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UMI-S0409 Unitronics UMI-B7, 5.5kW Brk Res.1000W, 480V
MPN: UMI-S0409
Alt. SKU: UMIS0409
Special Price
£26.77
£22.31
Regular Price
£31.50
Why Choose the Unitronics UMI-S0409 Braking Resistor?
The Unitronics UMI-S0409 is a dynamic braking resistor designed for use with Unitronics variable frequency drives (VFDs) operating on 400–480 V three-phase systems. It safely dissipates regenerative energy generated during rapid motor deceleration, helping prevent DC bus over-voltage faults and maintaining stable drive operation.
During motor braking or rapid deceleration, rotational energy is fed back into the drive’s DC bus. Without proper dissipation this energy can cause voltage spikes and inverter shutdowns. Braking resistors such as the UMI-S0409 convert this excess energy into heat, allowing controlled deceleration and protecting the drive system from faults.
The UMI-S0409 is designed for drives controlling motors around 5.5 kW (7.5 HP) on 400–480 V systems. It provides approximately 85 Ω resistance with a braking power rating of about 1000 W, making it suitable for demanding industrial automation and motion control applications.
Key Features
- Dynamic braking resistor for Unitronics VFD systems.
- Designed for 400–480 V three-phase drive installations.
- 85 Ω resistance for controlled energy dissipation.
- Approx. 1000 W braking power rating.
- Suitable for motors around 5.5 kW (7.5 HP).
- Helps prevent DC bus over-voltage during rapid deceleration.
Technical Specifications
- Manufacturer: Unitronics
- Model: UMI-S0409
- Product type: Braking resistor
- Resistance: approx. 85 Ω
- Braking power: approx. 1000 W
- Compatible motor power: approx. 5.5 kW (7.5 HP)
- Input system: 400–480 V three-phase VFD systems
- Function: Dissipates regenerative energy during motor braking
Typical Applications
- Variable frequency drive motor braking systems.
- Industrial automation and motion control equipment.
- Conveyor and material handling systems.
- Machine tools and automated production machinery.
- Packaging and process equipment.
Frequently Asked Questions
What is the UMI-S0409 used for?
The UMI-S0409 is a braking resistor used with Unitronics VFDs to dissipate regenerative energy produced when a motor decelerates.
Why are braking resistors used in VFD systems?
When a motor slows down it generates energy that flows back into the drive. A braking resistor converts this energy into heat to prevent over-voltage faults and protect the inverter.
What motor size is the UMI-S0409 designed for?
This braking resistor is typically used with drives controlling motors around 5.5 kW (7.5 HP) on 400–480 V systems.
What resistance value does the UMI-S0409 provide?
The resistor provides approximately 85 Ω resistance with a braking power rating of around 1000 W.
Trusted by Automation Engineers
Braking resistors are essential components in VFD installations, enabling controlled motor deceleration and protecting drives from regenerative over-voltage.
| Packed Quantity | 1 |
|---|---|
| Manufacturer | Unitronics |
| Manufacturer Part Number | UMI-S0409 |
| Alternative Product SKU | UMIS0409 |
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