{"product_id":"door-window-normal-closed-contact-security-safety-alarm-magnetic-sensor-reed-swi","title":"Door Window Normal Closed Contact Security Safety Alarm Magnetic Sensor Reed Switch Sets","description":"\u003cdiv class=\"product-description\"\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eCountry of Manufacture CHINA; Material Plastic, Electronic Parts; Net Weight 23g\u003c\/li\u003e\n\u003cli\u003ePackage Content 1 x Magnetic Door Switch Sets, Installation Screws; Type \/; Rated Voltage DC 100V\u003c\/li\u003e\n\u003cli\u003eRated Current 500mA; Rated Power \/; Wire Length \/\u003c\/li\u003e\n\u003cli\u003eMain Color White; Contact Type NC(normal closed type); Operating Distance 17mm-25mm\u003c\/li\u003e\n\u003cli\u003eBig One Size(Approx) 64 x 20 x 13mm \/ 2.5\" x 0.8\" x 0.51\"(L*W*H); Small One Size(Approx) 64 x 13 x 13mm \/ 2.5\" x 0.5\" x 0.51\" (L*W*H)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eProduct Description\u003c\/h2\u003e\n\u003cp\u003eSwitch 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. Ellwood. It consists of a pair of contacts on ferrous metal reeds in a hermetically sealed glass envelope. There are two types of reed switches: normally open reed switches and normally closed reed switches. The metal reeds 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.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"LinkMejor","offers":[{"title":"Default","offer_id":55039281365364,"sku":"B077GLDM1G","price":9.19,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1007\/5799\/5892\/files\/51xwnMqjrtL._AC_SL1100.jpg?v=1785250439","url":"https:\/\/linkmejor.com\/products\/door-window-normal-closed-contact-security-safety-alarm-magnetic-sensor-reed-swi","provider":"linkmejor.com - More for Less","version":"1.0","type":"link"}