Specifications:

The module uses genuine quality relays with normally open interfaces.
Maximum load: AC 250V/10A, DC 30V/10A.
Utilizes SMD OPTOCOUPLER isolation for driving ability and stable performance, with a trigger current of 5mA.
The module has a 24V working voltage option.
Each relay module can be set to high or low triggered by a jumper.
Fault-tolerant design ensures that even if the control line is broken, the relay will not operate.
Features a power indicator (green) and 4 relay status indicators (red).
Humanized interface design allows all interfaces to be conveniently connected directly via terminal wiring leads.
Module size: 73mm * 50mm * 18.5mm (L * W * H).
The module has four mounting bolt holes with a hole size of 3.1mm, spaced 67mm * 44.5mm apart.

Interface:

DC+: Positive power supply (voltage required by the relay has a 24V option).
DC-: Negative power connection.
IN1-IN4: Each way can be set to high or low to control the corresponding relay based on settings.

Outputs:

12-line interface, directly connectable to all leads for user-friendliness.
NO1 – NO4: Normally open relay interfaces; relay is vacant before the pull and shorted with COM after pulling.
COM1 – COM4: Common Interface Relays.
NC1 – NC4: Normally closed relay interfaces; relay is shorted with COM before pulling and vacant after pulling.
High and Low Trigger Selection:
S1-S4: Used for relay 1 to 4, providing high and low trigger selection.
Com with low short circuit: Triggering the corresponding relay is low.
High end of the short com high trig: Triggering the corresponding relay is high.