Switchboards13 October 2026

Ceramic Fuses, Circuit Breakers and Safety Switches: What Changes in a Switchboard Upgrade

Modern protection is not just an old fuse replaced with a new-looking switch. Overcurrent protection and shock-risk protection have different jobs.

Older electrical panel fitted with fuses, meters and control equipment

Illustrative stock photograph; not a Smart Meter Australia installation.

Australian Owned & Operated

NSW Level 2 ASP

Licensed Electricians

Fully Insured

AS/NZS 3000 Compliant Work

Ausgrid Service Area

Endeavour Energy Service Area

Essential Energy Service Area

Residential, Commercial and Strata

Work completed in accordance with applicable NSW network, metering and electrical requirements.

Fuses and breakers protect against overcurrent

A fuse is designed to interrupt its circuit when excessive current causes its element to operate. A circuit breaker provides overcurrent protection with a mechanism that can be reset after the cause is addressed. Both are selected to protect the circuit and wiring; neither should be described as a complete substitute for a safety switch.

An older ceramic fuse board warrants professional assessment, but its appearance alone does not tell you the condition of every circuit. Repeated fuse operation or breaker tripping is a symptom to investigate, not a reason to install a larger rating. Do not replace fuse wire, bypass protection or keep resetting a device to overcome a fault.

An RCD has a different protective function

A residual current device, commonly called an RCD or safety switch, detects an imbalance in current and disconnects the protected circuit when that imbalance reaches its operating conditions. It is intended to reduce the risk of severe electric shock in the situations it detects. It cannot remove every electrical risk or replace safe equipment and sound wiring.

Some devices combine residual-current and overcurrent protection in one unit, often called an RCBO. That is why a modern board can have devices that look similar but provide different functions. NSW Government advice distinguishes safety switches protecting people from circuit breakers protecting wiring and recommends consulting a licensed electrician about circuit coverage.

A board upgrade is also a condition assessment

Our switchboard upgrade assessment service reviews protection, available space, the panel and relevant metering requirements. The electrician must assess the actual installation and applicable standards, rather than copy a generic list of devices onto every board.

Existing circuits may need testing or fault rectification before new protection can be commissioned. An RCD operating after an upgrade can reveal a pre-existing fault or arrangement that needs investigation. New devices do not repair deteriorated insulation, loose connections or unsuitable circuit wiring by themselves.

Ask what the quote covers

Which circuits are being assessed and what protection is proposed for each?
Is the enclosure or panel being replaced, and is suspected asbestos part of the planning?
What testing and existing-circuit rectification are included or excluded?
What interruption, labelling and compliance-document handover are planned?

Understand the board at handover

Ask the electrician to identify the protected circuits, explain the device labels and provide the applicable Certificate of Compliance Electrical Work. Keep the circuit schedule and instructions for routine testing with the property records. Do not open internal covers to work out which cable supplies an appliance.

Follow the electrician’s and manufacturer’s instructions for accessible safety-switch checks only when it is safe to do so. A switch that fails to operate, will not reset or repeatedly trips needs a licensed electrician’s investigation. Where there is heat, smoke, sparking or exposed wiring, keep away and seek urgent assistance rather than carrying out a routine check.

COMMON QUESTIONS

Is a circuit breaker the same as a safety switch?

No. Overcurrent protection and residual-current protection have different functions. Some RCBO devices combine both, so ask the electrician to explain your actual board.

Does a new board make all old wiring safe?

No. Existing wiring and circuits need assessment and testing. Faults or deterioration may require separate rectification.

Can I stop nuisance tripping with a larger breaker?

Do not change protection ratings or bypass devices. Tripping needs investigation by a licensed electrician; the rating must suit the circuit and applicable requirements.

RELATED SERVICES

Switchboard Upgrades

Full compliance upgrades to ensure your switchboard meets current network standards.

Learn More

Understand the protection your board needs

Arrange a condition and protection assessment, with a clear scope for the board and existing circuits.

Explore switchboard upgrades

NEED THIS SORTED?

Level 2 ASP accredited on Ausgrid, Endeavour Energy and Essential Energy. Free quotes, honest advice.

CALL 0466 125 125