Equivalent & Substitute Parts for 0672001.DRT4P

Part Overview

The 0672001.DRT4P is a 1 A 250 V AC/DC fast-blow glass cartridge fuse with axial through-hole mounting, manufactured by Littelfuse Inc. as part of the 672 series. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing system maintenance and new design implementations. The glass cartridge construction and non-standard axial form factor define the primary constraints for substitution.

Substiute Parts

0672001.DRT4P

Littelfuse Inc.In Stock: 12120672001.DRT4P Datasheet

Current PartRFQ

0874001.MRET1P

Littelfuse Inc.In Stock: 7860874001.MRET1P Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 0672001.DRT4P is determined by strict equivalence in electrical performance parameters: current rating (1 A), voltage rating (250 V AC), response time (fast blow), and breaking capacity (50 A). The mounting type (through-hole axial cartridge) and approval certifications (CSA, UL or equivalent) are mandatory compatibility criteria. The 0874001.MRET1P qualifies as a substitute based on matching all electrical parameters and maintaining through-hole axial mounting, despite the material change from glass to ceramic construction. This material difference is permissible because both cartridge types meet the same electrical and safety standards for this current and voltage class.

Parameter Comparison

Engineering Selection Recommendations

The 0874001.MRET1P is the active substitute for the obsolete 0672001.DRT4P. Both components maintain identical electrical specifications (1 A, 250 V AC, fast-blow response, 50 A breaking capacity) and through-hole axial mounting configuration. The substitute carries cULus certification, which supersedes the original CSA/UL approvals and provides broader regulatory acceptance. The ceramic cartridge construction of the substitute offers improved thermal stability with a defined operating temperature range (-55°C ~ 125°C) compared to the glass cartridge original. Both parts are ROHS3 compliant. Physical dimensions differ slightly; the substitute is marginally smaller in diameter and length, which may require mechanical fit verification in legacy circuit designs. The lower DC cold resistance (0.086 Ohms vs. 0.1056 Ohms) and reduced melting I²t (0.406 vs. 0.508) of the substitute indicate faster thermal response characteristics, maintaining fast-blow performance within the specified current class.

Frequently Asked Questions (FAQ)

Q: Can the 0874001.MRET1P be used as a direct replacement for the 0672001.DRT4P?

A: Yes. Both components share identical electrical ratings (1 A, 250 V AC), response time (fast blow), breaking capacity (50 A), and through-hole axial mounting. The substitute is currently in active production, whereas the original is obsolete.

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

A: Glass and ceramic are both acceptable cartridge materials for this current and voltage class. Both meet the same electrical and safety standards. The ceramic construction of the substitute provides a defined operating temperature range and improved thermal stability.

Q: Will the physical size difference affect installation?

A: The substitute (3.60mm x 10.00mm) is slightly smaller than the original (3.90mm x 11.00mm). Mechanical fit must be verified in the specific circuit design, particularly in confined spaces or with tight mechanical tolerances.

Q: Are the certifications equivalent?

A: The substitute carries cULus certification, which provides broader regulatory coverage than the original CSA/UL certifications. Both meet the required safety standards for this component class.

Q: What do the melting I²t and DC cold resistance differences mean?

A: The substitute exhibits lower melting I²t (0.406 vs. 0.508) and lower DC cold resistance (0.086 vs. 0.1056 Ohms), indicating faster thermal response. This maintains fast-blow performance and does not affect compatibility within the 1 A current class.