> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt

# Industrial 4-Channel Relay Module

**Type:** Product page · **SKU:** FIT0827 · **Brand:** [DFRobot](https://core-electronics.com.au/brands/dfrobot-australia)
**Page:** https://core-electronics.com.au/industrial-4-channel-relay-module.html ([markdown](https://core-electronics.com.au/industrial-4-channel-relay-module.html.md))

The module adopts the standard Modbus RTU protocol, the communication interface supports RS485 or RS232 and supports communication baud rates of 2400, 4800, 9600...

## Pricing

- **Price:** $53.60 (inc GST) — $48.73 AUD, exc GST
- **Quantity discounts:** 6+ $46.29 (exc GST) · 12+ $44.35 (exc GST)

## Availability & dispatch

- Available with a lead time — expect dispatch between Sep 01 and Sep 07.

## How to buy

- **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=FIT0827:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart.
- **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/FIT0827:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.)
- **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there.
- **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works)
- **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt
## Description

The module adopts the standard Modbus RTU protocol, the communication interface supports RS485 or RS232 and supports communication baud rates of 2400, 4800, 9600, 19200, 38400 (default 9600). Each relay output is independent and can be connected to different load devices, such as 220V electric lights, 24V solenoid valves, etc. Both AC and DC devices can be controlled. Each relay output contact is isolated and can set 0-255 device addresses. It can be switched on and off very quickly. This industrial 4-channel relay module allows you to control your electrical equipment only through one computer serial port. It supports DC7-30V wide voltage power supply, optocoupler isolation, four-way switching input, and four-way relay output. The management and controlling of electrical equipment can be completed by a computer, which makes this module able to be widely used in scenarios like factories, hotels, etc., as well as lighting control in stages, homes, cinemas, etc., and can also be used for motor control, production line control, etc.

The module adopts the standard Modbus RTU protocol, the communication interface supports RS485 or RS232 and supports communication baud rates of 2400, 4800, 9600, 19200, 38400 (default 9600). Each relay output is independent and can be connected to different load devices, such as 220V electric lights, 24V solenoid valves, etc. Both AC and DC devices can be controlled. Each relay output contact is isolated and can set 0-255 device addresses. It can be switched on and off very quickly. The module adopts the standard Modbus RTU protocol, the communication interface supports RS485 or RS232 and supports communication baud rates of 2400, 4800, 9600, 19200, 38400 (default 9600). Each relay output is independent and can be connected to different load devices, such as 220V electric lights, 24V solenoid valves, etc. Both AC and DC devices can be controlled. Each relay output contact is isolated and can set 0-255 device addresses. It can be switched on and off very quickly.

 **Specification**- Contact Capacity: 10A/30V DC, 10A/250V AC
- Durability: 100,000 times
- Data Interface: RS485
- Rated Voltage: DC 7-30V
- Power Indicator: 1 red LED indicator
- Output Indicator: 4 red LED indicators
- Temperature Range: industrial grade, -40°C ~ 85°C
- Default Communication Format: 9600, n, 8, 1
- Baud Rate: 2400, 4800, 9600, 19200, 38400
- Size: 115\*95\*41mm / 4.53\*3.74\*1.61 inch
 
 **Parts List**- Industrial 4-Channel Relay Module x1
 
 **Resources**[Instruction Manual](https://core-electronics.com.au/attachments/uploads/FIT0827.pdf)

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/f/i/fit0827.jpg)