12V 4-Channel Relay Module Board with Optocouplers (High/Low)

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

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:
S1: It is option switch for channel 1 relay.
S2: It is option switch for channel 2 relay.
S3: It is option switch for channel 3 relay.
S4: It is option switch for channel 4 relay.

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