Danfoss 137U3997 iC7-Automation enclosed drive, a 355 kW three phase low-harmonic variable frequency drive designed for demanding industrial motor control and automation applications.
£73,704.80
The Danfoss 137U3997 is a high-performance iC7-Automation enclosed drive designed for demanding industrial motor control applications requiring efficient, reliable and low-harmonic operation. As part of the advanced Danfoss iC7-Automation drive range, this enclosed variable frequency drive is engineered for precise control of large three-phase motors in automation, process and infrastructure environments.
This air-cooled enclosed drive combines robust cabinet construction with advanced Danfoss drive technology, helping support dependable operation in industrial electrical rooms and plant drive areas. Its low-harmonic configuration helps improve power quality, while integrated Modbus TCP communication and functional safety options make it suitable for modern automation systems.
With a rated output power of 355 kW / 500 HP, a 658 A current rating and a three-phase 380–500 V AC supply, the Danfoss 137U3997 is ideal for large motors used in pumps, fans, compressors, conveyors and process machinery. Its IP54 / UL Type 12 enclosed format provides enhanced protection for demanding industrial installations.
Variable frequency drives such as the Danfoss 137U3997 regulate motor speed and torque by controlling output voltage and frequency. This helps improve process control, reduce mechanical stress and optimise energy use across large motor-driven systems.
The iC7-Automation enclosed drive platform is designed for demanding applications where uptime, power quality and automation integration are essential. Its low-harmonic configuration supports cleaner electrical performance, while the enclosed cabinet format helps simplify installation in industrial plant rooms and control environments.
| Power | 355 kW |
|---|---|
| Current | 658 A |
| Voltage | 500 V |
| Phase | Three Phase |
| IP Rating | IP54 |
| Series | iC7-Automation |
| Product code | 137U3997 |
| Product type | Enclosed variable frequency drive |
| Drive category | Air-cooled enclosed drive |
| Drive configuration | Low-harmonic drive |
| Rated output power | 355 kW / 500 HP |
| Current rating | 658 A |
| Input voltage | 380–500 V AC |
| Input phases | 3-phase |
| Input frequency | 50 / 60 Hz |
| Output frequency | 0–599 Hz |
| Protection rating | IP54 / UL Type 12 |
| EMC category | C3 |
| Frame size | AE11 + IE11 |
| Functional safety | STO, SS1-t, fieldbus |
| Control panel | Control Panel 2.8 OPX20 |
| Standard I/O | I/O and Relay Option OC7C1 |
| Output filter | Common-mode Filter OFXC1 |
| Cooling method | Air cooled |
| Dimensions (H × W × D) | approx. 2305 × 1608 × 685 mm |
| Net weight | approx. 1147.9 kg |
| Gross weight | approx. 1437.9 kg |
| EAN | 5715253723990 |
The Danfoss 137U3997 is used to control the speed and torque of large three-phase AC motors in demanding industrial automation, process and infrastructure applications.
This enclosed drive has a rated output power of approximately 355 kW / 500 HP.
The Danfoss 137U3997 operates from a three-phase 380–500 V AC supply.
The drive has an IP54 / UL Type 12 enclosed protection rating for robust industrial installations.
The drive includes Safe Torque Off (STO) and SS1-t functional safety features with fieldbus support.
Danfoss iC7-Automation enclosed drives are used by engineers and plant operators to deliver reliable high-power motor control, efficient operation and flexible integration in demanding industrial systems.
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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...