Danfoss 137U0721 iC7-Automation air-cooled frequency converter with 9.2 A current rating, 4.0 kW power rating, 380-500 V AC three phase operation, IP20 open type construction, PROFINET RT communication and STO safety functionality for industrial automation systems.
£1,495.20
The Danfoss 137U0721 is a compact iC7-Automation frequency converter designed for precise motor speed control in industrial automation, machinery and OEM applications. As part of the advanced Danfoss iC7-Automation drive platform, it delivers reliable performance, flexible connectivity and efficient control for modern industrial systems.
This air-cooled frequency converter is built for cabinet-based installation where dependable motor control, industrial communication and functional safety are required. With integrated I/O, PROFINET RT communication and Safe Torque Off functionality, the 137U0721 supports seamless integration into PLC-controlled automation networks.
With a rated current of 9.2 A and a three-phase 380–500 V AC supply, the Danfoss 137U0721 is well suited for small to medium industrial motor applications. Its IP20 / Open Type construction and compact FA02b frame make it ideal for installation inside protected electrical control panels and drive cabinets.
Frequency converters such as the Danfoss 137U0721 regulate AC motor speed by controlling output voltage and frequency. This improves process accuracy, supports energy-efficient operation and helps reduce mechanical stress on motors, pumps, fans, conveyors and driven machinery.
The iC7-Automation platform is developed for industrial applications that require flexible configuration, robust communication and dependable performance. With PROFINET RT connectivity, standard I/O and STO safety functionality, the 137U0721 is well suited to integration with PLCs and modern production systems.
| Power | 4 kW |
|---|---|
| Current | 9.2 A |
| Phase | Three Phase |
| IP Rating | IP20 |
| Series | iC7-Automation |
| Part Number | 137U0721 |
| Model Code | IC7-60FA3N05-09A2E20F2+ACBC+ALDC+BAPR+BDBA+BEF1+BF20+CBX0+DAAU |
| Product Type | Frequency converter |
| Cooling Method | Air-cooled |
| Input Voltage | 380–500 V AC |
| Input Phase | Three-phase |
| Current Rating | 9.2 A |
| Power Rating | 4.0 kW / 5.5 hp |
| Protection Rating | IP20 / Open Type |
| Frame Size | FA02b |
| EMC Category | C2 |
| Control Panel | OPX20 2.8" |
| Standard I/O | 4xDI, 2xDI/O, 2xAI, 1xAO, 2xRO |
| Fieldbus Protocol | PROFINET RT OS7PR |
| Additional Communication | Ethernet port, no protocol |
| Functional Safety | Safe Torque Off (STO), not upgradable |
| Integrated Brake Chopper | Yes |
| DC Terminals | Yes |
| EAN | 5715253689500 |
| Net Weight | approx. 4.58 kg |
| Gross Weight | approx. 5.8 kg |
| EMC Filter | Commercial |
The Danfoss 137U0721 is used to control the speed and performance of three-phase AC motors in industrial automation, machinery and process control applications.
The frequency converter has a 9.2 A current rating, making it suitable for small to medium industrial motor control applications.
The 137U0721 is rated at approximately 4.0 kW / 5.5 hp.
The drive includes PROFINET RT OS7PR fieldbus communication, along with an Ethernet port for industrial automation connectivity.
Yes. The drive includes Safe Torque Off (STO) functional safety, listed as not upgradable for this configuration.
Danfoss iC7-Automation frequency converters are trusted by industrial engineers, OEMs and machine builders for reliable motor control, flexible communication and efficient operation in demanding automation environments.
● Service Agreements
Credit Accounts
Our service agreements are built to support long term procurement relationships. By working closely with engineering teams and procurement departments, we help streamline purchasing processes while ensuring consistent access to critical components and sourcing support when it matters most.
● frequently asked questions
At Led Controls Ltd we help engineers source the right automation and control gear with confidence. below are quick answers to what we are asked most often.
We supply all leading manfacturers in our industry. we offer next day delivery on most poplour products.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
● latest blog
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...