1. AC (alternating current) transformers, voltage converters, voltage regulators, cycloconverters, and variable frequency transformers

2. Electric transformers, audio-frequency transformers, current transformers, distribution transformers, step up transformers, step down transformers, welding transformers

3. The new method uses the same current transformers that are customary for measuring purely residual alternating currents.

4. Control systems such as control panels, current transformers, potential transformers, protective relays, and associated circuitry, that monitor, control, and protect the power conducting components.

5. Alternatively available with current transformers with secondary currents of either 1 A or 5 A, the arc fault current is detected by measurement transducers positioned upstream of each feeder circuit-breaker.