4-Channel 12V Relay Module with Optocoupler H/L Level Triger for Arduino, 501 Original

Module description: 1. Maximum load onnormally open pin: AC 250V/10A, DC 30V/10A. 2. Trigger current5mA; 3. Module can be sethigh level or low level trigger by jumper wire; 4. Power indicatorlight (green), relay status indicator light (red); 5. Module size:Approx. 73mm * 50mm* 18.5mm. Module interface specifications: 1. DC+ : DC powersupply positive pole 2. DC- : DC powersupply negative pole 3. IN1~IN4 : relaysignal triggering pin Relay output: 1. Normally closedpin (NC1~NC4) : relay normally closedpin 2. Common pin(COM1~COM4) : relay common pin 3. Normally openedpin (NO1~NO4) : relay normally openedpin High or low level trigger option: 1. S1~S4:They areoption switch for relay 1~4;3. It is low level triger if COM pin connect to LOWpin; It is high level triger if COM connect to High.Package Content:1 x Relay Module