Littelfuse 032502.5H Ceramic Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 032502.5H is a 2.5 A, 250 V AC ceramic cartridge fuse in 3AB/3AG package format (1/4" x 1-1/4" axial). This fuse is classified as obsolete product status. Equivalent and substitute parts are necessary to maintain circuit protection functionality in applications where the original part is no longer readily available or where enhanced specifications are required for modern compliance standards.

Key Parameters

Parameter	Value
Current Rating	2.5 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Ceramic
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	136
Size / Dimension	0.275" Dia x 1.288" L (6.99mm x 32.72mm)
DC Cold Resistance	0.083 Ohms

Substitute Part Grouping Explanation

Substitute parts for the 032502.5H are qualified based on the following critical parameters:

Current Rating: 2.5 A (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Fuse Type: Cartridge, Ceramic (exact match required)
Response Time: Slow Blow (exact match required)
Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (Axial) (exact match required)
Mounting Type: Through Hole (exact match required)
Melting I²t: 136 (exact match required)
Size / Dimension: 0.275" Dia x 1.288" L (6.99mm x 32.72mm) (exact match required)

The substitute parts 032502.5HXP, 032502.5MXP, and 032502.5VXP meet all critical electrical and mechanical parameters. These parts are active product status variants that provide enhanced DC voltage rating (125 V DC) and improved compliance certifications compared to the obsolete main part.

Parameter Comparison

Parameter	032502.5H (Main)	032502.5HXP	032502.5MXP	032502.5VXP
Current Rating (Amps)	2.5 A	2.5 A	2.5 A	2.5 A
Voltage Rating - AC	250 V	250 V	250 V	250 V
Voltage Rating - DC	Not specified	125 V	125 V	125 V
Response Time	Slow Blow	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)	3AB, 3AG, 1/4" x 1-1/4" (Axial)
Breaking Capacity @ Rated Voltage	100 A	100 A AC, 10 kA DC	100 A AC, 10 kA DC	100 A AC, 10 kA DC
Melting I²t	136	136	136	136
Size / Dimension	0.275" Dia x 1.288" L (6.99mm x 32.72mm)	0.275" Dia x 1.288" L (6.99mm x 32.72mm)	0.275" Dia x 1.288" L (6.99mm x 32.72mm)	0.275" Dia x 1.288" L (6.99mm x 32.72mm)
DC Cold Resistance	0.083 Ohms	0.0835 Ohms	0.0835 Ohms	0.0835 Ohms
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Operating Temperature	Not specified	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Approval Agency	CSA, 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 (032502.5HXP, 032502.5MXP, 032502.5VXP) are direct functional equivalents to the 032502.5H with identical electrical and mechanical specifications for AC circuit protection applications.

The substitute parts offer the following advantages over the obsolete main part:

Active product status ensures ongoing availability and supply chain continuity
ROHS3 compliance meets current environmental and regulatory requirements
Enhanced DC voltage rating (125 V) provides expanded application flexibility
Increased breaking capacity for DC circuits (10 kA DC vs. unspecified for main part)
Broader approval agency certifications (CE, CSA, K-MARK, PSE, UL) support international market requirements
Specified operating temperature range (-55°C ~ 125°C) enables use in wider environmental conditions

Selection among the three substitute parts depends on specific regional certification requirements and supply availability. All three parts are electrically and mechanically interchangeable with the 032502.5H.

Frequently Asked Questions (FAQ)

Q: Can 032502.5HXP, 032502.5MXP, and 032502.5VXP be used interchangeably with 032502.5H?

A: Yes. All three substitute parts meet the critical electrical parameters (2.5 A, 250 V AC, Slow Blow response) and mechanical specifications (3AB/3AG package, 1/4" x 1-1/4" axial dimensions) required for direct substitution in circuits designed for the 032502.5H.

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

A: The three substitute parts are parametrically equivalent. The primary differences are regional approval certifications: 032502.5HXP includes K-MARK certification, 032502.5MXP includes K-MARK certification, and 032502.5VXP includes KC certification. All three are ROHS3 compliant and active product status.

Q: Why should I use a substitute part instead of the original 032502.5H?

A: The 032502.5H is obsolete product status. Substitute parts ensure supply chain continuity, provide ROHS3 compliance for modern manufacturing standards, and offer enhanced DC voltage rating and broader international certifications.

Q: Are the physical dimensions identical?

A: Yes. All substitute parts maintain the same 3AB/3AG package format with dimensions of 0.275" Dia x 1.288" L (6.99mm x 32.72mm), ensuring direct mechanical compatibility in existing through-hole mounting applications.

Q: What is the DC voltage rating for the original 032502.5H?

A: The DC voltage rating for the 032502.5H is not specified in the technical data. The substitute parts provide a specified 125 V DC rating, which represents an enhancement for DC circuit applications.

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