Home Waveshare ESP32‑S3 WiFi/BLE Relay 6CH | RS485 | DIN‑Rail, Isolated

Waveshare ESP32‑S3 WiFi/BLE Relay 6CH | RS485 | DIN‑Rail, Isolated

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SKU: Waveshare-26756
Sale price 27,85 €
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Guarantee & Return Policy

Effective Date: December 10, 2025

At OpenELAB, we are committed to providing accurate product descriptions and high-quality electronics. The following policy outlines your rights and obligations, designed to be fair to both our customers and our business operations globally.

1. Warranty Policy

A. Standard Limited Warranty (Global & US)

For customers in the United States, Asia, and other non-EU regions:

  • Warranty Period: OpenELAB provides a 12-month warranty from the date of delivery.

  • Coverage: This warranty covers defects in material and workmanship under normal use.

  • Resolution: We will repair or replace defective units at no charge.

B. Statutory Rights for EU/UK Customers (EU Compliance)

If you are a consumer residing in the European Union or the UK purchasing from our global site:

  • Statutory Guarantee: You are entitled to a 24-month statutory guarantee for conformity defects present at the time of delivery, in accordance with EU consumer protection laws.

  • Relation: The Standard Limited Warranty (Section 1.A) applies in addition to, and does not replace, your statutory rights.

C. Warranty Exclusions (Applies to ALL Regions)

Warranty coverage is VOID if the damage is caused by:

  1. Misuse: Incorrect installation, reverse polarity, or exceeding voltage limits.

  2. Unauthorized Modification: This explicitly includes soldering, cutting pins, modifying the PCB, or flashing unauthorized/beta firmware that "bricks" the device.

  3. Physical Damage: Drops, moisture/water damage, or electrical surges (lightning).

  4. Normal Wear & Tear: Consumable parts (e.g., batteries), unless defective upon arrival.

Note: For non-warranty repairs (e.g., customer-induced damage), we may offer repair services for a fee. Shipping and diagnostic costs will be borne by the customer.

2. Return & Refund Policy

A. Return Window

  • Standard: You may request a return within 31 days of receiving your order.

B. Refund Conditions & Restocking Fees

To protect against policy abuse, the refund amount is strictly determined by the condition of the returned item.

1. Full Refund (100%)

  • The item is Brand New, Unopened, and Unused.

  • The original packaging is intact and sealed.

  • All accessories are present.

2. Partial Refund (Restocking Fee / Value Depreciation)
If the item is returned in a condition that prevents it from being sold as new, OpenELAB reserves the right to deduct a Restocking Fee (for US/Global) or Compensation for Loss of Value (for EU) from the refund amount.
Deductions apply if:

  • Signs of Use: Visible scratches, mounting marks on screw holes, or fingerprints.

  • Damaged Packaging: Original box is torn, written on, or missing.

  • Technical Modification: The device has been soldered, permanently installed, or flashed with unauthorized firmware.

  • Broken Seals: Anti-static bags or security seals have been opened.

Depending on the severity of the usage/damage, the deduction may range from 15% to 50% of the product price. Items damaged beyond repair due to misuse will not be refunded.

C. Shipping Costs

  • Defective / Wrong Item: OpenELAB covers the return shipping cost.

  • Customer Remorse (Changed Mind / Ordered Wrong Item): The customer is responsible for all return shipping costs to our designated return center (located in the US, Germany, or China, depending on your region). Original shipping fees are non-refundable unless required by local law.

3. Return Process (RMA)

To ensure a smooth return process, please follow these steps:

  1. Authorization: Contact us at info@openelab.io before returning any item. Returns without prior authorization will not be accepted.

  2. RMA Number: We will provide you with a Return Merchandise Authorization (RMA) number and the correct return address.

  3. Packing: Ship the item back in its original packaging with the RMA number clearly marked on the shipping label (not on the product box).

  4. Tracking: We strongly recommend using a trackable shipping method. OpenELAB is not responsible for returns lost in transit.
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Waveshare ESP32‑S3 WiFi/BLE Relay 6CH | RS485 | DIN‑Rail, Isolated

Waveshare ESP32‑S3 WiFi/BLE Relay 6CH | RS485 | DIN‑Rail, Isolated

27,85 €

Waveshare ESP32‑S3 Relay 6CH is an industrial‑grade relay control board designed for IoT, automation, and smart home applications. Powered by the ESP32‑S3 dual‑core processor, it supports Wi‑Fi, Bluetooth LE, and an onboard isolated RS485 interface for reliable communication with Modbus devices. The board integrates six high‑quality relays (≤10A 250VAC / 30VDC) with optocoupler and digital isolation, ensuring safe and stable operation even in demanding environments. A 40‑pin Pico HAT compatible header allows expansion with modules such as RTC, CAN, RS232, or LoRa, while the rail‑mounted ABS case provides secure installation. With wide voltage input (7–36V), USB Type‑C for programming, and built‑in indicators, this module offers a flexible and dependable solution for industrial and AIoT projects.


Key Features

  • High‑Performance MCU — ESP32‑S3, Xtensa® 32‑bit LX7 dual‑core @ 240 MHz with AI computing capabilities and encryption.

  • Wireless & Wired Connectivity — Integrated 2.4 GHz Wi‑Fi + Bluetooth 5 LE; onboard isolated RS485 port.

  • 6 Quality Relays — Contact rating ≤ 10 A 250 VAC / 30 V DC; direct control of high‑voltage appliances or DC loads.

  • Industrial‑Grade Isolation — Power isolation, optocoupler isolation, and digital signal isolation for enhanced safety.

  • Pico HAT Expansion — 40‑pin header compatible with Raspberry Pi Pico HATs (add RTC, CAN, RS232, LoRa, sensors, etc.).

  • Robust Protection — TVS diodes, surge suppression, ESD protection, and onboard matching resistor (enable via jumper).

  • User Indicators — RGB LED, power indicator, RS485 TX/RX LEDs, and onboard buzzer for status feedback.

  • Flexible Power Input — USB‑C or 7–36 V DC via screw terminal; onboard isolated power output for RS485 devices.

  • Compact DIN‑Rail Enclosure — ABS case for safe, easy installation.

 

Specifications

Microcontroller ESP32-S3 (Default module: ESP32-S3-WROOM-1U-N16, customizable for other modules)
Wireless communicatoin 2.4GHz WiFi (802.11 b/g/n)、Bluetooth 5, BLE
USB Connector USB Type-C
Power supply 5V
Functions Power supply, USB communication, firmware downloading, etc.
ISOLATED RS485 Connector Screw terminal
Direction control Hardware automatic control
Protection TVS diode, surge protection & ESD protection
Resistor Onboard reserved 120R matching resistor, NC by default, enabled via jumper
Expanded interface Onboard 40PIN header compatible with some Raspberry Pi Pico HAT, easy to expand other functions such as RTC / CAN / RS232 / LoRa / sensor, etc
Relay Contact rating ≤10A 250VAC/30VDC
Relay channels 6
Contact form 1NO 1NC
Isolation Optocoupler isolation
LED indicators RGB RGB colorful LED, supports programmable control for display color
PWR Red power indicator, lights up when there is USB connection and voltage is detected
TXD Green TX indicator, lights up when the RS485 port sends data
RXD Blue RX indicator, lights up when the device port sends data back
power supply Screw terminal Voltage range 7~36V
Appearance Enclosure Rail-mount ABS protective case
Dimensions 145 × 90 × 40mm

 

Part List

  • ESP32-S3-Relay-6CH x1
  • 2.4G 4DB SMA antenna x1
  • Screwdriver x1

 

Onboard multiple isolation protection circuit

Multiple protections, more safe and reliable

 

High quality 6-Ch relays, supports RS485 and Bluetooth / WIFi remote control

Contact rating of the onboard relay up to 10A 250VAC/30VDC
Directly controlling 220VAC home appliances, or devices below 30VDC

 

Onboard Pico HAT compatible interface and RS485 interface for easy expansion

Onboard isolated RS485 interface, for connecting to various RS485 Modbus industrial modules or sensors. Onboard 40PIN header compatible with some Raspberry Pi Pico HAT, for expanding more functions such as RTC / CAN / RS232 / LoRa / sensor, etc.

 

Supports Arduino, Micropython development

Comprehensive SDK, Dev Resources, And Tutorials To Help You Easily Get Started

 

Applications

  • Industrial equipment control and monitoring

  • Home and building automation

  • Remote IoT relay switching via Wi‑Fi / Bluetooth / RS485

  • Sensor‑triggered relay control with full electrical isolation

  • Integration with Arduino, MicroPython, ESPHome, Home Assistant, and custom firmware


Support Batch Customization

Support software and hardware customization
Including hardware interface, LOGO, label, case and web page, etc.

 

What's On Board

  1. ESP32-S3
    up to 240MHz operating frequency, with 2.4GHz WiFi and BLE
  2. 6-channel quality relays
    contact rating per channel: ≤10A 250V AC or ≤10A 30V DC
  3. Optocoupler isolation
    prevents interference from external high-voltage circuit connected to the relay
  4. Digital isolation
    prevents interference from external signal
  5. Power supply isolation
    provides stable isolated voltage, needs no extra power supply for the isolated terminal
  6. TVS diode
    effectively suppresses surge voltage and transient spike voltage in the circuit
  7. Ceramic gas discharge tube
  8. Relay screw terminals
    for connecting with user devices
  9. 40PIN Raspberry Pi Pico HAT header
  10. RS485 bus interface
    for connecting to external RS485 devices
  1. Power supply screw terminal
    Supports DC 7~36V wide voltage input
  2. LED indicators
    PWR: power indicator
    RXD: RS485 RX indicator
    TXD: RS485 TX indicator
  3. WS2812 RGB LED
    controllable via GPIO38
  4. USB Type-C connector
    for module power supply, firmware downloading and USB communication
  5. Passive buzzer
    sound frequency is controllable via GPIO21
  6. ESP32 RESET button
  7. ESP32 BOOT button
  8. External antenna connector
    SMA female connector, for WiFi and Bluetooth wireless communication
  9. RS485 matching resistor jumper
    Onboard reserved 120R matching resistor, enabled via jumper
  10. Relays default control pin setting

 

Enclosure Design

ABS Protection Enclosure With Rail-Mount Support, Easy To Install, Safe To Use

 

Size

1. General Shipping Information

  • We provide reliable shipping services with a tracking number for each order.
  • Shipping addresses must be entered in English and should not contain special symbols, so that the courier system can recognize your location correctly.
  • Please make sure your shipping address is accurate before placing your order. We ship strictly according to the address provided at checkout.
  • In-stock orders are usually dispatched within 1 business day after order confirmation.
  • Estimated delivery times refer to the period after dispatch and do not include order processing time, weekends, public holidays, customs inspection, or force majeure delays.
  • If you need to cancel or modify your order, please contact us before the order is marked as “Shipped”. Once shipped, the order cannot be canceled or changed.

🚀 Need Faster Shipping?

If you require expedited shipping, please contact our customer support team at info@openelab.io for a customized quote based on your destination.

2. Shipping Rates & Options

Shipping rates are calculated based on order value, destination, and available shipping methods. The final available options will be displayed at checkout.

2.1 Germany Domestic Shipping

Shipping Method Order Value Cost Est. Delivery
Deutsche Post €0.00 - €50.00 €4.95 2-4 Business Days
Deutsche Post Over €50.00 Free 2-4 Business Days
DHL Paket
(Faster Delivery)		 €0.00 - €50.00 €6.95 1-3 Business Days
DHL Paket
(Faster Delivery)		 €50.00 - €100.00 €2.00 1-3 Business Days
DHL Paket
(Faster Delivery)		 Over €100.00 Free 1-3 Business Days

2.2 Selected EU Countries / Regions

Available EU shipping destinations are shown at checkout based on your shipping address. For orders shipped to selected EU countries or regions outside Germany, we use FedEx Regional Economy.

Shipping Method Order Value Cost Est. Delivery
FedEx Regional Economy €0.00 - €100.00 €7.95 3-5 Business Days
FedEx Regional Economy Over €100.00 Free 3-5 Business Days

EU orders may be fulfilled from our Munich warehouse or, when applicable, from our Shenzhen warehouse depending on inventory availability. For EU member states, OpenELAB covers applicable import duties and taxes under DDP service where required.

2.3 United States

Region Shipping Method Order Value Cost Est. Delivery
Continental U.S.
(50 States)		 USPS Ground Advantage €0.00 - €45.00 €4.95 3-7 Business Days
USPS Ground Advantage Over €45.00 Free 3-7 Business Days
USPS Priority Mail €0.00 - €45.00 €16.95 1-4 Business Days
USPS Priority Mail Over €45.00 €14.95 1-4 Business Days
Non-Continental U.S.
(AK, HI, PR, etc.)		 USPS Ground Advantage €0.00 - €60.00 €6.95 5-9 Business Days
USPS Ground Advantage Over €60.00 Free 5-9 Business Days

Non-Continental U.S. regions include Alaska, American Samoa, Guam, Hawaii, the Marshall Islands, the Northern Mariana Islands, Palau, Puerto Rico, the U.S. Virgin Islands, and U.S. Armed Forces addresses.

2.4 International Destinations Outside the EU

For selected international destinations outside the EU, including Switzerland, the United Kingdom, and Norway, shipping rates are as follows:

Order Amount Shipping Cost
€0.00 - €300.00 €19.95
Over €300.00 Free

For non-EU destinations, import duties, taxes, and customs fees may be charged by the destination country and are the responsibility of the recipient.

3. Warehouses & Fulfillment

Our products may be stored in our Munich, Arlington, and Shenzhen warehouses. The actual shipping warehouse depends on product availability and destination.

3.1 Munich Warehouse

For products stored in our Munich warehouse, we use Deutsche Post or DHL Paket for domestic deliveries within Germany. For selected EU destinations outside Germany, we use FedEx Regional Economy.

3.2 Arlington Warehouse

For products stored in our Arlington warehouse, we use USPS or UPS for deliveries within the United States.

3.3 Shenzhen Warehouse

For pre-order items or products fulfilled directly from our Shenzhen warehouse, we arrange reliable international shipping based on destination and inventory status. For EU member states, OpenELAB covers applicable import duties and taxes under DDP service where required.

4. Inventory, Pre-orders & Split Shipments

  • Inventory Status: Please check the product page for real-time stock information. If an item is out of stock in our local warehouses, it may be marked as “Pre-order”.
  • Pre-order Fulfillment: Pre-order items may be shipped directly from Shenzhen or restocked to a local warehouse first before final delivery.
  • Split Shipments: If your order contains both in-stock and pre-order items, we may ship them separately. No additional shipping fee will be charged for split shipments caused by our fulfillment arrangement.

5. Customs, Taxes & Delivery Issues

5.1 Customs and Taxes

For EU Member States:
Whether shipped from Germany or China, OpenELAB covers applicable import duties and taxes under DDP service where required. Customers in EU member states should not be charged additional import duties or VAT upon delivery.

Important Notice for Non-EU Countries:
For destinations outside the European Union, such as Switzerland, Norway, and the United Kingdom, import duties, taxes, and customs fees may be charged by local authorities upon delivery. These fees are the responsibility of the recipient.

5.2 Damaged, Delayed, or Lost Parcels

Please inspect your parcel upon delivery where possible. If you notice visible damage, please report it to the courier and contact us as soon as possible. This does not affect your statutory consumer rights.

If your parcel is delayed, lost, returned to sender, or the tracking information has not updated for an unusual period of time, please contact us at info@openelab.io. We will assist you in checking the shipment status with the courier.

5.3 Incorrect Address or Failed Delivery

If a parcel cannot be delivered due to an incorrect or incomplete address provided by the customer, refusal of delivery, or failure to collect the parcel, additional shipping or return costs may apply.

6. VAT

For orders within the EU, VAT is collected at checkout according to the applicable destination rules. No additional VAT should be collected upon delivery for EU member state orders covered under our DDP shipping arrangement.

Customer Reviews

Based on 10 reviews
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I
Ivan Keller
Good quality and useful design

I used this in an automation test bench and the wiring layout was clear. The clear terminal blocks and stable automation switching were useful for industrial control experiments. It feels better suited to real I/O testing than a loose breadboard setup.

Thank you for choosing OpenELAB. We are glad the industrial control and automation module supported your relay control, RS485, CAN and factory IoT applications.

I
Iris Bennett
Reliable hardware for my project

I used this in an automation test bench and the wiring layout was clear. The clear terminal blocks and DIN-rail friendly wiring were useful for industrial control experiments. It feels better suited to real I/O testing than a loose breadboard setup.

Thanks for the review. Practical feedback on the Waveshare ESP32-S3 WiFi/BLE Relay 6CH RS485 DIN-Rail helps makers choose the right Waveshare hardware for relay control, RS485, CAN and factory IoT applications.

O
Oscar Liu
Stable after extended testing

I used this in an automation test bench and the wiring layout was clear. The clear terminal blocks and RS485 or CAN connectivity were useful for industrial control experiments. It feels better suited to real I/O testing than a loose breadboard setup.

Thanks for sharing your experience with the Waveshare ESP32-S3 WiFi/BLE Relay 6CH RS485 DIN-Rail. Feedback like this helps other customers compare Waveshare industrial control and automation module options for relay control, RS485, CAN and factory IoT applications.

B
Blake Liu
Worked exactly as expected

I used this in an automation test bench and the wiring layout was clear. The stable automation switching and ESP32-S3 control were useful for industrial control experiments. It feels better suited to real I/O testing than a loose breadboard setup.

Thank you for reviewing the Waveshare ESP32-S3 WiFi/BLE Relay 6CH RS485 DIN-Rail. We are glad this industrial control and automation module worked well for your relay control, RS485, CAN and factory IoT applications.

S
Sofia Garcia
Solid build and clean setup

I used this in an automation test bench and the wiring layout was clear. The stable automation switching and DIN-rail friendly wiring were useful for industrial control experiments. It feels better suited to real I/O testing than a loose breadboard setup.

Thanks for the review. Practical feedback on the Waveshare ESP32-S3 WiFi/BLE Relay 6CH RS485 DIN-Rail helps makers choose the right Waveshare hardware for relay control, RS485, CAN and factory IoT applications.

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