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.
£47,119.20
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.
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.
| 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 |
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.
This model is rated at approximately 250 kW / 350 HP with a 480 A current rating.
The 137U3975 operates from a three-phase 380–500 V AC supply.
The drive is supplied in an IP21 / UL Type 1 enclosed cabinet, suitable for protected industrial environments.
Yes. This model includes PROFINET RT communication for integration with PLCs and industrial automation networks.
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.
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LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...