Build Smarter Panels: Optimize Space and Reliability with Functional Devices Transformers

Henry Smith
5 min read

Control panels keep getting tighter. Loads are more complex. Timelines are shorter. And expectations—from both customers and inspectors—keep climbing. For panel builders, transformer selection is no longer a checkbox decision. It’s a design choice that directly affects space utilization, reliability, and long-term performance.

Why Does Transformer Selection Matter in Modern Panel Design?

Transformers often sit quietly in the corner of a panel, but their impact is anything but small. The wrong footprint can crowd terminal blocks and relays. Limited tap options can complicate voltage matching. Poor thermal performance can shorten component life.

Functional Devices approaches transformer design from a panel-first perspective. Compact footprints help free up enclosure space. Clearly labeled terminals and taps reduce wiring errors. Solid construction supports long service life, even in demanding control environments.

How Do Functional Devices Transformers Help Save Panel Space?

Space optimization starts with form factor and mounting flexibility. Functional Devices offers transformers that work with the way panels are actually built—not idealized layouts.

TR50VA008 – 50 VA Control Transformer

A compact transformer with a foot and dual threaded hub mount. This model simplifies installation through conduit knockouts while delivering reliable 120 VAC control power from a wide range of input voltages (480/277/240/208 VAC). Its small footprint frees up interior panel space for other critical devices.

TR50VA015 – 50 VA Multi-Tap Transformer

This 50 VA Class 2 transformer handles 480/277/240/208/120 VAC primaries with a 24 VAC secondary, and mounts via foot and single threaded hub. It’s ideal when panels must support multiple input voltages without stocking separate units, reducing both parts inventory and panel redesign time.

TR75VA001 – 75 VA Transformer (120 VAC Primary)

For moderate control loads, the TR75VA001 supports 120 VAC input with a 24 VAC secondary and includes built-in circuit breaker protection. Its foot and single-threaded hub mounting make it a versatile choice for many general-purpose panels.

TR75VA004 – 75 VA Multi-Tap Control Transformer

When you need broader input flexibility (120/208/240/480 VAC) and a 24 VAC output, this transformer does the job with foot and single-threaded hub mounting. Multi-tap capability means the same transformer design can fit diverse panels without multiple SKUs.

TR100VA001 – 100 VA Transformer With Circuit Breaker

For larger control circuits or heavier loads, the TR100VA001 offers 100 VA output at 24 VAC from a 120 VAC primary with circuit breaker protection and flexible mounting. It’s a solid choice when standardizing one transformer size across heavier-duty panels.

Explore our available transformer models and mounting styles on our Functional Devices transformers product page.

What Specifications Should Panel Builders Care About Most?

Panel builders tend to evaluate transformers through a practical lens. The specifications that matter most are the ones that reduce risk, rework, and callbacks:

  • VA rating accuracy to ensure connected loads are fully supported
  • Multi-tap primary options for common input voltages such as 120V, 208V, and 240V
  • Thermal performance that limits heat buildup inside tight enclosures
  • Clear terminal identification to speed up installation and inspection

Functional Devices transformers are engineered to meet published ratings consistently, helping ensure panels perform as designed—not just at startup, but throughout their service life.

How Do Multi-Tap Transformers Simplify Panel Standardization?

Standardization is one of the fastest ways to improve productivity and control costs. Multi-tap transformers make that easier.

Many Functional Devices transformers support multiple primary voltages in a single unit. That allows panel builders to reuse the same transformer design across different projects, facilities, or regions without redesigning the panel. The result is fewer drawings to maintain, fewer SKUs to stock, and fewer chances for wiring errors during installation.

Where Do Reliability and Safety Show Up in Real Installations?

Reliability isn’t just about avoiding failures. It’s about avoiding downtime, troubleshooting, and preventing uncomfortable conversations after commissioning.

Functional Devices transformers are built with reliability in mind:

  • Durable windings and insulation materials
  • Designed to meet applicable UL requirements
  • Consistent secondary voltage under load
  • Construction suited for continuous-duty control applications

These characteristics support safer panels, smoother inspections, and long-term confidence in the finished system.

For additional background on transformer fundamentals and selection considerations, refer to this Functional Devices blog: 4 Essential Things to Know About Transformers.

How Can Sourcing And Support Make Transformer Selection Easier?

Even the right transformer can create problems if it’s difficult to source. Functional Devices supports panel builders through a broad distributor network, making it easier to get products quickly and locally.

Find an authorized distributor near you.

Frequently Asked Questions About Functional Devices’ Electrical Transformers

What VA rating is most common for control panels?

Many control panels fall in the 50–100 VA range, depending on the number of relays, controllers, and sensors being powered. Proper load calculation is key.

When should I choose a hub-mounted transformer?

Hub-mounted transformers are ideal when internal panel space is limited. They install through a knockout, freeing up room inside the enclosure.

Do Functional Devices transformers support multiple input voltages?

Yes. Many models include multi-tap primaries that support common control voltages, reducing the need for multiple transformer types.

Can I standardize one transformer across multiple panel designs?

Multi-tap transformers make standardization easier, allowing a single design to support different input voltages with minimal changes.

Are these transformers suitable for continuous operation?

They are designed for control applications that require consistent, reliable power over long service intervals.

Build Smarter Panels Confidently with Functional Devices’ Transformers 

Smarter panels start with smarter component choices. By selecting transformers designed for compact layouts, flexible voltage requirements, and dependable performance, panel builders can reduce complexity without sacrificing quality.

Functional Devices transformers help support efficient panel design, reliable operation, and professional results—project after project. Explore the full transformer lineup and find the right fit for your next build.