Littelfuse 031501.5VXP Glass Cartridge Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 031501.5VXP is a 1.5 A, 250 V AC/DC slow-blow glass cartridge fuse designed for through-hole mounting in 3AB and 3AG package configurations. This fuse is classified as Active product status and carries multiple international approvals including CE, CSA, PSE, and UL certifications. Substitute parts are identified when identical electrical and mechanical parameters are maintained across the product line, ensuring direct interchangeability without circuit redesign or performance compromise.

Key Parameters

Parameter	Specification
Manufacturer Part Number	031501.5VXP
Manufacturer	Littelfuse Inc.
Current Rating	1.5 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (Axial)
Mounting Type	Through Hole
Breaking Capacity @ Rated Voltage	100 A
Melting I²t	38
Operating Temperature Range	-55°C ~ 125°C
Size / Dimension	0.275" Dia x 1.275" L (6.99mm x 32.39mm)
DC Cold Resistance	0.191 Ohms
Approval Agencies	CE, CSA, PSE, UL
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the 031501.5VXP are identified based on strict parametric equivalence. The following electrical and mechanical parameters must remain identical for direct substitution:

Current Rating: 1.5 A
Voltage Rating (AC): 250 V
Fuse Type: Cartridge, Glass
Response Time: Slow Blow
Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (Axial)
Mounting Type: Through Hole
Breaking Capacity @ Rated Voltage: 100 A
Melting I²t: 38
Operating Temperature Range: -55°C ~ 125°C
Size / Dimension: 0.275" Dia x 1.275" L (6.99mm x 32.39mm)
DC Cold Resistance: 0.191 Ohms
Approval Agencies: CE, CSA, PSE, UL
RoHS Status: ROHS3 Compliant

The substitute parts 031501.5HXP and 031501.5MXP meet all these criteria and are therefore direct parametric equivalents suitable for interchangeable use in applications requiring the 031501.5VXP.

Parameter Comparison

Parameter	031501.5VXP	031501.5HXP	031501.5MXP
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.
Current Rating (Amps)	1.5 A	1.5 A	1.5 A
Voltage Rating - AC	250 V	250 V	250 V
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Response Time	Slow Blow	Slow Blow	Slow Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (Axial)	3AB, 3AG, 1/4" x 1-1/4" (Axial)	3AB, 3AG, 1/4" x 1-1/4" (Axial)
Mounting Type	Through Hole	Through Hole	Through Hole
Breaking Capacity @ Rated Voltage	100 A	100 A	100 A
Melting I²t	38	38	38
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Size / Dimension	0.275" Dia x 1.275" L (6.99mm x 32.39mm)	0.275" Dia x 1.275" L (6.99mm x 32.39mm)	0.275" Dia x 1.275" L (6.99mm x 32.39mm)
DC Cold Resistance	0.191 Ohms	0.191 Ohms	0.191 Ohms
Approval Agency	CE, CSA, PSE, UL	CE, CSA, PSE, UL	CE, CSA, PSE, UL
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active
Series	315	315	315

Engineering Selection Recommendations

All three parts—031501.5VXP, 031501.5HXP, and 031501.5MXP—maintain Active product status from Littelfuse Inc. and carry identical international compliance certifications (CE, CSA, PSE, UL). Each part is ROHS3 compliant and carries REACH Unaffected status. Selection between these parts may be based on inventory availability and lead time considerations, as all electrical and mechanical parameters are identical. The 031501.5MXP currently maintains the highest inventory level at 1884 pieces, followed by 031501.5VXP at 972 pieces and 031501.5HXP at 947 pieces.

Frequently Asked Questions (FAQ)

Q: Can 031501.5HXP or 031501.5MXP be used as direct replacements for 031501.5VXP?

A: Yes. All three parts are parametric equivalents with identical current ratings (1.5 A), voltage ratings (250 V AC), fuse types (Cartridge, Glass), response times (Slow Blow), package configurations (3AB, 3AG), and all other electrical and mechanical specifications. Direct substitution is supported without circuit modification.

Q: Are there any differences in approval certifications between these parts?

A: No. All three parts carry identical approval certifications: CE, CSA, PSE, and UL. RoHS3 compliance and REACH Unaffected status are consistent across all variants.

Q: What determines the interchangeability of these fuse parts?

A: Interchangeability is determined by matching current rating, voltage rating, fuse type, response time, package configuration, mounting type, breaking capacity, melting I²t value, operating temperature range, physical dimensions, and DC cold resistance. All substitute parts maintain these parameters identically to the main part.

Q: Are there any physical or dimensional differences between 031501.5VXP, 031501.5HXP, and 031501.5MXP?

A: No. All three parts share identical physical dimensions of 0.275" diameter by 1.275" length (6.99mm x 32.39mm) and are configured for the same 3AB and 3AG package standards with 1/4" x 1-1/4" axial through-hole mounting.

Q: What is the significance of the different part number suffixes (VXP, HXP, MXP)?

A: The suffixes indicate different manufacturing variants within the Littelfuse 315 series. Despite the different designations, these parts are parametric equivalents meeting identical electrical and mechanical specifications for the 1.5 A, 250 V slow-blow cartridge fuse category.

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