Littelfuse 0672002.DRT4 Equivalent & Substitute Parts

Part Overview

The Littelfuse 0672002.DRT4 is a 2A 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 fuse is designed for circuit protection in applications requiring fast response characteristics and operates within a 250V AC/DC rating with a 50A breaking capacity.

Substiute Parts

0672002.DRT4

Littelfuse Inc.In Stock: 11590672002.DRT4 Datasheet

Current PartRFQ

0874002.MRET1P

LittelfuseIn Stock: 8850874002.MRET1P Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 0672002.DRT4 is determined by strict equivalence across the following critical parameters:

• Current Rating: 2 A (exact match required)
• Voltage Rating: 250 V AC (exact match required)
• Response Time: Fast Blow (exact match required)
• Mounting Type: Through Hole (exact match required)
• Package / Case: Cartridge, Non-Standard (Axial) (exact match required)
• Breaking Capacity @ Rated Voltage: 50 A (exact match required)

The primary substitute, Littelfuse 0874002.MRET1P, meets all critical electrical parameters while offering an active product status and improved compliance profile. The material composition differs (ceramic vs. glass), but this change does not affect the electrical performance within the specified operating parameters.

Parameter Comparison

Engineering Selection Recommendations

The Littelfuse 0874002.MRET1P is the direct substitute for the obsolete 0672002.DRT4. Both components maintain identical electrical ratings (2A, 250V AC, 50A breaking capacity, fast-blow response). The substitute offers the following advantages:

• Active product status ensures continued availability and supply chain stability
• ROHS3 compliance meets current environmental regulations
• cULus certification provides expanded regulatory recognition
• Defined operating temperature range (-55°C ~ 125°C) supports broader application environments
• Ceramic construction provides enhanced thermal stability compared to glass

The dimensional variance (0.142" Dia x 0.394" L vs. 0.154" Dia x 0.433" L) is within acceptable tolerance for through-hole cartridge fuse applications. DC cold resistance remains functionally equivalent (0.04 Ohms vs. 0.0378 Ohms).

Frequently Asked Questions (FAQ)

Q: Can the 0874002.MRET1P directly replace the 0672002.DRT4 in existing designs?

A: Yes. Both components share identical current rating (2A), voltage rating (250V AC), response time (fast-blow), and breaking capacity (50A). The through-hole axial mounting is equivalent. Dimensional differences are minor and do not affect mechanical fit in standard cartridge fuse holders.

Q: What is the significance of the material change from glass to ceramic?

A: The material change does not affect electrical performance within the specified operating parameters. Ceramic construction provides improved thermal stability and is standard in current-generation fast-blow cartridge fuses.

Q: Why is the 0672002.DRT4 listed as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The 0874002.MRET1P represents the active equivalent in Littelfuse's current product portfolio.

Q: Are there compliance differences between the two parts?

A: Yes. The 0874002.MRET1P is ROHS3 compliant and carries cULus certification, while the 0672002.DRT4 is RoHS non-compliant with CSA/UL certification. For new designs and regulated applications, the substitute meets current environmental and safety standards.

Q: What is the impact of the DC cold resistance difference?

A: The DC cold resistance values (0.0378 Ohms vs. 0.04 Ohms) are functionally equivalent for circuit protection applications. This minor variance does not affect fuse operation or circuit performance.

Q: Is the operating temperature range important for my application?

A: The 0874002.MRET1P specifies an operating temperature range of -55°C ~ 125°C. If your application operates outside this range, verify compatibility with your specific environmental requirements.