This is the 5V variant of the 5V Modbus RTU 4 Channels Relay Module, Input Optocoupler, Isolation RS485 MCU for, Arduino in Relay Modules. Available at ₹590.00 (₹500.00 + GST) with free shipping across India.
5V Modbus RTU 4 Channels Relay Module, Input Optocoupler, Isolation RS485 MCU for, Arduino
This board features four 5V relays designed to switch high-current devices such as appliances and machinery. It is directly controllable by various microcontrollers, including Arduino, 8051, AVR, PIC, DSP, ARM, MSP430, and TTL logic. Each relay necessitates a driving current of 50-60mA and is capable of handling loads up to AC250V 10A or DC30V 10A.
Application:
- Supports all MCU control.
- The industrial field.
- PLC control.
- Smart home control.
Features:
- .Modbus serial communication
- Relay switching output
- Convenient AT command control
Specification:
| Product Name | 4 Bit ModbusRTU Relay Module |
|---|---|
| Working Voltage | DC 5V |
| Working Current | 1A |
| Working Temperature Range (°C) | -25℃~85℃ |
| Working Humidity Range | 5%~95%RH |
| Size(mm) | 78*78*20mm |
| Shipping Weight | 0.08 kg |
| Shipping Dimensions | 11 × 10 × 2 cm |
Package Includes:
1 x 5V Modbus RTU 4, Channels Relay Module
5V Modbus RTU 4 Channels Relay Module, Input Optocoupler, Overview
This 4-channel relay board combines Modbus RTU serial communication over RS485 with optocoupler-isolated inputs to switch high-current devices. Designed for direct integration with Arduino, ARM, PIC and other TTL-level MCUs, it enables reliable control of appliances, industrial machinery and smart-home fixtures.
Key Features of 5V Modbus RTU 4 Channels Relay Module, Input Optocoupler,
- Four independent 5V relays, each handling AC250V/10A or DC30V/10A loads
- Input isolation via optocouplers for protection against noise and voltage spikes
- RS485 interface supporting Modbus RTU and simple AT-style command set
- Compatible with Arduino, 8051, AVR, PIC, DSP, ARM, MSP430 and other TTL MCUs
- Compact footprint (78×78×20 mm) with 1 A supply current at 5 VDC
- Genuine product, fast shipping from Zbotic
Applications and Use Cases
- Industrial automation: Start/stop motors, pumps or conveyors via Modbus RTU
- Smart home control: Remote switching of lights, fans and HVAC units
- Building management: Integrate with BMS or PLC networks over RS485
- Agricultural systems: Automated irrigation valves and greenhouse equipment
- Lab equipment: Timed or condition-based activation of heaters and stirrers
How to Use 5V Modbus RTU 4 Channels Relay Module, Input Optocoupler,
To set up, connect a regulated 5 V supply (1 A) to VCC/GND, wire the RS485 A/B lines to your MCU’s transceiver, then address the module via its Modbus ID. Use a standard Modbus RTU library or AT commands to switch individual relays. Attach loads to the COM/NO or COM/NC terminals, ensuring proper grounding and observing the 10 A current rating.
Why Buy from Zbotic?
- Genuine Products: All items sourced from authorized distributors
- Fast Shipping: Orders ship within 24 hours with tracking (non backordered products)
- Free Shipping: Free delivery on qualifying orders
- COD Available: Cash on Delivery, UPI, cards, net banking
- Technical Support: Expert help for setup and troubleshooting
- Easy Returns: Hassle-free replacement for defective products
Frequently Asked Questions
Can I control this relay module with Arduino over RS485?
Yes. Use a MAX485 or similar transceiver to connect the module’s A/B lines to Arduino, then employ a Modbus RTU library or AT commands to switch relays programmatically.
What is the switching capacity of each relay?
Each relay contact supports up to AC250 V at 10 A or DC30 V at 10 A, suitable for most household and light industrial loads.
Does this module require external driver transistors for the relays?
No. The board includes onboard drivers and optocoupler isolation, so you only need to provide 5 V power and RS485 signals—no extra transistor circuitry is required.
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Read More →Technical Specifications
| Brand | Arduino |
|---|---|
| Operating Voltage | 5V |
| Interface / Protocol | RS485 |
| SKU | AI3323 |
| Weight | 0.1079 kg |
| Availability | Out of Stock |
Applications & Use Cases
The 5V Modbus RTU 4 Channels Relay Module, Input Optocoupler, Isolation RS485 MCU for, Arduino is a versatile relay modules used across a wide range of applications including home automation, industrial control, IoT projects, Arduino/Raspberry Pi interfacing, and motor control.
Common use cases:
- Switching high-voltage AC appliances with a microcontroller
- Building a smart home relay board
- Automating irrigation pumps in agriculture
This product is ideal for electronics engineers, IoT developers, and automation hobbyists.
Technical Tip: Use optocoupler-isolated relay modules to protect your microcontroller. Match relay coil voltage to your MCU logic level (3.3V or 5V).
Shipping & Delivery
- Free shipping on orders above ₹999 across India
- Dispatched within 1-3 business days
- Expected delivery: 3-7 business days depending on location
- Secure packaging to ensure safe transit of electronic components
- Genuine Arduino product sourced from authorized channels
