1 2 4 8 channel 5V 12V 24V relay module board shielding, with optocoupler support for Arduino high-level and low-level triggers

One module description:
1. The module adopts genuine and high-quality relays, with a normally open interface. The maximum load is 250V/10A AC and 30V/10A DC;
2. Adopting patch optocoupler isolation, strong driving ability, and stable performance; Trigger current 5mA;
3. The working voltage of the module is 5V12V24V

4. The module can be triggered at high or low levels through jumper settings;
5. Fault tolerant design, even if the control line is broken, 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 and led out through wiring terminals, which is very convenient
8. There are 4 fixed bolt holes with a diameter of 3.1mm

Two module interface:
1. DC+: Connect to the positive pole of the power supply (voltage according to relay requirements)
2. DC -: Connect to the negative pole of the power supply
3. IN: The relay can be controlled to engage at high or low levels
Relay output terminal:
1. NO: Relay normally open interface, suspended before relay suction, short circuited to COM after suction
2. COM: Relay Common Interface
3. NC: Relay normally closed interface, short circuited to COM before relay engagement, suspended after engagement

High and low level trigger selection terminal:

1. When the jumper is short circuited to LOW, it is triggered at a low level;

2. When the jumper is short circuited to high, it is triggered at a high level