Littelfuse 0673003.MXE Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0673003.MXE is a 3A 250VAC glass cartridge fuse with axial through-hole mounting. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The part features slow-blow response characteristics and is approved by CSA and UL agencies. Due to its discontinued status, identifying compatible alternatives ensures design continuity and supply chain reliability.

Key Parameters

Parameter	Value
Manufacturer Part Number	0673003.MXE
Manufacturer	Littelfuse Inc.
Current Rating	3 A
Voltage Rating - AC	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Mounting Type	Through Hole
Package / Case	Cartridge, Non-Standard (Axial)
Breaking Capacity @ Rated Voltage	50 A
Product Status	Obsolete
Approval Agency	CSA, UL
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

The Littelfuse 0875003.MXEP qualifies as a substitute for the 0673003.MXE based on the following critical electrical and mechanical parameters:

Matching Parameters:

Current Rating: 3 A (identical)
Voltage Rating - AC: 250 V (identical)
Response Time: Slow Blow (identical)
Breaking Capacity @ Rated Voltage: 50 A (identical)
Mounting Type: Through Hole (identical)
Package / Case: Cartridge, Non-Standard (Axial) (identical)
Approval Agency: cULus certification (equivalent to CSA/UL)
RoHS Status: ROHS3 Compliant (identical)

Differing Parameters:

Fuse Type: Ceramic (vs. Glass in original)
Physical Dimensions: 0.142" Dia x 0.394" L (vs. 0.154" Dia x 0.433" L)
Melting I²t: 24.5 (vs. 18.4)
DC Cold Resistance: 0.0171 Ohms (vs. 0.0247 Ohms)
Product Status: Active (vs. Obsolete)
Operating Temperature: -55°C ~ 125°C (specified vs. unspecified)

The substitute maintains electrical equivalence through identical current, voltage, and breaking capacity ratings. The ceramic construction and dimensional variance represent design evolution within the same functional category.

Parameter Comparison

Parameter	0673003.MXE (Original)	0875003.MXEP (Substitute)
Manufacturer	Littelfuse Inc.	Littelfuse Inc.
Current Rating (Amps)	3 A	3 A
Voltage Rating - AC	250 V	250 V
Response Time	Slow Blow	Slow Blow
Fuse Type	Cartridge, Glass	Cartridge, Ceramic
Mounting Type	Through Hole	Through Hole
Package / Case	Cartridge, Non-Standard (Axial)	Cartridge, Non-Standard (Axial)
Breaking Capacity @ Rated Voltage	50 A	50 A
Size / Dimension	0.154" Dia x 0.433" L (3.90mm x 11.00mm)	0.142" Dia x 0.394" L (3.60mm x 10.00mm)
DC Cold Resistance	0.0247 Ohms	0.0171 Ohms
Melting I²t	18.4	24.5
Product Status	Obsolete	Active
Approval Agency	CSA, UL	cULus
RoHS Status	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

The 0875003.MXEP is the manufacturer-recommended substitute for the obsolete 0673003.MXE. Selection is supported by:

Product Status: The substitute is active and in production, ensuring long-term availability and supply chain stability compared to the obsolete original part.

Regulatory Compliance: Both parts maintain ROHS3 compliance. The substitute carries cULus certification, which provides equivalent safety approval coverage to the original CSA/UL certifications.

Electrical Equivalence: Identical current rating (3A), voltage rating (250V AC), response time (Slow Blow), and breaking capacity (50A) ensure functional compatibility in the intended circuit application.

Physical Compatibility: While dimensional differences exist, both parts maintain the same axial through-hole cartridge form factor and non-standard package classification, supporting direct mechanical substitution in existing designs.

Frequently Asked Questions (FAQ)

Q: Can the 0875003.MXEP be used as a direct replacement for the 0673003.MXE?

A: Yes. Both parts share identical electrical ratings (3A, 250VAC, 50A breaking capacity) and mounting type (through-hole axial cartridge). The substitute is the manufacturer-recommended alternative for the obsolete original.

Q: What is the difference between glass and ceramic fuse construction?

A: The original uses glass cartridge construction; the substitute uses ceramic. Both are cartridge fuse types with identical electrical performance in this application. Ceramic construction is the current industry standard for this fuse category.

Q: Are there physical dimension concerns with substitution?

A: The substitute is slightly smaller (0.142" Dia x 0.394" L vs. 0.154" Dia x 0.433" L). Both maintain the non-standard axial cartridge form factor. Verify mechanical fit in the fuse holder or socket before implementation.

Q: Do the different melting I²t values affect substitution?

A: The substitute has a higher melting I²t (24.5 vs. 18.4), indicating slightly different thermal response characteristics. Both maintain the slow-blow response classification and identical current/voltage ratings, ensuring functional equivalence for the specified application.

Q: What certifications apply to the substitute part?

A: The 0875003.MXEP carries cULus certification, which provides equivalent safety approval to the original CSA/UL certifications for this fuse category.

Q: Is the substitute part readily available?

A: Yes. The 0875003.MXEP is active in production status with documented inventory availability, unlike the obsolete original part.

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