How and when to test your safety switches

Energy Safe Victoria says a safety switch always has a test button and ‘30mA’ printed on it. Circuit breakers have no test button, and neither do the ceramic fuses still found in some older boards. Look at the fronts of the devices behind the switchboard’s hinged door. Never unscrew or lift off a panel to see more.

One safety switch often covers a group of circuits, so a single button might drop the power points in half the house. The regulator also notes that safety switches may not protect all wiring and appliances, so one or two on the board doesn’t mean everything is covered.

Melbourne’s west has the whole range. A post-war brick or weatherboard house in Altona or Laverton might still have a fuse board with no safety switch, or a later board with one or two added along the way. Energy Safe Victoria lists old switchboards without a safety switch as a warning sign, and suggests a registered electrical contractor if you’re unsure whether one is fitted.

Energy Safe Victoria’s Test. Reset. Protect. page asks householders to check their safety switches every three months. Its how-to video says to check them regularly, every year, and that this applies to tenants as much as owners. Aim for the three-monthly routine. If a whole year slips by, you’re behind on both counts.

The hard part is remembering. Tie it to the change of season, or to the smoke alarms. Fire Rescue Victoria says to test smoke alarm batteries every month, so every third alarm check can take in the switchboard too.

A safety switch can sit untouched for months. The button is the only way a householder can find out it has stopped working before the day it’s needed.

Pick a time when a short power cut won’t cause grief. Tell everyone in the house, save anything open on a computer, and plan around anything that shouldn’t lose power, such as home medical equipment. If the board is in an outside meter box, wait for a dry day.

Energy Safe Victoria says pressing the test button should cut the power and trip the switch to off, and you may hear a clunk. Check the light you left on has gone out, push the lever back up, then move to the next switch. Afterwards, reset the oven clock, the garage door, the modem and any garden timers.

The test button creates a small, deliberate imbalance inside the device through a built-in resistor. If the switch trips, its sensing and its mechanism work. That’s worth knowing, and it’s all the button can tell you.

It can’t tell you how fast the switch acted. Energy Safe Victoria describes a safety switch as turning the power off within 0.03 of a second, and nobody can judge that by ear. Nor can the button show how much leakage it took to trip, or whether every circuit you assume is protected really runs through it.

So a pass on the button is good news, not a clean bill of health. A switch that clunks off on the button but responds slowly to a real fault is exactly the problem a homeowner can’t spot.

A trip-time test uses an RCD tester. The electrician connects it at a power point or at the board; it leaks a measured current to earth and times how long the switch takes to cut out. Testers check at the switch’s rated current and above it, and can ramp the current up to find where the device actually trips.

The electrician should also map each device: which circuits it covers, which aren’t covered at all, and whether the labels match. The type matters too. Energy Safe Victoria says Type AC safety switches must not be installed in Australia, even as like-for-like replacements, though existing ones installed, tested and certified before 1 May 2023 don’t have to be replaced. You should end up with a written result for every switch. It’s worth booking one when any of these apply.

If you press the button and the power stays on, Energy Safe Victoria says the switch may have failed and you should call a licensed electrician immediately to investigate. Until it’s checked, treat those circuits as unprotected: hold off on outdoor power tools, spa or pool gear and anything used near water.

If the switch trips but won’t go back on, the cause is often a fault on one of its circuits or an appliance rather than the switch. The official advice is short: if it won’t reset, call a licensed electrician. Try once, then leave it off. Our guide to a safety switch that keeps tripping covers what to note down.

Don’t tape a switch on, bridge it or swap it yourself. Energy Safe Victoria says electrical work isn’t a DIY job, even a small one. Replacing a safety switch counts as electrical installation work, so the licensed electrician must give you a Certificate of Electrical Safety.

A tingle or shock from an appliance or tap is more serious. Stop using it, keep others away from it and have a licensed electrician check the wiring. If there's smoke or fire, get everyone out.

Renters can press the test buttons too. If a switch fails, tell the rental provider or agent in writing and keep a copy. Consumer Affairs Victoria lists a dangerous electrical fault as an urgent repair, and the rental provider must organise and pay for repairs that aren’t the renter’s fault.

For rental providers, the button is only the start. Since 29 March 2023, power outlets and lighting circuits in a Victorian rental must connect to a switchboard-type circuit breaker and a switchboard-type residual current device. Providers who entered a new agreement after 29 March 2021 must have all electrical installations and fittings checked by a licensed electrician at least once every 2 years. Consumer Affairs Victoria lists a change that extends two-yearly gas and electrical checks to all rental agreements, whether they started before, on or after 13 October 2026.

Energy Safe Victoria says that check must follow section 4 of AS/NZS 3019:2022. When you book it, ask what the report will record for each safety switch.

Plenty of households never need more than the button and a notebook. Total Comfort is useful for the next step: a switch that failed its test or won’t reset, a board with no test buttons, or a house that has never had an instrument test.

Our electricians trip-time test each device, map what it protects and put the results in writing, with honest advice on what needs doing now and what can wait. If something needs replacing, you get the price before we start. We’re a family-run licensed electrical contractor (REC 38187), based in Altona Meadows and working across Melbourne’s west.