We use cookies to make your experience better. To comply with the new e-Privacy directive, we need to ask for your consent to set the cookies. Learn more.
131B4251 Danfoss VLT FC-102 HVAC Drive 18.5 KW / 25 HP, 380 - 480 VAC, IP55
MPN: 131B4251
Alt. SKU: FC-102P18KT4P55H2XGXXXXSXXXXAXBXCXXXXDX
Special Price
£2,193.12
£1,827.60
Regular Price
£3,655.20
Why Choose the Danfoss 131B4251 VLT® HVAC Drive FC 102?
The Danfoss 131B4251 is a dependable and energy-efficient AC variable speed drive (VSD) designed for precise motor control in heating, ventilation and air conditioning systems. As part of the proven Danfoss VLT® HVAC Drive FC 102 series, it is developed for HVAC applications where reliable speed control, reduced energy consumption and long service life are essential.
This drive provides intelligent HVAC motor control for fans, pumps, compressors and air handling equipment. The FC 102 platform is widely used in commercial buildings, plant rooms and industrial facilities, helping optimise motor performance while reducing mechanical wear and unnecessary energy use.
With a rated output power of 18.5 kW / 25 HP and a three-phase 380–480 V AC supply, the Danfoss 131B4251 is well suited to demanding HVAC motor control applications. Its IP55 / Type 12 backplate enclosure, integrated RFI Class A2 (C3) filter and graphical local control panel make it a practical solution for modern building services and energy-saving installations.
Key Advantages
- Dedicated variable speed drive for HVAC applications.
- 18.5 kW / 25 HP motor power rating for larger fans, pumps and compressors.
- Three-phase 380–480 V AC input compatible with industrial power systems.
- IP55 / Type 12 backplate enclosure for demanding HVAC environments.
- Integrated RFI Class A2 (C3) filter for reduced electrical interference.
- Graphical Local Control Panel supports easy setup, monitoring and commissioning.
Key Features
- Danfoss VLT® HVAC Drive FC 102 series.
- 18.5 kW / 25 HP rated output power.
- Three-phase 380–480 V AC input supply.
- IP55 / Type 12 protection rating.
- Integrated RFI Class A2 (C3) filter.
- Graphical Local Control Panel for intuitive operation.
- No brake chopper configuration.
- B1 frame design for HVAC plant and building services installations.
Technical Specifications
- Manufacturer: Danfoss
- Series: VLT® HVAC Drive FC 102
- Model: 131B4251
- Model code: FC-102P18KT4P55H2XGXXXXSXXXXAXBXCXXXXDX
- Product type: AC variable speed drive / frequency converter
- Rated output power: 18.5 kW / 25 HP
- Input voltage: 380–480 V AC
- Input phases: 3-phase
- Frequency: 50 / 60 Hz
- Protection rating: IP55 / Type 12
- RFI filter: Class A2 (C3)
- Brake chopper: No brake chopper
- Control panel: Graphical Local Control Panel
- PCB coating: Not coated PCB
- Mains option: No mains option
- Frame size: B1
- Dimensions (H × W × D): approx. 480 × 242 × 260 mm
- Weight: approx. 22 kg
Reliable Motor Control for HVAC Systems
Variable speed drives such as the Danfoss VLT® HVAC Drive FC 102 regulate motor speed by adjusting output frequency and voltage. This enables HVAC systems to match motor performance to actual demand, helping reduce energy consumption, lower operating costs and minimise stress on connected mechanical equipment.
The FC 102 series is designed for HVAC engineers, facilities teams and building services contractors who require stable motor control and dependable operation. Its HVAC-specific functionality, integrated filtering and user-friendly graphical interface make it suitable for both new installations and replacement drive projects.
Typical Applications
- Large air handling units and ventilation systems.
- Commercial and industrial pump control.
- Fan speed control in HVAC plant rooms.
- Compressors and refrigeration systems.
- Cooling towers and chilled water systems.
- Building management systems and energy-saving HVAC installations.
Frequently Asked Questions
What is the Danfoss 131B4251 used for?
This drive is used to control the speed of AC motors in HVAC systems, including fans, pumps, compressors, air handling units and ventilation equipment.
What motor power is supported by this drive?
The drive supports motors with a rated output power of approximately 18.5 kW / 25 HP.
What supply voltage does the drive require?
The Danfoss 131B4251 operates from a three-phase 380–480 V AC supply.
What enclosure rating does this drive have?
This model has an IP55 / Type 12 enclosure rating, making it suitable for demanding HVAC and building services environments.
Does the Danfoss 131B4251 include a brake chopper?
No, this model is supplied with no brake chopper.
Trusted by HVAC Engineers Worldwide
Danfoss VLT® HVAC Drives are widely used by building services engineers, facilities teams and HVAC specialists to deliver efficient motor control, reliable operation and reduced energy consumption across commercial and industrial systems.
| Manufacturer Part Number | 131B4251 |
|---|---|
| Barcode | 5702427229310 |
| Height | 494mm |
| Width | 243mm |
| Depth | 261mm |
| Filter | Filter Included |
| Input Phases | Three Phase |
| Degree of protection (IP) | IP55 |
| KW Rating | 18.5kW |
| Output Phases | Three phase |
| VSD Range | Danfoss VLT FC102 |
| Manufacturer | Danfoss |
| Alternative Product SKU | FC-102P18KT4P55H2XGXXXXSXXXXAXBXCXXXXDX |
Write Your Own Review
The VLT HVAC drive has built-in intelligence to give optimal process control to heating, ventilation and air conditioning (HVAC). It is simple to use and extremely cost-efficient, featuring a number of functions that are ideal for use with pumps, fans and compressors to save energy, meet environmental regulations and reduce costs in modern buildings.
The VLT HVAC drive has a compact, robust design and is ideally suited to locations where space is restricted. A selection of safety features, such as Safe Torque Off and Safe Maximum Speed, protect both applications and their operators.
Enclosures can be purchased separately, up to IP66, and an additional option available upon purchase is a unique coating to provide added protection for the circuit boards. Integrated DC chokes and RFI filters safeguard installations by minimizing harmonic distortion and electromagnetic.
Supply voltages and power range
3 x 200-240 V...1.1-45 kW
3 x 380-480 V...1.1 kW – 1 MW
3 x 525-600 V...1.1-90 kW
3 x 525-690 V...45 kW – 1.4 MW
Low harmonic drive
3 x 380-480 V...132-710 kW
12-pulse drive
3 x 380-480 V...250-200kW
Features and benefits
- There’s no need for external cooling or oversizing as the maximum ambient temperature is 50°C without derating
- PLC capacity is often unnecessary thanks to the Smart Logic Controller
- A low initial investment and easy upgrades are possible thanks to the modular concept with a wide range of options
- The need for external control and conversion equipment is avoided due to integrated pump, fan and compressor functionality
- 5–15% energy is saved as a result of the Automatic Energy Optimization function
- Less gateway solutions are needed thanks to a wide range of HVAC protocols for building management system controller connectivity
Applications
Pumps, fans, compressors.
PC tools
VLT® Motion Control Tool MCT 10
VLT® Motion Control Tool MCT 31
Danfoss ecoSmart
Danfoss HCS (Harmonic Calculation Software)
Danfoss Servo Sizer
VLT® Energy Box
For further information on this product please get in touch with our team or visit the Danfoss website.
