Triad Magnetics' CST25 series of current sense transformers are ideal for monitoring currents in high-frequency applications such as switch-mode power supplies and LED lighting. The series is offered with built-in sense winding allowing for ease of use. These current sense transformers are fully encapsulated allowing for high isolation of 4,000 V_AC between primary and secondary windings. There are five different popular turn ratios available from which to choose.