Normally Closed Magnetic Door Switch

Describes various ways of making a normally closed switch. What this means is if you have a magnetic contact usually consisting of a reed switch inside a plastic housing and a separate magnet in a matching plastic housing connected to a door when the door is closed the reed switch within the contact is closed and when the door is opened or the magnet and the contact are separated the reed. The internal reed switch is closed meaning the circuit is completed when the magnet is near the sensor meaning the door or window is closed.

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Normally closed magnetic door switch.

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A switch with one magnetic reed and one non magnetic one. Kwikee large rectangular magnetic door switch black. Black 4 plated plunger normally open. No normally open means that the internal switch is open when the magnetic module is against the switch module door is closed.

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