Description : - This module conform international safety standard, the isolation groove between control areas and load area - With optical coupling isolation, triggering more reliable, more stable - The double FR-4 circuit board design - Have power and relay operation instructions.The LED will be lit when relay on - Signal input with a low level signal, the common pin - Relay can directly control all kinds of equipment and load - One normally open pin and a normally closed pin - Blue KF301 terminal, more convenient - Module size : 53x18x18.5mm MODULE INTERFACE Input part : VCC : Connect to power positive (according to the relay voltage range) GND : Connect to power negative IN : Relay module trigger pin (low level trigger) Output part : Normally Opened (NO) : Normally open pin of relay. NO pin is not connect to COM pin when relay off. NO pin is connect to COM pin when relay on Common pin (COM) : Common pin of the relay Normally closed (NC) : Normally close pin of relay. NC pin is connect to COM pin when relay off. NC pin is not connect to COM pin when relay on Electrical parameters : - Voltage version : 12V - The static current : 4mA - Working current : 65mA - Trigger voltage : 10-12V - Trigger current : 2mA #relay #arduino #led #interface #board