Littelfuse 0672007.DRT4 Equivalent & Substitute Parts

Part Overview

The Littelfuse 0672007.DRT4 is a 7A 250VAC fast-blow glass cartridge fuse with axial through-hole mounting. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations. The glass cartridge construction provides visual indication of fuse status and is commonly used in industrial and consumer electronics applications requiring reliable overcurrent protection.

Substiute Parts

0672007.DRT4

Littelfuse Inc.In Stock: 9750672007.DRT4 Datasheet

Current PartRFQ

0874007.MRET1P

Littelfuse Inc.In Stock: 10810874007.MRET1P Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 0672007.DRT4 must maintain electrical equivalence across the following critical parameters:

• Current Rating: 7 A (exact match required)
• Voltage Rating: 250 V AC (exact match required)
• Response Time: Fast Blow (exact match required)
• Breaking Capacity: 50 A @ rated voltage (exact match required)
• Mounting Type: Through Hole axial configuration (exact match required)

The primary distinction between the main part and its substitute lies in the fuse element material: the original uses glass construction, while the substitute employs ceramic construction. Both materials are acceptable for this application category when all electrical parameters remain identical. Dimensional variations within the axial cartridge form factor are permissible provided mechanical fit in the host application is verified.

Parameter Comparison

Engineering Selection Recommendations

The 0874007.MRET1P ceramic cartridge fuse is the direct electrical equivalent for the obsolete 0672007.DRT4 glass cartridge fuse. Both components satisfy identical electrical requirements: 7A current rating, 250V AC voltage rating, fast-blow response, and 50A breaking capacity.

The substitute part offers the following advantages:

• Active product status ensures long-term availability and supply chain continuity
• ROHS3 compliance meets current environmental and regulatory standards
• cULus certification provides North American safety approval equivalent to the original CSA/UL ratings
• Lower DC cold resistance (0.0099 Ohms vs. 0.0111 Ohms) provides marginally improved electrical performance

Dimensional differences are minor (0.142" vs. 0.154" diameter; 0.394" vs. 0.433" length). Mechanical fit must be confirmed in the specific host application, particularly in fuse holders or clips designed for the original cartridge dimensions.

Frequently Asked Questions (FAQ)

Q: Can the 0874007.MRET1P ceramic fuse replace the 0672007.DRT4 glass fuse in all applications?

A: Electrical replacement is direct and complete. The ceramic construction maintains identical current rating, voltage rating, response time, and breaking capacity. Mechanical fit in the host application must be confirmed due to minor dimensional differences.

Q: What is the difference between glass and ceramic cartridge fuses?

A: Both are acceptable fuse element materials for this current and voltage class. Glass construction provides visual status indication through transparency. Ceramic construction offers equivalent electrical performance with different thermal and mechanical characteristics. Selection depends on application requirements for status visibility and mechanical robustness.

Q: Are the certifications equivalent between the original and substitute?

A: The original part carries CSA and UL approvals. The substitute carries cULus certification, which represents combined CSA and UL approval. This is equivalent for North American applications.

Q: Does the lower DC cold resistance of the substitute affect circuit operation?

A: The difference in DC cold resistance (0.0099 Ohms vs. 0.0111 Ohms) is negligible for typical circuit applications. This represents a 10.8% reduction and does not alter the fuse's protective characteristics or response time.

Q: Is the substitute part RoHS compliant?

A: Yes. The 0874007.MRET1P is ROHS3 compliant, whereas the original 0672007.DRT4 is RoHS non-compliant. This is advantageous for new designs and systems subject to environmental regulations.

Q: What should I verify before implementing the substitute?

A: Confirm mechanical fit of the 0.142" diameter x 0.394" length cartridge in the existing fuse holder or clip designed for the original 0.154" diameter x 0.433" length dimensions. Electrical parameters are fully equivalent and require no additional verification.