ADLER EF3 EV Fuse 150–300 A for 200-V DC Systems

The ADLER EF3 is a compact, screw-in high-current DC fuse. It was developed to protect high-performance battery, charging, and battery management systems in electric and hybrid vehicles.

The ADLER EF3 series is available with various rated currents and voltage ratings. On this product page, you can choose from 150, 200, 250, and 300 A at 200 V DC. For higher rated currents, separate versions with 350, 400, and 450 A at 250 V DC are available.

Advantages of the ADLER EF3 EV fuse

• High DC fault current protection: Breaking capacity of up to 50 kA at 200 V DC.
• Suitable current ratings: Available on this product page in 150, 200, 250, or 300 A.
• Expanded EF3 product line: Separate 250-V DC versions cover rated currents from 350 to 450 A.
• Compact dimensions: All four 200-V variants feature the same design.
• For cyclic loads: Designed to meet the requirements of electric vehicle and battery systems.
• Screw-type connection: The fuse is mounted using M8 screw connections.
• Traceability: According to the manufacturer, each fuse is marked with a QR code.

Available fuse ratings

The following rated currents for 200 V DC are available on this product page:

• 150 A
• 200 A
• 250 A
• 300 A

For applications requiring higher rated currents, the ADLER-EF3 series also offers fuses rated at 350, 400, and 450 A at 250 V DC. Due to differences in rated voltage and design, these variants are listed on a separate product page.

Dimensions

The variants offered here with 150, 200, 250, and 300 A have the same main dimensions:

Open the ADLER EF3 manufacturer’s data sheet

Suitable Applications

The ADLER EF3 was developed to protect high-performance battery, charging, and management systems in electric and hybrid vehicles. It is suitable for DC power paths where high operating currents and high potential short-circuit currents may occur.

Use in other mobile or stationary battery systems requires that the rated voltage, operating current, potential short-circuit current, time-current characteristic, and thermal conditions be properly verified. For systems with currents exceeding 300 A, separate EF3 versions are available for 350, 400, and 450 A at 250 V DC.

Selection and Installation

The appropriate fuse rating is not selected based solely on the normal operating current. The wire cross-section, load peaks, possible short-circuit current, ambient temperature, and the time-current characteristic must also be taken into account.

The EF3 is mounted using M8 screw connections. The manufacturer recommends a tightening torque of 12 ± 1 Nm. Refer to the current data sheet for complete installation and operating conditions.

Conclusion

The ADLER EF3 offers a compact solution for protecting high-power DC systems. On this product page, you can choose between 150, 200, 250, and 300 A for 200 V DC applications. For higher rated currents, separate EF3 models with 350, 400, and 450 A at 250 V DC are available.

Frequently Asked Questions About the ADLER EF3 EV Fuse

• What fuse ratings are available within the ADLER EF3 series?

  
  

  This product page offers variants rated at 150, 200, 250, and 300 A at 200 V DC. In addition, separate EF3 versions rated at 350, 400, and 450 A at 250 V DC are available.

• What are the dimensions of the 200-V models?

  
  

  The variants offered here are 77 ± 1 mm long, 25 ± 1 mm high, and 20 ± 0.5 mm wide. The 250-V versions have a different, wider design.

• Is a fuse holder included?

  
  

  The EF3 is the fuse insert. Whether a holder or additional connection hardware is included depends on the specific offer and scope of delivery.

• How do you determine the correct fuse rating?

  
  

  The determining factors are operating current, wire gauge, DC voltage, peak loads, potential short-circuit current, and the time-current characteristic curve. The design should be performed by a qualified professional.