 eaton-ev-fuse-catalogue-emob0062-en-us.pdf | [Eaton EV Fuses] | 0 kB |
Eaton Bussmann EVKR 14 mm Fuses: 1000 VDC Protection for Electric Vehicle Battery Systems
Introduction
As electric vehicles (EVs) and high-voltage battery technologies continue to evolve, reliable circuit protection is essential for improving electrical safety, system performance and overall efficiency. The Eaton Bussmann EVKR 14 mm fuses are designed for high-voltage direct current (DC) applications, offering a rated voltage of 1000 VDC and current ratings from 35 A to 50 A.
Designed to support the demanding requirements of high-capacity battery packs, the EVKR fuse series combines a high interrupting rating with compact 14 mm fuse construction. These characteristics make the range a potential solution for engineers and manufacturers developing electric vehicle power systems and other compatible high-voltage DC applications.
In this guide, we explore the key features, technical specifications, available part numbers and selection considerations for Eaton Bussmann EVKR 14 mm fuses.
What Are Eaton Bussmann EVKR 14 mm Fuses?
Eaton Bussmann EVKR 14 mm fuses are high-voltage DC circuit protection components designed for applications requiring dependable overcurrent protection. With a rated voltage of 1000 VDC and a maximum breaking capacity of 25 kA, the series is intended to address the protection requirements associated with high-capacity battery systems.
Modern electric vehicles rely on battery packs capable of delivering substantial electrical power for acceleration, driving range and other vehicle functions. Protecting these systems requires fuses with appropriate voltage, current and fault-interruption capabilities.
The EVKR series offers three rated-current options:
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EVKR14-35-T: 35 A
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EVKR14-40-T: 40 A
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EVKR14-50-T: 50 A
Each variant uses an M8 screw connection and is supplied in packaging quantities of 100 units per box, making the range suitable for manufacturers, distributors and industrial procurement teams.
Key Features and Benefits of EVKR 14 mm Fuses
1. High 1000 VDC Rated Voltage
One of the main characteristics of the Eaton Bussmann EVKR fuse series is its 1000 VDC rated voltage.
Higher-voltage battery architectures can help improve overall electrical system efficiency by reducing current for a given power level. This can allow the use of smaller, more economical conductors when the complete system is appropriately designed.
The EVKR series is intended to support the protection requirements of higher-voltage battery packs. Selecting a fuse with a suitable DC voltage rating is essential because interrupting a DC fault presents different challenges from interrupting an AC fault.
2. Maximum Breaking Capacity of 25 kA
The EVKR 14 mm fuse series has a maximum breaking capacity of 25 kA.
Breaking capacity indicates the maximum prospective fault current a fuse can safely interrupt under its specified operating conditions. This specification is particularly important in high-capacity battery systems, where available fault currents can be substantial.
A high interrupting rating helps address the protection needs of battery packs designed to deliver the power required for vehicle acceleration and driving range.
The specified 25 kA rating should be assessed alongside the system voltage, prospective short-circuit current and applicable installation conditions to ensure the selected fuse is suitable for the intended application.
3. Current Ratings from 35 A to 50 A
The Eaton Bussmann EVKR 14 mm fuse family includes three current ratings: 35 A, 40 A and 50 A.
This range gives designers flexibility when selecting circuit protection for different electrical loads and system configurations.
The appropriate rating depends on several factors, including:
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Normal operating current and expected load variations
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Conductor ampacity and wiring configuration
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Ambient and operating temperatures
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Available fault current
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Fuse time-current characteristics and coordination with other protective devices
A fuse should not be selected solely by matching its rated current to the nominal operating current. The complete circuit and the manufacturer's applicable selection guidance must also be considered.
4. Compact 14 mm Construction with M8 Connections
The EVKR series features a 14 mm fuse format and M8 screw connections.
This configuration provides a defined mounting interface for compatible electrical assemblies. The M8 connection specification is particularly relevant during component selection, mechanical integration and assembly planning.
For reliable installation, engineers should verify terminal compatibility, mounting clearances, connection hardware and the manufacturer's specified tightening torque.
The recommended torque for the listed EVKR variants is 12 ± 1 Nm.
5. Compliance with Environmental Requirements
According to the supplied technical information, Eaton Bussmann EVKR 14 mm fuses are compliant with:
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RoHS
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ELV
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REACH
These environmental and chemical-substance requirements are relevant to manufacturers sourcing electrical components for automotive and industrial supply chains.
The series is also designed with reference to ISO 8820-8 and GB/T 31465.6. These standards should be considered when assessing suitability for a particular application and its regulatory requirements.
Eaton Bussmann EVKR 14 mm Fuse Specifications
The following table summarises the main technical data for the EVKR 14 mm fuse series.
| Specification | Technical details |
|---|---|
| Product series | Eaton Bussmann EVKR 14 mm |
| Rated voltage | 1000 VDC |
| Rated current range | 35 A–50 A |
| Maximum breaking capacity | 25 kA |
| Minimum breaking capacity | 200% of rated current |
| Fuse format | 14 mm |
| Screw type | M8 |
| Packaging quantity | 100 units per box |
| Weight | 0.125 kg, as specified in the supplied catalogue data |
| Storage temperature | −40°C to +85°C |
| Recommended torque | 12 ± 1 Nm |
| Time constant | Not specified in the supplied datasheet information |
| Environmental compliance | RoHS, ELV and REACH |
| Referenced standards | ISO 8820-8 and GB/T 31465.6 |
Important: The supplied data does not specify the fuse time constant. Consult the manufacturer's current datasheet for additional electrical characteristics, including time-current curves and any application-specific qualification requirements.
Eaton Bussmann EVKR 14 mm Fuse Part Numbers
The EVKR series is available in three catalogue variants, differentiated by their rated current.
| Part number | Rated current | Packaging | Screw type | Weight | Storage temperature | Torque |
|---|---|---|---|---|---|---|
| EVKR14-35-T | 35 A | 100/box | M8 | 0.125 kg | −40°C to +85°C | 12 ± 1 Nm |
| EVKR14-40-T | 40 A | 100/box | M8 | 0.125 kg | −40°C to +85°C | 12 ± 1 Nm |
| EVKR14-50-T | 50 A | 100/box | M8 | 0.125 kg | −40°C to +85°C | 12 ± 1 Nm |
These part numbers make it easier for purchasing teams and engineers to identify the required current rating when specifying replacement components or designing new electrical assemblies.
Before ordering, confirm the exact part number against the required electrical characteristics, mounting arrangement and manufacturer documentation.
Understanding the Minimum Breaking Capacity
The supplied technical data lists a minimum breaking capacity of 200% of the rated current.
This corresponds to the following current values:
| Fuse part number | Rated current | 200% of rated current |
|---|---|---|
| EVKR14-35-T | 35 A | 70 A |
| EVKR14-40-T | 40 A | 80 A |
| EVKR14-50-T | 50 A | 100 A |
These figures are calculated directly from the supplied rating information. They should not be confused with the maximum breaking capacity of 25 kA, which describes a different aspect of fuse performance.
For application engineering, consult the manufacturer's documentation to confirm the precise test conditions and interpretation of the minimum breaking capacity specification.
Potential Applications of Eaton Bussmann EVKR Fuses
The EVKR 14 mm fuse series is designed around the electrical protection requirements of high-voltage DC systems. Its characteristics may be relevant to the following application areas, subject to confirmation of the manufacturer's approved application scope.
Electric Vehicle Battery Packs
High-voltage battery packs require suitable overcurrent protection to help manage electrical faults. The EVKR series' 1000 VDC rating and 25 kA maximum breaking capacity are relevant parameters when evaluating fuse options for compatible EV battery architectures.
High-Capacity Battery Systems
Battery systems designed for high power output require careful consideration of prospective short-circuit currents and protective-device coordination. The EVKR series offers current ratings from 35 A to 50 A for applications that fall within its specified operating limits.
Automotive Electrical Assemblies
The M8 screw connection and defined torque specification support integration into compatible electrical assemblies. Mechanical fit, terminal design and thermal performance must be verified as part of the installation process.
Application note: The presence of a suitable voltage and current rating does not establish suitability for every EV battery, charging circuit or energy-storage installation. Verify the intended use with the manufacturer's technical documentation before specifying the product.
How to Choose the Right EVKR 14 mm Fuse
Choosing the correct Eaton Bussmann EVKR fuse requires more than selecting a current rating. The following factors should be evaluated before procurement or installation.
1. Determine the required current rating. Assess continuous operating current, load variations, ambient temperature and relevant derating requirements. The available EVKR options are 35 A, 40 A and 50 A.
2. Verify the system voltage. Confirm that the operating DC voltage does not exceed the fuse's 1000 VDC rating and that the component is suitable for the circuit configuration.
3. Check prospective fault current. The maximum available fault current at the installation point must be compatible with the fuse's 25 kA maximum breaking capacity under the applicable conditions.
4. Confirm connection compatibility. Check that the 14 mm fuse format and M8 screw connections are compatible with the equipment and mounting arrangement.
5. Follow the specified torque. Use the recommended tightening torque of 12 ± 1 Nm for the listed variants, subject to the manufacturer's installation instructions.
6. Review environmental and standards requirements. Confirm that the storage conditions, environmental compliance and referenced standards meet the requirements of the intended application.
7. Consult the full datasheet. Verify time-current characteristics, operating conditions, qualification requirements and any other parameters needed for safe and coordinated circuit protection.
Frequently Asked Questions About Eaton Bussmann EVKR 14 mm Fuses
What voltage are Eaton Bussmann EVKR 14 mm fuses rated for?
The EVKR 14 mm fuse series has a rated voltage of 1000 VDC, making it relevant to compatible high-voltage direct current applications.
What current ratings are available?
The supplied catalogue lists three variants: EVKR14-35-T at 35 A, EVKR14-40-T at 40 A and EVKR14-50-T at 50 A.
What is the breaking capacity of the EVKR fuse series?
The maximum breaking capacity is 25 kA. The minimum breaking capacity is specified as 200% of rated current in the supplied technical information.
What type of screw connection does the EVKR series use?
All three listed variants use an M8 screw connection.
What is the recommended tightening torque?
The specified torque is 12 ± 1 Nm. Always follow the manufacturer's installation instructions for the applicable assembly.
How are EVKR 14 mm fuses packaged?
Each listed part number is supplied in packaging quantities of 100 units per box.
What is the storage temperature range?
The specified storage temperature range is −40°C to +85°C.
Which standards are referenced for the EVKR series?
The supplied information references ISO 8820-8 and GB/T 31465.6 and states compliance with RoHS, ELV and REACH requirements. Check current manufacturer documentation for the applicable declarations and product-specific qualifications.
Conclusion
The Eaton Bussmann EVKR 14 mm fuse series provides a selection of 35 A, 40 A and 50 A variants with a 1000 VDC rated voltage, a maximum breaking capacity of 25 kA and M8 screw connections.
Its combination of high-voltage capability, defined mounting requirements and environmental compliance makes it a product range worth evaluating for compatible electric vehicle and high-capacity battery applications.
For engineers, manufacturers and procurement professionals, choosing the correct EVKR fuse means verifying the rated current, system voltage, available fault current, installation requirements and applicable standards. Reviewing the manufacturer's full technical documentation is essential before final selection.
If you are sourcing Eaton Bussmann EVKR14-35-T, EVKR14-40-T or EVKR14-50-T fuses, use the part-number specifications above to identify the appropriate variant for your application.
