DC 12V 24V 8 Isolated Input & 8 Output DIN35 C45 Rail Box UART RS485 Relay Module Modbus RTU Control Switch Board
5106+ sold
$20.84$59.56
65% OFFBuy on AliExpress
You will be redirected to AliExpress to complete your purchase
Specifications
- Brand Name
- eletechsup
- Origin
- Mainland China
- High-concerned chemical
- None
- Condition
- New
- Type
- Relay
- Supply Voltage
- 12V
- is_customized
- Yes
- Choice
- yes
Product Description
Product Name: DC 12V 24V 8 Isolated Input & 8 Output DIN35 C45 Rail Box UART RS485 Relay Module Modbus RTU Control Switch Board
Package inlcuded:
1PCS DC 12V/24V 8 Input & 8 Output RS485 Relay Module
Description:
1: DC 12V (12V Version), DC 24V (24V Version)
2: Standby current (all relays closed) 13MA, 1 relay open 41MA, 2 relays open 69MA, 3 relays open 95MA,4 relays open 122MA,5 relays open 149MA,6 relays open 174MA, 7 relays open 198MA,8 relays open 225MA
3 8 photoelectric isolation Input ports (NPN low level active ), the input and output relationship can be set to associated (default) and non-associated through commands.
4: ''open'' ''close'' ''Momentary'' ''Self-locking'' ''Interlock'' ''Delay'' 6 Commands
5: MODBUS RTU command, Support 03 06 16 function code
6: Under the ''Delay'' command ,the maximum delay is 255 seconds;
7 MODBUS commands can be made serial HyperTerminal (serial assistant) OR ''Modbus Poll'' Enter;
8 Under the MODBUS command mode, it can support up to 64 devices in parallel
9 The default baud rate is 9600BPS. The baud rate can be selected through jumpers: 2400 4800 9600 19200BPS
10 Size: 136 * 72 * 20mm(Only PCB Board);140 * 88* 42mm(with Din Rail Box)
11 Weight: 134g(Only PCB Board);223g(with Din Rail Box)
12 Maximum load: 10A / 250VAC, 10A / 125VAC, 10A / 30VDC, 10A / 28VDC, 10A / 12VDC
2: Standby current (all relays closed) 13MA, 1 relay open 41MA, 2 relays open 69MA, 3 relays open 95MA,4 relays open 122MA,5 relays open 149MA,6 relays open 174MA, 7 relays open 198MA,8 relays open 225MA
3 8 photoelectric isolation Input ports (NPN low level active ), the input and output relationship can be set to associated (default) and non-associated through commands.
4: ''open'' ''close'' ''Momentary'' ''Self-locking'' ''Interlock'' ''Delay'' 6 Commands
5: MODBUS RTU command, Support 03 06 16 function code
6: Under the ''Delay'' command ,the maximum delay is 255 seconds;
7 MODBUS commands can be made serial HyperTerminal (serial assistant) OR ''Modbus Poll'' Enter;
8 Under the MODBUS command mode, it can support up to 64 devices in parallel
9 The default baud rate is 9600BPS. The baud rate can be selected through jumpers: 2400 4800 9600 19200BPS
10 Size: 136 * 72 * 20mm(Only PCB Board);140 * 88* 42mm(with Din Rail Box)
11 Weight: 134g(Only PCB Board);223g(with Din Rail Box)
12 Maximum load: 10A / 250VAC, 10A / 125VAC, 10A / 30VDC, 10A / 28VDC, 10A / 12VDC
For more information, please Download instruction manual link:
DIN rail Box parameters:
Product model: UM72
Color: green
Width: suitable for PCB board width UM72(72mm)
Insulation grade: flame-retardant VO grade
Backplane length: suitable for 136 mm PCB boards
Net weight: 99g
Installation: DIN35 and C45 rail
Application
PLC IO expansion board
Smart Home,Home Automation ,Wiser Home;
Smart Home,Home Automation ,Wiser Home;
PTZ CCTV Camera
Security Monitoring
Identification system;
Motor FW & BW
Automatic curtain control
Automatic curtain control
Typical applications:
1 The dial switch (slave address) is invalid and can only control one module at a time.
1 The dial switch (slave address) is invalid and can only control one module at a time.
MODBUS RTU command mode (HEX), you can control a variety of ways: Serial Hyper Terminal Control (need to manually add the CRC), Modbus Poll software control (software automatically add the CRC), PLC or MCU process control
Wiring Diagram:
1 DC 12V/24 control circuit,Wiring diagram below. ''LOAD'' may be camera,LED lights, fans, motors and other DC 12V/24V equipment
2 DC 1-110V OR AC 85-265V control circuit,Wiring diagram below(Note:If not DC 12V/24V load, need another DC 12V/24V power supply). ''LOAD'' may be LED lights, fans, motors Lights, fluorescent lights, solar water heaters and other DC AC equipmen
Test Software(We offer a demo video):
Serial HyperTerminal:
Modbus Poll
Pros & Cons
Pros
- 8 isolated inputs and 8 outputs for robust industrial control.
- Modbus RTU over RS485 for reliable long-distance communication.
- DIN35 rail mount for easy panel installation.
- Dual voltage support 12V/24V with low standby current.
Cons
- Limited specs on relay ratings like contact current/voltage.
- No detailed input isolation voltage specified.
- Unbranded from China, potential firmware compatibility issues.
- Shipping from Mainland China may delay delivery.
Common Questions
What voltage options are available for the 8-in/8-out RS485 relay module?
Supports DC 12V or 24V versions.
What communication protocol does the relay module use?
UART RS485 with Modbus RTU for control.
Is the relay module designed for DIN rail mounting?
Yes, DIN35 C45 rail box installation.
What is the standby current for the relay board?
Standby current with all relays closed is 13mA.
Where is the DC 12V/24V relay module shipped from?
Mainland China, includes 1PCS per package, new condition.
Product information last updated on April 26, 2026