Littelfuse 03152.25H Glass Cartridge Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 03152.25H is a 2.25 A, 250 V AC/DC slow-blow glass cartridge fuse in the 3AB/3AG package format (1/4" x 1-1/4" axial). This component is classified as obsolete, making equivalent substitute parts necessary for ongoing circuit protection applications. The fuse is designed for through-hole mounting and provides 100 A breaking capacity at rated voltage with a melting I²t of 121.

Key Parameters

Parameter	Value
Current Rating	2.25 A
Voltage Rating (AC)	250 V
Response Time	Slow Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (Axial)
Fuse Type	Cartridge, Glass
Mounting Type	Through Hole
Breaking Capacity @ Rated Voltage	100 A
Melting I²t	121
Operating Temperature Range	-55°C ~ 125°C
Size / Dimension	0.275" Dia x 1.275" L (6.99mm x 32.39mm)
DC Cold Resistance	0.096 Ohms

Substitute Part Grouping Explanation

Substitute parts for the 03152.25H are qualified based on strict electrical and mechanical parameter matching:

Critical Matching Parameters:

Current Rating: 2.25 A (exact match required)
Voltage Rating: 250 V AC (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: 100 A (exact match required)
Melting I²t: 121 (exact match required)
Operating Temperature Range: -55°C ~ 125°C (exact match required)
Physical Dimensions: 0.275" Dia x 1.275" L (exact match required)

All three substitute parts (03152.25HXP, 03152.25MXP, 03152.25VXP) meet these critical parameters and are therefore direct functional equivalents.

Parameter Comparison

Parameter	03152.25H (Main)	03152.25HXP	03152.25MXP	03152.25VXP
Current Rating (Amps)	2.25 A	2.25 A	2.25 A	2.25 A
Voltage Rating - AC	250 V	250 V	250 V	250 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)
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Breaking Capacity @ Rated Voltage	100 A	100 A	100 A	100 A
Melting I²t	121	121	121	121
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	0.096 Ohms	0.0968 Ohms	0.0968 Ohms	0.0968 Ohms
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All three substitute parts (03152.25HXP, 03152.25MXP, 03152.25VXP) are functionally equivalent to the 03152.25H and provide direct replacement capability. The primary distinction between substitutes is product status and regulatory compliance:

03152.25HXP: Active product status with CE, CSA, K-MARK, PSE, and UL certifications. ROHS3 compliant. Recommended for new designs and applications requiring current regulatory compliance.

03152.25MXP: Active product status with CE, CSA, K-MARK, PSE, and UL certifications. ROHS3 compliant. Suitable for applications requiring K-MARK certification.

03152.25VXP: Active product status with CE, CSA, KC, PSE, and UL certifications. ROHS3 compliant. Highest inventory availability (1141 Pcs). Suitable for applications requiring KC certification.

The obsolete 03152.25H should be replaced with any of these active equivalents. All substitute parts maintain identical electrical performance and physical compatibility while offering improved regulatory compliance and ongoing availability.

Frequently Asked Questions (FAQ)

Q: Can the 03152.25HXP, 03152.25MXP, or 03152.25VXP be used as direct replacements for the 03152.25H?

A: Yes. All three parts are direct functional equivalents. They share identical current rating (2.25 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 (121), and physical dimensions. They are mechanically and electrically interchangeable.

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

A: The three substitutes differ in regulatory certifications and inventory levels. 03152.25HXP includes CE, CSA, K-MARK, PSE, and UL certifications. 03152.25MXP includes CE, CSA, K-MARK, PSE, and UL certifications. 03152.25VXP includes CE, CSA, KC, PSE, and UL certifications with the highest inventory availability (1141 Pcs). All are ROHS3 compliant.

Q: Why is the 03152.25H classified as obsolete?

A: The 03152.25H is no longer in active production. The active equivalents (03152.25HXP, 03152.25MXP, 03152.25VXP) provide the same functionality with current regulatory compliance and ongoing manufacturer support.

Q: Are there any differences in DC cold resistance between the main part and substitutes?

A: The 03152.25H has a DC cold resistance of 0.096 Ohms, while all three substitutes measure 0.0968 Ohms. This minor variation (approximately 0.8%) is within normal manufacturing tolerance and does not affect circuit protection performance.

Q: Which substitute should I select for new designs?

A: For new designs, select based on required regulatory certifications. 03152.25HXP or 03152.25MXP are suitable for applications requiring K-MARK certification. 03152.25VXP is suitable for applications requiring KC certification. All three are ROHS3 compliant and carry UL, CSA, and PSE certifications.

Q: Are all substitutes available in the same packaging format?

A: Yes. All substitute parts use identical 3AB, 3AG package format (1/4" x 1-1/4" axial) with through-hole mounting, ensuring direct mechanical compatibility with existing PCB designs.

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