Relay Module 16 Channel 24V Low Level Trigger Module

Product Description What is this? Widely used for DSP(digital signal processing), MCU(Microcontroller Unit) control, programmable logic controller, smart home control etc. What will I get? Relay module, is in size of: 16 channel, 24V voltage, 10A AC250V/DC30V maximum load current and voltage, 0-4V trigger voltage, 3mA trigger current, 180mm x 90mm/7.09-inch x 3.54-inch(L*W) In the package of: 1pcs x Relay module Is there any advantages of the product? Photo coupler isolation strong driving ability, stable performance; It can be connected directly through the terminal block, which is convenient for connection; Fixing screw hole position for easy installation How to use it? Module interface: 1. VCC: connected to the positive pole of 5V power supply 2. GND: connected to negative pole of 5V power supply 3. In1-In4: signal trigger terminal, active at low level Relay output terminal: 1. NO1--NO4: normally open interface of relay, the relay is suspended before closing, and is short circuited with COM after closing 2. COM1--COM4: common interface of relay 3. NC1--NC4: normally closed interface of relay. The relay is short circuited with COM before closing and suspended after closing What should I notice? Please pay attention to selecting the appropriate relay module, especially the voltage and current