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137U3975 Danfoss iC7-Automation 250kW/350 3 phase low-harmonic drive
Danfoss 137U3975 iC7-Automation enclosed drive, an air-cooled low-harmonic AC variable frequency drive rated at 250 kW / 350 HP and 480 A with 380-500 V AC three-phase input, IP21 / UL Type 1 enclosure, PROFINET RT communication and functional safety.
£44,174.25
Why Choose the Danfoss 137U3975 iC7-Automation Enclosed Drive?
The Danfoss 137U3975 is a high-performance AC variable frequency drive (VFD) from the advanced Danfoss iC7-Automation Enclosed Drive series, designed for demanding industrial motor control applications. Built as an enclosed, air-cooled drive solution, it provides reliable speed regulation, improved energy efficiency and robust operation for modern automation and process systems.
The iC7-Automation platform is developed for demanding industrial environments where power quality, connectivity and dependable motor control are essential. This model features a low-harmonic drive design, integrated PROFINET RT communication, coated boards, functional safety capability and a practical IP21 / UL Type 1 enclosure for cabinet-style industrial installations.
With a rated output power of 250 kW / 350 HP, a 480 A current rating and a three-phase 380–500 V AC supply, the Danfoss 137U3975 is suitable for large motors used in conveyors, pumps, fans, compressors, process machinery and heavy-duty automation systems. Its enclosed construction supports straightforward installation while maintaining strong operational reliability.
Key Advantages
- High-performance iC7-Automation enclosed variable frequency drive.
- 250 kW / 350 HP power rating for large industrial motors.
- 480 A current rating for demanding motor control applications.
- Three-phase 380–500 V AC input compatible with industrial power systems.
- Low-harmonic drive configuration helps improve power quality.
- IP21 / UL Type 1 enclosure for protected industrial installations.
- Integrated PROFINET RT communication for automation network connectivity.
Key Features
- Danfoss iC7-Automation Enclosed Drive series.
- 250 kW / 350 HP rated output power.
- 480 A current rating.
- Three-phase 380–500 V AC input supply.
- IP21 / UL Type 1 enclosure.
- Low-harmonic air-cooled enclosed drive.
- EMC Category C3.
- Control Panel 2.8 OPX20.
- Standard I/O with relay option.
- PROFINET RT OS7PR communication.
- Functional safety: STO, SS1-t and fieldbus.
- Mains contactor and switch included.
Advanced Drive Control for Demanding Industrial Systems
Variable frequency drives such as the Danfoss 137U3975 regulate motor speed by adjusting output frequency and voltage. This helps improve process control, reduce mechanical stress and optimise energy consumption across large industrial machines and production systems.
The iC7-Automation enclosed drive platform is suited to applications where power quality, connectivity and reliability are important. Its low-harmonic design helps reduce mains distortion, while integrated PROFINET RT communication supports smooth integration with PLCs and wider automation networks.
Typical Applications
- Heavy-duty industrial conveyors and material handling systems.
- Large pumps and water handling equipment.
- Industrial fans, blowers and ventilation systems.
- Compressors and process machinery.
- Production lines and manufacturing equipment.
- Mining, marine and heavy industrial automation systems.
- Applications requiring low-harmonic drive performance.
Technical Specifications
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| Power | 250 kW | |
|---|---|---|
| Current | 480 A | |
| Voltage | 500 V | |
| Phase | Three Phase | |
| IP Rating | IP21 | |
| Series | iC7-Automation Enclosed Drives | |
| Part Number | 137U3975 | |
| Product type | AC variable frequency drive | |
| Drive type | Enclosed air-cooled low-harmonic drive | |
| Rated output power | 250 kW / 350 HP | |
| Rated current | 480 A | |
| Input voltage | 380–500 V AC | |
| Input phases | 3-phase | |
| Protection rating | IP21 / UL Type 1 | |
| EMC category | C3 | |
| Frame | AE10 + IE10 | |
| Control panel | Control Panel 2.8 OPX20 | |
| Standard I/O | I/O and Relay Option OC7C1 | |
| Functional safety | STO, SS1-t, fieldbus | |
| Brake chopper | Not fitted | |
| PCB protection | Coated boards | |
| Control power supply | 24 VDC | |
| Auxiliary voltage supply | AC voltage transformer | |
| Gross weight | approx. 810 kg | |
| Net weight | approx. 690 kg | |
| EAN | 5715253723778 |
Frequently Asked Questions
What is the Danfoss 137U3975 used for?
The Danfoss 137U3975 is used to control the speed and torque of large three-phase AC motors in demanding industrial automation, process and machinery applications.
What power rating does this drive have?
This model is rated at approximately 250 kW / 350 HP with a 480 A current rating.
What supply voltage does the drive require?
The 137U3975 operates from a three-phase 380–500 V AC supply.
What enclosure rating does the Danfoss 137U3975 have?
The drive is supplied in an IP21 / UL Type 1 enclosed cabinet, suitable for protected industrial environments.
Does this drive support industrial communication?
Yes. This model includes PROFINET RT communication for integration with PLCs and industrial automation networks.
Trusted by Industrial Automation Professionals
Danfoss iC7-Automation enclosed drives are used by industrial engineers, system integrators and plant operators who require reliable motor control, improved power quality and robust performance for demanding automation environments.
