BESTEP 1 Channel Low Level Relay Module with Light Coupling 3V DC

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$ 1.29
Specifications: Two module interface: 1. DC : Connect the power supply positive pole (voltage 3.3V). 2. DC-: Connect the power negative pole. 3. IN: Low level (3.3V) control relay pull in. Relay output terminal: 1. NO: Relay normal open, the relay suspends before pulling in, and then short-connect with the COM. 2. COM: Relay common interface 3. NC: Relay normal close, short connected with COM before pulling in and suspended after pulling in.