RCBOs – Single & Three Phase
RCBOs (Residual Current Breaker with Overload) combine the functions of an RCD and MCB in a single device – protecting against both overloads and earth leakage faults. We stock Type A RCBOs, Type B DC-sensitive RCBOs, and High Immunity RCBOs in a wide range of ratings and configurations, with next-day UK delivery available.
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Available in single and three-phase options, our RCBOs are suitable for domestic, commercial, and industrial installations. They’re particularly recommended for EV chargers, heat pumps, and renewable energy systems, where sensitive inverter-driven loads demand advanced protection.
- Type A RCBOs – standard for most UK domestic installs
- Type B RCBOs – DC-sensitive, required for EVs, solar, and heat pumps
- High Immunity RCBOs – reduce nuisance tripping in noisy circuits
- Single & Three Phase RCBOs – cover all circuit types and loads
All RCBOs are BS EN 61009 compliant, backed by a 2-year warranty, and shipped from our UK warehouse. See our returns policy for easy returns.
High Immunity RCBO – 20A B Curve, Type A, 30mA
£18.67
The WER20B-030 is a 20A B Curve High Immunity Type A RCBO designed for residential and light commercial circuits including solar PV, battery storage, and EV-ready boards. It combines overload, short-circuit, and 30mA residual current protection in one device, while its high immunity design helps...
High Immunity Type A 4 Pole RCBO – ADR432C
£37.14
The ADR432C High Immunity Type A 4 Pole RCBO is a 32A protective device designed for three-phase circuits where both AC and smooth DC leakage currents may occur. With 30mA residual current protection and 6mA DC detection, it’s ideal for EV charger installations, heat pump...
Type A RCBO – 32A B Curve, 30mA
£12.50
The WRT132B-030 is a 32A B Curve Type A RCBO that delivers overcurrent and 30mA residual current protection in one slimline device. It features switched live and neutral isolation for safe disconnection, a high immunity design to reduce nuisance trips, and bi-directional wiring that makes...
High Immunity RCBO – 40A C Curve, Type A, 30mA
£18.67
The WER40C-030 is a 40A C Curve High Immunity Type A RCBO designed for EV chargers, motors, heat pumps, and commercial inverter-fed systems. It combines overload, short-circuit, and 30mA residual current protection in a single device, with high immunity electronics to resist nuisance tripping from...
Type A RCBO – 6A C Curve, 30mA
£12.50
The WRT106C-030 is a 6A C Curve Type A RCBO combining residual current and overcurrent protection in one compact device. With switched live and neutral disconnection for full isolation, bi-directional wiring for use in solar PV and inverter-fed systems, and high immunity electronics to reduce...
What Is an RCBO?
An RCBO (Residual Current Breaker with Overload) combines the protection of an RCD and MCB in one compact device. It trips when a circuit is overloaded, short-circuited, or when leakage current is detected – offering the highest level of circuit safety.
Types of RCBOs
- Type A – detects AC and pulsed DC faults; the UK standard for most new installations. Example: A-Type RCBO available in multiple ratings.
- Type B – provides protection against smooth DC faults, required for EV chargers, solar PV inverters, and heat pumps. See our 4-Pole RCBO for three-phase renewables.
- High Immunity – designed for circuits with electrical noise (common in industrial or renewable setups), reducing false tripping. Popular choice: 1-Module High Immunity RCBO.
Single vs Three Phase RCBOs
We supply both single-pole RCBOs for domestic circuits and three-phase RCBOs for commercial and industrial boards. Three-phase RCBOs are used in distribution panels where individual circuit protection is required across multiple phases.
Applications
- EV charging – ensures compliance with BS 7671 and manufacturer requirements.
- Heat pumps – protects sensitive inverter-driven equipment against leakage and overload.
- Solar PV & battery storage – covers DC leakage risks from renewable systems.
- Board upgrades – modernises older RCD/MCB setups with individual RCBO protection.
FAQs on RCBOs
What’s the difference between an RCD and an RCBO?
An RCD protects against earth leakage only, while an RCBO adds overload and short-circuit protection – combining both in one device.
Do I need a Type B RCBO?
If you’re installing EV chargers, heat pumps, or solar inverters, yes. Type B devices detect smooth DC currents which Type A devices may miss.
Why use RCBOs instead of a split-load RCD board?
RCBOs give each circuit its own protection. This avoids nuisance tripping that can cut power to multiple circuits at once, making them the preferred option for new builds.
Why Buy From Power & Data UK?
All RCBOs are UK stocked, BS EN compliant, and supplied with a 2-year warranty. Orders over £30 qualify for free next-day delivery, with Saturday delivery upgrades available. For returns, see our policy here.