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Amazon.com: 2X Magnetic Reed Switch Normally Open Closed NC NO Door Alarm Window Security/Magnetic Door Switch/Magnetic Contact Switch/Reed Switch, DC 5Vto12V Light (Black) : Industrial & Scientific
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Electronics-Salon DIN Rail Mount 8 SPDT Power Relay Interface Module. (Operating Voltage: DC 12V): Amazon.com: Industrial & Scientific
Eaton ESR5-NO-31-24VAC-DC Safety Relay, Single Dual Channel Main Unit, 3 NO Safety Output, 1 NC Signal Output, 24 VAC/DC Control Voltage: Electronic Relays: Amazon.com: Industrial & Scientific
