Quote Originally Posted by elkangorito View Post
After you've experienced problems like these, it's a good idea to perform an insulation resistance test on the motor (& the extension lead while your at it). If foreign matter inside a motor has been causing earth leakage current, it's also likely that some debilitation of the winding insulation may have occurred.

For a single phase motor, no greater than 500v should be used in an insulation resistance test. If the results of the test show less than about 10 Megohms, you may have ensuing problems. If the results are close to 1 Megohm or less, the tested device is dangerous & needs to be repaired or replaced.
There were absolutely no dust inside the motor it was solely on the magnetic switch and, yes, it has been tested, no damage done.
Sometimes I wonder why we put in such a sensitive switch but then, when we remember it saved my brother's life we are grateful
Thanks for the advice
Wolffie