Established in 1998, China Dianshen Electric Co., Ltd. is a professional variable transformer manufacturer and variable transformers design of electric and electronic products. Together with the European 'CE', 'CCC', GS/EMC/LICE/UL/CSA, and 'CB' (IEC) certification that we have received for various series. Currently, our custom variable transformer product series are being exported worldwide. Our pursuit of first-rate quality, competitive and cheap variable transformers prices and comprehensive after-sales services offers both potential and long-standing clients confidence in our company.

Engineers, Scientists, Technicians working in laboratories on sensitive equipments have a need for Isolated mains supply, with a variable output Voltage. This facilitates them in testing various devices demanding different voltages & currents. It is also an Electrical Engg. practice to test devices by applying steadily increasing voltage from 0 V to the device rated voltage. To achieve the above objective, it is normal practice to use a Variac followed by a 1: 1 Isolation transformer or vice versa as shown in figure 1. This combination becomes very bulky (heavy) with two separate transformers, wiring or a combined bulky box. occupying much of test test bench space. This is more so as the current rating or VA increasing. It looses its mobility. Radio Electric has solved this problem by designing a "Double Wound Isolated Variac". This elegant & compact arrangement uses only ONE Transformer on a Single torroidal Core. This provides 2.5 kv Isolation between prim & sec, prim & body with a Variable Output Voltage from 0V to the required voltage. Various models are as Illustrated in table 1.

The contact variable transformer, we have produced, has no additional distortion and phase shift, high efficiency, high reliability, compact in volume and weight, long life and easy maintenance. Have wildly be applied to industry as chemical, metallurgical, instrument, machinery, education, research, home appliance, light dimmer, temperature control for variable voltage usage. By moving the carbon brush to change the contact position at the coil, then can continuously change the output voltage. High capacity, have no additional distortion, suitable to any type of load. Please note that this unit has exposed live parts and must therefore be used in a suitable enclosure and is only suitable for connection to an AC 250 V 50Hz supply.
Input voltage: Single phase 220V 50/60 Hz, three phase 380V 50/60 Hz
Output voltage: Single phase 0~250V, three phase 0~450V continuously variable
Capacity: 500VA ~800KVA.

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