Littelfuse 0977004.MXEP Ceramic Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0977004.MXEP is a 4 A ceramic cartridge fuse rated for 500 V AC and 450 V DC operation in a 5mm x 20mm through-hole package. This slow-blow fuse is designed for circuit protection in industrial and commercial applications requiring reliable overcurrent protection with extended response characteristics. The part maintains active product status with full RoHS3 compliance and international safety certifications (CE, PSE, SEMKO). Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to supply constraints or application-specific voltage rating requirements.

Substiute Parts

0977004.MXEP

Littelfuse Inc.In Stock: 17170977004.MXEP Datasheet

Current PartRFQ

0ADKP4000-RE

Bel Fuse Inc.In Stock: 17580ADKP4000-RE Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Littelfuse 0977004.MXEP is determined by the following critical parameters:

Primary Substitution Criteria:

• Current Rating: Must be 4 A (exact match required)
• Fuse Type: Must be Cartridge, Ceramic
• Response Time: Must be Slow Blow
• Package / Case: Must be 5mm x 20mm (Axial)
• Mounting Type: Must be Through Hole
• Operating Temperature Range: Must support -55°C ~ 125°C minimum

Secondary Compatibility Factors:

• Voltage Rating - AC: Substitute must meet or exceed 500 V AC
• Voltage Rating - DC: Substitute must meet or exceed 450 V DC
• RoHS Compliance: Must maintain RoHS3 Compliant status

The Bel Fuse Inc. 0ADKP4000-RE meets all primary substitution criteria and exceeds secondary voltage requirements, making it a direct functional equivalent for applications where higher voltage ratings provide additional design margin.

Parameter Comparison

Engineering Selection Recommendations

The Bel Fuse 0ADKP4000-RE is a qualified substitute for the Littelfuse 0977004.MXEP based on electrical and mechanical parameter equivalence. Both components share identical current ratings, response characteristics, and physical form factors. The substitute part provides enhanced voltage ratings (600 V AC / 500 V DC versus 500 V AC / 450 V DC), which is compatible with applications designed for the original part.

Both parts maintain active product status and RoHS3 compliance. The Littelfuse part carries CE, PSE, and SEMKO certifications, while the Bel Fuse part carries cURus certification. Selection between these parts should be based on application-specific certification requirements and supply availability.

Frequently Asked Questions (FAQ)

Q: Can the Bel Fuse 0ADKP4000-RE replace the Littelfuse 0977004.MXEP in all applications?

A: Yes, provided the application does not require specific certifications exclusive to the Littelfuse part. The Bel Fuse substitute meets or exceeds all electrical parameters and maintains identical mechanical compatibility. Verify that cURus certification satisfies your application requirements.

Q: What is the significance of the higher voltage ratings on the substitute part?

A: The Bel Fuse 0ADKP4000-RE is rated for 600 V AC and 500 V DC compared to 500 V AC and 450 V DC on the original part. This provides additional voltage margin and allows the substitute to function in applications with higher system voltages while maintaining the same current protection level.

Q: Are the physical dimensions identical between these parts?

A: Both parts use the 5mm x 20mm (Axial) package with through-hole mounting. The Littelfuse part specifies 0.228" Dia x 0.886" L (5.80mm x 22.50mm), while the Bel Fuse part specifies 0.236" Dia x 0.886" L (6.00mm x 22.50mm). The minor diameter difference (0.2mm) remains within standard mechanical tolerance for 5mm x 20mm cartridge fuses and does not affect mounting compatibility.

Q: Do both parts support the same operating temperature range?

A: Yes, both the Littelfuse 0977004.MXEP and Bel Fuse 0ADKP4000-RE operate across -55°C to 125°C, ensuring thermal compatibility across industrial and commercial temperature environments.

Q: What certifications should I consider when selecting between these parts?

A: The Littelfuse part carries CE, PSE, and SEMKO certifications. The Bel Fuse substitute carries cURus certification. Select based on your application's geographic market requirements and regulatory compliance obligations.