Danfoss 137N9721 iC7-Automation air-cooled frequency converter with 736 A output current, three-phase 380-500 V AC supply, PROFINET RT communication, Safe Torque Off functionality and IP54 / UL Type 12 protection.
£35,927.20
The Danfoss 137N9721 is a high-performance iC7-Automation frequency converter designed for demanding industrial motor control applications requiring high output capacity, robust protection and advanced automation connectivity. Built as an air-cooled variable frequency drive, it provides precise speed and torque control for large three-phase motors in process, manufacturing and infrastructure environments.
As part of the Danfoss iC7-Automation series, this frequency converter combines efficient power conversion with flexible communication and control features. Its PROFINET RT fieldbus capability, Ethernet connectivity and standard I/O configuration make it suitable for integration into PLC-based systems, automation networks and industrial control panels.
With a 380–500 V AC three-phase supply and a substantial 736 A output current rating, the 137N9721 is ideal for high-power machinery, pumps, fans, compressors and production systems. The IP54 / UL Type 12 enclosure provides enhanced protection for demanding industrial installations.
Frequency converters such as the Danfoss 137N9721 regulate motor speed by adjusting output voltage and frequency. This allows industrial equipment to operate more efficiently, improve process accuracy and reduce mechanical stress on motors, pumps, fans and connected machinery.
The iC7-Automation platform is designed for demanding automation environments where precise control, robust connectivity and dependable operation are essential. With PROFINET RT communication, standard I/O and integrated safety functionality, the 137N9721 supports straightforward integration into modern industrial control systems.
| Power | 400 kW |
|---|---|
| Current | 736 A |
| Phase | Three Phase |
| IP Rating | IP54 |
| Series | iC7-Automation |
| Product type | Frequency converter / variable frequency drive |
| Catalogue number | 7FC-AUFA3N05-736AE54F3-000139500 |
| Model code | IC7-60FA3N05-736AE54F3+AGCX+AJFD+AMMX+BAPR+BDBA+BEF1+BF20+DAAU |
| Input voltage | 380–500 V AC |
| Input phases | Three-phase |
| Rated output current | 736 A |
| Cooling method | Air cooled |
| Protection rating | IP54 / UL Type 12 |
| EMC category | C3 |
| Frame size | FB11 |
| Control panel | 2.8 OPX20 |
| Digital inputs | 4 x DI |
| Configurable digital I/O | 2 x DI/O |
| Analogue inputs | 2 x AI |
| Analogue outputs | 1 x AO |
| Relay outputs | 2 x RO |
| Fieldbus protocol | PROFINET RT OS7PR |
| Other communication | Ethernet port, no protocol |
| Functional safety | Safe Torque Off (STO), not upgradable |
| Dimensions | approx. 602 × 2043 × 510 mm |
| Weight | approx. 205.8 kg |
| EMC Filter | Industrial |
The Danfoss 137N9721 is used to control the speed and torque of large three-phase AC motors in industrial automation, process control and high-power machinery applications.
The drive has a rated output current of 736 A, making it suitable for demanding high-capacity motor control systems.
The Danfoss 137N9721 operates from a three-phase 380–500 V AC supply.
This configuration includes PROFINET RT OS7PR fieldbus communication and an Ethernet port for industrial connectivity.
Yes, the drive includes integrated Safe Torque Off (STO) functionality, listed as not upgradable for this configuration.
Danfoss iC7-Automation frequency converters are trusted by engineers, OEMs and industrial operators for dependable high-power motor control, advanced connectivity and reliable performance in demanding automation environments.
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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...