How to Choose Relays and Current Sensors
Before we begin, feel free to read the other blog posts in this series:
Build-A-RIB Workshop Part 1
Build-A-RIB Workshop Part 2
Build-A-RIB Workshop Part 3
These were some of the first blogs I wrote here, and I wasn't that great of a writer (I'm still not that great of a writer...)but the information there is solid, helping you choose relays, current sensors, and even assemble your own RIB. Go check them out!
Naming Convention for Functional Devices Transformers
Now let's look at how we name our transformers. I wanted to include a pun here about how our transformer names contain information that's "more than meets the eye," but in reality, our transformer names are pretty simple, so let's just do this. We'll do this by breaking down an example. Take the TR50VA001US, for instance. The first big indicator that you're working with a transformer is the "TR" prefix. Shocking, I know. The main point is that all of our transformer names start with that prefix, so look for it when looking for a transformer.
The next part to look at in the transformer name is the "50VA". This section of the name indicates the transformer's VA rating. In this case the transformer is capable of outputting 50 VA but this number can be anywhere from 20VA to 375VA for what we have.
The next part of the name to look at is the "001". If you thought that this number at the end of each transformer name told you absolutely nothing about the transformer, then you would be correct. It's just a number. If you want to know important information about the transformer, such as primary and secondary voltages, you'll need to look at the transformer quick reference here.
If you're wondering what the number under the "style" column is, then look at the style guide here.
These two links are mainly what I use when selecting a transformer and will tell you most of what you need to know.
Made in the USA
The last part of the of the transformer name is the "US". This simply means that this transformer was made in the good ol' United States of America.
That's basically it for transformers. The name actually doesn't tell you much, so make good use of the Transformer quick reference and Style Guides. Of course if you have any questions on selecting a transformer, you can always contact us.
About Functional Devices, Inc.
Confidence and Peace of Mind in Every Box
At Functional Devices, Inc., we have been designing and manufacturing high-quality electronic components in the USA since 1969. Our mission is simple: to enhance lives in buildings and beyond by delivering reliable, innovative solutions for the building automation industry. Our product lineup includes RIB® relays, current sensors, power controls, power supplies, transformers, lighting controls, and more—each designed to meet the highest industry standards.
We test 100% of our assembled products, ensuring an exceptionally low failure rate—less than 1 in 16,000 in the field. This commitment to excellence means you get products that perform reliably, reducing downtime and increasing efficiency. With every Functional Devices product, you receive more than just a component—you gain confidence and peace of mind knowing your systems are built on trusted, field-proven technology.