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Description
BDD RELAY BOARD 4CH 3.3V3,3V 4 Channel High Low Level Triger Relay Module with Optocoupler High Low Level Triger Relay Module Features Maximum load: AC 250V 10A, DC 30V 10A. The chip optocoupler isolation, strong driving ability, stable performance, trigger current 5mA. Working voltage is 3. 3V. Every channel of the module can be set up by high jumper or low level trigger. Fault tolerant design, even if the control line is broken, the relay will not act. Power indicator
3,3V 4 Channel High/Low Level Triger Relay Module with Optocoupler
High/Low Level Triger Relay Module
Features
- Maximum load: AC 250V/10A, DC 30V/10A.
- The chip optocoupler isolation, strong driving ability, stable performance, trigger current 5mA.
- Working voltage is 3.3V.
- Every channel of the module can be set up by high jumper or low level trigger.
- Fault tolerant design, even if the control line is broken, the relay will not act.
- Power indicator (green), 4 relay status indicator (red).
- The interface design is humanized, all interfaces can be directly connected through the terminals, so it is very convenient.
- Module size: 73mm x 50mm x 18.5mm (length x width x height).
- There are 4 fixed bolt holes, holes 3.1mm, spacing 67mm x 44.5mm.
Specifications
- DC+: Connect the power positive pole.
- DC-: Connect the power negative pole.
- IN1-IN4: According to the setting of each way, the corresponding relay-operating can be controlled by high or low level.
Relay output: there is a 12 wire interface, all interfaces can be directly connected to lead to facilitate user use.
- NO1--NO4: Relay normally open, the relay suspends before pulling in, and then short-connect with the COM.
- COM1--COM4: Relay common interface
- NC1--NC4: Relay normal close, short connected with COM before pulling inand suspended after pulling in.
High and low level trigger option:
- S1-S4 is the high level trigger selection of relay 1 Channel - 4 Channel.
- When COM is short connected with LOW, the corresponding relay is LOW level trigger, while when COM is short connected with high end is high level trigger.
Additional Information
| Device | Relay Module |
| Type | High/Low | Level Triger |
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4.5 ★★★★★
Based on 13 reviews
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Product Reviews
★★★★★ 5
Love it!
Format: Paperback
My 6 year old LOVES this book! I read it to him every night that I know it by heart. He’s extremely fascinated by black holes, and It has really got him curious about cells and atoms.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 13, 2026
★★★★★ 4
2nd book if you have black light
Format: Hardcover
The book is ok, with the same plot as "there was an old lady who swallowed a fly" but there is a second book that goes back to front if you have a blacklight. Some of the pages were not printed well with the invisible ink but I really liked that second book better, as it explains the terminology like quarks and atoms. It is a fun book but having a black light is a must.
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Reviewed in the United States on January 19, 2024
★★★★★ 5
Fun book to read!
Format: Paperback
Such a fun book for my boys! They love it!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 14, 2025
★★★★★ 5
Great Book!
Format: Hardcover
This book is perfect for my 4yr old grandson who is OBSESSED with planets and space! He loves it and has already memorized the story.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 25, 2022
★★★★★ 5
Great for space loving kids
Format: Hardcover
My son is super into space and planets and loved this book. It's funny and informative. My son was asking me what stuff was and why it was being eaten up.
What makes it better is with a blue light in the dark you can read the book backwards as a whole new glow in the dark story!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 3, 2023