Littelfuse 031202.5MXP Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 031202.5MXP is a 2.5 A, 250 V AC/DC fast-blow glass cartridge fuse in 3AB/3AG package format (1/4" x 1-1/4"). This component is designed for circuit protection in applications requiring reliable overcurrent interruption. The part is currently active in production with 662 units in stock. Equivalent and substitute parts are identified for applications where the original part number is unavailable or where alternative manufacturers' components meet the same electrical and mechanical specifications.

Key Parameters

Parameter	Specification
Current Rating	2.5 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Fast Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (6.35mm x 31.75mm)
Mounting Type	Requires Holder
Operating Temperature Range	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant
Approval Agencies	CE, CSA, KC, PSE, UL

Substitute Part Grouping Explanation

Substitution eligibility for the 031202.5MXP is determined by the following critical parameters:

Current Rating: Must be 2.5 A
Voltage Rating (AC): Must be 250 V
Fuse Type: Must be Cartridge, Glass
Response Time: Must be Fast Blow
Package / Case: Must be 3AB, 3AG, 1/4" x 1-1/4" (6.35mm x 31.75mm)
Mounting Type: Must require holder compatibility

All identified substitute parts meet these core electrical and mechanical parameters. Variations in secondary parameters such as breaking capacity, melting I²t, DC cold resistance, and operating temperature range do not preclude substitution when the primary parameters align.

Parameter Comparison

Parameter	031202.5MXP (Littelfuse)	031202.5HXP (Littelfuse)	0001.1028 (SCHURTER)	BK/AGC-2-1/2-R (Eaton)
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	SCHURTER Inc.	Eaton - Electronics Division
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
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Response Time	Fast Blow	Fast Blow	Fast Blow	Fast Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"
Size / Dimension	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	0.250" Dia x 1.252" L (6.35mm x 31.80mm)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)
Breaking Capacity @ Rated Voltage	100A	100A	1.5kA	100A
Melting I²t	9.54	9.54	4.1	28.688
DC Cold Resistance	0.0513 Ohms	0.0513 Ohms	Not provided	0.045 Ohms
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 85°C	-55°C ~ 125°C
Product Status	Active	Active	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	CE, CSA, KC, PSE, UL	CE, CSA, KC, PSE, UL	None listed	CSA, UL

Engineering Selection Recommendations

031202.5HXP (Littelfuse): Direct equivalent from the same manufacturer. Identical electrical and mechanical specifications with higher inventory availability (2537 units). Maintains all original certifications and compliance status. Recommended as primary substitute for 031202.5MXP.

BK/AGC-2-1/2-R (Eaton - Electronics Division): Parametric equivalent meeting all core electrical and mechanical requirements. Active product status with CSA and UL certifications. Suitable for applications where multi-source component strategy is required. Note: Melting I²t value (28.688) differs from the main part; verify thermal response characteristics for time-critical protection circuits.

0001.1028 (SCHURTER): Meets core electrical and mechanical parameters but carries obsolete product status. Operating temperature range (-40°C ~ 85°C) is narrower than the main part. Approval agency certifications are not listed. Use only when no active alternatives are available and application temperature requirements fall within the specified range.

Frequently Asked Questions (FAQ)

Q: Can 031202.5HXP be used as a direct replacement for 031202.5MXP?

A: Yes. Both parts are manufactured by Littelfuse with identical current rating (2.5 A), voltage rating (250 V), fuse type (cartridge, glass), response time (fast blow), and package format (3AB, 3AG, 1/4" x 1-1/4"). All electrical and mechanical parameters are equivalent.

Q: What is the difference between the Littelfuse and Eaton fuses?

A: Both meet the same core electrical specifications (2.5 A, 250 V, fast blow, 3AB/3AG package). The Eaton BK/AGC-2-1/2-R has a higher melting I²t value (28.688 vs. 9.54), indicating different thermal response characteristics. Both are active products with appropriate certifications for general circuit protection applications.

Q: Why is the SCHURTER 0001.1028 listed as obsolete?

A: The SCHURTER part carries an obsolete product status designation. While it meets the core electrical and mechanical parameters, it is no longer in active production. This part should be considered only when active alternatives are unavailable and application requirements align with its specified operating temperature range (-40°C ~ 85°C).

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (031202.5HXP, BK/AGC-2-1/2-R, and 0001.1028) are ROHS3 compliant.

Q: What certifications should I verify for my application?

A: The 031202.5MXP carries CE, CSA, KC, PSE, and UL certifications. The 031202.5HXP maintains identical certifications. The Eaton BK/AGC-2-1/2-R carries CSA and UL certifications. The SCHURTER 0001.1028 has no listed approval agencies. Verify that the selected substitute meets your application's specific regulatory requirements.

Q: Can I use these fuses in high-temperature environments?

A: The 031202.5MXP, 031202.5HXP, and BK/AGC-2-1/2-R are rated for -55°C ~ 125°C operation. The SCHURTER 0001.1028 is rated for -40°C ~ 85°C. Select the appropriate part based on your application's operating temperature requirements.

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