High Immunity RCBOs (Type A) for EV, Solar & Noise-Prone Circuits
High Immunity RCBOs are designed to prevent false tripping caused by harmonics, surges, or DC leakage – issues common in EV chargers, solar PV systems, UPS/three-phase setups, and noisy commercial circuits. In practice, “high immunity” refers to enhanced filtering that prevents nuisance tripping caused by harmonics, transient surges, and DC bleed from modern electrical equipment.
Quick answer: A high immunity RCBO is a Type A residual current breaker designed to resist nuisance tripping caused by electrical noise, harmonics, and DC leakage from equipment such as EV chargers, solar inverters, and UPS systems.
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These advanced Type A RCBOs provide full overload and earth leakage protection while filtering out interference that would cause nuisance trips in standard devices. Many models include switched neutrals, twin-action handles, and bi-directional operation for safer, easier installation.
- High immunity design – resists unwanted trips from electrical noise
- Type A protection – detects AC and pulsed DC leakage
- Single, 2-pole & 4-pole options – suited to domestic and commercial boards
- 18th Edition Amendment 2 compliant – trusted for modern installs
Need surge suppression alongside high immunity? Explore our Surge Protection Devices. For shipping details, see our delivery information or returns policy.
High Immunity Type A Mini RCBO – 16A C Curve (WRB116C-030)
£11.67
The WRB116C-030 High Immunity Type A Mini RCBO is a 16A C Curve device designed to protect circuits with higher inrush currents. At just 18mm wide, it combines residual current and overcurrent protection in one compact module. With 30mA Type A sensitivity and a high-immunity...
High Immunity Type A Mini RCBO – 25A C Curve (WRB125C-030)
£11.67
The WRB125C-030 High Immunity Type A Mini RCBO is a 25A C Curve protective device designed for circuits with motors, pumps, and appliances that generate higher inrush currents. Its compact 18mm design combines overload, short-circuit, and residual current protection in a single unit. With 30mA...
High Immunity Type A Mini RCBO – 40A B Curve (WRB140B-030)
£11.67
The WRB140B-030 High Immunity Type A Mini RCBO is a 40A B Curve protective device for residential and commercial circuits requiring higher current handling. At just 18mm wide, it combines overload, short-circuit, and residual current protection in a single compact module. With 30mA Type A...
3 Phase Surge Protection Device Unit with 8 Way Metal IP40 enclosure 40A RCBO
£89.20
Pre-wired in the UK and tested before dispatch – allow up to 3 working days for shipping. The WRCUSP440C is a ready-to-fit 3-Phase Surge Protection Device (SPD) Unit supplied in an 8-way IP40 steel enclosure. It includes a 4-pole Type 2 SPD (20kA/40kA) paired with...
8 Way IP65 Enclosure – 32A B Curve Type A RCBO + Surge Protection (WPRC32BSP/8)
£43.35
The WPRC32BSP/8 is an 8 way IP65 plastic enclosure fitted with a 32A B Curve Type A RCBO and integrated Type 2 Surge Protection Device (SPD). Designed for EV charge points, outdoor distribution circuits, and renewable installs, it provides overload, short-circuit, earth leakage, and surge...
Why Choose High Immunity RCBOs?
Standard RCBOs can trip unnecessarily in environments with high electrical noise – wasting time on callouts and frustrating clients. High Immunity RCBOs are built to avoid this problem, maintaining reliable protection without nuisance disconnections.
Applications
- EV chargers – prevents false tripping from inverter harmonics. A proven option is the A-Type RCBO EV Kit (40A B-Curve).
- Solar PV systems – avoids disruption from DC leakage or backfeed. Many installers use the Single Module High Immunity A-Type RCBO.
- Battery storage & UPS – stable protection for sensitive systems.
- Commercial & industrial boards – reliable operation in noisy electrical environments. For larger setups, see the High Immunity 4-Pole A-Type RCBO.
Key Features
- Resists nuisance tripping – filters out harmonics and DC bleed
- Type A detection – protects against AC and pulsed DC faults
- Bi-directional operation – can be installed either way up
- Switched neutral options – safer isolation and clearer fault indication
FAQs on High Immunity RCBOs
What causes nuisance tripping?
Inverter-driven equipment like EV chargers and solar systems can create harmonics or DC leakage that cause standard RCBOs to trip unnecessarily. High Immunity RCBOs are designed to filter this out.
Are High Immunity RCBOs mandatory?
They are not mandatory under the 18th Edition, but are strongly recommended for circuits with renewables, EVs, or UPS systems where false trips are common.
What’s the difference between a standard Type A RCBO and a High Immunity RCBO?
A High Immunity RCBO uses enhanced filtering to avoid false trips from electrical noise, while a standard Type A RCBO may trip more easily on circuits with inverters or harmonics.
Do High Immunity RCBOs still meet regulations?
Yes – they fully comply with BS EN 61009 and 18th Edition Amendment 2 wiring regulations.
Why Buy From Power & Data UK?
We stock UK-certified High Immunity RCBOs, available with next-day delivery and backed by a 2-year manufacturer warranty. If you need to return an item, see our returns policy. All products are tested and labelled for fast, reliable installation.