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131G9661 Danfoss VLT HVAC Drive 37 kW/50HP 380-480VAC IP55
Danfoss 131G9661 VLT HVAC Drive FC 102 variable speed drive, 37 kW / 50 HP, three-phase 380-480 V AC, IP55 / Type 12 backplate enclosure, designed for HVAC motor control applications.
£2,894.65
Danfoss 131G9661 at a glance
The Danfoss 131G9661 is a 37 kW VLT HVAC Drive FC 102 for 3 × 380–480 V AC supplies, made for the fans, pumps and compressors in building services. It is a frame C1, IP55 / UL Type 12 with backplate unit, built for wall mounting in plant rooms without a separate enclosure.
This configuration has RFI class A1/B (C1), no brake chopper, and a graphical LCP 102 control panel. The full type code is decoded alongside the FAQs.
Sizing and installation
- Enclosure: IP55 / UL Type 12 with backplate — built for wall mounting in plant rooms without a separate enclosure.
- EMC: RFI class A1/B (C1). Check the permitted screened motor cable length in the Danfoss FC 102 Design Guide.
FC 102 features for HVAC
- Built-in RS-485 protocols: Danfoss FC, Modbus RTU, BACnet MS/TP, Metasys N2 and FLN Apogee — connects to most building management systems without an option card.
- Fire Mode keeps the drive running during an emergency, for example to keep smoke-extract fans turning.
- Automatic Energy Optimisation (AEO) cuts motor losses at part load — Danfoss quotes a further 5–15% saving.
- Pump and fan functions: sleep mode, dry-pump, end-of-curve and broken-belt detection, plus a built-in cascade controller for pump sets.
- Built-in DC coils limit mains harmonics (EN 61000-3-12).
- Smart Logic Controller for simple sequencing without a PLC.
Where the energy saving comes from
Centrifugal fans and pumps follow the affinity laws: absorbed power falls with the cube of speed. Running at 80% speed needs roughly half the power of full speed (0.8³ ≈ 0.51, before motor and drive losses) — which is why speed control pays back faster on fans and pumps than almost any other load.
Other sizes and enclosures
Same configuration, different power
Smaller30 kWDanfoss 131N2997IP55 / UL Type 12 with backplate · frame B2View drive →
This drive37 kWDanfoss 131G9661IP55 / UL Type 12 with backplate · frame C1
Larger90 kWDanfoss 131G9475IP55 / UL Type 12 with backplate · frame C2View drive →
Same 37 kW rating, other enclosures
This driveIP55Danfoss 131G9661IP55 / UL Type 12 with backplate
EnclosureIP20Danfoss 131F6630IP20 / chassisView drive →
EnclosureIP21Danfoss 131B6183IP21 / UL Type 1View drive →
EnclosureIP66Danfoss 131F6437IP66 / UL Type 4XView drive →
Typical applications
✓ Supply and extract fans in air-handling units
✓ Chilled- and hot-water circulation pumps
✓ Cooling towers and condenser fans
✓ Booster sets and multi-pump stations
✓ Ventilation and smoke-extract systems
Technical Specifications
Tick the specs you need, then view products that match.
| Power | 37 kW | |
|---|---|---|
| Voltage | 480 V | |
| Phase | Three Phase | |
| IP Rating | IP55 | |
| EMC Filter | Commercial | |
| Series | VLT® HVAC Drive FC 102 | |
| Part Number | 131G9661 | |
| Model Code | FC-102P37KT4P55H1XGCXXXSXXXXAXBXCXXXXDX | |
| Product type | Variable speed drive / frequency converter | |
| Rated output power | 37 kW | |
| Horsepower rating | 50 HP | |
| Input voltage | 380–480 V AC | |
| Input phases | Three-phase | |
| Frequency | 50 / 60 Hz | |
| Protection rating | IP55 / Type 12 backplate | |
| RFI filter | Class A1/B (C1) | |
| Brake chopper | No brake chopper | |
| Control panel | Graphical Local Control Panel | |
| PCB type | Coated PCB | |
| Mains option | No mains option | |
| A option | No A option | |
| B option | No B option | |
| C1 option | No C1 option | |
| D option | No D option | |
| Frame size | C1 | |
| Dimensions (H × W × D) | approx. 685 × 308 × 311 mm | |
| Net weight | approx. 41.29 kg | |
| EAN | 5702427704084 |
Frequently asked questions
Which communication protocols are built in?
Danfoss FC, Modbus RTU, BACnet MS/TP, Metasys N2 and FLN Apogee over the built-in RS-485 port. This unit has no fieldbus option card fitted, so PROFIBUS, PROFINET, EtherNet/IP or BACnet/IP would need an MCA option card.
Can this drive be wall mounted without a panel?
Yes. The IP55 / UL Type 12 with backplate enclosure is designed for direct mounting.
Type code decoded
FC-102P37KT4P55H1XGCXXXSXXXXAXBXCXXXXDX
G fitted / defines this unit X not fitted / standard
| Product series Position 1–6 | VLT HVAC Drive FC 102 | FC-102 |
|---|---|---|
| Power size Position 7–10 | 37 kW | P37K |
| Mains voltage Position 11–12 | 3 × 380–480 V AC | T4 |
| Enclosure Position 13–15 | IP55 / UL Type 12 with backplate | P55 |
| RFI filter Position 16–17 | RFI class A1/B (C1) | H1 |
| Brake / Safe Stop Position 18 | No brake chopper | X |
| Local control panel Position 19 | Graphical LCP 102 | G |
| PCB coating Position 20 | Conformal-coated PCBs | C |
| Mains option Position 21 | No mains option | X |
| Adaptation A Position 22 | Standard cable entries | X |
| Adaptation B Position 23 | Standard | X |
| Software release Position 24–27 | Latest standard release | SXXX |
| Software language Position 28 | Standard language package | X |
| A option (fieldbus) Position 29–30 | No fieldbus option | AX |
| B option (I/O) Position 31–32 | No B option | BX |
| C0 option Position 33–34 | No C0 option | CX |
| C1 option Position 35 | No C1 option | X |
| C option software Position 36–37 | None | XX |
| D option Position 38–39 | No D option | DX |
