A safety switch, also called a residual current device (RCD), is one of the most important pieces of electrical safety equipment in your home. It constantly monitors the flow of electricity through a circuit, and if it detects current leaking somewhere it shouldn't, such as through a person, it can cut power in as little as 0.03 seconds.
Without a safety switch, an electrical fault can take much longer to be detected, often not until a fuse blows or something is visibly wrong. A safety switch reacts almost instantly, which is the difference between a minor scare and a serious injury.
Ideally, every circuit in the home is protected: lighting, power, and any fixed appliances. Many older homes only have one safety switch covering a handful of circuits, which means a fault on one circuit can cut power to several rooms at once.
If you own a rental property, safety switches aren't just good practice. They're part of your obligations as a landlord under Australian electrical safety regulations. Getting a compliance check done regularly helps protect tenants and keeps you covered.
A licensed electrician can test your existing safety switches, confirm which circuits are covered, and recommend any upgrades needed to bring your switchboard up to current standards.