You’ve probably seen the term RCD on your switchboard or heard your electrician mention it during a safety inspection, but what exactly does it mean, and why is it so important for your home? In simple terms, an RCD (Residual Current Device) is one of the most vital pieces of safety equipment in your electrical system. It’s designed to save lives by cutting the power instantly if it detects a fault.
What Exactly Is an RCD?
An RCD is a safety switch that constantly monitors the flow of electricity in your circuits. If it detects that power is leaking from the circuit, for example, through a faulty appliance, damaged wiring, or a person, it immediately cuts the supply to prevent electric shock or electrocution.It’s fast too, an RCD can trip within 30 milliseconds, fast enough to save a life.
RCD vs Circuit Breaker — What’s the Difference?
It’s easy to confuse RCDs with circuit breakers, but they’re not the same thing:
- Circuit breakers protect your wiring and appliances from overloads and short circuits.
- RCDs protect people by cutting power when electrical current flows somewhere it shouldn’t.
Why Every Home Needs RCD Protection
In Queensland, all new homes and many older homes that have been upgraded are legally required to have RCD protection installed.
Here’s why:
- Life-saving protection — prevents electric shock and electrocution.
- Fire prevention — stops current leakage that can lead to overheating.
- Compliance with Queensland electrical safety regulations.
- Peace of mind — knowing your family and property are protected.
If your home still has an old fuse box or outdated switchboard without RCDs, it’s time for an upgrade.
How to Check if You Have RCDs Installed
Take a look at your switchboard, RCDs are usually labelled as “Safety Switches” and will have a ‘TEST’ button. Pressing this button should trip the switch, cutting power to that circuit. If it doesn’t trip, or you’re unsure whether you have proper RCD protection, call a licensed electrician for an inspection.
When to Upgrade Your Switchboard
If your home is more than 20 years old or still uses ceramic fuses, it’s likely time for a switchboard upgrade. Modern switchboards include:
- Multiple RCDs and circuit breakers
- Clear labelling for each circuit
- Better fire resistance and safer wiring
Upgrading ensures your electrical system can safely handle today’s higher power demands, air conditioners, EV chargers, kitchen appliances, and more.
Regular RCD Testing Is Essential
Even the best RCD won’t protect you if it’s faulty. That’s why it’s important to test each RCD every three months using the built-in TEST button, and have them professionally tested every 12 months.
RCDs are small devices that make a massive difference to your safety. If you’re not sure whether your home is properly protected, don’t leave it to chance. Get in touch with Boiso’s Electrical Services today for an RCD inspection or switchboard upgrade across Emerald and the Central Highlands.





