ERB4U Extensible Relay: 30V/10A/Channel, Python Serial Control

ERB4U Relay: 30VDC/32A, Extensible, Programmable

Introduction

ERB4U series is a relay module that can be programmed through a USART serial port. Only 1 USB Type-C cable is required to read/control multiple relay modules simultaneously. Each ERB4U board could deliver a different power rail.

Each relay: max 30VDC/10A, 1NO + 1NC
Total output: max 30VDC/32A
Working Principle: The ERB4U device receives USART commands from the USB or J1 connector (USART1) and passes the original USART commands to downstream ERB4U devices through the J6 connector (USART2). Therefore, multiple ERB4U modules can be controlled by 1 USB type-C cable from PC. Upon receiving a command, the ERB4U will check its local address and will only execute the action if the address matches.
USART control: read and write
Address Setting: 4-bit DIP switch sets the address from 0 to 15, multiple ERB4U can share the same address
Protection Circuit: input reverse polarity protection, MCU and relay optocoupler isolation, support R/L load
GitHub: Python API & example code
Temperature Range: -40 to 85 ℃

Application

Industrial Automation Control
Automated Test Equipment
Embedded Electronic Device
Universities, Research Institutions, Laboratory
STEM Education, Training Institute

Catalog

Electrical Parameter

1 Channel Output	1) 30VDC/10A MAX 2) 1NO/1NC
Total Output	1) 30VDC/32A MAX
USART Read	1) Single/all relay ON/OFF state 2) Number of relays on PCBA 3) Temperature sensor value 4) LDO voltage, nominal 3.3V 3) PN/SN, hardware/firmware version
USART Write	1) Turn ON/OFF single/all relays
Address Config	1) 4-bit DIP Switch: sets the address from 0-15 2) Multiple ERB4U can share the same address
Protection Circuit	1) Input reverse polarity protection 2) Optocoupler isolation between MCU and relay 3) Support resistive or inductive (R/L) load
GitHub	Python API & example code
Temperature Range	-40 – 85 ℃

Download

File	Format	Link
User Manual	PDF
Communication Protocol	Excel
2D Drawing	DXF，DWG, PNG
3D Model	PDF 3D, SLDPRT
Test Report	PDF
GitHub	Python API & 例程代码

2D/3D Drawing

GitHub

Python API & example code

Applications

Automative line & tester

Smart IoT

Programmable switch

STEM lab

Video Tutorial

Product Selection

Parameter	ERB4U-4	ERB4U-8	ERB4U-12
Extensible & Programmable
Number of Relays	4	8	12
Total Output	30V/32A	30V/32A	30V/32A
Each Channel: 1NO/1NC	30V/10A	30V/10A	30V/10A
Address	4-bit	4-bit	4-bit
Protection Circuits
Temperature Range	-40 – 85 ℃	-40 – 85 ℃	-40 – 85 ℃

Price (USD)

Quantity	ERB4U-4	ERB4U-8	ERB4U-12
1	$40	$45	$50
5	$38	$43	$48
10	$37	$42	$47
25	$36	$41	$46
50	$35	$40	$45