Littelfuse 0673003.MXEP Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0673003.MXEP is a 3A 250VAC axial glass cartridge fuse designed for through-hole mounting applications. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing system maintenance and new design implementations. The part delivers slow-blow response characteristics with a 50A breaking capacity at rated voltage and maintains ROHS3 compliance with CSA and UL approvals.

Key Parameters

Parameter	Value
Manufacturer Part Number	0673003.MXEP
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
RoHS Status	ROHS3 Compliant
Approvals	CSA, UL

Substitute Part Grouping Explanation

Substitute identification for the 0673003.MXEP is based on the following critical electrical and mechanical parameters:

Current Rating: 3 A (exact match required)
Voltage Rating: 250 V AC (exact match required)
Response Time: Slow Blow (exact match required)
Breaking Capacity: 50 A (exact match required)
Mounting Type: Through Hole (exact match required)
Package Configuration: Cartridge, Non-Standard (Axial) (exact match required)

The Littelfuse 0875003.MXEP qualifies as a direct substitute based on matching all critical electrical parameters. The primary distinction lies in the cartridge material composition: the substitute employs ceramic construction rather than glass, which affects thermal characteristics and melting I²t values while maintaining functional equivalence for the specified electrical ratings.

Parameter Comparison

Parameter	0673003.MXEP (Original)	0875003.MXEP (Substitute)
Manufacturer	Littelfuse Inc.	Littelfuse Inc.
Current Rating (Amps)	3 A	3 A
Voltage Rating - AC	250 V	250 V
Fuse Type	Cartridge, Glass	Cartridge, Ceramic
Response Time	Slow Blow	Slow Blow
Mounting Type	Through Hole	Through Hole
Package / Case	Cartridge, Non-Standard (Axial)	Cartridge, Non-Standard (Axial)
Breaking Capacity @ Rated Voltage	50 A	50 A
Melting I²t	18.4	24.5
DC Cold Resistance (Ohms)	0.0247	0.0171
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)
Product Status	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Approvals	CSA, UL	cULus
Operating Temperature Range	Not specified	-55°C ~ 125°C

Engineering Selection Recommendations

The 0875003.MXEP serves as the active production substitute for the obsolete 0673003.MXEP. Both components maintain identical electrical performance specifications across current rating, voltage rating, response time, and breaking capacity. The substitute part carries active product status with cULus certification, providing enhanced regulatory coverage compared to the original CSA and UL approvals.

Physical dimensions differ slightly between the two cartridges due to material composition differences. The ceramic construction of the substitute yields a marginally smaller form factor while maintaining axial cartridge configuration compatibility with through-hole mounting applications. Both parts maintain ROHS3 compliance and REACH unaffected status.

The substitute's higher melting I²t value (24.5 versus 18.4) and lower DC cold resistance (0.0171 versus 0.0247 Ohms) reflect material property differences inherent to ceramic versus glass construction. These variations do not affect functional substitution for applications designed around the original 3A 250VAC slow-blow specification.

Frequently Asked Questions (FAQ)

Q: Can the 0875003.MXEP directly replace the 0673003.MXEP in existing designs?

A: Yes. Both components share identical electrical ratings (3A, 250VAC, slow-blow, 50A breaking capacity) and through-hole axial mounting configuration. The ceramic construction of the substitute does not affect electrical performance for applications specified around these parameters.

Q: What are the physical dimension differences between these parts?

A: The original glass cartridge measures 0.154" diameter by 0.433" length (3.90mm x 11.00mm). The ceramic substitute measures 0.142" diameter by 0.394" length (3.60mm x 10.00mm). Both maintain non-standard axial cartridge form factor. Verify mechanical clearance in your specific mounting application.

Q: Are there regulatory or certification differences?

A: The original part carries CSA and UL approvals. The substitute carries cULus certification, which encompasses both UL and CSA standards. Both parts maintain ROHS3 compliance and REACH unaffected status.

Q: Why does the substitute have a higher melting I²t value?

A: The melting I²t difference (24.5 versus 18.4) results from material composition differences between ceramic and glass cartridge construction. This does not affect functional performance for the specified 3A 250VAC slow-blow application.

Q: Is the substitute part currently available?

A: Yes. The 0875003.MXEP maintains active product status with 1000 pieces in stock, compared to the obsolete 0673003.MXEP status.

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