AEDIKO 8 Channel Relay Module DC 5V Relay Board with OPTO Isolated Support High or Low Level Trigger auspowers_batchthree 90 Degree Unpolished Weld Elbow Color:Black 4 Pack 90 Degree Unpolished Weld Elbow energy efficiency and environmental The Relay Is Suspended Before The Suction and It Is Short Circuited With COM After The SuctionCOM1 COM8: Common Interfaces of the 8 Channel RelayNC1 NC8: Normally Closed Interface of Relay and It is Shorted to COM Interface Before The Suction is Closed High and Low Trigger Selection: S1 S8 are the High and Low Level Trigger Selections of Relay 1 to 8 in SequenceCOM is Shorted With Low It is Triggered by High Level Read more Package Contents: 1x DC 5V Relay Module 8 Channel with Optocoupler Support High Low Level Trigger DC 24V Relay Module 8 Channel DC 12V Relay Module 8 Channel 2pcs DC 12V Relay Module 4 Channel 4pcs DC 12V Relay Module 2 Channel 4pcs DC 5V Relay Module 1 Channel 4pcs DC 12V Relay Module 1 Channel Voltage DC 24V DC 12V DC 12V DC 12V DC 5V DC 12V Channel 8 8 4 2 1 1