USA Made CPI Switches Help Solve Rare Earth Switch Sourcing Challenges

Rich Casamento / June 15th, 2025

Navigating Rare Earth Supply Challenges: Why CPI Switches Are a Smart Alternative for Critical Applications

In recent years, the global supply chain for rare earth elements has grown increasingly strained. Due to geopolitical tensions and the concentration of rare earth refining in a few countries (notably China), prices and availability for rare earths have become unstable. This geopolitical instability, trade restrictions, and rising demand for green technologies have put pressure on industries that rely on components made with elements like neodymium, samarium, cerium, and yttrium. Among the affected technologies are many types of switches and sensors that depend on rare earth-based magnets or dopants to operate effectively.

This supply instability has forced engineers and manufacturers to look for alternatives—especially in rugged, mission-critical applications. One viable solution lies in rare-earth-free electromechanical switches, particularly those manufactured by CPI (Control Products Inc.)

The Rare Earth Problem in Switches and Sensors

Many modern switches and sensors use rare earth magnets or compounds for their exceptional magnetic or optical properties. A number of these switches are replaceable by CPI rare-earth free alternatives. Common types include:

Hall Effect Switches with Rare-Earth Magnets

Rare Earth Dependency: Neodymium or Samarium magnets used to trigger the Hall sensor.
Replacement With CPI? ✅ Yes, in many cases
Use Case: Detecting mechanical position or end-of-travel limits.
Why CPI Works: CPI switches can perform contact-based position sensing with excellent durability and waterproofing (up to IP68/IP69K), without magnetic fields or rare earths.

Reed Switch Assemblies with Rare Earth Magnets

Rare Earth Dependency: External magnets (often NdFeB) actuate internal reed contacts
Replacement With CPI? ✅ Yes, for non-contact or near-contact applications where ruggedness is more important than non-contact operation.
Use Case: Industrial proximity sensing, door or panel open/close detection.
Why CPI Works: Reed switches can fail in vibration or wet environments—CPI’s mechanically actuated switches are designed for severe vibration, moisture, temperature extremes, etc.

Magnetic Proximity Switches (e.g. in heavy equipment)

Rare Earth Dependency: Internal magnetic sensing.
Replacement With CPI? ✅ Yes, in most industrial and mobile equipment applications.
Why CPI Works: CPI switches are widely used in defense, marine, rail, and heavy equipment, making them ideal replacements where rare-earth magnet sensors might fail or be over-engineered.
Use Case: Heavy trucks, military vehicles, marine systems, aerospace ground support.

These technologies, while powerful, are increasingly at risk from volatile pricing, regional monopolies, and supply bottlenecks.

Applications Most Affected

Rare earth-based switches and sensors are widely used in:

Automotive systems (e.g., position sensors, throttle controls)
Heavy equipment (e.g., proximity and motion sensors)
Aerospace and defense (e.g., gear position sensors, control feedback systems)
Medical devices (e.g., magnetic encoders, optical sensors)
Industrial automation (e.g., magnetic safety switches)

CPI switches already provide solutions in many of these settings, where there is demand for high durability, waterproofing, and long service life. The mission critical nature of many of these applications makes the use of rare earth-free solutions even more appealing.

CPI Switches: Durable, Rare-Earth-Free Replacements

CPI’s rugged electromechanical switches are built for severe environments and do not rely on magnetic or rare earth components. They provide precise, contact-based actuation in fully sealed enclosures, and many models meet IP68/IP69K waterproofing standards and MIL-STD shock/vibration requirements.

There are several families of switches that fit nicely into rare earth sensor applications and they may even boast a lower per unit cost at quantity as rare earth materials get more and more expensive.

J4 Series Waterproof Limit Switches

Best For: Replacing magnetic reed switches and Hall effect sensors
Applications: Marine equipment, access doors, vehicle panels
Key Features:

Fully submersible (IP68/IP69K)
Custom bracket mounting options
Excellent corrosion resistance

E1 Series Harsh Environment Switches

Best For: Replacing magnetic proximity switches in off-road and industrial equipment
Applications: Construction, agriculture, oil and gas
Key Features:

Wide temperature range (-65°F to 225°F)
Resistant to vibration, dust, and chemicals
Proven military and industrial use

B9112 Series Precision Limit Switches

Best For: Replacing rare earth-based precision sensors
Applications: Robotics, aerospace, automation
Key Features:

Tight mechanical tolerances
Long service life with consistent actuation
Compact and configurable

Why Now Is the Time to Switch

With rare earth supplies facing long-term uncertainty, USA made CPI switches offer a stable, reliable, and field-proven alternative for many commercial, industrial, and defense applications. Their mechanical design avoids the complexity and cost of magnet-based sensors while still delivering the rugged performance engineers demand.