Littelfuse 0977008.MXEP Ceramic Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0977008.MXEP is an 8A ceramic cartridge fuse rated for 500V AC and 450V 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 interruption. The part maintains active product status with 1097 units in current inventory. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to supply constraints, design flexibility, or application-specific voltage or breaking capacity requirements.

Substiute Parts

0977008.MXEP

Littelfuse Inc.In Stock: 11850977008.MXEP Datasheet

Current PartRFQ

0ADKP8000-RE

Bel Fuse Inc.In Stock: 14730ADKP8000-RE Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The Bel Fuse Inc. 0ADKP8000-RE is qualified as a direct substitute for the Littelfuse 0977008.MXEP based on the following substitution criteria:

Matching Parameters:

• Current Rating: 8 A (identical)
• Fuse Type: Cartridge, Ceramic (identical)
• Package / Case: 5mm x 20mm (Axial) (identical)
• Response Time: Slow Blow (identical)
• Mounting Type: Through Hole (identical)
• Operating Temperature Range: -55°C ~ 125°C (identical)
• RoHS Status: ROHS3 Compliant (identical)

Enhanced Parameters:

• Voltage Rating - AC: 600 V (exceeds 500 V requirement)
• Voltage Rating - DC: 500 V (exceeds 450 V requirement)
• Breaking Capacity: 200A AC, 300A DC (exceeds 100A AC, 200A DC requirement)

The 0ADKP8000-RE maintains full mechanical and electrical compatibility while providing higher voltage and breaking capacity ratings, making it suitable for applications requiring the same 8A current protection with enhanced voltage margin.

Parameter Comparison

Engineering Selection Recommendations

Both the Littelfuse 0977008.MXEP and Bel Fuse 0ADKP8000-RE are active products with current inventory availability and ROHS3 compliance. The Littelfuse part carries CE, PSE, and SEMKO certifications, while the Bel Fuse substitute carries cURus certification. Selection between these parts should be based on:

1. Certification Requirements: Verify that the required approval agencies (CE, PSE, SEMKO, or cURus) align with your application's regulatory requirements.

2. Voltage Margin: The 0ADKP8000-RE provides higher AC and DC voltage ratings, offering additional safety margin in applications operating near the 500V AC / 450V DC limits of the original part.

3. Breaking Capacity: The 0ADKP8000-RE's enhanced breaking capacity (200A AC, 300A DC versus 100A AC, 200A DC) accommodates higher fault current environments.

4. Melting I²t Characteristic: The 0977008.MXEP has a higher melting I²t value (233 versus 179), resulting in slightly slower thermal response. This distinction is relevant only if precise thermal coordination with upstream protection devices is critical.

5. Supply Availability: Both parts are in stock; selection may depend on procurement lead times or supplier preference.

Frequently Asked Questions (FAQ)

Q: Can the Bel Fuse 0ADKP8000-RE be used as a direct replacement for the Littelfuse 0977008.MXEP?

A: Yes. Both parts share identical current rating (8A), fuse type (ceramic cartridge), package dimensions (5mm x 20mm), response time (slow blow), and operating temperature range (-55°C to 125°C). The Bel Fuse part exceeds the voltage and breaking capacity specifications of the original, ensuring full compatibility in applications designed for the Littelfuse part.

Q: What is the difference in melting I²t between these two fuses?

A: The Littelfuse 0977008.MXEP has a melting I²t of 233, while the Bel Fuse 0ADKP8000-RE has a melting I²t of 179. This indicates the Littelfuse part has a slightly higher thermal mass and responds more slowly to overcurrent conditions. In most general-purpose applications, this difference is not significant; however, in systems requiring precise coordination with other protective devices, this characteristic should be verified against circuit design specifications.

Q: Are there any physical dimension differences between these fuses?

A: The nominal package is identical (5mm x 20mm axial), but the Bel Fuse part has a slightly larger diameter (6.00mm versus 5.80mm). This minor difference is within typical manufacturing tolerances for ceramic cartridge fuses and does not affect mechanical fit in standard 5mm x 20mm fuse holders.

Q: Which certifications apply to each part?

A: The Littelfuse 0977008.MXEP carries CE, PSE, and SEMKO approvals. The Bel Fuse 0ADKP8000-RE carries cURus certification. Verify that the required certifications for your application and target markets are present before selection.

Q: Can I use the 0ADKP8000-RE in a circuit rated for 500V AC / 450V DC?

A: Yes. The 0ADKP8000-RE is rated for 600V AC and 500V DC, exceeding the circuit requirements. This provides additional voltage margin and is a valid substitution for the original part.

Q: What is the difference in breaking capacity, and does it matter for my application?

A: The Littelfuse part has a breaking capacity of 100A AC and 200A DC. The Bel Fuse substitute has 200A AC and 300A DC. Breaking capacity defines the maximum fault current the fuse can safely interrupt. If your circuit's maximum available fault current exceeds the original part's breaking capacity, the substitute with higher breaking capacity is required. Consult your circuit design documentation to determine the required breaking capacity.