This is a magnetic switch module with xh-2.0-4P interface. It is based on encapsulated dry reed switch which is single-pole single throw type having normally open ruthenium contacts. The sensor can be actuated with an electromagnet a permanent magnet or a combination of both. The magnetic switch is a wonderful tool for designers who would like to turn a circuit on and off based on proximity. The SIG pin of the module outputs low level. When a magnet approaches the switch the magnetic switch closes and the SIG pin outputs high level.
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