A module description: 1. The module adopts relay, normally open interface with 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 to choose from; 4. The module can be triggered by jumper setting high level or low level; 5. Fault-tolerant design, even if the control line is broken, the relay will not act; 6. Power indicator (green), relay status indicator (red) 7. The interface design is user-friendly, and all interfaces can be directly connected through the terminal block, which is very convenient 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: high or low level control relay pull-in 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 normally closed interface, the relay is short-circuited with COM before it is pulled in, and it is left in the air after it is pulled in. 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 triggered by high level. Delivery Quantity: 5pcs, Size: 50mm * 26mm* 18.5mm (L*W*H), there are 4 fixing bolt holes, the holes are 3.1mm, and the spacing is 44.5mm*20.5mm color: blue Kind tips 1. Package content: only the above package content, excluding other products. 2. The size is measured manually, please allow 1-2 cm measurement error 3. Due to different displays and lighting effects, the actual color of the item may be slightly different from the color shown on the picture.