12V 4-Channel Optocoupler Relay board Module is suitable for switching of higher voltages and perfect for use with microcontrollers including Arduino, ARM, AVR and PIC. The module uses genuine quality relay, normally open interfaces Maximum load: AC 250V/10A, DC 30V/10A. It uses SMD optocoupler isolation, driving ability, stable performance; trigger current 5mA. The power indicator (green) and the relay status indicator (red) are usually indicates the power is available or not and relay is active or inactive. The interface design of human nature, all interfaces are available through a direct connection terminal leads. Features: Suitable for switching of higher voltages and perfect for use with microcontrollers including Arduino, ARM, AVR and PIC. Relays are rated up to 10A and have NO/NC contacts. Each channel has an LED indicator to show the relay is on. Connects directly to a microcontroller LED Indicator for each channel Module can be high or low by a jumper setting trigger Fault-tolerant design, even if the control line is broken, the relay will not operate Specification: Relay Board: 12V 4-Channel Material: Metal Plastic Switching Capacity: 10A Operating Voltage: 12V Maximum Voltage: AC250V / DC30V Length (mm): 72 Width (mm): 55 Height (mm): 19 Weight (gm): 80 Module interface: DC : positive power supply (VCC) DC-: negative power supply (GND) IN1, IN2, IN3, IN4: can be high or low level control relay S1, S2, S3, S4, high or low level Relay outputs: NO1, 2, 3, 4: normally open relay interface COM1, 2, 3,4: Common Interface Relays NC1, 2, 3, 4: normally closed relay interface High and low level triggers options: It is low level trigger when jumper connect to LOW pin It is high level trigger when jumper connect to HIGH pin Application: Supports all MCU control The industrial field PLC control Smart home control Package Includes: 1 x 12V 4-Channel Relay Board Optocoupler Module for Arduino Raspberry Pi ARM