from RAVISTAT Variable Transformers.

TEMPERATURE & RATING:
The low loss of RAVISTAT Variable Transformers allows operation at full current rating @ ambient temperatures up to 45 degrees C.

RUGGED MECHANICAL CONSTRUCTION:
RAVISTAT Variable Transformers are precision built to exacting mechanical tolerances using the finest materials available. Quality assurance inspections are performed to insure that the high designed-in quality is maintained throughout the manufacturing cycle. A RAVISTAT Variable Transformer provides accurate, reliable and lasting voltage control for a broad variety of applications.