FR-UK33 GEL Series Industrial Transformer-Based UPS 20–200 kVA
Three-Phase Input / Three-Phase Output
The Kehua FR-UK33 GEL Series is an industrial-grade, transformer-based online UPS engineered to provide highly reliable power protection for critical industrial equipment, motor loads, harsh environments, and demanding commercial applications.
Available from 20 kVA to 200 kVA, the FR-UK33 GEL Series combines advanced IGBT rectification technology, full output isolation, conformal-coated PCB assemblies, electromagnetic shielding, and robust thermal management to deliver dependable operation under challenging electrical and environmental conditions.
Unlike conventional commercial UPS systems, the FR-UK33 GEL Series is specifically designed to support demanding industrial loads and unstable utility conditions. Its rugged architecture makes it suitable for applications such as glass fiber manufacturing, semiconductor facilities, metal smelting, petrochemical plants, process industries, industrial automation, and other mission-critical installations.
Key Features
- Industrial Transformer-Based Design – Integrated output isolation transformer provides complete electrical isolation between the UPS output and upstream power supply.
- Advanced IGBT Rectifier Technology – Proven three-phase six-switch IGBT rectification provides excellent grid adaptability and reliable performance in demanding industrial environments.
- Excellent Grid Adaptability – Designed to operate reliably with unstable utility supplies, temporary industrial power sources, and generator systems.
- Stable & Accurate Output – Precise output voltage regulation and strong dynamic response help maintain reliable power for sensitive and demanding loads.
- Conformal-Coated PCB Assemblies – Enhanced protection of electronic circuits improves reliability in dusty, humid, and challenging industrial environments.
- Electromagnetic Shielding Design – Advanced EMC protection helps minimize electromagnetic interference and protects critical control circuits.
- Energy Back-Feed Handling – Designed to accommodate regenerative energy from certain dynamic or motor-type loads by allowing energy to be returned toward the upstream supply under appropriate operating conditions.
- Redundant Control Power Supplies – Multiple internal control power supplies provide additional redundancy to improve overall system availability.
- Independent Ventilation Architecture – Optimized airflow design improves cooling performance and protects critical internal components from excessive thermal stress.
- Maintenance-Friendly Construction – System architecture is designed to simplify inspection, servicing, and maintenance in industrial installations.
Full Output Isolation
The FR-UK33 GEL Series incorporates an output isolation transformer, providing galvanic separation between the protected load and the upstream electrical supply.
This full-isolation architecture helps establish a clean and stable power reference on the output side and can support the creation of a local neutral-to-earth reference, depending on the site electrical design and grounding requirements.
Key benefits include:
Electrical Isolation • Improved Noise Rejection • Stable Neutral Reference • Enhanced Load Protection • Greater Industrial System Compatibility
The isolation transformer also helps protect sensitive downstream equipment against electrical disturbances and common-mode interference originating from the upstream power network.
Superior Power Grid Adaptability
The rectifier utilizes mature three-phase six-switch IGBT technology, designed to provide stable operation even when the incoming power source is subject to significant voltage or frequency disturbances.
Its strong dynamic response and stable output regulation help prevent unnecessary transfers between mains and battery operation.
This is particularly beneficial when the UPS is supplied from:
Unstable Utility Networks • Diesel Generators • Temporary Industrial Power • Weak Electrical Grids • Industrial Distribution Systems
Reducing unnecessary battery transfers can help preserve battery capacity and extend overall battery service life.
Electromagnetic Shielding & EMC Protection
The FR-UK33 GEL Series incorporates professional electromagnetic compatibility and shielding design to reduce the influence of electromagnetic disturbances on both the UPS and connected equipment.
Important control circuits are protected within an electromagnetic shielding architecture, improving immunity to electrical interference in demanding industrial environments.
This makes the UPS suitable for applications involving:
High-Frequency Communication Systems • Industrial Control Equipment • Broadcasting Systems • Audio & Video Systems • Sensitive Electronic Equipment
The design helps minimize electrical interference and maintain high-quality power for sensitive critical loads.
Energy Back-Feed Protection
Certain industrial loads, particularly motors, drives, and other dynamic loads, can return regenerative energy toward the UPS during rapid deceleration or sudden operating changes.
The FR-UK33 GEL Series is designed to accommodate these conditions by allowing suitable regenerative energy to be handled through the rectifier and returned toward the upstream electrical system.
This helps reduce electrical stress on the UPS DC bus and provides enhanced compatibility with demanding industrial and regenerative-load applications.
Redundant Power Supply Design
The FR-UK33 GEL Series incorporates a redundant internal control power architecture, with multiple power supplies providing backup for critical UPS control functions.
If one or more control power paths become unavailable, the remaining supply architecture is designed to maintain critical UPS operation within the supported redundancy conditions.
This additional redundancy improves overall system resilience and helps maintain uninterrupted power to mission-critical loads.
Independent Ventilation & Thermal Management
The UPS incorporates an optimized front-to-top airflow design to improve internal cooling and promote efficient heat removal.
The ventilation architecture is designed to:
- Minimize uneven heat distribution
- Reduce localized hot spots
- Improve heat dissipation from critical components
- Protect power semiconductors and control electronics
- Extend component and system service life
- Improve reliability under continuous industrial operation
The upward airflow arrangement follows the natural movement of heated air, supporting more efficient thermal management within the UPS cabinet.
Energy-Efficient Thermal Design
The FR-UK33 GEL Series thermal architecture is developed using detailed analysis of:
Heat Radiation • Heat Conduction • Heat Convection • Air Temperature • Air Pressure • Air Velocity • Airflow Direction
This comprehensive thermal design approach helps optimize cooling performance while reducing unnecessary energy consumption.
Effective thermal management also contributes to longer component life and improved system reliability.
Maintenance-Friendly Design
The FR-UK33 GEL Series is designed with serviceability in mind, helping simplify routine inspection and maintenance in industrial environments.
Its optimized airflow arrangement and internal component architecture provide practical access to critical system components while helping maintain effective separation between cooling paths and sensitive electronics.
This service-oriented approach helps reduce maintenance complexity and supports long-term system availability.
Applications
Ideal for:
Petrochemical Plants • Semiconductor Manufacturing • Glass & Glass-Fiber Manufacturing • Metal Smelting • Process Industries • Industrial Automation • Motor Loads • Manufacturing Facilities • Oil & Gas Facilities • Telecommunications • Broadcasting Systems • Critical Infrastructure • Other Harsh Industrial Environments
Key Benefits
Industrial Transformer-Based Architecture • 20–200 kVA Range • Full Output Isolation • IGBT Rectification • Superior Grid Adaptability • Motor Load Compatibility • Regenerative Energy Handling • Conformal-Coated PCB • Electromagnetic Shielding • Redundant Internal Power Supply • Independent Ventilation • Advanced Thermal Management • High Reliability in Harsh Environments
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