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The WER40C-030 high immunity RCBO combines 40A C-curve overcurrent protection and 30mA Type A residual current protection in a two-module device. With 10kA breaking capacity, switched live and neutral and separate black and white operating handles, it provides circuit protection with a useful fault-finding indication for the electrician.
Choose this model when the circuit design specifies 40A, C curve and Type A protection. Check all three: C curve describes the overcurrent trip characteristic, while Type A describes the residual current waveforms detected. They are separate parts of the specification.
Practical benefits on site
- Twin handles help identify the fault type: Whitecliffe states that the black handle alone tripping indicates an overload or short circuit; both handles tripping indicates a residual current fault. This gives the electrician a useful starting point for diagnosis.
- Switched live and neutral: both conductors are disconnected when the device operates.
- Combined protection in one device: overload, short-circuit and residual current functions in the same RCBO.
- Two-module DIN-rail format: allow the required space and check the board and busbar compatibility before selecting it.
Check the curve and residual current type
C-curve devices can suit loads with higher starting currents when the circuit design permits them. A C curve is not an automatic upgrade from B curve or a cure for an unexplained trip: fault protection, cable sizing and the connected equipment must all be checked.
Type A detects AC and pulsating DC residual currents. It is not Type B protection and does not provide a separately specified 6mA smooth-DC detection function. For an EV charger, heat pump or other inverter-based load, confirm the equipment manufacturer's required protection before choosing this RCBO.
Gallery note: the images illustrate the WER range and include other ratings and curves. This listing is for WER40C-030, marked C40; the B40-marked device shown is a different variant.
Compare closely related WER RCBOs
| Model | Rating / curve | Choose when |
|---|---|---|
| WER40C-030 — this product | 40A / C curve | Your circuit design specifies 40A overcurrent protection with a C-curve characteristic. |
| WER40B-030 | 40A / B curve | The required current rating is 40A, but the circuit design specifies B curve. |
| WER32C-030 | 32A / C curve | The circuit requires the lower 32A current rating with a C-curve characteristic. |
These three variants share Type A, 30mA protection and the WER two-module format. Select the current rating and curve from the circuit design; do not substitute a variant solely because it is available.
Check availability or the correct variant
contact Power & Data UK quoting WER40C-030, the board model, required quantity and delivery date. If this item is shown as unavailable, ask for the current lead time. For technical details, view the Whitecliffe WER datasheet.
