Littelfuse 0672.250DRT4P Equivalent & Substitute Parts

Part Overview

The Littelfuse 0672.250DRT4P is a 250 mA, 250 V AC/DC fast-blow glass cartridge fuse with axial through-hole mounting. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system maintenance and new design implementations. The glass cartridge construction provides visual indication of fuse status and is widely used in industrial and consumer electronics applications requiring overcurrent protection.

Substiute Parts

0672.250DRT4P

Littelfuse Inc.In Stock: 10360672.250DRT4P Datasheet

Current PartRFQ

0874.250MRET1P

Littelfuse Inc.In Stock: 11710874.250MRET1P Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 0672.250DRT4P is determined by the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Current Rating: 250 mA (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Response Time: Fast Blow (exact match required)
• Breaking Capacity @ Rated Voltage: 50 A (exact match required)

Mechanical Compatibility Criteria:

• Mounting Type: Through Hole (exact match required)
• Package / Case: Cartridge, Non-Standard (Axial) (exact match required)

Compliance Criteria:

• RoHS Status: ROHS3 Compliant (maintained)
• Approval Agency: CSA, UL or equivalent (cULus acceptable)

The substitute part 0874.250MRET1P meets all electrical and mechanical requirements while maintaining regulatory compliance. The primary difference is the cartridge material (ceramic versus glass) and dimensional variance within acceptable tolerance for axial cartridge fuses.

Parameter Comparison

Engineering Selection Recommendations

The 0874.250MRET1P is the direct substitute for the obsolete 0672.250DRT4P based on electrical and mechanical parameter equivalence. Both components maintain identical current, voltage, and response characteristics required for overcurrent protection in 250 V AC/DC circuits.

The substitute part offers the following advantages:

• Active product status ensures long-term availability and supply chain continuity
• Ceramic cartridge construction provides enhanced thermal stability compared to glass
• cULus certification maintains regulatory compliance across North American markets
• Lower DC cold resistance (0.692 Ohms versus 1.612 Ohms) reduces resistive heating in circuit operation
• Specified operating temperature range (-55°C ~ 125°C) provides defined thermal performance boundaries

Dimensional differences (0.142" Dia x 0.394" L versus 0.154" Dia x 0.433" L) are within acceptable tolerance for axial cartridge fuse mounting in standard through-hole applications. Physical fit verification in the specific circuit board or fuse holder is required prior to deployment.

Frequently Asked Questions (FAQ)

Q: Can the 0874.250MRET1P be used as a direct replacement for the 0672.250DRT4P?

A: Yes. Both components share identical electrical specifications: 250 mA current rating, 250 V AC voltage rating, fast-blow response time, and 50 A breaking capacity. Mechanical compatibility is maintained through identical axial cartridge mounting and through-hole configuration. Physical dimensions vary slightly but remain within acceptable tolerance for standard fuse holder applications.

Q: What is the primary difference between these two fuses?

A: The main difference is cartridge material. The 0672.250DRT4P uses glass construction, while the 0874.250MRET1P uses ceramic construction. Ceramic cartridges provide improved thermal stability and are the current industry standard. The 0874.250MRET1P also features lower DC cold resistance and a specified operating temperature range.

Q: Will the 0874.250MRET1P fit in existing fuse holders designed for the 0672.250DRT4P?

A: Physical fit depends on the specific fuse holder design. The substitute part has slightly smaller dimensions (0.142" Dia x 0.394" L versus 0.154" Dia x 0.433" L). Verification with the fuse holder manufacturer or physical testing is required to confirm mechanical compatibility in the specific application.

Q: Are both parts RoHS compliant?

A: Yes. Both the 0672.250DRT4P and 0874.250MRET1P are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: Why is the 0672.250DRT4P listed as obsolete?

A: The 0672.250DRT4P is obsolete due to industry transition toward ceramic cartridge fuses, which offer superior thermal performance and reliability. The 0874.250MRET1P represents the current-generation equivalent with active product status and ongoing manufacturer support.

Q: What certifications do these fuses carry?

A: The 0672.250DRT4P carries CSA and UL certifications. The 0874.250MRET1P carries cULus certification, which covers both Canadian and United States regulatory requirements and is equivalent in scope.