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Door Window NC Contact Security Safety Alarm Magnetic Sensor Reed Switch SALE

Door Window NC Contact Security Safety Alarm Magnetic Sensor Reed Switch

$12.25$12.89
  • Condition: New
  • Ships from: US
  • Seller: toolmaster88 (99.7% positive)
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About this item

Descriptions: Switch Type: NC(normal closed type), the circuit is closed normally, and, that if a magnet not near it, the circuit open. The Reed Switch is an electrical switch operated by an applied magnetic field. It was invented at Bell Telephone Laboratories in 1936 by W. B. . It consists of a pair of contacts on ferrous metal in a hermetically sealed glass envelope. There are two types of reed switches: normally open reed switches and normally closed reed switches. The metal on a normally open switch stay open when there is no magnet near the switch. In the presence of a magnetic field, the contacts of a normally-open reed switch will close. 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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