A Type Mini RCBO & Single Module 6A-40A B Curve 30mA High Immunity
18th Ed. Compliant
2-Year Warranty
UK Stock
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The WRB1 range of High Immunity Type A RCBOs delivers full overload and residual protection in a true 1-module width design – saving space while maintaining full compliance with modern circuit protection standards. These compact breakers feature switched live and neutral, Type A RCD sensitivity, and bi-directional wiring for inverter-fed...
The WRB1 range of High Immunity Type A RCBOs delivers full overload and residual protection in a true 1-module width design – saving space while maintaining full compliance with modern circuit protection standards. These compact breakers feature switched live and neutral, Type A RCD sensitivity, and bi-directional wiring for inverter-fed systems.
Ideal for EV charger circuits, solar PV systems with surge protection, heat pumps, and battery installs – these RCBOs are built to handle AC and pulsating DC faults, all while resisting nuisance tripping caused by harmonics or transient voltages.
Available Variants:
- WRB106B: 6A – Curve B
- WRB110B: 10A – Curve B
- WRB116B: 16A – Curve B
- WRB120B: 20A – Curve B
- WRB125B: 25A – Curve B
- WRB132B: 32A – Curve B
- WRB140B: 40A – Curve B
Also available in Curve C – see alternate listing or get in touch for details.
Key Features:
- Single module RCBO with full 1P+N protection
- Type A RCD – detects AC and pulsating DC faults
- Bi-directional wiring – install line/load either way
- Switched live and neutral – full circuit isolation
- High immunity design – reduces nuisance tripping
- Suitable for EV chargers, solar PV with SPD, battery and inverter-based systems
What is a Type A RCBO?
A Type A RCBO detects both AC and pulsating DC leakage, while also protecting against overloads and short circuits. This makes them suitable for most modern loads, including EV chargers and inverters.
What does ‘bi-directional’ mean?
Bi-directional RCBOs can be installed with line/load on either terminal. This is especially useful in solar and battery setups where current may reverse.
How much space does this take in the board?
Just 1 module – 18mm width. Ideal for tight domestic or retrofit installs. For larger installs, see our 4-pole high immunity RCBO.
Do I need to disconnect cables to test insulation resistance?
No – the WRB1 range features switched neutral, so insulation testing can be done without removing conductors.
Is this suitable for EV charger circuits?
Yes – these RCBOs meet Type A requirements and are ideal for EV installs. If your charger requires DC-sensitive protection, use a Type B RCD or choose a pre-wired EV board with RCBO + SPD.
Do I need surge protection with this RCBO?
Yes – under BS 7671, SPDs are strongly recommended for EV, solar, and renewable systems. Options include single-module SPDs or consumer units with integrated surge protection.
- Type: A (AC + pulsating DC detection)
- Poles: 1P+N with switched neutral
- Current Ratings: 6A–40A (variant dependent)
- Sensitivity: 30mA
- Breaking Capacity: 6kA
- Trip Curve: B (Curve C available on request)
- Mounting: DIN rail (1 module width)
- Voltage: 230V
- IP Rating: IP20 (indoor use)
- Dimensions: 18mm (W) × 90mm (H) × 77mm (D)
- Conformity: BS EN 61009-1 / IEC 61009-1
- Bi-directional: Yes (line/load reversible)
Install this RCBO as part of a compliant consumer unit to provide combined overload and residual protection. The bi-directional design means line and load can be wired either way, simplifying install on inverter-fed or backfeed-prone systems.
- No need to disconnect for insulation resistance testing
- Use with DIN rail systems (35mm standard)
- Check MCB curve suitability for inrush loads (B vs C)
- Torque terminals to 2.5Nm for secure connections
