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This 6 Channel Relay Module (with light coupling) 5V module meets the safety standard as control areas and load areas have the isolation groove. Optical coupling isolation module. The triggering of the 6 Channel Relay Board is reliable, more stable. The double FR–4 circuit board design, high-end SMT process. Arduino 6 Channel Relay Module has power and relay operation instructions. Relays terminals (C, NC, NO) are accessible through screw terminals which makes wiring up the board very easy. The inputs of the 6 Channel Optocoupler Relay Module are isolated to protect any delicate control circuitry. A wide range of microcontrollers such as Arduino, AVR, PIC, ARM, and so on can control it. The use of such a high-voltage relay eliminates the risk of heating up the relay as an electromechanical relay limits the current consumption in accordance with a voltage rating.