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'Potential transformers' (US terminology) or 'voltage transformers' (UK terminology) are, together with 'current Transformers', collectively called 'instrument transformers', and are used to safely measure/monitor voltages and currents in high-voltage systems.

Potential transformers are used to reduce the voltage-level of a high-voltage circuit to a lower voltage which can then be read using an ordinary voltmeter; at the same time, it electrically-isolates the high-voltage system for the purpose of safety. Potential transformers, together with current transformers, can also be used to operate wattmeters, or to supply protective relays.

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