Littelfuse 0313.400HXP Glass Cartridge Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0313.400HXP is a 400 mA, 250 V AC/DC slow-blow glass cartridge fuse in 3AB/3AG package format (1/4" x 1-1/4"). This component is classified as Active and remains in production. Glass cartridge fuses of this specification are used in circuit protection applications requiring slow-blow response characteristics and are designed for use with standard fuse holders rated for 3AB or 3AG packages.

Substitute parts become necessary when primary inventory is unavailable, when sourcing from alternative manufacturers is required for supply chain optimization, or when design flexibility permits equivalent electrical and mechanical parameters.

Substiute Parts

0313.400HXP

Littelfuse Inc.In Stock: 9940313.400HXP Datasheet

Current PartRFQ

0313.400MXP

Littelfuse Inc.In Stock: 24190313.400MXP Datasheet

DirectRFQ

0034.5218

SCHURTER Inc.In Stock: 12300034.5218 Datasheet

MFR RecommendedRFQ

0034.3413

SCHURTER Inc.In Stock: 11420034.3413 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 0313.400HXP is determined by strict equivalence across the following critical parameters:

• Current Rating: 400 mA (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" (exact match required)
• Physical Dimensions: 0.250" Dia x 1.250" L (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)

All substitute parts listed meet these electrical and mechanical requirements. Substitutes are grouped by manufacturer and product status to facilitate selection based on availability and compliance requirements.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (Active Status): The Littelfuse 0313.400MXP is the direct equivalent to the 0313.400HXP, manufactured by the same supplier and maintaining Active product status. Both parts are ROHS3 compliant and carry identical electrical and mechanical specifications. Selection between these two Littelfuse variants should be based on inventory availability and lead time requirements.

Alternative Selection (Obsolete Status): The SCHURTER Inc. parts 0034.5218 and 0034.3413 are parametric equivalents meeting all electrical and mechanical requirements. However, both are classified as Obsolete. These parts are suitable for substitution only when Active alternatives are unavailable and existing inventory can be confirmed. The 0034.5218 carries CE, CSA, and UL approvals; the 0034.3413 carries CE approval only.

Compliance Considerations: All listed substitutes maintain ROHS3 compliance and REACH Unaffected status. Approval agency certifications vary between manufacturers and should be verified against specific application requirements before final selection.

Frequently Asked Questions (FAQ)

Q: Can the 0313.400MXP be used as a direct replacement for the 0313.400HXP? A: Yes. Both parts are manufactured by Littelfuse Inc., share identical electrical ratings (400 mA, 250 V AC), response time (Slow Blow), package format (3AB, 3AG), physical dimensions (0.250" Dia x 1.250" L), and operating temperature range (-55°C ~ 125°C). Both are Active products with ROHS3 compliance.

Q: Are the SCHURTER parts (0034.5218 and 0034.3413) suitable for new designs? A: Both SCHURTER parts are classified as Obsolete. While they meet all electrical and mechanical parameters required for substitution, they are not recommended for new designs. These parts are suitable only for replacement or repair of existing equipment where inventory is available and supply continuity can be confirmed.

Q: What is the difference between the Littelfuse 0313.400HXP and 0313.400MXP? A: Both parts are electrically and mechanically identical. The primary difference is the internal construction designation (HXP vs. MXP). Selection should be based on inventory availability and lead time.

Q: Can these fuses be used in any 3AB or 3AG fuse holder? A: Yes. All listed parts are designed for use with standard fuse holders rated for 3AB or 3AG package formats. Physical dimensions (0.250" Dia x 1.250" L) are identical across all substitutes, ensuring mechanical compatibility.

Q: What approval agencies certify these fuses? A: The Littelfuse 0313.400HXP and 0313.400MXP carry CE, CSA, and UL approvals. The SCHURTER 0034.5218 carries CE, CSA, and UL approvals. The SCHURTER 0034.3413 carries CE approval only. Verify approval requirements for your specific application before selection.

Q: Are there differences in melting I²t values between substitutes? A: The Littelfuse parts (0313.400HXP and 0313.400MXP) specify a melting I²t of 1.35. The SCHURTER 0034.3413 specifies 0.3. The SCHURTER 0034.5218 does not provide this specification. These differences do not affect substitution eligibility based on the provided parameters but may be relevant for detailed thermal analysis in specific applications.