4 Channel Relay Module, Board 5V Module with Optocoupler High & Low Trigger for Arduino 5V/12V/24V(5V)

【Fault-tolerant Design】This 4 Channel Relay Module with Fault-tolerant design,even if the control line breaks,the relay will not move. Power indicator light (green), 4-way relay state indicator light (red). 【Stable Performance】The Relay Board adopt patch photocoupler isolation, strong driving ability, stable performance. Trigger current is 5mA. The module can be high or low by a jumper setting trigger.The module uses genuine quality relay, normally open interfaces. 【Humanized Interface Design】This 4 Channel Relay Module with Humanized interface design, all interfaces can be directly connected through the terminal lead, very convenient. Four fixing bolt holes are provided. Standard interface that can be controlled directly by microcontroller (Arduino ,, 8051, AVR, PIC, DSP, ARM, ARM, MSP430, TTL logic); 【More Choice】 Relay module operating voltage is 5V,12V,24V for choice. Each path of the module can be triggered by the high level or low level through a jumper setting. 【after-sales service】We stand behind all of our them with a product guarantee and promise to give you the best in customer care! If you have any issue about the 4 Channel Relay Module, please contact us by e-mail, we will try our best within 24 hours to reply.