Polyswitch Thermal Protection

A Polyswitch is an electronic fuse, which interrupts a protected circuit when the nominal current has been exceeded, but returns to its original state once it has cooled down.In reality, the Polyswitch performs the same function as a fuse, namely interrupting the current when this has reached an excessive level. The classical fuse simply gives up the ghost — it is either ‘ok’ or ‘blown’. There is no other solution then to replace it, once the electrical problem has been resolved. The Polyswitch however, may be returned to its serviceable state by switching off the power supply. It is no longer necessary to replace the fuse.