Equivalent & Substitute Parts for 0312002.MXP

Part Overview

The 0312002.MXP is a 2 A 250 V AC/DC fast-blow glass cartridge fuse manufactured by Littelfuse Inc. in the 312 series. This fuse is designed for 3AB and 3AG holder applications with dimensions of 0.250" diameter by 1.250" length (6.35mm x 31.75mm). The part is currently active in production with 8793 units in stock. Equivalent and substitute parts are necessary when the primary part becomes unavailable, when alternative manufacturers are preferred for supply chain optimization, or when design flexibility allows for functionally compatible alternatives that meet the same electrical and mechanical specifications.

Key Parameters

Parameter	Value
Current Rating	2 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Fast Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4"
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 0312002.MXP is determined by strict equivalence across the following critical parameters:

Current Rating: 2 A (exact match required)
Voltage Rating (AC): 250 V (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 Compliance: ROHS3 Compliant (exact match required)

All substitute parts listed below meet these criteria. Variations in secondary parameters such as breaking capacity, melting I²t, DC cold resistance, and specific approval agency combinations do not disqualify substitution when the primary electrical and mechanical parameters are identical.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (A)	Voltage Rating (V AC)	Response Time	Package / Case	Breaking Capacity @ Rated Voltage	Melting I²t	DC Cold Resistance (Ohms)	Product Status	Approval Agencies
0312002.MXP	Littelfuse Inc.	2	250	Fast Blow	3AB, 3AG, 1/4" x 1-1/4"	100A	5.2	0.0704	Active	CE, CSA, KC, PSE, UL
0312002.HXP	Littelfuse Inc.	2	250	Fast Blow	3AB, 3AG, 1/4" x 1-1/4"	100A	5.2	0.0704	Active	CE, CSA, KC, PSE, UL
0034.5131	SCHURTER Inc.	2	250	Fast Blow	3AB, 3AG, 1/4" x 1-1/4"	200A	Not Provided	Not Provided	Obsolete	CSA, UL
3AG 2-R	Bel Fuse Inc.	2	250	Fast Blow	3AB, 3AG, 1/4" x 1-1/4"	200A	7.2	0.063	Active	CE, CSA, cULus, PSE
AGC-2-R	Eaton - Electronics Division	2	250	Fast Blow	3AB, 3AG, 1/4" x 1-1/4"	100A	17.52	0.063	Active	CSA, UL
BK/AGC-2-R	Eaton - Electronics Division	2	250	Fast Blow	3AB, 3AG, 1/4" x 1-1/4"	100A	17.52	0.063	Active	CSA, UL

Engineering Selection Recommendations

Primary Selection (Manufacturer Recommended): 0312002.HXP from Littelfuse Inc. is the manufacturer-recommended substitute. Both 0312002.MXP and 0312002.HXP are active products from the same manufacturer and series with identical electrical and mechanical specifications. This option provides continuity with the original design intent and maintains full compliance with all approval agencies (CE, CSA, KC, PSE, UL).

Secondary Selection (Direct Manufacturer Alternative): 3AG 2-R from Bel Fuse Inc. is an active product with full compliance across CE, CSA, cULus, and PSE certifications. This part meets all critical substitution parameters and provides an alternative from an established fuse manufacturer.

Tertiary Selection (Parametric Equivalent): AGC-2-R and BK/AGC-2-R from Eaton - Electronics Division are active products that meet all critical electrical and mechanical parameters. Both variants are identical in specification and represent the AGC series alternative. CSA and UL certifications are provided.

Not Recommended for New Designs: 0034.5131 from SCHURTER Inc. is marked as obsolete and should not be selected for new applications, despite meeting the core substitution criteria.

Frequently Asked Questions (FAQ)

Q: Can I substitute 0312002.MXP with 0312002.HXP? A: Yes. Both parts are from Littelfuse Inc., share identical electrical and mechanical specifications, and are both active products. This is the manufacturer-recommended substitute.

Q: What is the difference between the Littelfuse 312 series parts and the Bel Fuse 3AG series? A: Both meet identical current, voltage, response time, and package requirements. The primary difference is manufacturer. The 3AG 2-R has a higher breaking capacity (200A vs. 100A) and different melting I²t value (7.2 vs. 5.2), but these secondary parameters do not affect substitution eligibility when the core electrical and mechanical specifications match.

Q: Can I use AGC-2-R or BK/AGC-2-R as a direct replacement? A: Yes. Both AGC variants meet all critical substitution parameters: 2 A current rating, 250 V AC voltage rating, fast-blow response, and 3AB/3AG package compatibility. The BK/AGC-2-R designation indicates a black body variant of the same AGC series fuse.

Q: Why is 0034.5131 listed if it is obsolete? A: The part is included in the substitute list because it meets all electrical and mechanical substitution criteria. However, its obsolete status makes it unsuitable for new designs or long-term supply chain planning.

Q: Are all these parts RoHS3 compliant? A: Yes. All listed substitute parts are ROHS3 compliant, matching the compliance status of the 0312002.MXP.

Q: What holder types are compatible with these fuses? A: All listed fuses are designed for 3AB and 3AG holder applications. The 0.250" diameter by 1.250" length (6.35mm x 31.75mm) package is standard across all substitutes, ensuring mechanical compatibility with existing holder installations.

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