Littelfuse 031503.2H Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 031503.2H is a 3.2 A, 250 V AC/DC slow-blow glass cartridge fuse in the 3AB/3AG package format (1/4" x 1-1/4" axial). This fuse is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new designs. The substitute parts listed maintain identical electrical and mechanical specifications while offering improved compliance status and active product availability.

Key Parameters

Parameter	Specification
Current Rating	3.2 A
Voltage Rating (AC)	250 V
Response Time	Slow Blow
Fuse Type	Cartridge, Glass
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (Axial)
Mounting Type	Through Hole
Breaking Capacity @ Rated Voltage	100 A
Melting I²t	209
Operating Temperature Range	-55°C to 125°C
Size / Dimension	0.275" Dia x 1.275" L (6.99mm x 32.39mm)
DC Cold Resistance	0.0525 Ohms (main part)

Substitute Part Grouping Explanation

Substitution eligibility for the 031503.2H is determined by the following critical parameters:

Current Rating: 3.2 A (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Response Time: Slow Blow (exact match required)
Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (Axial) (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Mounting Type: Through Hole (exact match required)
Breaking Capacity @ Rated Voltage: 100 A (exact match required)
Melting I²t: 209 (exact match required)
Operating Temperature Range: -55°C to 125°C (exact match required)
Size / Dimension: 0.275" Dia x 1.275" L (6.99mm x 32.39mm) (exact match required)

All three substitute parts (031503.2HXP, 031503.2MXP, 031503.2VXP) meet these criteria and are direct parametric equivalents to the 031503.2H.

Parameter Comparison

Parameter	031503.2H (Main)	031503.2HXP	031503.2MXP	031503.2VXP
Current Rating (Amps)	3.2 A	3.2 A	3.2 A	3.2 A
Voltage Rating - AC	250 V	250 V	250 V	250 V
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow Blow
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
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)	3AB, 3AG, 1/4" x 1-1/4" (Axial)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Breaking Capacity @ Rated Voltage	100 A	100 A	100 A	100 A
Melting I²t	209	209	209	209
Operating Temperature	-55°C ~ 125°C	-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)	0.275" Dia x 1.275" L (6.99mm x 32.39mm)
DC Cold Resistance	0.0525 Ohms	0.0529 Ohms	0.0529 Ohms	0.0529 Ohms
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	CSA, METI, UL	CE, CSA, K-MARK, PSE, UL	CE, CSA, K-MARK, PSE, UL	CE, CSA, KC, PSE, UL

Engineering Selection Recommendations

All three substitute parts are parametrically equivalent to the 031503.2H and are suitable for direct replacement in applications requiring a 3.2 A, 250 V AC/DC slow-blow glass cartridge fuse in the 3AB/3AG package.

031503.2HXP is recommended as the primary substitute. It maintains active product status, achieves ROHS3 compliance, and carries CE, CSA, K-MARK, PSE, and UL certifications. This part offers the broadest regulatory approval coverage.

031503.2MXP and 031503.2VXP are alternative equivalents with identical electrical and mechanical specifications. Both are active products with ROHS3 compliance. 031503.2MXP carries CE, CSA, K-MARK, PSE, and UL certifications. 031503.2VXP carries CE, CSA, KC, PSE, and UL certifications. Selection between these alternatives should be based on specific regional certification requirements and supply chain availability.

The DC cold resistance variance (0.0525 Ohms for 031503.2H versus 0.0529 Ohms for all substitutes) is within acceptable tolerance for fuse applications and does not affect functional compatibility.

Frequently Asked Questions (FAQ)

Q: Can 031503.2HXP, 031503.2MXP, and 031503.2VXP be used interchangeably with 031503.2H?

A: Yes. All three substitute parts are parametrically equivalent to the 031503.2H. They share identical current rating (3.2 A), voltage rating (250 V AC), response time (slow blow), package format (3AB/3AG, 1/4" x 1-1/4"), breaking capacity (100 A), melting I²t (209), and operating temperature range (-55°C to 125°C). Direct substitution is supported.

Q: Why is the 031503.2H classified as obsolete?

A: The 031503.2H is no longer in active production. The substitute parts listed (031503.2HXP, 031503.2MXP, 031503.2VXP) are active products that provide equivalent functionality with improved compliance status and ongoing availability.

Q: What is the difference between the three substitute parts?

A: The three substitute parts are parametrically identical in all critical electrical and mechanical specifications. The primary differences are in regional certifications: 031503.2HXP and 031503.2MXP carry K-MARK certification, while 031503.2VXP carries KC certification instead. Selection should be based on regional regulatory requirements and supply availability.

Q: Are the substitute parts RoHS compliant?

A: Yes. All three substitute parts (031503.2HXP, 031503.2MXP, 031503.2VXP) are ROHS3 compliant. The original 031503.2H is RoHS non-compliant.

Q: Does the DC cold resistance difference affect fuse performance?

A: No. The DC cold resistance of the substitute parts (0.0529 Ohms) differs minimally from the original part (0.0525 Ohms). This variance is within acceptable tolerance for fuse applications and does not affect functional performance or circuit protection characteristics.

Q: What certifications do the substitute parts carry?

A: 031503.2HXP carries CE, CSA, K-MARK, PSE, and UL certifications. 031503.2MXP carries CE, CSA, K-MARK, PSE, and UL certifications. 031503.2VXP carries CE, CSA, KC, PSE, and UL certifications. All three parts meet major regional safety standards.

Q: Can these fuses be used in both AC and DC circuits?

A: Yes. All parts in this series are rated for 250 V AC/DC operation, supporting both alternating and direct current applications within the specified voltage and current limits.

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