KNACRO DC 24V SLA-24VDC-SL-C DC 24V/AC 250V 30A dual relay module 30A two-way 2-way relay module optocoupler isolation

Module control side:5-wire interface, all interfaces have terminals, user-friendly wiring 1, DC +: external DC power supply positive (5V, 12V and 24V modules to choose from) 2, DC-: external DC power supply negative 3, VREF: photoelectric isolation control terminal reference ground, -If high-level control is used: This signal should be connected to the negative terminal of the user's control panel power supply -If low level control is used: This signal should be connected to the positive terminal of the user's control panel power supply CH1: relay control interface, -If VREF is connected to the power supply negative: This port is high (relative to VREF) when the corresponding relay pulls -If VREF is connected to the power supply positive: This port is low (relative to VREF) when the corresponding relay pulls 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:6-wire interface, all interfaces have terminals, user-friendly wiring 1, NO1-NO2: relay normally open interface); 2, COM1-COM2: relay common interface; 3, NC1-NC2: relay normally closed interface ; Package Inluded: 1*DC 5V 2-Channel 30A Relay Module