4-channel relay module 5V/12V/24V, optocoupler relay module board with high and low trigger for Arduino (5V)

Fault-Tolerant Design: This 4-channel relay module features a fault-tolerant design; even if the control line is broken, the relay will not be activated. It includes a power indicator (green) and a 4-position relay status indicator (red).

Humanized Interface Design: This 4-channel relay module's user-friendly interface allows for direct connection of all interfaces via the terminal cable, which is very convenient. Four mounting holes are provided. It features a standard interface that can be directly controlled by a microcontroller (Arduino, Raspberry Pi, 8051, AVR, PIC, DSP, ARM, MSP430, TTL logic).

Stable Performance: The relay board uses optocoupler isolation, providing strong driving capability and stable performance. The triggering current is 5 mA.

The module can be set high or low using a jumper trigger. The module uses a genuine, high-quality relay with normally open interfaces. The operating voltage of the relay module is 5V, 12V, or 24V. Each channel of the module can be set high or low via a jumper. Each channel of the module can be triggered from the top or bottom via a jumper.

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Features: Adopts separate optocoupler isolation, strong driving capability, stable performance. The triggering current is 5mA. The operating voltage of the module is 5V, 12V, 24V.

Each channel of the module can be triggered from the top or bottom via a jumper.

Specification: Weight: 60g / 2.1oz Common interface load: AC 250V / 10A, DC 30V / 10A Module size (L * W * H): 73 * 50 * 18.5mm / 2.9 * 2 * 0.7inch Bolt hole: 3.1mm; 67 * 44.5mm (spacing) Voltage: 5V, 12V, 24V (optional)

Module interface: 1. DC+: Connect to the positive terminal of the power supply (a voltage is required for the relay; 5V, 12V, and 24V are available) 2. DC-: Connect to the negative terminal of the power supply. 3. IN1-IN4: Depending on the setting of each circuit, the corresponding relay can be controlled with an up or down position to activate.

Relay Output Terminal: With 12 interface lines, all interfaces can be directly connected to the cable, convenient for users. 1. NO1 - NO4: The relay normally opens the interface and is suspended before being activated and is connected to COM after activation. 2. Common interface of the relay COM1 - COM4. 3. NC1 - NC4: Normally closed relay interface. The relay is briefly connected to COM before being activated and suspended once activated.

High and Low Trigger Selection Terminal: 1. S1-S4 is the high-low trigger selection of relay 1-4 channels successively; 2. Connect COM and short-short wires; the corresponding relay controls the down trigger; connect COM and high-short wires to the up trigger. Package list: 1 x 4-channel relay module