Module 1. The module adopts a genuine quality relay, with a maximum load of the normally open interface: AC 250V/10A, DC 30V/10A. 2. Features double optocoupler isolation, strong drive capability, and stable performance; trigger current is 5mA. 3. Each channel of the module can be triggered by jumper selecting high or low level. 4. Fault-tolerant design ensures the relay remains inactive even if the control line is disconnected. 5. Includes a power indicator (green) and one relay status indicator (red). 6. User-friendly interface design allows all connections to be made directly via terminal blocks for easy wiring. Module interface: 1. DC+: Connect to the positive terminal of the power supply (voltage is 5V DC). 2. DC-: Connect to the negative terminal of the power supply. 3. IN: Relay can be controlled by high or low level signal. Relay output: 1. NO: Normally open contact; open when relay is off, connects to COM when relay is activated. 2. COM: Common terminal for relay. 3. NC: Normally closed contact; connected to COM when relay is off, disconnects when relay is activated. High and low level trigger selection: 1. S1 is the trigger level selection for relay 1. 2. When COM is shorted to LOW, the corresponding relay is set to low-level trigger; when COM is shorted to HIGH, it is set to high-level trigger. Note: 1. Due to differences in monitors and lighting effects, the actual color of the item may vary slightly from the images shown. 2. Please allow a measuring deviation of 1 cm to 3 cm due to manual measurement.