Rcd

Residual Current Devices (RCDs) are essential circuit protection components that detect earth leakage currents and disconnect power within milliseconds to prevent electric shock and fire hazards. At iSupply Electrical, we stock a comprehensive range of RCDs suitable for residential, commercial, and industrial installations across Australia.

Our RCD selection includes single-phase and three-phase units, combination RCBO devices, and portable RCD adaptors to meet diverse project requirements. All products comply with Australian standards AS/NZS 61008 and AS/NZS 3190, ensuring safe installation and reliable performance.

Whether you’re wiring new residential developments, upgrading commercial properties to current safety standards, or maintaining industrial facilities, our RCD range delivers the circuit protection your projects demand. Licensed electricians benefit from competitive wholesale pricing, technical specifications for each product, and fast delivery across all Australian states.

Browse our RCD collection to find Type A, Type AC, and Type B devices with various current ratings and sensitivity levels, alongside related circuit protection components including MCBs, distribution boards, and surge protection devices.

---

FAQs

What is the difference between Type AC and Type A RCDs?

Type AC RCDs detect standard AC residual currents, while Type A RCDs also detect pulsating DC residual currents common in modern appliances with electronic controls. Type A RCDs are increasingly recommended for installations with heat pumps, EV chargers, solar inverters, and variable speed drives.

Are RCDs mandatory in Australian electrical installations?

Yes, Australian standard AS/NZS 3000 requires RCD protection for socket outlets and lighting circuits in domestic and commercial installations. All final sub-circuits supplying socket outlets rated up to 20A must be RCD protected.

What current rating should I choose for an RCD?

RCD current ratings should match or exceed the circuit’s protective device. Common ratings include 25A, 32A, 40A, and 63A. The residual current sensitivity (typically 30mA for general use) determines how quickly the device trips when detecting earth leakage.

Can I use RCDs with solar PV systems?

Yes, but solar installations require Type A or Type B RCDs capable of detecting DC fault currents. Standard Type AC RCDs may not trip correctly with inverter-generated DC residual currents, creating safety risks.

What’s the difference between an RCD and an RCBO?

An RCD provides earth leakage protection only, while an RCBO (Residual Current Breaker with Overcurrent protection) combines RCD functionality with MCB overcurrent protection in a single device, saving switchboard space and simplifying circuit protection.

How often should RCDs be tested?

Manufacturers recommend testing RCDs quarterly using the built-in test button. Licensed electricians should conduct comprehensive testing during electrical safety inspections using calibrated RCD testers to verify correct operation and tripping times.