Detect current flow in 240v circuit

Thread Starter

Ian Cashmore

Joined Oct 12, 2015
Hi All,
I have installed a 240v tracer wire to stop my pipes freezing in winter. The tracer wire and thermostat are fully sealed with no indication for on or off. I would like to fit something inside the 240v fused spur to indicate if the device is on via a LED. The only way I can think of doing this is to measure the current drawn by the device and when it goes over a preset limit( say 500mA) it lights the LED.
Any ideas how I can do this.
Many Thanks


Joined Mar 30, 2015
You could use a current transformer or hall effect sensor. You could also sense temperature.