 eaton-ev-fuse-catalogue-emob0062-en-us.pdf | [Eaton Bussmann EV Fuses] | 0 kB |
Eaton Bussmann EVKR 50 mm Fuses: High-Performance Protection for Electric Vehicle Battery Systems
As electric vehicles (EVs) continue to evolve, reliable electrical protection is essential for battery systems operating at higher voltages and currents. The Eaton Bussmann EVKR 50 mm fuses are designed to support the demanding protection requirements of high-capacity EV battery packs, helping safeguard critical electrical components while supporting efficient system design.
Available in 350 A and 400 A ratings, the EVKR series combines a high interrupting rating with a compact 50 mm fuse format. These fuses are suitable for engineers and manufacturers seeking robust circuit protection solutions for modern electric vehicle applications.
What Are Eaton Bussmann EVKR 50 mm Fuses?
The Eaton Bussmann EVKR 50 mm fuse series is designed for high-current applications in electric vehicle battery systems. Its higher voltage rating supports the needs of higher-voltage battery packs, while its high breaking capacity helps address the fault currents associated with high-capacity batteries.
The series is available in two configurations:
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EVKR50-350: 350 A rated current
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EVKR50-400: 400 A rated current
Both variants feature an M10 screw connection, making them suitable for electrical assemblies designed around this mounting interface. Each fuse is supplied in packaging quantities of 22 units per box.
Key Features and Benefits of EVKR 50 mm Fuses
1. Higher Voltage Rating for Improved System Efficiency
Higher-voltage EV battery architectures can help reduce current for a given power requirement. This can enable the use of smaller, more economical conductors when the complete electrical system is appropriately designed.
The higher voltage rating of Eaton Bussmann EVKR 50 mm fuses supports the requirements of higher-voltage battery packs, helping engineers optimise system efficiency and conductor sizing.
2. High Interrupting Capacity of 50 kA
Battery systems can deliver substantial fault currents, particularly when connected to high-capacity energy storage. Effective fuse protection is therefore essential for managing electrical faults and protecting connected equipment.
The EVKR 50 mm series offers a maximum breaking capacity of 50 kA, providing a high interrupting rating for demanding battery applications. Correct selection requires checking the prospective fault current and the electrical characteristics of the intended application.
3. Designed for High-Current EV Applications
With rated current options of 350 A and 400 A, the EVKR series provides flexibility when designing high-current electrical protection for electric vehicle systems.
Selecting the appropriate current rating depends on factors such as normal operating current, transient conditions, ambient temperature, conductor sizing and the requirements of the overall protection system.
4. Compliance with Environmental Requirements
Eaton Bussmann EVKR 50 mm fuses are listed as compliant with the following environmental requirements:
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RoHS
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ELV (End-of-Life Vehicles)
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REACH
These compliance declarations help support component selection for automotive and electrical equipment supply chains. Always consult the manufacturer's current documentation for the applicable declarations and product-specific requirements.
5. Standards-Based Design
The EVKR 50 mm fuse series is designed with reference to the following standards:
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ISO 8820-8
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GB/T 31465.6
These standards provide relevant technical references for automotive fuse design and application. Engineers should verify the applicable standard editions and product documentation when incorporating the fuses into a new design.
Eaton Bussmann EVKR 50 mm Fuse Technical Specifications
The following table summarises the available technical information for the EVKR 50 mm fuse series.
| Technical parameter | Specification |
|---|---|
| Product series | Eaton Bussmann EVKR |
| Fuse size | 50 mm |
| Maximum breaking capacity | 50 kA |
| Minimum breaking capacity | 300% of rated current (In) |
| Screw type | M10 |
| Packaging quantity | 22 units per box |
| Weight per fuse | 0.402 kg |
| Storage temperature | −40°C to +85°C |
| Torque limit | 20 ± 1 Nm |
| Environmental compliance | RoHS, ELV and REACH |
| Design standards (reference) | ISO 8820-8 and GB/T 31465.6 |
Important: The maximum operating voltage, time-current characteristics, dimensions and other application-specific parameters should be confirmed against the latest official Eaton datasheet before selecting or installing a fuse.
Available Eaton Bussmann EVKR 50 mm Fuse Models
The EVKR series offers two current ratings to accommodate different electrical design requirements.
| Part number | Rated current | Packaging quantity | Screw type | Weight | Storage temperature | Torque limit |
|---|---|---|---|---|---|---|
| EVKR50-350 | 350 A | 22 per box | M10 | 0.402 kg | −40°C to +85°C | 20 ± 1 Nm |
| EVKR50-400 | 400 A | 22 per box | M10 | 0.402 kg | −40°C to +85°C | 20 ± 1 Nm |
EVKR50-350 – 350 A Fuse
The Eaton Bussmann EVKR50-350 is the 350 A option within the EVKR 50 mm series. It is intended for applications where the selected protection rating aligns with the battery system's normal operating current, fault conditions and coordination requirements.
Before installation, engineers should verify that its voltage rating, interrupting performance and time-current characteristics are suitable for the intended circuit.
EVKR50-400 – 400 A Fuse
The Eaton Bussmann EVKR50-400 provides a 400 A rated-current option for applications requiring a higher nominal current rating.
As with the 350 A version, the fuse must be selected according to the system's operating conditions, available fault current, conductor capacity and protection coordination requirements.
How to Choose Between EVKR50-350 and EVKR50-400
Choosing between the two Eaton Bussmann EVKR 50 mm fuse models involves more than comparing their rated currents.
Consider the following factors:
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Continuous operating current: Determine the expected current under normal operating conditions, including relevant thermal derating.
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System voltage: Confirm that the fuse's rated voltage is appropriate for the maximum voltage of the battery system.
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Prospective fault current: Ensure the fuse's breaking capacity is sufficient for the maximum fault current that could occur at its installation point.
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Time-current performance: Check that the fuse can accommodate expected operating transients while providing the required fault protection.
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Connection requirements: Verify the M10 mounting arrangement and follow the specified torque of 20 ± 1 Nm.
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Environmental conditions: Assess the actual operating temperature, vibration exposure and other application-specific requirements using the manufacturer's documentation.
A 400 A fuse is not automatically the better choice for a system that normally operates at a lower current. The correct rating must provide suitable protection without compromising normal operation.
Typical Applications of EVKR 50 mm Fuses
The Eaton Bussmann EVKR series is designed around the needs of higher-voltage, high-capacity electric vehicle battery systems.
Potential application areas to evaluate include:
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Electric vehicle battery pack protection
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High-current battery distribution circuits
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Battery-powered vehicle electrical systems
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High-voltage EV power distribution assemblies
Final suitability depends on the complete electrical design, including the system voltage, available fault current, circuit topology and applicable automotive safety requirements. Confirm the manufacturer's approved applications before specifying the component.
Installation and Handling Considerations
Correct installation is essential to achieving the intended performance of a high-current fuse.
For the EVKR 50 mm series, observe the following considerations:
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Use the specified M10 screw connection.
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Apply the stated torque of 20 ± 1 Nm, following the manufacturer's installation instructions.
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Store the fuses within the specified temperature range of −40°C to +85°C.
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Inspect the mounting interface and electrical connections for suitability before installation.
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Confirm that the fuse's voltage rating, interrupting capacity and time-current characteristics match the application.
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Follow appropriate isolation, electrical safety and battery-system servicing procedures.
The stated storage temperature is not necessarily the permissible operating temperature. Consult the official product documentation for the operating-temperature range and any additional installation restrictions.
Why Choose Eaton Bussmann EVKR 50 mm Fuses?
Eaton Bussmann EVKR 50 mm fuses offer a combination of high-current ratings, a 50 kA maximum breaking capacity and a design intended to support higher-voltage EV battery systems.
With 350 A and 400 A options, an M10 screw connection and documented environmental compliance, the series provides engineers with two configurations to assess when developing high-current battery protection systems.
The choice of fuse should always be based on verified technical specifications and the requirements of the complete electrical installation.
Frequently Asked Questions About Eaton Bussmann EVKR 50 mm Fuses
What is the breaking capacity of Eaton Bussmann EVKR 50 mm fuses?
The EVKR 50 mm series has a specified maximum breaking capacity of 50 kA. The minimum breaking capacity is specified as 300% of the rated current (In).
What current ratings are available?
The series includes two models: the EVKR50-350, rated at 350 A, and the EVKR50-400, rated at 400 A.
What screw connection do EVKR 50 mm fuses use?
Both models use an M10 screw connection. The specified torque limit is 20 ± 1 Nm.
What is the storage temperature range?
The specified storage temperature range is −40°C to +85°C. Refer to the manufacturer's documentation for the permitted operating temperature.
Which standards are referenced for the EVKR series?
The listed design standards are ISO 8820-8 and GB/T 31465.6. Consult the current Eaton documentation to confirm the applicable requirements for a specific installation.
Are Eaton Bussmann EVKR 50 mm fuses RoHS compliant?
Yes. The supplied product information lists the EVKR series as RoHS, ELV and REACH compliant. Current product-specific declarations should be checked when documentation is required for procurement or regulatory purposes.
Conclusion
The Eaton Bussmann EVKR 50 mm fuse series is designed to address the circuit protection requirements of high-current, higher-voltage electric vehicle battery systems. With 350 A and 400 A models, a maximum breaking capacity of 50 kA and an M10 screw connection, the series offers options for engineers developing modern EV electrical architectures.
Whether you are evaluating the EVKR50-350 or EVKR50-400, verify the complete electrical specifications and installation requirements before making a final selection.
Looking for Eaton Bussmann EVKR 50 mm fuses? Compare the EVKR50-350 and EVKR50-400 specifications to identify the appropriate model for your battery protection application.
