- Over and under voltage testing of electrical and electronic equipment.
- Heat control of ovens, furnaces, infra-red heaters etc
- Testing and calibration of voltmeters, ammeters, watt meters etc
- Built in as an integral control element in electrical, electronic and automatic control and process equipment.
- Lighting control in theatres, auditoriums, hotels. Restaurants, photographic studios and darkrooms etc...
- Motor speed control either direct or through suitable circuits.
- Control of DC voltage and current through rectifiers. Control of rectifiers in electroplating etc
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