If you live in a mid-century home, you've probably encountered general electric low voltage switches without even realizing what they were at first. They don't look like your standard modern toggle switches, and they certainly don't feel like them either. Instead of a firm "thwack," you get a light, springy click, often followed by a mysterious thumping sound coming from inside the walls or up in the attic.
These systems were the "smart homes" of the 1950s and 60s. While they might seem like ancient technology today, they were incredibly forward-thinking at the time. If you're lucky enough to have an original system that's still kicking, or if you've just moved into a house that features them, there's a bit of a learning curve. Understanding how they work and how to keep them running is much easier than you might think.
How the System Works (In Plain English)
Standard electrical systems in most modern homes send 120 volts of electricity directly to the light switch on your wall. When you flip that switch, you're physically completing a high-voltage circuit. General electric low voltage switches work completely differently.
Think of it like a remote control for your lights. The switch on your wall only carries about 24 volts of electricity—barely enough to give you a tickle, though you still shouldn't go poking around with a screwdriver while it's live. When you press that wall switch, it sends a tiny pulse of electricity to a relay.
That relay is the real heavy hitter. It's usually tucked away in a metal box in the basement, attic, or a closet. When it receives the signal from your wall switch, it mechanically flips a high-voltage internal switch that actually turns the light on or off. This separation of the control (the wall switch) and the load (the relay) allowed builders to do some pretty cool things back in the day.
Why Your House Has This Setup
You might wonder why builders went through all this trouble. Back in the post-WWII housing boom, copper was expensive, and labor was shifting. By using low-voltage wiring for the switches, electricians could use much thinner, cheaper wire (similar to bell wire or telephone wire) to connect all the switches to the central relay panels.
Another huge perk was the ability to have "master control" stations. You could have a single panel by the front door or in the master bedroom that could turn off every light in the house with one button. That was basically science fiction in 1955! It also made it incredibly easy to have "three-way" or "four-way" switching, where multiple switches control the same light. In a standard high-voltage setup, that requires complex wiring; in a low-voltage system, you just parallel the switches together.
Common Issues You'll Probably Run Into
Like any mechanical system that's been around for fifty or sixty years, things eventually start to act up. The good news is that these systems are remarkably robust. They were built to last, but even the best components have a shelf life.
The Sticky Switch
One of the most frequent complaints involves the physical buttons on the wall. Over decades, dust, kitchen grease, and general grime can get inside the switch mechanism. You might find that you have to press the button just right, or maybe it gets stuck in the "on" position.
If the switch is sticking, it can actually be dangerous for the rest of the system. Because these switches send a momentary pulse to the relay, a stuck switch will send a continuous pulse. Those relays aren't designed to handle constant power—they'll get hot, start to smell like burnt plastic, and eventually burn out. If you notice a switch isn't "springing" back to the center position, you should address it immediately.
The Buzzing Relay
If you hear a loud humming or buzzing sound coming from your ceiling or a closet when a light is on, that's usually a sign that a relay is failing. Remember that "thump" sound I mentioned? That's the sound of the solenoid inside the relay physically moving the contacts. When they get old, the internal parts can get weak or dirty, leading to a buzz. Sometimes a relay will just "give up" and refuse to click at all, meaning your light is stuck either on or off regardless of what you do at the wall.
Troubleshooting Your Switches
Before you call an electrician—who, by the way, might look at your low-voltage system like it's an alien spacecraft—there are a few things you can check yourself.
First, try to isolate the problem. Is it just one light that won't turn on? If so, it's probably the switch or the relay for that specific circuit. If none of the lights in a certain area are working, you might have a blown fuse or a dead transformer. The transformer is what converts your home's 120V power down to the 24V the switches use. If that goes out, the whole system goes dark.
If you suspect a bad switch, you can sometimes test it by carefully removing the wall plate and touching the common wire to the "on" or "off" wire. If the light pops on instantly, you know the relay is fine and the switch was the culprit. Just be sure you're comfortable working around wires before you try this!
Modernizing and Finding Parts
The most common question people ask is: "Can I still get parts for this?" The answer is a resounding yes. While General Electric has moved on from many of its older designs, there are still companies manufacturing compatible components.
The original GE "rocker" switches with the little bumps on them are iconic, but they can be hard to find in mint condition. However, GE still produces the RS2 series switches, which are the modern replacements. They look a bit different—more of a sleek, flat rocker—but they fit into the old brackets and work with the old wiring perfectly.
As for relays, the GE RR7 is the gold standard replacement. If you have an old RR2, RR3, or RR5 relay that has died, the RR7 is usually the direct successor. They are surprisingly affordable and relatively easy to swap out if you mark your wires carefully.
Should You Replace the Whole System?
Sometimes, homeowners get frustrated and want to "rip it all out" and put in modern high-voltage wiring. Honestly? I'd think twice about that.
Rewiring an entire house to move from low-voltage to high-voltage is a massive, expensive undertaking. You'd have to tear into the drywall, run new heavy-gauge Romex everywhere, and replace every single electrical box.
On the flip side, keeping the low-voltage backbone actually gives you some cool modern advantages. Since the switches are just sending simple 24V signals, it's actually very easy to integrate them with modern smart home controllers. There are kits available today that let you bridge your old general electric low voltage switches with things like Alexa or your smartphone. You get the vintage aesthetic and the "smart" functionality without the $20,000 rewiring bill.
A Few Final Tips for Success
If you're going to live with these switches, just remember to be gentle with them. They don't need a heavy hand; a light tap is all it takes. Also, it's a good idea to locate your relay panels before you have an emergency. Usually, they're behind a metal plate in a hallway or tucked away in the garage. Labeling them now will save you a ton of headache later when a light won't turn off at 11:00 PM.
These systems are a unique piece of architectural history. They might be a little quirky, and they definitely sound different than what your neighbors have, but once you understand the basic relationship between the switch and the relay, they are incredibly easy to maintain. Plus, there's something deeply satisfying about that mechanical "clack" when you turn on the kitchen lights—it just feels like quality.