- Delay-on-make (DOM) or
- Delay-on-break (DOB)
Let's look at a simple scenario to better understand the difference between DOM and DOB.
Suppose you have some security floodlights that you want to turn on for 20 minutes when an unsavory character triggers a nearby motion sensor. What would happen if a DOM relay were being used?
With a DOM relay, the motion sensor would have to be triggered for 20 minutes before the lights turned on and would turn off immediately once the trigger is gone. Under this setup, the lights don't turn on and the unsavory character gets away. However, if a DOB relay were being used, the results would be quite different.
With a DOB relay, the motion sensor only needs to be triggered for a brief time before the lights turn on. Once the trigger is gone, the lights will remain on for the 20 minutes, and the unsavory character gets caught.
If you have an application that involves timing take a look at the following products:
Time Delay Relays in Building Automation Systems
Time delay relays are essential components in building automation systems, providing reliable control for lighting, HVAC, and security systems where precise timing is critical. Whether you need a delay-on-make to prevent short cycling in a fan system or a delay-on-break to keep lights on after motion is detected, these relays can enhance the effectiveness of your building automation strategies while ensuring systems operate exactly as intended. Using the right type of time delay relay helps protect equipment, extend system life, and maintain comfort or safety across your facility.
Integrating time delay relays into building automation solutions also supports smarter energy management by controlling how and when equipment runs, reducing unnecessary energy consumption without sacrificing performance. Functional Devices offers a range of time delay relays, such as the RIBD01BDC and RIBD02BDC-DOB, making it easy to find a solution that fits your timing needs within your automation projects. If you're looking to improve your building’s control capabilities while simplifying installations, these RIB relays are a practical, dependable choice.
As always, if you have any questions or need help selecting the right relay, be sure to contact us.
About Functional Devices, Inc.
Functional Devices, Inc., located in the United States of America, has been designing and manufacturing quality electronic devices since 1969. Our mission is to enhance lives in buildings and beyond. We do so by designing and manufacturing reliable, high-quality products for the building automation industry. Our suite of product offerings include RIB relays, current sensors, power controls, power supplies, transformers, lighting controls, and more.
We test 100% of our products, which leads to less than 1 out of every 16,000 products experiencing a failure in the field.
Simply put, we provide users of our various products confidence and peace of mind in every box.