Lewden BRCBO-B25/30/1HP 25A B Curve 30mA Type B-HP Heat Pump RCBO 6kA

Enhanced Type B RCBO Protection for Modern Heat Pump Installations

The Lewden BRCBO-B25/30/1HP is a specialist 25A B Curve Type B-HP RCBO developed specifically for heat pump installations requiring enhanced residual-current protection at higher frequencies. It combines 30mA residual-current protection, overload protection and short-circuit protection within a compact single-module device.

Lewden confirms that its B-HP range is available in 16A, 20A, 25A, 32A and 40A ratings, in both B and C curves, with a 30mA residual-current rating and 6kA short-circuit breaking capacity.

Key Features

• Lewden B-HP Heat Pump RCBO
• Product code BRCBO-B25/30/1HP
• 25A rated current
• B Curve overcurrent characteristic
• Enhanced Type B-HP residual-current protection
• 30mA residual-current rating
• 6kA short-circuit breaking capacity
• Designed for heat pump applications
• Suitable for applications with higher-frequency leakage currents
• Operational at frequencies of 20kHz and above
• Combines RCD and overcurrent protection
• Bi-directional
• 1 pole + switched neutral
• Compact 1-module design
• Only 18mm wide
• DIN rail mounting
• Compatible with suitable Lewden consumer units
• Certified to BS EN/IEC 61009-1
• Certified to BS EN/IEC 62423
• Operating temperature from -25°C to +40°C

Specifically Developed for Heat Pumps

Modern inverter-driven heat pumps can produce residual currents containing DC components and frequencies considerably above the normal 50Hz supply frequency. This means the appropriate RCD type must be selected according to the particular heat pump manufacturer's requirements rather than assuming that one RCD type suits every installation.

Lewden developed the Type B-HP RCBO range for heat pump applications where higher-frequency residual currents need to be accommodated.

Enhanced Type B-HP Protection

The BRCBO-B25/30/1HP goes beyond the basic description of a standard Type B protective device by addressing the higher-frequency requirements specified for certain heat pumps.

Lewden states that some manufacturers require an enhanced Type B device capable of catering for frequencies up to 20kHz, with a minimum trigger point of 150mA above 1kHz. Its B-HP RCBO is designed for operation at frequencies of 20kHz and above.

This makes it particularly relevant where the heat pump manufacturer's installation instructions specify this enhanced high-frequency performance.

25A B Curve Overcurrent Protection

This particular model provides a 25A rated current with a B Curve overcurrent characteristic.

The B Curve designation relates to the RCBO's overcurrent tripping characteristic and should not be confused with its Type B residual-current classification. They describe two separate protective functions.

The 25A version should therefore be selected where both its current rating and B Curve characteristic are appropriate for the heat pump, cable, installation method and overall circuit design.

30mA Residual-Current Protection

The BRCBO-B25/30/1HP has a 30mA rated residual operating current.

Lewden's complete B-HP family uses a 30mA residual-current rating across its 16A to 40A B and C Curve variants.

RCBO – RCD & Overcurrent Protection Combined

Because the BRCBO-B25/30/1HP is an RCBO, it combines the protective functions that would otherwise require separate devices:

• Residual-current protection
• Overload protection
• Short-circuit protection

This provides an important advantage over a Type B RCCB, which requires appropriate separate overcurrent protection.

Lewden specifically highlights that its B-HP RCBO eliminates the need for the additional MCB required with a Type B RCCB arrangement.

Compact 18mm Single-Module Design

The Lewden B-HP RCBO occupies just one 18mm consumer-unit module.

This compact construction can make a substantial difference when installing a heat pump circuit into a consumer unit with limited available space. Lewden contrasts the single-module B-HP RCBO with an RCCB and MCB arrangement that can require approximately three modules.

The result is a neat solution combining specialist residual-current and overcurrent protection without unnecessarily consuming consumer-unit capacity.

6kA Short-Circuit Breaking Capacity

The BRCBO-B25/30/1HP has a 6kA short-circuit breaking capacity, as specified across Lewden's B-HP RCBO family.

Its integral overcurrent protection means that, unlike an RCCB, the device provides both overload and short-circuit protection as part of the RCBO.

Bi-Directional Operation

Lewden specifies its Type B-HP RCBOs as bi-directional, providing additional flexibility for suitable electrical installations.

1 Pole + Switched Neutral

The BRCBO-B25/30/1HP uses a 1 pole plus switched neutral configuration, despite occupying only a single 18mm module.

The combination of switched neutral, bi-directional operation and single-module construction makes it a particularly compact circuit-protection solution for appropriate heat pump installations.

Compatible with Lewden Consumer Units

Lewden states that its B-HP RCBOs can be installed within a standard Lewden RCBO consumer unit.

They can also be used as one of the High Integrity circuits within compatible Lewden Dual RCCB, Split Load and Dual Tariff consumer units.

This provides flexibility for both new heat pump installations and upgrades to suitable existing Lewden distribution equipment.

Certified to Relevant Standards

Lewden specifies its B-HP RCBO range as certified to:

BS EN/IEC 61009-1 – residual-current operated circuit breakers with integral overcurrent protection.

BS EN/IEC 62423 – requirements relating to Type F and Type B residual-current operated circuit breakers.

The specified operating temperature range is -25°C to +40°C.

• Brand: Lewden
• Range: B-HP Heat Pump RCBO
• Product Code: BRCBO-B25/30/1HP
• Product Type: Heat Pump RCBO
• RCD Classification: Type B-HP / Enhanced Type B
• Rated Current: 25A
• Trip Curve: B Curve
• Rated Residual Current: 30mA
• Short-Circuit Breaking Capacity: 6kA
• Pole Configuration: 1 Pole + Switched Neutral
• Bi-Directional: Yes
• Module Width: 1 Module
• Width: 18mm
• Residual-Current Protection: Yes
• Overload Protection: Yes
• Short-Circuit Protection: Yes
• High-Frequency Operation: 20kHz and Above
• Mounting: DIN Rail
• Operating Temperature: -25°C to +40°C
• Standards: BS EN/IEC 61009-1 & BS EN/IEC 62423
• Primary Application: Heat Pump Circuit Protection
• Consumer Unit Compatibility: Suitable Lewden RCBO Consumer Units & Compatible High Integrity Ways

Lewden confirms these core family characteristics for the current B-HP range, including the 25A B Curve variant.

Suitable Applications

• Air Source Heat Pumps
• Ground Source Heat Pumps
• Inverter-Driven Heat Pumps
• Domestic Heat Pump Installations
• Commercial Heat Pump Installations
• Dedicated Heat Pump Circuits
• Renewable Heating Systems
• Low-Carbon Heating Installations
• Residential Electrical Installations
• Commercial Electrical Installations
• Lewden Consumer Units
• High Integrity Consumer Unit Circuits
• Heat Pumps Requiring Enhanced Type B Protection

Why Choose the Lewden BRCBO-B25/30/1HP?

The Lewden BRCBO-B25/30/1HP provides a compact specialist solution for heat pump circuits where the equipment manufacturer requires enhanced Type B residual-current performance.

Its 25A B Curve rating, 30mA residual-current protection and 6kA breaking capacity are combined within one RCBO, providing residual-current, overload and short-circuit protection without requiring a separate MCB.

The biggest practical advantage is its single-module 18mm construction. Combined with bi-directional operation and 1 pole plus switched neutral configuration, it provides sophisticated heat pump circuit protection while occupying minimal consumer-unit space.

The appropriate RCD type, current rating and trip curve should always be checked against the specific heat pump manufacturer's requirements and the circuit design rather than assuming that every heat pump requires Type B-HP protection.