Littelfuse 0675003.DRT4P Ceramic Cartridge Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0675003.DRT4P is a 3A 250VAC ceramic cartridge fuse with axial through-hole mounting. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new designs. The fuse is designed for general-purpose circuit protection applications requiring slow-blow response characteristics and ceramic construction for enhanced reliability.

Substiute Parts

0675003.DRT4P

Littelfuse Inc.In Stock: 9330675003.DRT4P Datasheet

Current PartRFQ

0875003.MRET1P

Littelfuse Inc.In Stock: 11550875003.MRET1P Datasheet

DirectRFQ

0675003.DRT4

Littelfuse Inc.In Stock: 11980675003.DRT4 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 0675003.DRT4P is determined by strict equivalence across the following critical parameters:

• Current Rating: 3 A (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Fuse Type: Cartridge, Ceramic (exact match required)
• Response Time: Slow Blow (exact match required)
• Mounting Type: Through Hole (exact match required)
• Breaking Capacity @ Rated Voltage: 50 A (exact match required)

Two substitute parts meet these criteria: the Littelfuse 0875003.MRET1P (direct manufacturer substitute with active product status) and the Littelfuse 0675003.DRT4 (parametric equivalent within the same series).

Parameter Comparison

Engineering Selection Recommendations

The Littelfuse 0875003.MRET1P is the primary substitute for the obsolete 0675003.DRT4P. This part carries active product status, ROHS3 compliance, and cULus certification. The 0875003.MRET1P features a defined operating temperature range (-55°C ~ 125°C) and improved DC cold resistance (0.0171 Ohms versus 0.0245 Ohms), providing enhanced performance characteristics. Physical dimensions differ slightly (0.142" Dia x 0.394" L versus 0.154" Dia x 0.433" L), which must be evaluated for mechanical fit within the target application.

The Littelfuse 0675003.DRT4 serves as a parametric equivalent within the same 675 series, maintaining identical electrical specifications and physical dimensions. However, this part is RoHS non-compliant and lacks a specified operating temperature range, making it suitable only for applications where RoHS compliance is not required.

Frequently Asked Questions (FAQ)

Q: Can the 0875003.MRET1P be used as a direct replacement for the 0675003.DRT4P?

A: The 0875003.MRET1P meets all critical electrical parameters (3A, 250VAC, 50A breaking capacity, slow-blow response). Physical dimensions differ slightly; verify mechanical fit within the fuse holder or socket before implementation.

Q: What is the difference between the 0875003.MRET1P and 0675003.DRT4 substitutes?

A: Both parts meet electrical specifications. The 0875003.MRET1P is active, ROHS3 compliant, and cULus certified with a defined operating temperature range. The 0675003.DRT4 is RoHS non-compliant and lacks temperature specifications. Select based on compliance requirements and environmental operating conditions.

Q: Why does the 0875003.MRET1P have different physical dimensions?

A: The 0875003.MRET1P (3.60mm x 10.00mm) is slightly smaller than the 0675003.DRT4P (3.90mm x 11.00mm). Both are non-standard axial cartridge formats. Confirm compatibility with the mechanical mounting structure of your application.

Q: Are there differences in thermal or electrical performance between these parts?

A: The 0875003.MRET1P exhibits lower DC cold resistance (0.0171 Ohms) and higher melting I²t (24.5) compared to the 0675003.DRT4P (0.0245 Ohms, 18.3 I²t). These differences reflect improved thermal characteristics and are functionally compatible for the specified 3A, 250VAC application.

Q: Which substitute should be selected for new designs?

A: The 0875003.MRET1P is recommended for new designs due to active product status, ROHS3 compliance, cULus certification, and defined operating temperature range (-55°C ~ 125°C).