Littelfuse 0312003.MXP Glass Cartridge Fuse 3A 250VAC Equivalent & Substitute Parts

Part Overview

The Littelfuse 0312003.MXP is a 3 A, 250 V AC/DC fast-blow glass cartridge fuse in the 3AB/3AG package format (1/4" x 1-1/4"). This fuse is designed for circuit protection in applications requiring fast response characteristics and is currently in active product status with 12,307 units in stock. Equivalent and substitute parts are necessary when the primary part becomes unavailable or when alternative manufacturer options are required for supply chain flexibility while maintaining identical electrical and mechanical performance.

Key Parameters

Parameter	Value
Current Rating	3 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
Breaking Capacity @ Rated Voltage	100A (main part)
Operating Temperature Range	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution eligibility for the Littelfuse 0312003.MXP is determined by the following critical parameters:

Current Rating: 3 A (exact match required)
Voltage Rating: 250 V AC (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Fast Blow (exact match required)
Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
Mounting Type: Requires Holder (exact match required)
Operating Temperature Range: -55°C ~ 125°C (exact match required)
RoHS and REACH Compliance: ROHS3 Compliant, REACH Unaffected (exact match required)

All substitute parts listed meet these criteria. Variations in breaking capacity, melting I²t, and DC cold resistance do not disqualify substitution when all primary electrical and mechanical parameters align.

Parameter Comparison

Parameter	0312003.MXP (Littelfuse)	0312003.HXP (Littelfuse)	0312003.VXP (Littelfuse)	0034.5135 (SCHURTER)	3AG 3-R (Bel Fuse)	BK/AGC-3-R (Eaton)
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	SCHURTER Inc.	Bel Fuse Inc.	Eaton - Electronics Division
Current Rating (Amps)	3 A	3 A	3 A	3 A	3 A	3 A
Voltage Rating - AC	250 V	250 V	250 V	250 V	250 V	250 V
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Response Time	Fast Blow	Fast Blow	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"	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 1.250" L (6.35mm x 31.75mm)	0.250" Dia x 1.252" L (6.35mm x 31.80mm)	0.250" Dia x 1.252" L (6.35mm x 31.80mm)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)
Mounting Type	Requires Holder	Requires Holder	Requires Holder	Requires Holder	Requires Holder	Requires Holder
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Breaking Capacity @ Rated Voltage	100A	100A	100A	200A	200A	100A
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected
Product Status	Active	Active	Active	Obsolete	Active	Active
Approval Agency	CE, CSA, KC, PSE, UL	CE, CSA, KC, PSE, UL	CE, CSA, KC, PSE, UL	CSA, UL	CE, CSA, cURus, PSE	CSA, UL

Engineering Selection Recommendations

For active production applications, select from the following substitute parts based on product status and compliance requirements:

Littelfuse 0312003.HXP and 0312003.VXP are direct Littelfuse alternatives with identical electrical specifications, package dimensions, and approval certifications (CE, CSA, KC, PSE, UL). Both parts maintain active product status and are suitable for direct substitution without design modification.

Bel Fuse 3AG 3-R is an active product with equivalent electrical performance and approval certifications (CE, CSA, cURus, PSE). This part is suitable for applications where multi-source qualification is required.

Eaton BK/AGC-3-R is an active product with equivalent electrical performance and CSA/UL approval. This part is suitable for applications where Eaton component qualification is established.

SCHURTER 0034.5135 carries obsolete product status and should not be selected for new designs or ongoing production applications. This part is listed for reference only in legacy system documentation.

Frequently Asked Questions (FAQ)

Q: Can I substitute the Littelfuse 0312003.MXP with any of the listed alternatives without circuit modification?

A: Yes. All listed substitute parts share identical current rating (3 A), voltage rating (250 V AC), fuse type (cartridge glass), response time (fast blow), package format (3AB/3AG), and mounting requirements. No circuit modification is required.

Q: What is the difference between the Littelfuse variants (0312003.MXP, 0312003.HXP, 0312003.VXP)?

A: All three Littelfuse parts are electrically and mechanically identical. The suffix designations (.MXP, .HXP, .VXP) represent different packaging or distribution channel variants from Littelfuse Inc. They are interchangeable for circuit protection purposes.

Q: Why is SCHURTER 0034.5135 listed if it is obsolete?

A: The SCHURTER part is included for reference in legacy system documentation and supply chain history. For new designs and ongoing production, select from active status alternatives only.

Q: Are there dimensional differences between substitute parts?

A: Minor dimensional variation exists. The Littelfuse and Eaton parts measure 0.250" Dia x 1.250" L (6.35mm x 31.75mm), while SCHURTER and Bel Fuse parts measure 0.250" Dia x 1.252" L (6.35mm x 31.80mm). Both dimensions are compatible with standard 3AB/3AG fuse holders.

Q: Which substitute part has the highest breaking capacity?

A: SCHURTER 0034.5135 and Bel Fuse 3AG 3-R both have 200A breaking capacity at rated voltage, compared to 100A for Littelfuse and Eaton parts. Higher breaking capacity does not affect substitution eligibility when all primary electrical parameters match.

Q: What approval certifications should I verify for my application?

A: Littelfuse 0312003.MXP, 0312003.HXP, and 0312003.VXP carry the broadest certification set (CE, CSA, KC, PSE, UL). Bel Fuse 3AG 3-R includes CE, CSA, cURus, and PSE. Eaton BK/AGC-3-R and SCHURTER 0034.5135 include CSA and UL. Select the part whose certifications align with your application requirements.

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