Autotransformers - uv-technik international ltd. uv lamps, uv units and uv equipment

Autotransformer-choke ballasts

For lamp output in the range between 6 … 9 kW, an autotransformer-choke ballast usually suits best. In most cases, this solution is less expensive than a leakage-field transformer.

An autotransformer  typically transforms the mains voltage to
660 Volts. This enables the use of chokes, connected in parallel if necessary, to operate a lamp. Depending on the design of the chokes, the operation at various steps is also possible, up to an operating voltage of the lamp of approx. 320 to 450 Volts; the typical value is 440 … 450 Volts. Up to a voltage of 660 Volts, commercially available contactors can still be used; these are usually also suitable for voltages of up to 690 Volts.