Many older homes and buildings still rely on ceramic fuses for circuit protection. These simple fuses have been used for decades to provide basic protection. However, ceramic fuse technology has significant limitations compared to modern electrical safety options now available.

While ceramic fuses were better than having no protection, technology has long since surpassed these dated devices. Today’s homes and businesses should upgrade to more advanced circuit breakers or residual current devices (RCDs), substantially improving safety and convenience. Upgrading from old switchboards provides smarter, reusable, and adjustable protection.

Here’s a closer look at why it’s time to retire those outdated ceramic fuses for good.

What Are Ceramic Fuses and How Do They Work?

Ceramic fuses consist of a thin wire filament enclosed in a heat-resistant ceramic or glass tube. They are installed in electrical panels to protect each circuit. When a circuit is overloaded, the thin fuse wire heats up and melts, breaking the connection and cutting power to that circuit. This helps prevent overheating and fires.


The main drawback is that once a ceramic fuse blows, it has to be fully replaced. The melting fuse wire damages the fuse, so it cannot simply be reset. Finding and replacing blown fuses can be inconvenient, dangerous, and frustrating.

Limitations Of Ceramic Fuses

While better than having no protection at all, ceramic fuses have inherent limitations, including:

Frequent Nuisance Tripping Disrupts Service

The sensitive fuse wires will blow with small overloads that likely wouldn’t damage wires. This leads to regular nuisance fuse blowing and power disruptions as needs increase.

Lack of Adjustability Causes Improper Protection

Ceramic fuses cannot be adjusted based on individual circuit requirements. Improperly rated fuses put circuits at risk.

Minimal Diagnostics Allow Faults to Go Undetected

When a fuse blows, it provides no diagnostics on the cause or origin of the issue. Problems with downstream wiring are not isolated.

Inability to Stop Electrical Fires and Arc Flashes

The melting fuse wire can spark fires and won’t stop dangerous arcs/heat levels like modern circuit breakers.

Costly Service Calls to Locate and Replace Each Blown Fuse

An electrician is required to find each blown fuse and install a replacement, resulting in added costs.

No Preventative Capabilities Allow Damage Before Acting

Ceramic fuses only respond after circuits are overloaded, leading to preventable damage. They cannot act preemptively.

Ceramic fuses made sense decades ago before better alternatives were available. But today, there are much safer and more intelligent circuit protection devices.

Benefits of Upgrading Circuit Protection

Modern circuit breakers and RCDs overcome nearly all the drawbacks of ceramic fuses. Unlike ceramic fuses, circuit breakers and RCDs are adjustable to provide precision protection on each individual circuit. They can be specifically sized and configured without nuisance tripping. Breakers and RCDs are also reusable devices. When tripped, they can be manually reset or will automatically reset themselves shortly after. There is no need to replace a part fully, like with blown fuses.


Additionally, circuit breakers and RCDs offer valuable diagnostic capabilities. A tripped breaker or RCD will indicate which specific circuit has experienced the issue. This allows for better isolation and pinpointing of any faults. Speaking of fault isolation, modern circuit breakers will trip power along the entire connected downline from the origin of the fault. This helps prevent damage from propagating and isolates risks.

In terms of fire and arc flash prevention, circuit breakers and RCDs are vastly superior to ceramic fuses. They can stop dangerous electrical arcs and extremely high heat levels before they reach ignition points. Advanced smart models even have predictive capabilities, monitoring for symptoms that could indicate emerging faults so that action can be taken proactively before an event happens. With their higher short circuit ratings, modern breakers and RCDs can also stop much larger power surges than a fuse could absorb.

Finally, resetting circuit breakers and RCDs is a quick and safe process that can be performed by building occupants, unlike blown fuses, which require electrician callouts for replacement.

Additional Safety Benefits

Beyond directly handling overload issues, upgrading circuit protection has many supplementary safety benefits:

  • Prevents the need to replace blown fuses, which can be risky urgently.
  • Reduces electrical fires and their poisonous fumes.
  • Stops power fluctuations that can damage sensitive electronics.
  • Eliminates fuse box tampering with makeshift fuses, which is extremely dangerous.
  • Lower risk of electric shocks with full isolation of faulted circuits.

Who Should Upgrade and When?


Homes and buildings that should consider upgrading from ceramic fuses include those with electrical fuse boards utilising old-fashioned, plug-in glass or ceramic fuses, typically found in properties over 50 years old. Another indicator is recurring nuisance fuse blowing even when loads are consistent. Fuses that trip without obvious overloads hint that your system needs an upgrade.

Additionally, frequent unexplained tripping of modern breakers or RCDs in the building points to outdated wiring that should be addressed. In these cases, upgrading from ceramic fuses can alleviate issues.

Ideally, any property still relying on old fuse systems should upgrade to modern electrical panels with circuit breakers or RCDs. While not inexpensive, the long-term benefits outweigh the upfront costs when considering the risks and damage prevented.

Many homeowners choose to upgrade when renovating or completing other electrical improvements. However, upgrades focused solely on safety are wise even without other electrical work. Electricians typically recommend upgrading switchboards approximately every 40 years as an important maintenance measure.

Replacing fuse systems with current, reliable circuit protection technology like breakers and RCDs provides substantial safety advantages and convenience and should be considered a priority.

What’s Involved in Upgrading?

Upgrading fuse boards requires:

  • An electrical contractor will assess your current system.
  • A new modern electrical panel will be installed, typically with residual current breakers with overload protection (RCBOs).
  • Your wiring will be connected circuit-by-circuit to the new panel.
  • The old switchboard will be removed once all circuits are transferred.
  • Expect 1-3 days of work depending on the building’s size and electrical complexity.

While not inexpensive, upgraded electrical safety almost always proves a wise investment, especially in older properties.

Take Control of Your Electrical Protection

If your home or building still relies on old and ceramic fuse boards, it’s time to keep your system up to date. Modern circuit breakers and RCDs overcome the limitations of outdated fuse technology to provide adjustable, reusable, and intelligent protection.

Upgrading to current standards delivers considerable safety benefits and prevents thousands in potential damage while saving you from frustrating fuse issues.

Contact Your Electrical Experts to discuss upgrading your circuit protection from ceramic fuses. Our licensed electricians have the experience to transition your switchboard smoothly to a modern breaker-based system.

The switch will provide long-lasting peace of mind, knowing your electrical system is fully protected with the latest technology. Don’t settle for outdated fuses – trust Your Electrical Experts to bring your switchboard into the 21st century!