WCED WRB120B-030 Bi-Directional RCBO
The WCED WRB120B-030 Bi-Directional RCBO is a 20A B Curve protective device from the Whitecliffe Electrical WRB1 range. Designed for domestic and commercial distribution boards, it combines overload, short-circuit and Type A residual current protection in a compact single-module housing. With 30mA sensitivity and a 6kA breaking capacity, this RCBO provides individual circuit protection without requiring a separate RCD for the same function.
Its bi-directional design also makes it suitable for consideration in correctly specified solar photovoltaic installations. Switched live and neutral contacts and versatile connection terminals make the WRB120B-030 a practical choice for electrical contractors working with compatible WCED distribution equipment.
Key Features – WCED WRB120B-030 Bi-Directional RCBO
- 20A rated current with B Curve tripping characteristic
- Type A high-immunity residual current protection
- 30mA residual operating sensitivity
- 6kA short-circuit breaking capacity
- Bi-directional design for suitable solar PV circuits
- 1P+N arrangement with switched live and neutral
- Space-saving single-module construction, approximately 18mm wide
- Electronic residual current detection and thermal-magnetic overcurrent release
- Bi-connect terminals for compatible cables and busbars
- Contact position indicator
- DIN rail mounting to EN 60715 (35mm)
- Complies with IEC 61009-1 and EN 61009-1
20A B Curve Protection for Electrical Circuits
The WRB120B-030 provides a 20A rated current with a B Curve tripping characteristic, typically selected for appropriately designed circuits with relatively low inrush currents. B Curve protection may be suitable for selected lighting, heating and general electrical loads, depending on cable sizing, installation conditions and the equipment connected.
By combining residual current detection with thermal-magnetic overcurrent protection, the device provides dedicated protection for its assigned circuit. This helps reduce disruption to other circuits when an individual fault occurs.
Bi-Directional RCBO for Solar PV Applications
The WCED WRB120B-030 Bi-Directional RCBO is part of the WRB1 range, designed for installations where electrical power may flow in either direction. This can be relevant to suitably designed solar PV circuits incorporating generation equipment.
For photovoltaic applications, device selection must account for inverter specifications, circuit configuration, prospective fault current and the required residual current protection.
Although the device is described as bi-directional, the manufacturer’s connection requirements and terminal markings must be followed. The WCED datasheet specifies connection from the bottom.
Type A High-Immunity Residual Current Detection
Unlike traditional Type AC devices, the WRB120B-030 detects both sinusoidal AC and pulsating DC residual currents. Its Type A classification provides broader residual current detection for modern electrical installations containing compatible electronic equipment.
The 30mA residual operating sensitivity provides additional protection against electric shock when correctly installed. The high-immunity designation forms part of the manufacturer’s WRB1 range specification.
Switched Live and Neutral
The WRB120B-030 features a 1P+N configuration with switched live and neutral as standard. When the protective device operates, both conductors are disconnected from the protected circuit.
This arrangement supports individual circuit isolation and can simplify certain inspection and insulation resistance testing procedures, subject to the testing method and connected equipment.
Compact Single-Module Installation
With an approximately 18mm-wide housing, this WCED RCBO occupies a single module on a standard DIN rail, helping preserve space within compatible consumer units and distribution boards.
The bi-connect terminal design accommodates suitable cable, pin-type and fork/U-type busbar connections. WCED specifies a tightening torque of 2.5Nm and mounting on a standard 35mm DIN rail.
Technical Specifications – WCED WRB120B-030 Bi-Directional RCBO
- Brand: WCED Whitecliffe Electrical
- Manufacturer Part Number: WRB120B-030
- Product Range: WRB1
- Device Type: Electronic Bi-Directional RCBO
- Rated Current: 20A
- Tripping Characteristic: B Curve
- Residual Current Type: Type A High Immunity
- Rated Residual Operating Current: 30mA
- Rated Breaking Capacity: 6kA
- Number of Poles: 1P+N (Switched Live and Neutral)
- Rated Operational Voltage: 230V AC
- Rated Frequency: 50/60Hz
- Rated Insulation Voltage: 500V
- Rated Residual Making and Breaking Capacity: 3000A
- Rated Impulse Withstand Voltage: 4kV
- Residual Current Break Time at IΔn: ≤0.1 seconds
- Dielectric Test Voltage: 2kV for 1 minute
- Pollution Degree: 2
- Electrical Endurance: 2,000 operations
- Mechanical Endurance: 10,000 operations
- Contact Position Indicator: Yes
- Protection Rating: IP20
- Reference Temperature: 30°C
- Operating Temperature: -5°C to +40°C
- Storage Temperature: -25°C to +70°C
- Top Cable Terminal Capacity: 10mm²
- Bottom Cable Terminal Capacity: 16mm²
- Busbar Terminal Capacity: 10mm²
- Terminal Tightening Torque: 2.5Nm
- Mounting: 35mm DIN Rail, EN 60715
- Manufacturer-Specified Connection: From Bottom
- Applicable Standards: IEC 61009-1 / EN 61009-1
Other WCED B Curve Bi-Directional RCBOs
Need a different current rating? Explore other WCED WRB1 B Curve models:
- WCED WRB106B-030 – 6A B Curve RCBO
- WCED WRB110B-030 – 10A B Curve RCBO
- WCED WRB116B-030 – 16A B Curve RCBO
- WCED WRB132B-030 – 32A B Curve RCBO
- WCED WRB140B-030 – 40A B Curve RCBO
Explore WCED Whitecliffe Circuit Protection
Browse our WCED Consumer Units or discover the complete WCED Whitecliffe range at Electrical4Less.
Before installation, verify that the RCBO is compatible with the selected consumer unit, circuit design and connected equipment. Protective device selection and installation must meet applicable electrical installation requirements.
