Type A RCBO – 25A B Curve, 30mA
18th Ed. Compliant
2-Year Warranty
UK Stock
Free Delivery £30+
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The WRT125B-030 is a 25A B Curve Type A RCBO combining residual current and overcurrent protection in one slim device. It features switched live and neutral disconnection for safe isolation, high immunity electronics to reduce nuisance trips, and bi-directional wiring suitable for solar PV, EV chargers, and inverter-fed systems. Tested...
The WRT125B-030 is a 25A B Curve Type A RCBO combining residual current and overcurrent protection in one slim device. It features switched live and neutral disconnection for safe isolation, high immunity electronics to reduce nuisance trips, and bi-directional wiring suitable for solar PV, EV chargers, and inverter-fed systems.
Tested to IEC/EN 61009-1, this RCBO meets the 18th Edition Wiring Regulations (Amendment 2) and fits directly into standard 18mm DIN rail consumer units, making it a reliable choice for both domestic and light commercial installs.
Installer Tip: The B Curve is best for socket circuits and domestic loads with low inrush current. For motors, EV chargers, or circuits with higher start-up loads, select the C Curve version.
Key Features
- 25A B Curve Type A RCBO – overload and 30mA residual protection
- Switched live & neutral – isolates both conductors
- High immunity design – resists false trips in noisy environments
- Bi-directional wiring – inverter and solar compatible
- Compact 18mm module – saves space in consumer units
- 10kA breaking capacity – robust for domestic & light commercial boards
- Conforms to IEC/EN 61009-1
Compare WRT Range
| Model | Rating | Curve | Application |
|---|---|---|---|
| WRT120B-030 | 20A | B Curve | Domestic / Light Commercial |
| WRT125B-030 (This Product) | 25A | B Curve | Higher Load Circuits |
| WRT125C-030 | 25A | C Curve | Motors / EV / Heat Pumps |
| WRT132B-030 | 32A | B Curve | General Loads / Consumer Units |
When should I use a 25A RCBO?
It’s best for higher demand domestic or light commercial circuits needing 25A overload protection plus earth leakage safety.
What’s the benefit of Type A over AC?
Type A RCBOs detect pulsating DC leakage as well as AC faults – essential for EV chargers, solar inverters, and modern electronics.
Does it disconnect both poles?
Yes – switched live and neutral provide complete isolation when tripped or switched off.
Why high immunity?
High immunity reduces nuisance trips caused by harmonics and transients in inverter-heavy circuits.
- Type: A (detects AC + pulsating DC leakage)
- Rating: 25A
- Trip Curve: B
- Sensitivity: 30mA
- Breaking Capacity: 10kA
- Poles: 1P+N (switched live & neutral)
- Voltage: 230V AC
- Impulse Withstand: 4kV
- Electrical Life: 2,000 operations
- Mechanical Life: 10,000 operations
- Protection: IP20
- Terminal Capacity: Top 10mm² / Bottom 16mm²
- Dimensions: W17.8 × H116 × D76mm
- SKU: WRT125B-030
- Standards: IEC/EN 61009-1
Designed for 25A circuits in domestic and light commercial installs. Provides overload, short-circuit, and 30mA earth leakage protection in a single device.
- DIN rail mount – single module width
- Ensure rating matches load demand
- Bi-directional wiring simplifies installation
- Must be installed by a qualified electrician
