Littelfuse 031202.5H Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 031202.5H is a 2.5 A, 250 V AC/DC fast-blow glass cartridge fuse in the 3AB/3AG package format (1/4" x 1-1/4"). This component is classified as obsolete, requiring identification of active equivalent alternatives for continued system support and procurement.

Key Parameters

Parameter	Value
Current Rating	2.5 A
Voltage Rating (AC)	250 V
Response Time	Fast Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4"
Fuse Type	Cartridge, Glass
Mounting Type	Requires Holder
Operating Temperature Range	-55°C ~ 125°C
Size / Dimension	0.250" Dia x 1.250" L (6.35mm x 31.75mm)

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters:

Current Rating: 2.5 A (exact match required)
Voltage Rating: 250 V AC (exact match required)
Response Time: Fast Blow (exact match required)
Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Mounting Type: Requires Holder (exact match required)

All substitute parts listed below meet these core electrical and mechanical parameters. Variations in breaking capacity, melting I²t, DC cold resistance, and approval agencies are secondary characteristics that do not affect fundamental substitutability within the specified parameter set.

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage (AC)	Response Time	Package / Case	Breaking Capacity @ Rated Voltage	Melting I²t	DC Cold Resistance (Ohms)	Product Status	RoHS Status	Approval Agency
031202.5H	Littelfuse Inc.	2.5 A	250 V	Fast Blow	3AB, 3AG, 1/4" x 1-1/4"	35 A	9.54	0.051	Obsolete	RoHS non-compliant	CSA, UL
031202.5HXP	Littelfuse Inc.	2.5 A	250 V	Fast Blow	3AB, 3AG, 1/4" x 1-1/4"	100 A	9.54	0.0513	Active	ROHS3 Compliant	CE, CSA, KC, PSE, UL
031202.5MXP	Littelfuse Inc.	2.5 A	250 V	Fast Blow	3AB, 3AG, 1/4" x 1-1/4"	100 A	9.54	0.0513	Active	ROHS3 Compliant	CE, CSA, KC, PSE, UL
031202.5VXP	Littelfuse Inc.	2.5 A	250 V	Fast Blow	3AB, 3AG, 1/4" x 1-1/4"	100 A	9.54	0.0513	Active	ROHS3 Compliant	CE, CSA, KC, PSE, UL
AGC-2-1/2-R	Eaton - Electronics Division	2.5 A	250 V	Fast Blow	3AB, 3AG, 1/4" x 1-1/4"	100 A	28.688	0.045	Active	RoHS Compliant	CSA, UL
BK/AGC-2-1/2-R	Eaton - Electronics Division	2.5 A	250 V	Fast Blow	3AB, 3AG, 1/4" x 1-1/4"	100 A	28.688	0.045	Active	ROHS3 Compliant	CSA, UL
0001.1028	SCHURTER Inc.	2.5 A	250 V	Fast Blow	3AB, 3AG, 1/4" x 1-1/4"	1.5 kA	4.1	—	Obsolete	ROHS3 Compliant	—

Engineering Selection Recommendations

Primary Substitutes (Littelfuse Series 312): 031202.5HXP, 031202.5MXP, and 031202.5VXP are direct Littelfuse alternatives with active product status. All three carry ROHS3 compliance and expanded approval certifications (CE, CSA, KC, PSE, UL) compared to the obsolete 031202.5H. These parts maintain identical electrical parameters and package specifications.

Secondary Substitutes (Eaton AGC Series): AGC-2-1/2-R and BK/AGC-2-1/2-R are parametrically equivalent alternatives from Eaton - Electronics Division. Both maintain active product status with RoHS compliance. BK/AGC-2-1/2-R carries ROHS3 certification. These parts meet all core electrical and mechanical requirements.

Cross-Manufacturer Alternative: 0001.1028 (SCHURTER Inc.) meets all specified electrical and mechanical parameters but carries obsolete product status and lacks approval agency certifications. This part is not recommended for new designs.

Frequently Asked Questions (FAQ)

Q: Can 031202.5HXP, 031202.5MXP, and 031202.5VXP be used interchangeably with 031202.5H?

A: Yes. All three parts are parametrically equivalent to 031202.5H across current rating (2.5 A), voltage rating (250 V AC), response time (fast blow), package format (3AB/3AG, 1/4" x 1-1/4"), and operating temperature range (-55°C ~ 125°C). The primary advantage is active product status and enhanced compliance certifications.

Q: What is the difference between Littelfuse and Eaton fuse alternatives?

A: Both Littelfuse (031202.5HXP, 031202.5MXP, 031202.5VXP) and Eaton (AGC-2-1/2-R, BK/AGC-2-1/2-R) alternatives meet identical electrical and mechanical specifications. Differences exist in melting I²t values (9.54 for Littelfuse, 28.688 for Eaton) and DC cold resistance (0.0513 Ohms for Littelfuse, 0.045 Ohms for Eaton). Selection depends on system design requirements and supplier availability.

Q: Are all substitute parts RoHS compliant?

A: The Littelfuse alternatives (031202.5HXP, 031202.5MXP, 031202.5VXP) and Eaton BK/AGC-2-1/2-R carry ROHS3 compliance. Eaton AGC-2-1/2-R carries RoHS compliance. The original 031202.5H is RoHS non-compliant. SCHURTER 0001.1028 is ROHS3 compliant but obsolete.

Q: Can the 3AB/3AG package format be used with any standard fuse holder?

A: Yes. All substitute parts maintain the 3AB/3AG package format (1/4" x 1-1/4") and require a compatible fuse holder. Physical dimensions are consistent across all listed alternatives.

Q: Why is 0001.1028 listed if it is obsolete?

A: 0001.1028 is included for reference as a manufacturer-recommended equivalent that meets all specified electrical and mechanical parameters. However, obsolete status and lack of approval agency certifications make it unsuitable for new procurement or design implementation.

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