Littelfuse 0498040.MXT Automotive Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0498040.MXT is a 40 A automotive fuse rated for 32 V DC operation, designed for bolt mount installation in automotive electrical systems. This MIDI® 498 series fuse features slow-blow response characteristics and is classified as an active product. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, and functional specifications to ensure direct interchangeability in automotive applications.

Key Parameters

Parameter	Value
Current Rating	40 A
Voltage Rating (DC)	32 V
Fuse Type	Automotive
Response Time	Slow Blow
Mounting Type	Bolt Mount
Package / Case	Auto Link
Breaking Capacity @ Rated Voltage	1 kA
Size / Dimension	1.614" L x 0.472" W x 0.315" H (41.00 mm x 12.00 mm x 8.00 mm)
Operating Temperature Range	-40°C to 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 0498040.MXT is determined by the following critical parameters:

Current Rating: 40 A (exact match required)
Voltage Rating (DC): 32 V (exact match required)
Fuse Type: Automotive (exact match required)
Response Time: Slow Blow (exact match required)
Mounting Type: Bolt Mount (exact match required)
Package / Case: Auto Link (exact match required)
Physical Dimensions: 1.614" L x 0.472" W x 0.315" H / 41.00 mm x 12.00 mm x 8.00 mm (exact match required)
Operating Temperature Range: -40°C to 125°C (exact match required)
Breaking Capacity: 1 kA (exact match required)

All identified substitute parts match these core parameters and are manufactured by Littelfuse Inc. within the MIDI® 498 series. Variations in approval agency certifications and DC cold resistance values do not affect functional interchangeability.

Parameter Comparison

Part Number	Manufacturer	Current Rating (A)	Voltage Rating (DC)	Response Time	Mounting Type	Package / Case	Breaking Capacity (kA)	Size (mm)	Operating Temp (°C)	RoHS Status	Product Status	Inventory (Pcs)
0498040.MXT	Littelfuse Inc.	40	32	Slow Blow	Bolt Mount	Auto Link	1	41.00 x 12.00 x 8.00	-40 to 125	ROHS3 Compliant	Active	1268
0498040.H	Littelfuse Inc.	40	32	Slow Blow	Bolt Mount	Auto Link	1	41.00 x 12.00 x 8.00	-40 to 125	ROHS3 Compliant	Active	752
0498040.M	Littelfuse Inc.	40	32	Slow Blow	Bolt Mount	Auto Link	1	41.00 x 12.00 x 8.00	-40 to 125	ROHS3 Compliant	Active	1788
0498040.MX1M6	Littelfuse Inc.	40	32	Slow Blow	Bolt Mount	Auto Link	1	41.00 x 12.00 x 8.00	-40 to 125	ROHS3 Compliant	Active	999
0498040.TXN	Littelfuse	40	32	Slow Blow	Bolt Mount	Auto Link	1	41.00 x 12.00 x 8.00	-40 to 125	ROHS3 Compliant	Active	1007

Engineering Selection Recommendations

All substitute parts listed are active products manufactured by Littelfuse Inc. and maintain full ROHS3 compliance. Selection among equivalent parts may be based on:

Approval agency requirements: 0498040.M carries UL approval; 0498040.MX1M6 carries UR approval; 0498040.MXT, 0498040.H, and 0498040.TXN do not specify approval agency designation.
Inventory availability: 0498040.M offers the highest stock level at 1788 pieces; 0498040.MXT provides 1268 pieces; 0498040.TXN provides 1007 pieces; 0498040.MX1M6 provides 999 pieces; 0498040.H provides 752 pieces.
DC cold resistance specifications: All parts specify 0.001398 Ohms except 0498040.M at 0.0013 Ohms, representing negligible operational difference.

Frequently Asked Questions (FAQ)

Q: Can 0498040.H be used as a direct replacement for 0498040.MXT?

A: Yes. Both parts share identical electrical ratings (40 A, 32 V DC), response characteristics (slow blow), mechanical dimensions (41.00 mm x 12.00 mm x 8.00 mm), mounting configuration (bolt mount), and package type (auto link). Both are active products with ROHS3 compliance.

Q: What is the difference between 0498040.M and 0498040.MXT?

A: Both parts are functionally equivalent across all critical parameters. The primary difference is approval agency certification: 0498040.M carries UL approval while 0498040.MXT does not specify an approval agency. DC cold resistance differs marginally (0.0013 Ohms vs. 0498040.MXT at 0.001398 Ohms).

Q: Are all substitute parts suitable for automotive bolt mount applications?

A: Yes. All listed parts are classified as automotive fuses with bolt mount installation type and auto link package configuration, meeting the mechanical and electrical requirements for automotive electrical system integration.

Q: Does the color designation affect substitution compatibility?

A: No. Color is a visual identifier only and does not affect electrical or mechanical interchangeability. Parts with unspecified color designation (0498040.H and 0498040.M) are functionally equivalent to green-colored variants.

Q: Which substitute part should be selected for applications requiring specific regulatory approval?

A: Applications requiring UL approval should specify 0498040.M. Applications requiring UR approval should specify 0498040.MX1M6. Applications without specific approval requirements may use any listed equivalent part.

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