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Type of Switch
Contact type 1 = make contact
When approached by a magnet, the contact will be magnetised and closes suddenly (non-operative mode open).
Contact type 2 = break contact
When approached by a magnet, the magnetic field will be neutralised and the contact opens (non-operative mode closed).
Contact type 3 = change over contact
The change over contact can be considered as a make-contact. Polarity of the magnets do not have to be considered. Both poles (north & south) switch equally.
Contact type 4 = bistable contact
The switching of the contact is dependent on the polarisation and on the direction when approached by the magnet. The contacts remain in the position determined by the actuation magnets in the last cycle. The contact also stays in that position when a magnet with the same polarisation passes from the same direction. The switch position will be changed if this magnet is taken back or if a magnet with the opposite polarisation passes. A perfect actuation ensues only by passing a magnet lengthwise along the switch. In a frontal actuation, the bistable contact changes its switching status by during pole reversal of the magnet.
Open collector (NPN)
The contact of a magnetic sensor with Hall element is an open collector NPN-transistor (negative switching, off = HIGH). When actuating, the output switches the load-resistor to negative so that current flows from the resistance into the sensor.
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