electricalscho

An all-or-nothing relay energized via another relay. An example is a measuring relay, for the purpose of providing higher rated contacts, or introducing a time delay, or providing multiple outputs from a single input.

The power required for correct operation of an electrical or electronic device, supplied via an external auxiliary power source rather than the line being measured.

A transformer in which at least two windings have a common section. They are use to either “buck” or “boost” the incoming line voltage.

A stand-alone Photovoltaic system that has no back-up generating source. The system may or may not include storage batteries. Most battery systems are designed for a certain minimum number of days or operation before recharging is needed should sufficie

An automatic switch used to open then reclose following an over current event on a distribution voltage (medium voltage) line.