KNACRO DC 5V 1-Channel 30A Relay Module Optocoupler Isolation High/Low Level Trigger

Module control: 4 interfaces, all interfaces have terminals, user-friendly wiring; 1, DC +: External DC power supply negative (5V, 12V and 24V modules available) 2, DC-: external DC power supply negative; 3, VERF: photoelectric isolation control terminal reference ground, this signal should be connected to the user control panel power supply negative; 4, CH1: relay control interface, high level (relative to VERF) corresponding relay pull. Note: the isolated relay module in order to adapt to the electromagnetic environment is relatively poor or relatively high signal requirements of the occasion, if you want to achieve a complete isolation effect, the user control panel power supply (that is connected to the VERF reference power) and the relay module power supply (DC + / DC-) should be separated, if the two power supply shared ground, then the effect is not fully isolated, then the user can use the standard relay module. Relay output: 3 interfaces, all interfaces have terminals; 1, NO: relay normally open interface; 2, COM: relay common interface; 3, NC: relay normally closed interface; Package Included: 1*DC 5V 1-Channel 30A Relay Module