Descrioption for connecting up limit switches (reeds)

When an inductive circuit is disconnected it will release a voltage that may be more than double the operating voltage when using A.C. and when using D.C. the voltage may be up to 10 times the operating voltage. Besides, there will never be a "distinct and absolute" switching of the circuit which means that there will be repeated switching of the circuit. This voltage peak causes a surge through the reed and destroys them.

Suitable protections for the reeds is easily found on (for example):

Wiring diagramfor limit switches