describe SMD optocoupler isolation, strong driving ability, stable performance, 5mA trigger current. The module operating voltage is 12V Fault-tolerant design, even if the control line is disconnected, the relay will not act. Each module path can be switched high or low through jumper settings. Power indicator (green), 8-way relay status indicator (red). Specification: Weight: 118g / 4.2oz Common interface load: AC 250V / 10A, DC 30V / 10A Module dimensions (L x W x H): 141.5 x 50 x 18.5mm/5.6 x 2 x 0.7in Bolt Holes: 3.1mm; 136 x 44.5mm (Pitch) Voltage: 12V Module Interface: 1. DC+: Connect to the positive pole of the power supply 2. DC-: Connect to the negative pole of the power supply 3. In1-in8: According to the settings of each channel, the corresponding relay can be controlled to close the high and low levels. Relay output terminal: There are 24 line interfaces, all interfaces can be directly connected to the lead wires, which is convenient for users. 1. NO1-NO8: The relay is normally open interface, the relay is suspended before closing, and it is connected to COM shortly after closing; 2. COM1-COM8: Common relay interface; 3. NC1-NC8: Normally closed relay interface. Insert COM before the relay triggers, and pause after it triggers. High and low level trigger selection terminal: 1. S1-S8 is the selection of high and low continuous triggering of relays 1-8; 2. When com and short circuit are connected, the corresponding relay is triggered by low level, and when com is connected with high short circuit, it is triggered by high level. Packing list: 1x relay module