3-Pole Type A RCBO – 40A B Curve 30mA 10kA (WRT340B-030)
18th Ed. Compliant
2-Year Warranty
UK Stock
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The WRT340B-030 is a 3-pole Type A RCBO designed for three-phase circuits requiring combined residual current and overcurrent protection at a 40A rated current. With a B curve characteristic and 30mA sensitivity, it provides reliable protection against overload, short-circuit, and earth leakage faults in a compact 3-module DIN rail format....
The WRT340B-030 is a 3-pole Type A RCBO designed for three-phase circuits requiring combined residual current and overcurrent protection at a 40A rated current. With a B curve characteristic and 30mA sensitivity, it provides reliable protection against overload, short-circuit, and earth leakage faults in a compact 3-module DIN rail format.
Type A residual current protection allows detection of AC residual currents and pulsating DC components, making this RCBO suitable for modern installations with electronic equipment. The B curve response is suited to circuits with low inrush current characteristics, such as lighting, control systems, and sensitive three-phase loads.
Installer note: The switched neutral design disconnects L1, L2, L3, and N together, improving isolation safety and simplifying testing during commissioning and maintenance.
- 3-pole Type A RCBO with integrated overcurrent protection
- 40A rated current with B curve characteristic
- 30mA residual current sensitivity
- 10kA short-circuit breaking capacity
- Switched neutral for full disconnection of live conductors
- Compact 3-module DIN rail design
- Clear IN / OUT / LOAD terminal markings
| Part Code | Rating | Curve | Residual Current |
|---|---|---|---|
| WRT340B-030 | 40A | B Curve | 30mA |
| WRT320C-030 | 20A | C Curve | 30mA |
| WRT332B-030 | 32A | B Curve | 30mA |
| WRT332C-030 | 32A | C Curve | 30mA |
| WRT340C-030 | 40A | C Curve | 30mA |
| WRT350C-030 | 50A | C Curve | 30mA |
The WRT340B-030 is a solid option for three-phase circuits where Type A residual current protection and a B curve response are required for higher current, low inrush applications.
When should a B curve RCBO be used?
B curve RCBOs are suited to circuits with low inrush currents, such as lighting, control systems, and sensitive electrical equipment.
Does this RCBO disconnect the neutral?
Yes. The switched neutral disconnects L1, L2, L3, and N simultaneously.
Is this suitable for three-phase commercial installations?
Yes. It is designed for three-phase commercial and industrial circuits where Type A protection is required.
What is the short-circuit breaking capacity?
The WRT340B-030 has a rated breaking capacity of 10kA.
Is this supplied pre-wired?
No. This is a DIN-rail-mounted RCBO and must be wired as part of the board installation.
- Device Type: 3-Pole RCBO
- Residual Current Type: Type A
- Rated Current: 40A
- Tripping Curve: B Curve
- Residual Current Sensitivity: 30mA
- Breaking Capacity: 10kA
- Number of Modules: 3
- Neutral: Switched
- Mounting: DIN rail (EN 60715)
- Rated Voltage: 230V AC
- Frequency: 50/60Hz
- Compliance: IEC / EN 61009-1
This RCBO must be installed by a qualified electrician within a three-phase distribution board. Correct identification of supply and load terminals is essential.
- Mount on a standard 35mm DIN rail
- Observe IN / OUT / LOAD markings carefully
- Do not connect incoming supply to load terminals
- Switched neutral supports safe isolation during testing
- Confirm B curve suitability for the connected load
