Littelfuse 0674.600MXE Equivalent & Substitute Parts

Part Overview

The Littelfuse 0674.600MXE is a 500 mA, 250 V AC/DC slow-blow glass cartridge fuse with axial through-hole mounting. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system maintenance and new design implementations. The glass cartridge construction provides visual indication of fuse status and is widely used in industrial and consumer electronics applications requiring reliable overcurrent protection.

Key Parameters

Parameter	Value
Current Rating	500 mA
Voltage Rating (AC)	250 V
Response Time	Slow Blow
Fuse Type	Cartridge, Glass
Mounting Type	Through Hole
Package / Case	Cartridge, Non-Standard (Axial)
Breaking Capacity @ Rated Voltage	50 A
Size / Dimension	0.154" Dia x 0.433" L (3.90mm x 11.00mm)
Approval Agency	CSA, UL
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the 0674.600MXE is determined by strict equivalence across the following critical parameters:

Current Rating: 500 mA (exact match required)
Voltage Rating: 250 V AC (exact match required)
Response Time: Slow Blow (exact match required)
Breaking Capacity: 50 A @ rated voltage (exact match required)
Mounting Type: Through Hole (exact match required)
Approval Certifications: CSA, UL or equivalent recognized standards

The Littelfuse 0875.500MXEP qualifies as a substitute based on matching all critical electrical parameters. While the fuse element material differs (ceramic vs. glass), both constructions meet the specified electrical performance requirements and approval standards. Physical dimensions show minor variation within acceptable tolerance for axial cartridge mounting applications.

Parameter Comparison

Parameter	0674.600MXE (Main Part)	0875.500MXEP (Substitute)
Manufacturer	Littelfuse Inc.	Littelfuse Inc.
Current Rating (Amps)	500 mA	500 mA
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	0.225 Ohms	0.256 Ohms
Melting I²t	0.137	0.288
Approval Agency	CSA, UL	cULus
Product Status	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

The Littelfuse 0875.500MXEP is the designated manufacturer substitute for the obsolete 0674.600MXE. Selection of this alternative is supported by:

Identical current and voltage ratings (500 mA, 250 V AC)
Matching slow-blow response characteristic
Equivalent breaking capacity (50 A @ rated voltage)
Active product status with current manufacturing availability
Recognized approval certifications (cULus) meeting or exceeding original UL/CSA requirements
Full ROHS3 compliance maintained

The ceramic cartridge construction of the 0875.500MXEP provides enhanced thermal stability and mechanical robustness compared to glass construction, with operating temperature range of -55°C to 125°C. Minor dimensional variation (0.142" Dia x 0.394" L vs. 0.154" Dia x 0.433" L) remains within acceptable mechanical tolerance for standard axial through-hole mounting footprints.

Frequently Asked Questions (FAQ)

Q: Can the 0875.500MXEP be used as a direct replacement for the 0674.600MXE?

A: Yes. Both components share identical electrical specifications: 500 mA current rating, 250 V AC voltage rating, slow-blow response, and 50 A breaking capacity. The ceramic construction of the substitute provides equivalent or superior performance to the original glass cartridge design.

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

A: Glass and ceramic are alternative materials for fuse element encapsulation. Both constructions meet the same electrical performance requirements when rated identically. Ceramic construction typically offers improved thermal stability and mechanical durability. The choice between materials does not affect electrical substitution compatibility when all other parameters match.

Q: Are there dimensional compatibility concerns with the substitute part?

A: The 0875.500MXEP has slightly smaller dimensions (0.142" Dia x 0.394" L) compared to the 0674.600MXE (0.154" Dia x 0.433" L). Both maintain axial cartridge form factor suitable for standard through-hole mounting. Verify mechanical fit within your specific fuse holder or socket design before implementation.

Q: What certifications apply to the substitute part?

A: The 0875.500MXEP carries cULus certification, which represents combined UL and CSA recognition. This certification status meets or exceeds the original part's CSA and UL approvals.

Q: Is the substitute part RoHS compliant?

A: Yes. The 0875.500MXEP is ROHS3 compliant, matching the compliance status of the original 0674.600MXE.

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