Hager CDB540HP Type B HP RCCB – 40A 30mA for Heat Pumps
The Hager CDB540HP Type B HP RCCB is a 40A, 30mA residual current circuit breaker designed for heat pump installations incorporating inverter-driven compressors. It detects AC, pulsating DC and smooth DC residual fault currents and features specialist high-frequency operating characteristics.
Discontinued Model – 63A Replacement
The Hager CDB540HP 40A Type B HP RCCB has been discontinued. For future installations and replacement requirements, the higher-current-rated Hager CDB563HP 63A 30mA Type B HP RCCB is the recommended alternative.
The 63A model retains the same 30mA sensitivity and Type B HP residual-current classification. A suitably specified 63A RCCB can replace a 40A RCCB on an appropriately protected circuit without changing its overload or short-circuit protection.
Key Features
- 40A rated current.
- 30mA residual operating sensitivity.
- Type B HP residual-current protection for heat pump applications.
- Detection of AC, pulsating DC and smooth DC residual currents.
- Specialist high-frequency response for inverter-driven heat pumps.
- Designed to help reduce unwanted tripping associated with certain high-frequency leakage currents.
- 1P+N configuration for suitable single-phase installations.
- Separate overcurrent protection required.
Why Type B HP Protection Is Used for Heat Pumps
Modern heat pumps frequently incorporate inverter technology to control compressor operation. This equipment can generate DC leakage components and high-frequency residual currents that require suitable protective devices.
The Hager CDB540HP Type B HP RCCB was developed for these applications, providing residual-current detection alongside specialist high-frequency operating characteristics.
Device selection must follow the installation design and heat pump manufacturer’s requirements.
Hager CDB563HP – 63A Alternative
The CDB563HP provides a higher rated current of 63A while retaining 30mA sensitivity and specialist Type B HP residual-current protection.
The increased RCCB current rating does not increase the rating of the circuit’s separate MCB or fuse. This makes the 63A model suitable for consideration as a replacement for a 40A RCCB where installation compatibility is confirmed.
View Hager CDB563HP 63A Type B HP RCCB
Technical Specifications
| Manufacturer | Hager |
| Product Code | CDB540HP |
| Product Type | Residual Current Circuit Breaker (RCCB) |
| Residual Current Type | Type B HP |
| Rated Current | 40A |
| Rated Residual Operating Current | 30mA |
| Number of Poles | 1P+N |
| Application | Heat Pump Residual-Current Protection |
| Product Status | Discontinued |
| Recommended Alternative | Hager CDB563HP – 63A 30mA Type B HP |
Related Heat Pump Protection
Explore our Heat Pump Consumer Units and RCDs for Heat Pumps.
For additional technical information, read our Hager B-HP Protection for Heat Pumps Guide.
Frequently Asked Questions
Has the Hager CDB540HP been discontinued?
Yes. The CDB540HP is a discontinued 40A Type B HP RCCB. The CDB563HP 63A version is the recommended higher-current-rated alternative for future requirements.
Can a 63A RCCB replace a 40A RCCB?
Yes. A suitably specified 63A RCCB can replace a 40A RCCB on an appropriately protected circuit. The separate overcurrent protective device continues to protect against overloads and short circuits.
Does the 63A version retain the same sensitivity?
Yes. Both devices have 30mA residual operating sensitivity and Type B HP classification.
Does the CDB540HP provide overload protection?
No. An RCCB provides residual-current protection only. Separate overload and short-circuit protection is required.
Hager Heat Pump Protection at Electrical4Less
Electrical4Less supplies specialist Hager circuit protection equipment for electricians and heat pump installers across the UK.
Browse our Hager Shop for related electrical protection products.
