Was replacing the bathroom pull switch which also controlled the timed extractor fan and had an fan isolator switch in the circuitry. <br><br>When the light is turned on the fan automatically starts, when it is turned off the fan continues for a set amount of time. If the isolator switch is turned off the fan does not operate.<br><br>The old switch had the connections labelled as:<br><br>L1<br>L2<br>L3<br>L4<br><br>The new switch had:<br><br>Supply L<br>Supply N<br>Load L<br>Load N
