Safety switches and surge protection are not alternatives. A safety switch detects residual current, while a surge protection device is intended to limit certain transient overvoltages. Whether surge protection is worthwhile depends on the installation, exposure and equipment you want to protect—not simply whether safety switches are already fitted.
To assess the board, earthing and connected equipment together, see GMB’s switchboard surge protection service.
What a surge protection device is designed to do
A transient voltage spike can arise from events such as network switching or lightning-related disturbances. Sensitive electronic controls, computers and appliances may be affected. A suitably selected surge protection device can limit some of these transients and divert surge current through its designed protective path.
This is different from the earth-leakage condition detected by an RCD and from an overload detected by a circuit breaker. A surge device therefore does not remove the need for appropriate RCD and overcurrent protection.
Board protection and point-of-use protection
A board-mounted device can provide a coordinated protective layer for the installation. Point-of-use protection may add a further layer for particular equipment when selected and used appropriately. A power board with extra sockets is not necessarily a surge protector, and a surge protector is not necessarily a battery backup.
Protection needs to be considered as a system. Earthing, device selection, installation arrangement and the equipment manufacturer’s requirements matter. Equipment connected to communications or other external services may have additional paths for disturbances that a power-only solution does not address.
Know the limitations before buying
No device guarantees that equipment will survive every surge or a direct lightning event. Surge protection also does not solve routine power outages, all sustained supply-voltage problems or existing appliance faults. If your concern is losing work during an outage, backup power is a separate discussion.
Devices can have status indicators or replacement requirements. Ask the electrician how the installed device’s condition is checked and what action to take if its indicator changes. Do not open a switchboard to inspect or replace a device yourself.
Build a practical equipment list
Identify equipment whose loss would be especially disruptive: a home office computer, refrigeration controls, access systems or production electronics. Include existing surge accessories and any history of disturbances. An electrician can then explain what protection is realistic and what remains outside the proposal.
For a Sydney household adding expensive appliances, combining this review with planned board work can help coordinate the layout. For a business, ask who will monitor device condition and whether repair records and maintenance checks need updating.