Fuji Electric CR6L-250/UL | High-Reliability 250A Three-Phase Diode Rectifier Module
The Fuji Electric CR6L-250/UL is an engineering cornerstone for high-power AC-to-DC conversion, designed for applications where reliability is not just a feature, but a fundamental requirement. As a six-pack diode module, it integrates a full three-phase bridge rectifier into a single, robust, and electrically isolated package. This component is engineered by Fuji Electric, a name synonymous with quality in power electronics, to serve as the unwavering front-end for demanding industrial systems.
Key Performance Highlights
The CR6L-250/UL is built to deliver consistent performance and simplify system design. Its value is rooted in these core characteristics:
- Integrated Three-Phase Bridge: Contains six diodes in a 3-phase bridge configuration, drastically reducing component count, simplifying PCB layout, and minimizing assembly time and potential wiring errors compared to discrete solutions.
- High Current Capability: With a 250A average forward current rating, this module is built to handle substantial loads, making it ideal for machinery and systems in the multi-kilowatt range.
- UL Recognized (File E102223): This certification is a critical asset, streamlining the safety approval process for final equipment destined for North American markets and assuring compliance with stringent safety standards.
- Excellent Thermal Performance: The module features an electrically isolated baseplate, allowing it to be mounted directly to a common heatsink with other components, simplifying overall system thermal management and improving heat dissipation.
Key Parameter Overview
Engineers require precise data for design and simulation. The following table outlines the critical electrical and thermal parameters of the Fuji Electric CR6L-250/UL. For comprehensive data including characteristic curves, please consult the official Fuji Electric datasheets for this series.
| Parameter | Value |
|---|---|
| Repetitive Peak Reverse Voltage (VRRM) | 1600 V |
| Average Forward Current (IF(AV)) | 250 A |
| Surge Forward Current (IFSM) | 4000 A (50Hz/60Hz, 1 cycle) |
| Peak Forward Voltage (VFM) | 1.35 V (Typ.) |
| Operating Junction Temperature (Tj op) | -40 to +150 °C |
| Isolation Voltage (Visol) | 2500 V (AC, 1 minute) |
Application Scenarios & Engineering Value
The CR6L-250/UL excels as the input rectifier stage in a variety of high-power applications, translating its technical features into tangible system-level benefits.
- Variable Frequency Drives (VFDs): It provides a stable and robust DC bus, the critical power source for the inverter stage. Its high surge tolerance and thermal stability ensure uninterrupted operation of motor drives even under demanding start-up or load-change conditions. This reliable front-end is essential for the overall performance of the IGBTs in inverter ACs that control the motor.
- Large-Scale UPS Systems: In an uninterruptible power supply, the rectifier's role is non-negotiable. The CR6L-250/UL ensures efficient and reliable conversion of mains AC power to charge the battery bank and supply the inverter, guaranteeing system readiness and uptime.
- Industrial Welding Power Supplies: Welding applications subject components to high current pulses and significant thermal stress. This module's robust construction and superior thermal cycling capability ensure long operational life in the harsh electrical environment of a professional welding power supply.
- Battery Chargers and DC Power Sources: For high-capacity industrial battery charging systems or bulk DC power supplies, this module offers a compact, reliable, and easy-to-implement solution for the main power conversion stage.
Engineer's FAQ for the CR6L-250/UL
Our experts address common design questions regarding the implementation of this powerful diode module.
- What are the most critical mounting considerations?Proper thermal contact is paramount. Ensure the heatsink surface is flat (typically within 50µm) and clean. Use a high-quality Thermal Interface Material (TIM) and apply the recommended mounting torque evenly across all terminals to minimize thermal resistance and prevent mechanical stress on the ceramic substrate.
- Can two CR6L-250/UL modules be paralleled for a 500A rectifier?Paralleling is possible but requires careful design. To ensure proper current sharing, it's advisable to use modules from the same manufacturing batch to have closely matched forward voltage (V_F) characteristics. Furthermore, the physical layout of the busbars must be perfectly symmetrical to equalize stray inductance and resistance, preventing one module from carrying a disproportionate share of the current.
For detailed application support or to discuss sourcing the CR6L-250/UL for your next project, please contact our technical team for expert guidance.
