This is a 5V 4-Channel Relay interface module, for controlling various appliances, and other equipments with large current. It can be controlled directly by microcontroller (Raspberry Pi, Arduino, 8051, AVR, PIC, DSP, ARM, ARM, MSP430) TTL logic.

• 5V 4-Channel Relay interface board, and each one needs 15-20mA driver current.
• Optical isolation on each channel.
• Standard interface that can be controlled directly by microcontroller (Raspberry Pi, Arduino, 8051, AVR, PIC, DSP, ARM, ARM, MSP430) TTL logic.
• Equipped with high-current relay: AC240V 10A / DC28V 10A.
• Indication LEDs for relay output status.
• Equipped with screw holes for easy installation.
• Size: 75mm (Length) * 55mm (Width) * 19.3mm (Height)
• Weight: 61g
• PCB Color: Blue
• There are four fixed screw holes at each corner of the board, easy for install and fix. The diameter of the hole is 3.1mm
• High quality Songle relay is used with single pole double throw, a common terminal, a normally open terminal, and a normally closed terminal
• Optical coupling isolation, good anti-interference.
• Closed at low level with indicator on, released at high level with indicator off
• VCC is system power source, and JD_VCC is relay power source. Ship 5V relay by default. Plug jumper cap to use
• The maximum output of the relay: DC 30V/10A, AC 250V/10A

4ch-relay.pdf