 eaton-flexpdu-data-sheet-emob0038_en.pdf | [Eaton Bussmann FLEX power distribution unit for electric commercial vehicles] | 913 kB |
Eaton Bussmann FLEX PDU: Specifications, Features and Applications
The Eaton Bussmann FLEX PDU is a high-voltage power distribution solution designed to support the demanding electrical and safety requirements of electric vehicles (EVs) and other high-voltage applications. Combining power distribution, circuit protection, current and voltage monitoring, and intelligent communication, the FLEX PDU helps simplify high-voltage system integration while supporting reliable and efficient vehicle operation.
With an operating input voltage of up to 900 VDC, continuous output current of up to 350 A, and peak current capability of 500 A for 10 minutes at 60°C, the Eaton Bussmann FLEX PDU is designed for applications that require high-power distribution, advanced diagnostics, and coordinated electrical protection.
In this guide, we explore the Eaton Bussmann FLEX PDU specifications, key features, protection capabilities, communication interfaces, and potential applications in electric mobility and high-voltage power systems.
What Is the Eaton Bussmann FLEX PDU?
The Eaton Bussmann FLEX PDU is a flexible power distribution unit designed to manage and distribute high-voltage DC power within an electrical system. It integrates several functions that would otherwise require multiple individual components, including fuse-based protection, current sensing, voltage measurement, temperature monitoring, and communication with vehicle control systems.
The FLEX PDU supports the integration of compatible Eaton Bussmann EVK fuse families and Breaktor technology, helping engineers configure protection for different high-voltage circuit architectures.
Its combination of high-voltage capability, integrated sensing, and CAN-based control makes it a potential solution for electric vehicle battery systems, traction inverters, DC fast-charging architectures, and auxiliary power distribution.
Eaton Bussmann FLEX PDU Specifications
Understanding the technical specifications of the Eaton Bussmann FLEX PDU is essential when evaluating its suitability for a particular application.
Electrical Specifications
| Parameter | Specification | Unit | Notes |
|---|---|---|---|
| Operating input voltage — HV | 0–900 | VDC | Up to 850 V at altitudes of 5,531 m; up to 900 V at altitudes of 2,000 m |
| Operating input voltage — LV | 10–32 | VDC | Low-voltage supply |
| Input reverse-polarity protection | Yes | — | Protects against input polarity reversal |
| Active and passive discharge | Yes | — | Supports discharge functionality |
| Active precharge | Yes | — | Supports controlled precharging |
| Continuous output current on Breaktor channels | 350 | A | Continuous rating |
| Maximum output current on Breaktor channels | 500 | A | Maximum for 10 minutes at 60°C |
| High-voltage interlock loop (HVIL) | Yes | — | Supports high-voltage interlock functionality |
| Short-circuit current protection | 25 kA | — | With the compatible EVK fuse family and Breaktor |
| Reverse-polarity protection | Yes | — | As specified for the applicable circuit |
Important: Voltage, current, and protection ratings must be evaluated against the complete system design, including ambient conditions, altitude, cable sizing, thermal management, and the selected protective devices.
Fuse Configuration and Protection
The FLEX PDU supports configurable high-voltage battery protection through compatible Eaton Bussmann fuse families.
| Feature | Compatibility or specification |
|---|---|
| Battery fuse configurability | Compatible with EVK30, EVK40, and EVK50 Eaton Bussmann fuse families |
| Auxiliary fuse options | EVK10, EVK14, or EVK22, depending on the interface |
| Short-circuit protection | 25 kA with the specified EVK fuse family and Breaktor |
| Breaktor control | Via CAN communication |
This configurable approach allows engineers to select appropriate fuse options according to circuit requirements and system architecture. Final fuse selection should account for operating current, available fault current, voltage rating, interruption characteristics, and coordination with other protective devices.
Key Features of the Eaton Bussmann FLEX PDU
1. High-Voltage DC Power Distribution
The Eaton Bussmann FLEX PDU supports high-voltage input operation up to 900 VDC under the specified altitude conditions. This makes it relevant to high-voltage electric vehicle platforms and other DC power systems requiring substantial power distribution capacity.
The specified altitude limits are important during system design: the maximum input voltage is 850 VDC at altitudes up to 5,531 m and 900 VDC at altitudes up to 2,000 m.
Engineers should confirm the applicable operating limits for the intended installation environment before finalising system requirements.
2. Integrated Breaktor Technology
The FLEX PDU supports Breaktor channels with a continuous output current rating of 350 A and a maximum current of 500 A for 10 minutes at 60°C.
Breaktor control through CAN communication enables integration with vehicle control and diagnostic systems. When paired with the compatible EVK fuse family, the specified short-circuit protection capability is 25 kA.
This combination supports coordinated circuit protection in high-voltage applications. The actual protection performance depends on the selected components and the electrical characteristics of the complete installation.
3. Active Precharge and Discharge
High-voltage systems frequently contain capacitive loads that must be managed during startup and shutdown.
The FLEX PDU incorporates active precharge as well as active and passive discharge functions. Precharge supports controlled energisation of downstream circuits, helping manage inrush current when capacitive loads are connected.
Discharge functionality supports the removal of stored electrical energy under the relevant operating conditions.
These features can help simplify system integration, although the required startup sequence, discharge time, and safety verification must be established for the specific application.
4. Reverse-Polarity Protection
Reverse-polarity protection is specified for the FLEX PDU. This feature helps protect the system against damage associated with incorrect supply polarity under the conditions covered by the product design.
Proper installation, connector selection, wiring verification, and adherence to the manufacturer's instructions remain essential for safe operation.
5. High-Voltage Interlock Loop (HVIL)
The FLEX PDU supports a high-voltage interlock loop (HVIL), a function commonly used in electric vehicles to monitor the integrity of designated high-voltage connections.
HVIL integration can support system-level safety strategies by allowing the vehicle control architecture to respond to relevant interlock conditions.
The specific detection logic and resulting system response depend on the vehicle's electrical design and control strategy.
Integrated Monitoring and Measurement Capabilities
A major advantage of the Eaton Bussmann FLEX PDU is its support for integrated electrical and temperature sensing. These measurement capabilities can provide valuable information for energy management, power distribution, diagnostics, and fault investigation.
Current Sensing
The specified current measurement ranges are:
| Measurement | Minimum | Maximum | Accuracy |
|---|---|---|---|
| Traction inverter and DC fast charging | -1,500 A | +1,500 A | ±3% |
| Auxiliary circuits | -500 A | +500 A | ±3% |
Bidirectional current measurement allows the monitoring system to represent current flowing in either direction within the specified range.
For traction inverter and DC fast-charging applications, the ±1,500 A measurement range provides visibility into high-current operating conditions. Auxiliary current measurement supports monitoring of lower-current circuits.
The stated ±3% accuracy should be considered when calculating power, energy consumption, or current-based diagnostic thresholds.
Voltage Measurement
| Parameter | Specification |
|---|---|
| Measurement range | 200–900 V |
| Accuracy | ±1% |
Voltage measurement supports monitoring of high-voltage system conditions and can provide useful data for vehicle control and diagnostics.
The specified measurement range begins at 200 V, which should be considered when defining monitoring requirements for systems that operate below this threshold.
Temperature Measurement
| Parameter | Specification |
|---|---|
| Measurement range | -30°C to +150°C |
| Accuracy | ±5 K |
Temperature measurement can support thermal monitoring and diagnostic functions. This is particularly relevant in high-power electrical systems where operating temperature affects component performance and protection requirements.
The temperature measurement range should not be confused with the PDU's external ambient operating temperature range.
Environmental and Safety Characteristics
The Eaton Bussmann FLEX PDU is specified for operation across a broad external ambient temperature range.
| Parameter | Specification |
|---|---|
| External ambient temperature | -40°C to +85°C |
| Crash signal | Supported |
| Isolation detection | Upstream and downstream |
| Vibration compliance | ISO 16750-3 |
Wide Operating Temperature Range
An external ambient operating range of -40°C to +85°C supports consideration of the FLEX PDU for applications exposed to cold starts, elevated ambient temperatures, and changing environmental conditions.
System-level thermal design remains necessary to ensure that current and voltage ratings are respected throughout the intended operating range.
Upstream and Downstream Isolation Detection
The FLEX PDU supports isolation detection upstream and downstream. This capability can contribute to monitoring insulation conditions in high-voltage electrical architectures.
Isolation monitoring is an important consideration in electric vehicles, where high-voltage circuits must be designed to meet applicable electrical safety requirements.
The exact monitoring method, thresholds, and diagnostic behaviour should be confirmed in the manufacturer's technical documentation.
Crash Signal Support
Crash signal support allows the FLEX PDU to be considered within vehicle architectures that incorporate crash-related electrical safety strategies.
The required response to a crash event, including any power-disconnection sequence, must be defined by the vehicle manufacturer and validated as part of the complete safety system.
Vibration Resistance
The FLEX PDU is specified as compliant with ISO 16750-3 for vibration-related requirements.
ISO 16750-3 addresses mechanical loads relevant to electrical and electronic equipment used in road vehicles. Compliance with the applicable requirements supports evaluation for automotive installations, subject to confirmation of the exact test conditions and product qualification documentation.
CAN Communication and Diagnostics
The Eaton Bussmann FLEX PDU uses CAN communication based on SAE J1939 to support status reporting, control, and diagnostics.
This communication capability can help integrate the PDU into a vehicle's electronic control architecture, allowing compatible controllers to access relevant system information and coordinate supported functions.
Key communication-related capabilities include:
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Status reporting: Access to supported operating and system-status information.
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Diagnostics: Communication of available diagnostic information to connected controllers.
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Control: CAN-based Breaktor control.
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System integration: Support for communication with compatible vehicle-level control systems.
Engineers should consult the product-specific CAN interface documentation for message identifiers, signal definitions, scaling, timing requirements, diagnostic codes, and supported control commands.
Potential Applications of the Eaton Bussmann FLEX PDU
The FLEX PDU's combination of high-voltage distribution, configurable protection, sensing, and communication makes it relevant to several application areas.
Electric Vehicles and Commercial EVs
High-voltage battery systems, traction inverters, and auxiliary electrical loads require appropriate power distribution and protection. The FLEX PDU's 900 VDC maximum input capability and integrated measurement functions make it a candidate for evaluation in suitable EV architectures.
Traction Inverter Power Systems
Traction inverters require reliable high-voltage DC supply and careful monitoring of operating current. The FLEX PDU's traction-inverter current measurement range of -1,500 A to +1,500 A supports applications where bidirectional current monitoring is required.
DC Fast-Charging Systems
The PDU's specified DC fast-charging current measurement range and high-voltage capabilities may be relevant to vehicle-side charging architectures and other compatible DC power systems.
Application suitability depends on the system topology, charging requirements, and the product's approved operating conditions.
Auxiliary Power Distribution
Configurable auxiliary fuse options, including EVK10, EVK14, and EVK22 depending on the interface, provide flexibility for auxiliary circuit protection.
This can be useful when integrating lower-power electrical loads into a high-voltage vehicle platform.
Why Choose the Eaton Bussmann FLEX PDU?
When comparing high-voltage power distribution solutions, engineers should consider the combined requirements for electrical performance, circuit protection, measurement, communication, and environmental durability.
The Eaton Bussmann FLEX PDU offers several relevant characteristics:
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High-voltage capability: Input operation up to 900 VDC under specified altitude conditions.
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High-current distribution: 350 A continuous output current on Breaktor channels, with up to 500 A for 10 minutes at 60°C.
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Configurable protection: Compatibility with EVK30, EVK40, and EVK50 battery fuse families.
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Integrated sensing: Current, voltage, and temperature measurement capabilities.
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Precharge and discharge functions: Support for managing stored electrical energy and controlled energisation.
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Communication and control: CAN J1939 support for status, reporting, control, and diagnostics.
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Safety-related integration: HVIL, crash signal support, and upstream and downstream isolation detection.
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Automotive environmental considerations: An external ambient temperature range of -40°C to +85°C and specified vibration compliance with ISO 16750-3.
These capabilities can help consolidate several power distribution and monitoring functions within a single solution, subject to the requirements of the target application.
Frequently Asked Questions About the Eaton Bussmann FLEX PDU
What is the maximum input voltage of the Eaton Bussmann FLEX PDU?
The specified maximum input voltage is 900 VDC at altitudes up to 2,000 m. At altitudes up to 5,531 m, the specified maximum is 850 VDC.
What is the maximum output current?
The specified continuous output current on Breaktor channels is 350 A. The maximum current is 500 A for 10 minutes at 60°C.
Which Eaton Bussmann fuse families are compatible?
The battery fuse configuration is compatible with the EVK30, EVK40, and EVK50 fuse families. Auxiliary fuse selection can include EVK10, EVK14, or EVK22, depending on the interface.
Does the FLEX PDU support CAN communication?
Yes. It supports CAN communication using J1939 for status reporting, control, and diagnostics. Breaktor control is also supported via CAN.
Does the FLEX PDU provide current and voltage measurement?
Yes. The specified current sensing ranges are -1,500 A to +1,500 A for traction inverter and DC fast-charging applications, and -500 A to +500 A for auxiliary circuits, both with ±3% accuracy. The voltage measurement range is 200–900 V, with ±1% accuracy.
What is the operating temperature range?
The specified external ambient operating temperature range is -40°C to +85°C. Temperature measurement is specified from -30°C to +150°C, with ±5 K accuracy.
Does the FLEX PDU support isolation detection?
Yes. Isolation detection is specified for both upstream and downstream circuits.
Conclusion
The Eaton Bussmann FLEX PDU is a high-voltage power distribution solution designed to address important requirements in electric vehicle and other high-power DC architectures. Its combination of up to 900 VDC input capability, 350 A continuous Breaktor channel current, configurable Eaton Bussmann fuse options, integrated electrical sensing, CAN J1939 communication, and safety-related monitoring functions makes it a relevant option for engineering teams evaluating high-voltage distribution systems.
When selecting the FLEX PDU, engineers should verify the complete electrical ratings, fuse coordination, altitude restrictions, thermal conditions, communication interface, and safety requirements against the manufacturer's latest technical documentation.
For detailed integration planning, confirm product availability, configuration options, and application-specific requirements with Eaton or an authorised Eaton Bussmann distributor.
