Equivalent & Substitute Parts for 0673.100DRT4P

Part Overview

The 0673.100DRT4P is a 100 mA, 250 V AC/DC fuse cartridge manufactured by Littelfuse Inc. in the 673 series. This component is a glass-bodied, through-hole axial fuse with slow-blow response characteristics, designed for circuit protection applications requiring moderate current ratings and standard voltage levels.

The 0673.100DRT4P is classified as obsolete. Identifying suitable substitute components is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this fuse type.

Substiute Parts

0673.100DRT4P

Littelfuse Inc.In Stock: 11770673.100DRT4P Datasheet

Current PartRFQ

0875.100MRET1P

Littelfuse Inc.In Stock: 11970875.100MRET1P Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 0673.100DRT4P is determined by the following critical parameters:

• Current Rating: 100 mA (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Response Time: Slow Blow (exact match required)
• Breaking Capacity @ Rated Voltage: 50 A (exact match required)
• Mounting Type: Through Hole (exact match required)
• Approval Agency: CSA, UL or equivalent certifications (cULus acceptable)
• RoHS Compliance: ROHS3 Compliant (maintained)

The substitute part 0875.100MRET1P meets all critical electrical parameters. The primary difference is the fuse body material (ceramic instead of glass) and dimensional variation within acceptable tolerances for through-hole axial mounting. The ceramic construction provides enhanced thermal performance and improved melting I²t characteristics while maintaining identical current, voltage, and breaking capacity ratings.

Parameter Comparison

Engineering Selection Recommendations

The 0875.100MRET1P is the manufacturer-recommended substitute for the obsolete 0673.100DRT4P. Both components are manufactured by Littelfuse Inc. and maintain identical electrical performance specifications across current rating, voltage rating, and breaking capacity.

The substitute part carries active product status, ensuring continued availability and supply chain support. Regulatory compliance is maintained through cULus certification, which encompasses both CSA and UL standards. Both parts are ROHS3 compliant and REACH unaffected.

The ceramic fuse body of the 0875.100MRET1P provides superior thermal stability compared to the glass construction of the main part. The dimensional reduction (0.142" Dia x 0.394" L versus 0.154" Dia x 0.433" L) is within acceptable tolerances for through-hole axial mounting applications and may provide space optimization benefits in compact circuit designs.

Frequently Asked Questions (FAQ)

Q: Can the 0875.100MRET1P be used as a direct replacement for the 0673.100DRT4P?

A: Yes. Both components share identical current rating (100 mA), voltage rating (250 V AC), response time (slow blow), and breaking capacity (50 A). The ceramic body construction of the substitute provides equivalent or superior performance characteristics.

Q: What is the primary difference between these two fuse types?

A: The main difference is the fuse body material. The 0673.100DRT4P uses glass construction, while the 0875.100MRET1P uses ceramic construction. Ceramic fuses offer improved thermal performance and higher melting I²t values, providing enhanced protection in transient surge conditions.

Q: Are there dimensional compatibility concerns?

A: The 0875.100MRET1P is slightly smaller (0.142" Dia x 0.394" L) compared to the 0673.100DRT4P (0.154" Dia x 0.433" L). Both are through-hole axial cartridges and fit standard fuse holders designed for non-standard axial cartridges. Verify fuse holder specifications if space constraints are critical.

Q: Do both parts meet the same regulatory standards?

A: The 0673.100DRT4P carries CSA and UL approvals. The 0875.100MRET1P carries cULus certification, which encompasses both CSA and UL standards. Both are ROHS3 compliant and REACH unaffected.

Q: What is the packaging difference?

A: The 0673.100DRT4P is supplied in standard packaging. The 0875.100MRET1P is supplied in Tape & Reel (TR) format, which is standard for active production components and provides advantages for automated assembly processes.

Q: Is the lower DC cold resistance of the substitute part a concern?

A: No. The lower DC cold resistance (2.9 Ohms versus 7.53 Ohms) of the 0875.100MRET1P is a characteristic of ceramic fuse construction and does not affect circuit protection performance. Both parts maintain the same current rating and response characteristics.