Magnetic proximity switches are a type of electromagnetic switch which controls the flow of electricity within a circuit. It is composed from at least two ferrous reeds in a small glass casing. Are magnetised and move when a magnetic field is moved towards the switch. Various contact configurations are available SPST (single pole, double throw). Features and Benefits As there is no physical pressure on the switch there is no standard wear and tear. No voltage is needed All models are reliable and compact Glass tubes encasing the reed switches ensures that they are protected from corrosion.