High Immunity RCBOs for Noise-Prone Circuits
High immunity RCBOs are designed for circuits where standard protection may be more prone to nuisance tripping. They are commonly used on EV charger supplies, solar PV circuits, UPS equipment, heat pumps and other inverter-led loads where harmonics, leakage current or electrical noise can cause unwanted disconnections.
This range is focused on RCBOs for nuisance tripping prevention, not general Type A RCBO selection. For standard Type A devices, view our Type A RCBOs. Use this collection where circuit stability is the priority on sensitive or noise-prone installs.
Quick answer: A high immunity RCBO helps reduce unwanted tripping caused by leakage current, harmonics and transient electrical noise. It is typically used on inverter-led circuits such as EV chargers, solar PV, UPS systems and some renewable installs.
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High immunity RCBOs still provide combined residual current and overcurrent protection, but are built to improve circuit stability where standard RCBOs may trip too easily. This makes them useful for installers dealing with intermittent faults, sensitive equipment or repeated callouts caused by nuisance tripping.
- Reduced nuisance tripping – useful on circuits affected by leakage current or electrical noise
- Inverter-led circuit support – commonly used for EV, solar, UPS and heat pump loads
- Overload and earth leakage protection – RCBO protection in one device
- Bi-directional and switched neutral options – available on selected models
For related protection, browse our EV RCBOs, Type A RCBOs, Type B RCDs and surge protection devices.
High Immunity Type A Mini RCBO – 32A C Curve (WRB132C-030)
£11.85
The WRB132C-030 High Immunity Type A Mini RCBO is a 32A C Curve protective device engineered for circuits with higher inrush demands. Its slim 18mm design combines overload, short-circuit, and residual current protection in one module. With 30mA Type A sensitivity and a high-immunity build,...
A-Type RCBO EV Kit – 2 Way 40 A C Curve (WMEV240C)
£28.34
The WMEV240C is a 2-way A-Type RCBO EV Kit fitted with a 40 A C-curve high-immunity Type A RCBO. It provides combined overload, short-circuit and earth-leakage protection (30 mA AC + 6 mA DC) and meets the latest 18th Edition Amendment 2 requirements for EV...
High Immunity RCBO – 16A B Curve, Type A, 30mA (WER16B-030)
£19.80
The WER16B-030 is a 16A B Curve High Immunity Type A RCBO designed for solar PV, battery storage, and EV charger circuits. It provides combined overload, short-circuit, and 30mA residual current protection, with added resilience against nuisance tripping from harmonics or transient voltages. With double...
IP65 EV Consumer Unit – 40A C Curve RCBO + SPD
£56.90
The WMIP40CSP is a rugged IP65 EV consumer unit supplied with a 40A Type A RCBO (C Curve) and integrated Type 2 SPD. Built for EV charger installations that demand higher current handling and protection against inrush loads, it provides full overcurrent, residual current, and...
High Immunity Type A Mini RCBO – 25A C Curve (WRB125C-030)
£11.85
WRB125C-030 is a 25A C Curve high immunity Type A mini RCBO designed for circuits with higher inrush characteristics. It combines overload, short-circuit, and residual current protection in one compact device, making it suitable for domestic and commercial installations where board space is limited. As...
When to Use High Immunity RCBOs
A high immunity RCBO is best used where the circuit needs better resistance to unwanted tripping. This is common on installations with inverter-driven equipment, electronic loads or sensitive devices that can create leakage current, harmonics or transient disturbance.
They are especially useful when a standard RCBO keeps tripping without a clear hard fault, or where the installer wants to reduce the risk of nuisance tripping from the start.
High Immunity RCBOs vs Standard RCBOs
Both standard RCBOs and high immunity RCBOs provide combined overcurrent and residual current protection. The difference is circuit stability. High immunity models are designed to be more tolerant of electrical noise that can trigger unwanted trips.
| RCBO Type | Best Used For | Main Benefit |
|---|---|---|
| Standard RCBO | General domestic and commercial circuits | Combined earth leakage and overload protection |
| High immunity RCBO | EV, solar, UPS, heat pump and inverter-led circuits | Better resistance to nuisance tripping |
RCBOs for Nuisance Tripping
Nuisance tripping can be caused by cumulative leakage current, harmonics, transient surges or electronic equipment behaviour. On some circuits, replacing a standard device with a high immunity RCBO can help improve reliability while maintaining the required protection.
This can be useful on jobs where the customer reports intermittent tripping, especially where EV chargers, solar inverters, UPS units or other electronic loads are present.
High Immunity RCBO Applications
- EV charger circuits – useful where charger behaviour or circuit conditions cause unwanted trips
- Solar PV circuits – commonly used around inverter-led loads and leakage-sensitive installations
- UPS systems – helps maintain more stable protection on sensitive backup supplies
- Heat pump circuits – useful where inverter-driven equipment affects circuit behaviour
- Commercial boards – suited to circuits with multiple electronic loads or noisy equipment
High Immunity, Surge Protection and Inverter Circuits
High immunity RCBOs help reduce unwanted trips, but they do not replace surge protection. Where transient overvoltage is also a concern, use suitable surge protection devices alongside the correct RCBO selection.
For EV and renewable installations, you may also need to consider Type B RCDs, EV RCBOs, heat pump consumer units or solar combiner boxes, depending on the circuit design.
High Immunity RCBO FAQs
What is a high immunity RCBO?
A high immunity RCBO is an RCBO designed to reduce unwanted tripping caused by leakage current, harmonics and electrical noise while still providing residual current and overcurrent protection.
When should I use a high immunity RCBO?
Use one where nuisance tripping is a known issue or where the circuit includes inverter-led equipment such as EV chargers, solar inverters, UPS units or heat pumps.
Are high immunity RCBOs the same as standard Type A RCBOs?
No. Many high immunity RCBOs are Type A devices, but this range is specifically focused on improved tripping stability for noise-prone circuits. For general Type A RCBOs, use the dedicated Type A RCBO category.
Can a high immunity RCBO stop intermittent tripping?
It can help where the tripping is caused by leakage current, harmonics or electrical noise. It will not solve a genuine wiring fault, overload or equipment fault.
Are high immunity RCBOs suitable for solar PV?
They can be suitable for some solar PV circuits, especially where inverter behaviour or leakage current may cause nuisance tripping. Always check the inverter manufacturer’s requirements.
Do high immunity RCBOs replace surge protection?
No. High immunity RCBOs and surge protection devices solve different issues. RCBOs provide residual current and overcurrent protection, while SPDs protect against transient overvoltage.
UK-Stocked High Immunity RCBOs
Power & Data UK supplies high immunity RCBOs for EV, solar, UPS, heat pump and commercial circuits where nuisance tripping needs to be reduced. Products are UK-stocked, with free UK mainland next-day delivery available on orders over £30 when placed before 2pm.
For related options, view our EV RCBOs, Type A RCBOs, Type B RCDs and surge protection devices.