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131G3933 Danfoss VLT FC-102 HVAC Drive 37 kW / 50 HP, 380 – 480 VAC, IP20
Danfoss 131G3933 VLT HVAC Drive FC 102, a 37 kW three-phase variable frequency drive with IP20 chassis protection, Safe Stop and PROFIBUS DP MCA 101 communication for HVAC applications.
£2,669.15
Danfoss 131G3933 at a glance
The Danfoss 131G3933 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 B4, IP20 / chassis unit, built for mounting inside a control panel or enclosure.
This configuration has RFI class A1/B (C1), safe Stop, no brake chopper, a graphical LCP 102 control panel, and a PROFIBUS DP MCA 101 fieldbus card. The full type code is decoded alongside the FAQs.
Sizing and installation
- Enclosure: IP20 / chassis — built for mounting inside a control panel or 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 131H5673IP20 / chassis · frame B4View drive →
This drive37 kWDanfoss 131G3933IP20 / chassis · frame B4
Same 37 kW rating, other enclosures
This driveIP20Danfoss 131G3933IP20 / chassis
EnclosureIP21Danfoss 131B6183IP21 / UL Type 1View drive →
EnclosureIP55Danfoss 135U2852IP55 / UL Type 12 with backplateView drive →
EnclosureIP66Danfoss 131F4795IP66 / 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 | IP20 | |
| EMC Filter | Commercial | |
| Series | VLT® HVAC Drive FC 102 | |
| Type code | FC-102P37KT4E20H1TGXXXXSXXXXA0BXCXXXXDX | |
| Product type | Variable frequency drive | |
| Rated output power | 37 kW | |
| Horsepower rating | 50 HP | |
| Input voltage | 380-480 V AC | |
| Input phases | Three phase | |
| Output phases | Three phase | |
| Frequency | 50 / 60 Hz | |
| Protection rating | IP20 / chassis | |
| RFI filter | Class A1/B (C1) | |
| Safety function | Safe Stop | |
| Control panel | Graphical local control panel | |
| Communication option | PROFIBUS DP MCA 101 | |
| PCB coating | Not coated PCB | |
| Mains option | No mains option | |
| B option | No B option | |
| C1 option | No C1 option | |
| D option | No D option | |
| Frame size | B4 | |
| Weight | approx. 23.8 kg |
Frequently asked questions
Which communication protocols does it support?
This unit is fitted with a PROFIBUS DP MCA 101 card, in addition to the built-in RS-485 protocols: Danfoss FC, Modbus RTU, BACnet MS/TP, Metasys N2 and FLN Apogee.
Does this drive need to go in an enclosure?
Yes. IP20 / chassis drives are designed to be mounted inside a control panel or enclosure. For wall mounting without a panel, choose an IP55 or IP66 version.
Type code decoded
FC-102P37KT4E20H1TGXXXXSXXXXA0BXCXXXXDX
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 | IP20 / chassis | E20 |
| RFI filter Position 16–17 | RFI class A1/B (C1) | H1 |
| Brake / Safe Stop Position 18 | Safe Stop, no brake chopper | T |
| Local control panel Position 19 | Graphical LCP 102 | G |
| PCB coating Position 20 | Standard (uncoated) PCBs | X |
| 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 | PROFIBUS DP MCA 101 | A0 |
| 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 |
