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UMI-S0055 Unitronics UMI 1.5kW Brk Res. 260W, 480V
Unitronics UMI-S0055 braking resistor designed for variable frequency drive applications, featuring 260 W braking power, 250 ohm resistance and compatibility with 380-480 V AC three-phase systems.
£34.21
Why Choose the Unitronics UMI-S0055 Braking Resistor?
The Unitronics UMI-S0055 is a heavy-duty dynamic braking resistor designed for use with compatible Unitronics variable frequency drives (VFDs). Engineered to safely dissipate regenerative energy generated during motor deceleration, it helps improve braking performance, reduce drive stress and prevent DC bus overvoltage faults in demanding industrial environments.
During rapid deceleration, motors generate excess energy that is fed back into the drive. The UMI-S0055 converts this regenerative energy into heat, allowing the drive to maintain stable operation while delivering faster and more controlled stopping performance. This improves machine productivity, operational safety and overall system reliability.
Designed for 380-480 V AC three-phase systems, the UMI-S0055 features a 260 W braking power rating, a 250 Ω resistance value and is suitable for applications using drives rated up to 1.5 kW (2 HP). Its robust industrial construction makes it ideal for automation equipment, manufacturing systems and OEM machinery.
Key Advantages
- Improves dynamic braking performance in VFD applications.
- Helps prevent DC bus overvoltage conditions during deceleration.
- 260 W braking power rating for efficient energy dissipation.
- Compatible with 380-480 V AC three-phase systems.
- Suitable for drives rated up to 1.5 kW / 2 HP.
- Industrial-grade construction for reliable long-term operation.
Key Features
- Unitronics UMI braking resistor series.
- 260 W braking power.
- 1.5 kW (2 HP) drive compatibility.
- 250 Ω resistance value.
- 380-480 V AC three-phase operation.
- Designed for regenerative energy dissipation.
- Compact industrial installation design.
- Suitable for automation and machine-building applications.
Reliable Dynamic Braking for Variable Speed Drives
Braking resistors are essential components in variable frequency drive systems where motors frequently decelerate. During braking, regenerative energy is returned to the drive DC bus. The UMI-S0055 safely dissipates this excess energy, helping maintain stable drive operation while enabling faster and more controlled stopping performance.
This improves machine productivity, protects drive electronics and enhances operational safety in applications requiring rapid speed changes, frequent stopping cycles or precise motor control.
Typical Applications
- Conveyor and material handling systems.
- Packaging and production machinery.
- Industrial fans and pumps.
- Machine tools and automation equipment.
- OEM machinery and manufacturing systems.
- Industrial process control applications.
Technical Specifications
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| Coil / Supply Voltage | 380–480 V AC | |
|---|---|---|
| Device Type | Drive / Servo Accessory | |
| Product Series | Unitronics Servo / Drives | |
| Power | 1.5 kW | |
| Voltage | 480 V | |
| Phase | Three Phase | |
| Product type | Braking resistor | |
| Braking power | 260 W | |
| Rated power | 1.5 kW | |
| Motor rating | 2 HP | |
| Resistance | 250 Ω | |
| Supply voltage | 380-480 V AC | |
| Nominal voltage | 400 V AC | |
| Phase compatibility | Three-phase | |
| Dimensions (H × W × D) | Approx. 215 × 60 × 30 mm | |
| Application | Dynamic braking for VFD systems | |
| Mounting | Industrial panel installation |
Frequently Asked Questions
What is the Unitronics UMI-S0055 used for?
The UMI-S0055 is a braking resistor used with compatible variable frequency drives to dissipate regenerative energy generated during motor deceleration.
What braking power does the resistor provide?
The resistor provides a 260 W braking power rating.
What drive size is it suitable for?
The UMI-S0055 is designed for applications using drives rated up to approximately 1.5 kW (2 HP).
What is the resistance value?
The braking resistor has a nominal resistance value of 250 Ω.
What supply voltage is supported?
The UMI-S0055 is designed for use with 380-480 V AC three-phase drive systems.
Trusted for Reliable Drive Braking Performance
Unitronics braking resistors are widely used in industrial automation systems to improve deceleration performance, protect VFDs from overvoltage conditions and enhance machine control during demanding operating cycles.
