KLR 4 Channel Relay Module Isolated / Bidirection Optocoupler High / Low Trigger / Dual Terminals Dual PCB 5/12/24V Power

KLR 4 Channel Relay Module Isolated / Bidirection Optocoupler High / Low Trigger / Dual Terminals Dual PCB 5/12/24V Power

Description:
- The module uses genuine quality relay , normally open interfaces Maximum load : AC 250V/10A, DC 30V/10A;
- Using the industry's top -quality ultra-compact two-way isolation optocouplers, anti-interference ability , stable performance ; trigger current is only 3mA;
- The module voltage is 5V, 12V, 24V are available
- User-selectable relay control level can be high pull, pull can also be low ; module containing limiting resistor can be used directly to control the power of positive and negative , can also use the MCU I / O port control ;
- Fault-tolerant design , even if the control line is broken , the relay will not operate ;
- The power indicator ( red ) , 4 relay status indicator ( blue )
- Interface design humane, all interfaces can be connected directly via terminal wiring leads , very convenient
- Module size : 7.5cm * 5.0m * 1.8cm ( L * W * H )
- With 4 fixing bolt holes for easy installation

Two module interface
- Module control side: a 7 -wire interface , all interfaces are terminal, user terminal
     DC +: negative external DC power supply (with 5V, 12V and 24V modules to choose from )
     DC-: negative external DC power supply
     VREF: optically isolated ground reference control terminal ,
         If a high-level control : This signal should be connected to the negative power of the user control panel
         If using low-level control : This signal should be connected to the positive supply user control panel
     CH1-CH4: relay control interface,
         If VREF negative one : This port high ( relative to VREF) when the corresponding relay
         If VREF positive power supply : When this port is low ( relative to VREF) corresponding relay
- Note : Isolated relay module is designed to adapt to the environment is bad or electromagnetic signals high demand for the occasion , if you want to achieve complete isolation , the user control panel power ( ie connection VERF reference power ) power supply and relay module (DC + / DC-) to be distinguished , if the power of the two , the effect is not completely isolated , then the user can choose a more economical in our standard relay module .
- Relay outputs : a 12- line interface, all interfaces are terminal, user terminal
     NO1 - NO4: normally open relay interfaces , relay before the vacant after the pull shorted with COM
     COM1 - COM4: Common Interface Relays
     NC1 - NC4: normally closed relay interface relay shorted with COM ago , after the pull- vacant