4 Channel Relay Module 5V 12V 24V Board Shield With Optocoupler Isolation Support High and Low Level Trigger for Rasp Pi Arduino

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1. Maximum load:AC 250V/10A, DC30V/10A
2. SMD optocoupler isolation, strong driving ability, stable performance; trigger current 5mA
3. The module voltage 5V 12V 24V
4. Each channel module can be set high or low triggered by jumper
5. Fault-tolerant design, even if the control line is broken, the relay will not operate
6. Power indicator (green), 4 relay state indicator (red)
7. Interface design user-friendly, all interfaces are available through the wiring terminal direct connection leads, very convenient

Module Port:
1. DC+: DC power supply positive 
2. DC-:   DC power supply negative 
3. IN1:   Channel 1 signal trigger terminal
4. IN2:   Channel 2 signal trigger terminal
5. IN3:   Channel 3 signal trigger terminal
6. IN4:   Channel 4 signal trigger terminal

Relay Output:
1. NC1:     Channel 1 relay normally closed pin.
2. COM1:  Channel 1 relay common pin.
3. NO1:     Channel 1 relay normally opened pin.
4. NC2:     Channel 2 relay normally closed pin.
5. COM2:  Channel 2 relay common pin.
6. NO2:     Channel 2 relay normally opened pin.
7. NC3:     Channel 2 relay normally closed pin.
8. COM3:  Channel 2 relay common pin.
9. NO3:     Channel 2 relay normally opened pin.
10. NC4:     Channel 2 relay normally closed pin.
11. COM4:  Channel 2 relay common pin.
12. NO4:     Channel 2 relay normally opened pin.

High And Low Level Trigger Option:
1. S1:   It is option switch for channel 1 relay.
2. S2:   It is option switch for channel 2 relay.
3. S3:   It is option switch for channel 3 relay.
4. S4:   It is option switch for channel 4 relay.