When people try to understand magnetic switches, the easiest analogy is actually an iPad’s smart cover. Both rely on the same underlying principle—the Hall effect.
In recent years, magnetic switches have gone from a niche technology to a favorite among gamers and enthusiasts, widely praised as “physical cheats” thanks to their extreme sensitivity and customizability. But how exactly do they work? And why did such a promising technology once disappear from the market?
Let’s break it down.
The working mechanism of a magnetic switch can be explained through the Hall effect:
When an electrical current flows through a conductor, electrons naturally move along the shortest path. If a magnet approaches the conductor perpendicularly, the charged particles begin to deflect—negative charges move in one direction, positive charges in the opposite direction.
By measuring the voltage difference caused by this deflection, the system can determine how close the magnet is. The closer the magnet, the stronger the voltage signal.
This is exactly how an iPad knows your cover is closed—and how a magnetic keyboard switch knows when you’re pressing a key. Each key is assigned a voltage threshold. Once the magnet moves close enough to surpass that threshold, the switch registers a keystroke.
It’s fast. It’s linear. And it’s incredibly precise.
The story begins in 1932, when Phillip Kenneth McGaul invented the first micro switch. His company, Micro Switch, soon became a major supplier for industrial, aerospace, and military applications—fields where reliability matters more than cost.
By the 1960s, Micro Switch had expanded into keyboard technology. At the time, traditional reed switches were struggling with durability, and a 10-million keystroke lifespan was already considered high-end.
But Micro Switch wanted military-grade performance.
In 1965, the company introduced the world’s first Hall-effect keyboard switch.
Its construction was simple but revolutionary:
A central stem magnet
A Hall sensor
A return spring
When pressed, the magnet approached the sensor and triggered the input.
A 1983 catalog later revealed that these switches were rated for 100 million actuations—a number that still outperforms most modern mechanical switches.
In a 1998 Honeywell (formerly Micro Switch) technical report, engineers described a 90-key test machine that successfully achieved 30 billion total cycles.
Even today, that durability is insane.
Unlike MX-style switches, which rely on metal contacts and thus produce a force curve “bump,” magnetic linear switches offer:
A nearly perfectly straight force-travel curve
Ultra-smooth keystrokes even without lubrication
Full anti-ghosting thanks to precise sensing
Up to 30% faster input compared to early keyboards
So with all these advantages… why did magnetic switches almost vanish?
The issue wasn’t technology—it was cost and complexity.
Micro Switch focused on pushing the upper limit of performance. But mainstream consumers didn’t need that level of engineering.
MX-style mechanical switches, by comparison:
Require no power supply
Are cheaper to manufacture
Are smaller and easier to integrate
Have simpler PCB requirements
Fit mass-market price expectations
In the early PC era, a keyboard was like an internal organ—you needed one. Later, it became more like clothing: you just needed something comfortable, not military-grade tech.
After Honeywell acquired Micro Switch in 1950, it eventually sold off the keyboard division in 1993, stating that while profitable, the business no longer aligned with corporate strategy.
With that, magnetic switches faded into obscurity.
Around 1978, Omron released a new style of magnetic switch that finally achieved miniaturization.
Its design was unique:
Magnet A: mounted on the stem
Magnet B: inside the stem
Magnet C: movable magnet in the housing
As the switch was pressed, magnets B and C first repelled, creating tactile feedback. At the bottom, they attracted, producing a clicky sound. It was a magnetic switch with both tactility and acoustics—decades ahead of its time.
Today’s Hall-effect keyboards benefit from modern sensors, MCU algorithms, and more refined PCBA design. Magnetic switches allow features like:
Adjustable actuation distance
Rapid trigger / dynamic reset
Multi-stage analog input
Near-zero debounce delay
Higher polling rates
Gamers call them “physical cheats” for good reason. With ultra-low actuation points, a light tap can trigger a key faster than traditional mechanical switches.
But ironically, beginners often struggle with them at first—the sensitivity is too high.
That’s where software tuning comes in. Fine-tuning actuation, reset points, dead zones, and curves lets players customize the keyboard to their exact playstyle.
In reality, even many regular mechanical keyboards require some level of configuration. Magnetic switches just give you far more control.
Magnetic switches were once the pinnacle of keyboard engineering, born from aerospace-grade reliability standards. They disappeared due to manufacturing limitations and market economics—not because they were inferior.
Today, with modern sensors and software, Hall-effect technology has returned stronger than ever, transforming from “obsolete tech” into a new era of precision input—and a favorite among competitive gamers.
Magnetic switches didn’t just come back.
They evolved.
