The Best Rust Protection for Air Conditioners

The CATIII system offers an effective rust protection solution for air conditioners. With a track record spanning over three decades, CAT Systems has been a leading provider of Electronic Rust Protection products. The CATIII Electronic Rust Protection System embodies our commitment to combat rust in diverse environmental conditions.

Air Conditioner Unit with CAT Protection

Technical & Design Summary

The CAT System utilizes an optimal blend of voltage and frequency to deliver maximum corrosion inhibition in air conditioner systems. The Modular Design allows for easy expansion, with the Main Generator Module featuring 2 output circuits. Each circuit can support up to 6 coupler pads linked in series, providing a total capacity of 12 Coupler Pads for both circuits. Additional coupler pads can be seamlessly added to enhance system performance.

Why Choose CAT for Your Air Conditioner

While traditional methods of corrosion control, such as coatings, are effective for certain applications, they may not fully address the unique challenges faced by air conditioner systems. The CAT System pioneers a different approach by employing alternating current (AC) with specific waveforms and frequencies to interrupt and slow down the corrosion process.

Comprehensive Coverage

CAT reaches virtually all metallic surfaces, both internal and external, offering consistent protection even in hard-to-reach areas where coatings often fall short. It ensures full-body defence against corrosion risks.

Long-term Solution

Unlike traditional coatings that fade or peel over time, CAT provides continuous, long-lasting protection. Once installed, it delivers ongoing corrosion suppression without the need for reapplication.

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Continuous Protection


The system operates silently 24/7, providing round-the-clock corrosion defence. It ensures your air-conditioning unit is always protected, no matter the season or environmental conditions.

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Environmentally Friendly


CAT uses no chemicals or harmful substances, eliminating the risk of leakage or contamination. It's a safe, eco-conscious choice for homes, businesses, and sensitive environments alike.

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Non-Interference


CAT is fully compatible with air-conditioning control systems and electronics. It operates independently without disrupting any onboard circuits, diagnostics, or automated functions.

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Easy Installation


The system is designed for fast, hassle-free installation with no drilling or structural changes required. It can be fitted to new or existing units in minutes using standard tools.

Technical Specifications

CAT System Technical Components

System Capabilities

  • Compatible with both 12VDC and 24VDC systems
  • Option for 240VAC conversion available
  • Modular design for easy expansion
  • Main Generator Module with 2 output circuits
  • Supports up to 12 Coupler Pads (6 per circuit)
  • Additional coupler pads can be added as needed

Paint Protection Bonus

Anecdotally we have found the CAT slows down paint oxidation, further preserving the integrity of air conditioner units.

Aircon FAQs

What is electronic rust prevention?

How does CAT work?

Is CAT protection expensive?

Does CAT come with a warranty or guarantee?

What voltage is needed to power the CAT system?

Is CAT effective on larger air conditioner units?

Is it practical to install CAT on air conditioner units with existing rust?

Will CAT interfere with the operation of air conditioner units?

Is CAT compatible with existing protective coatings?

This is what our customers say....

“During the last 6 years or so we have installed well over 100 CAT SYSTEM electronic rust control units on the high rise outside air-conditioners. These air-conditioners are exposed to salt air 24 hours a day. In all that time there has been only one failure, the air-conditioner rusted because CAT SYSTEM connection was not switched on!

CAT Systems Australia are most professional to deal with, providing excellent service and marketing a high-quality unit with a most satisfactory performance result. I have no hesitation in recommending CAT SYSTEMS for complete rust protection.”

L&M Electronics Pty Ltd