Designing low-voltage power distribution shouldn’t feel like assembling a kit from scratch. Yet many contractors still piece together transformers, enclosures, breakers, and terminal blocks in the field—adding labor time, increasing wiring complexity, and creating more opportunities for error. Prepackaged power supplies simplify that process by delivering a ready-to-install solution built for performance and consistency.
RIB® prepackaged power supplies from Functional Devices combine protection, distribution, and enclosure in one factory-assembled unit. Instead of sourcing multiple components and mounting them individually, installers can mount one panel and move on. The result is faster installs, cleaner panels, and a more reliable end product for building automation and control applications.
The Traditional Approach: Complicated and Costly
One option is to run high voltage to each location, install a transformer at each point, add circuit protection, and put in a switch. But running high voltage all over a site can get expensive fast. Another approach is to centralize your high voltage, build a custom low voltage power distribution panel, and wire everything to that single point. Sounds efficient—until you factor in the need for multiple transformers, terminal strips, primary and secondary circuit protection, switches, indicators, a convenience outlet, UL approval, and separation for high and low voltage areas. That’s a lot of work, cost, and time—with plenty of room for error during setup.
There’s a Better Way With Functional Devices, Inc.
As my dad says, “Shirley, there’s another way.” Functional Devices, Inc., offers pre-built, reliable, low-voltage power distribution solutions that simplify installation and cut troubleshooting time. With everything you need in one ready-to-go panel, you can get power where you need it faster, safer, and more cost-effectively—all while meeting code requirements and keeping your inspector happy.
Everything You Need With RIB®
The image above shows our PSH500AB10-LVC. The main breaker/switch is located on the outside. Directly below it is a convenience outlet with its own 4 Amp breaker. There is a two-piece lid. One covers the high voltage side of the supply and the other allows access to the low voltage circuits. Each of the secondary circuits are isolated from one another. They have their own 4 Amp circuit breaker, an ON/OFF switch, LED indicator, and pluggable terminal. The diagram below shows the internal connections of PSH500AB10-LVC.
One of the notable features of these supplies is the low voltage compartment (LVC). It provides Hi/Lo voltage separation for safety. All the secondary circuits in the supplies are Class 2 low voltage. Having the compartment to separate these connections from the high voltage means a technician can access the circuits for commissioning or troubleshooting in a safe and cost-effective manner. The secondary LED indicators aid in troubleshooting and the ON/OFF switches allow for maintenance of downstream loads. We also offer versions of these power supplies without all the bells and whistles and offer advantages over a one-off solution.
These UL-listed, distributed, low-voltage power supplies can allow anyone to standardize on a versatile solution to save time and money on their next control job. Why go with the Do-It-Yourself approach each time you spec a project? Give your installers and technicians what they want, a simple, consistent, straightforward power solution they can trust. That is why we say that Functional Devices, Inc. offers "Confidence & Peace of Mind in Every Box."
5 Must-Knows About RIB® Prepackaged Power Supplies
They Reduce Installation Time
Because RIB® prepackaged power supplies arrive factory-assembled, contractors eliminate the need to mount separate transformers, breakers, and terminal blocks. One enclosure replaces multiple components, helping crews move faster and close out jobs sooner.
They Help Prevent Wiring Errors
Field-assembling power distribution increases the risk of miswiring. Pre-engineered panels are built and tested before shipment, reducing callbacks and protecting margins.
They Deliver Built-In Circuit Protection
RIB® prepackaged units integrate overcurrent protection and distribution in one system. That means safer installations and better protection for connected devices.
They Create Cleaner, More Professional Panels
A single enclosed unit keeps power distribution organized and contained. The result is a neater panel layout that inspectors and end users appreciate.
They Improve Project Predictability
Using a standardized, ready-to-install power solution makes material planning simpler and labor costs more predictable. Contractors know what they’re getting, distributors know what they’re stocking, and project managers can keep timelines on track.
Simplify Power Distribution Without Sacrificing Performance
When power distribution is built and tested before it ever reaches the job site, everyone benefits. RIB® prepackaged power supplies reduce installation time, minimize wiring errors, and create a cleaner, more professional result inside every panel. Instead of spending hours assembling components, contractors can focus on completing projects efficiently and profitably—with confidence that the power foundation of the system is solid.
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.