A description of the module: 1. The module adopts a relay, a normally open interface with a large load: AC 250V/10A, DC 30V/10A; 2. Using patch optocoupler isolation, strong driving ability and stable performance, trigger current 5mA; 3. The working voltage of the module is 5V, 12V, 24V for you to choose; 4. The module can be triggered by high or low level jumper setting; 5. Fault-tolerant design, even if the control line is interrupted, the relay will not act; 6. Power indicator light (green), relay status indicator light (red) 7. The interface design is user-friendly, and all interfaces can be directly connected through the terminal block, which is very convenient. 8. Module size: 50mm * 26mm * 18.5mm (length * width * height) 9. There are 4 fixing bolt holes, the holes are 3.1mm, and the spacing is 44.5mm * 20.5mm Two module interface: 1. DC+: Connect to the positive power supply (voltage according to the relay requirements, there are 5V, 12V and 24V options) 2. DC-: Connect to the negative power supply 3. IN: Pull-in of high or low level control relay Relay output: 1. NO: The relay is normally open, the relay is suspended before it is closed, and it is short-circuited with COM after it is closed. 2. COM: Relay common interface 3. NC: The relay is a normally closed interface, the relay is short-circuited with COM before it is inserted, and it is left in the air after it is inserted. High and low level trigger selection terminal: 1. When the jumper is short-circuited with LOW, it is a low-level trigger; 2. When the jumper is short-circuited with HIGH, it is a high-level trigger. 3. Technical Parameters: Relay version: 5v Quiescent current: 5mA High current: 190mA Trigger current: 2-4mA Trigger voltage (low): 0-1.5V Trigger voltage (high): 2.5-5V Package included: 5 x 5V one-way relay module