AiTrip 12V 4 Channel Isolated Optocoupler HighLow Level Trigger with Optical Isolation Relay Switch Module

Feature: Each way module can be set high or low triggered by jumper Materials : Metal, Plastic, Electric Parts Module Size: 73*50*18.5mm With 4 fixed bolt holes, diameter 3.1mm, spacing 44.5*67mm Module interface: 1. DC+: positive power supply (VCC) 2. DC-: negative power supply (GND) 3.IN1-IN4: the corresponding relay can be controlled by high or low level 4.S1-S4: high or low level trigger selection Relay output: 1.NC1-NC4: relay normally close the interface,short-circuited with 2.COM before pulling,and then suspend 3.NO1-NO4: normally closed relay interface 4.COM1--COM4: relay common interface Package Content : 1 x Optocoupler Driver Relay Module