5 Paar MC-38 Kabelgebunden Tür Fenster Sensor Magnetschalter Haus Alarmanlage nx
2,36 €
There are two types of reed switches: "normally open" reed switches and "normally closed" reed switches. A normally-closed reed switch is closed when it is not near a magnet; as a magnet is brought close to it, a normally-closed switch will open.
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