Features 1 The module uses genuine quality relay normally open interfaces maximum load AC 250V 10A DC 30V 10A2 Using SMD OPTOCOUPLER isolation driving ability stable performance trigger current 5mA3 The module voltage is 5V 9V 12 V 24V are available4 The module can be set to high or low triggered by jumper5 Fault tolerant design even if the control line is broken the relay will not operate6 The power indicator green relay status indicator red 7 Interface design humane all interfaces can be connected directly via terminal wiring leads very convenient8 Module size 50mm 40mm 16mm L W H 9 Has four mounting bolts holes hole 3 1mmInterface 1 DC Positive power supply voltage required by the relay there 5V 9V 12V 24V choice 2 DC Negative power connection3 IN1 1 channel signal to trigger the end you can set a high or low level control relay3 IN2 2 channel signal to trigger the end you can set a high or low level control relayOutputs NO1 After a relay normally open interfaces relay before floating shorted pull with COM1COM1 1 relay common interfaceNC1 1 relay normally closed port COM1 relay shorted before and after the pull vacantNO2 2 way normally open relay interface the relay before floating pull back and COM2 shortCOM2 2 Common Interface relayNC2 2 channel normally closed relay interface relay short front and COM2 pull vacant postHigh and low trigger selection S1 as a relay trigger selection of high and lowS2 high an