Single Module 2 Pole RCBO 20A B Curve WRN20B-030
18th Ed. Compliant
2-Year Warranty
UK Stock
Free Delivery £30+
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The WRN20B-030 is a 20A Type A RCBO in a single-module, 2-pole design — providing both residual current (RCD) and overcurrent (MCB) protection in one compact device. It detects AC and pulsating DC leakage currents, making it suitable for modern domestic and commercial installations. With a built-in switched neutral, this...
The WRN20B-030 is a 20A Type A RCBO in a single-module, 2-pole design — providing both residual current (RCD) and overcurrent (MCB) protection in one compact device. It detects AC and pulsating DC leakage currents, making it suitable for modern domestic and commercial installations. With a built-in switched neutral, this RCBO ensures full circuit isolation on fault while keeping healthy circuits in service.
Installer Tip: For socket circuits and small appliance loads, a 20A B-Curve RCBO is often the most efficient choice. The WRN20B-030 covers both overload and residual current protection in one unit.
- 20A B-Curve RCBO: Ideal for socket outlets, small power circuits, and domestic loads
- Type A protection: Trips on AC and pulsating DC leakage
- Compact: Single 18mm module width
- 2-pole switched neutral: Ensures complete disconnection on fault
- Minimises disruption: Only the faulty circuit is isolated
- BS 7671 compliant: Meets 18th Edition Amendment 2 standards
What is this RCBO used for?
The WRN20B-030 is suited to socket and small appliance circuits where 20A load capacity is needed, with protection against both overload and residual current faults.
Does it include switched neutral protection?
Yes — both live and neutral conductors are disconnected during a fault, ensuring safer isolation and compliance with current UK wiring standards.
Is this RCBO compliant with the 18th Edition?
Yes, it meets BS EN 61009-1 and BS 7671 requirements, suitable for domestic and commercial installs under Amendment 2.
When should I choose a C-curve instead of this B-curve?
Pick the WRN20C-030 C Curve RCBO if the circuit includes motors, compressors, or other equipment with high inrush currents.
Other WRN Options
| SKU | WRN20B-030 |
| Device Type | Type A RCBO |
| Current Rating | 20A |
| Curve | B Curve |
| Residual Current | 30mA |
| Poles | 2 Pole (Live + Neutral switched) |
| Module Width | 1 (18mm) |
| Dimensions | 18 × 82 × 77mm |
| Mounting | DIN rail |
| Standards | BS EN 61009-1, BS 7671 |
Install the WRN20B-030 in a standard DIN rail consumer unit or distribution board. Ensure correct terminal torque and test residual operation with an RCBO tester. Final connections should be completed by a qualified electrician.
- Mounts on single 18mm DIN rail slots
- Compatible with standard busbar systems
- Switched neutral increases safety during testing and isolation
- Routine test button included
