Sontay Current Switches PM-H709HV. The Sontay PM-Hx09HV range of current switches can be used to monitor motors, pumps or other electrical loads where a switched output is required, the output can be used for simple run/fail detection. The current switch is fitted with smart LED status indication for status monitoring. Adjustable set point from 1 - 135A, frequency of 50-60HZ.