Solid Core Current Transformers with 0-5V output. Current Transformers Solid Core Sentry 100 Series convert a monitored AC current to a proportional DC voltage of 0 to 5 Volts. Current Transformers Solid Core Sentry 100 Series are used to monitor motors, pumps, conveyors, machine tools and any electrical load where an analogue representation is required over a range of currents. Current Transformers (Transducers) Solid Core Sentry 100 Series models are CSA approved and UL listed. Current Transformers Solid Core Sentry 100 Series comprises a current transformer, range selector, rectifier-filter, and scaling circuit. Each sensor has three basic user selectable ranges. The 0-5 VDC output is available on two 6-32 screw terminals.