Littelfuse 023406.3M Ceramic Fuse 6.3A 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 023406.3M is a ceramic cartridge fuse rated at 6.3A, 250VAC, with a 5x20mm form factor and medium blow response time. This part is classified as obsolete, making identification of active equivalent alternatives essential for ongoing system maintenance and new design implementations. Substitute parts must maintain identical electrical ratings and mechanical dimensions to ensure direct compatibility in existing fuse holder assemblies.

Substiute Parts

023406.3M

Littelfuse Inc.In Stock: 898023406.3M Datasheet

Current PartRFQ

023406.3MXBP

LittelfuseIn Stock: 1145023406.3MXBP Datasheet

Parametric EquivalentRFQ

023406.3MXP

Littelfuse Inc.In Stock: 1931023406.3MXP Datasheet

Parametric EquivalentRFQ

0034.2524

SCHURTER Inc.In Stock: 18670034.2524 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following mandatory parameters:

• Current Rating: 6.3 A (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Package / Case: 5mm x 20mm (exact match required)
• Fuse Type: Cartridge, Ceramic (exact match required)
• Response Time: Medium Blow (exact match required)
• Mounting Type: Requires Holder (exact match required)

All three substitute parts meet these core electrical and mechanical requirements. Secondary parameters such as DC voltage rating, melting I²t, DC cold resistance, and operating temperature range vary between manufacturers but do not affect primary substitution eligibility for AC-rated applications.

Parameter Comparison

Engineering Selection Recommendations

For direct replacement of the obsolete 023406.3M, the Littelfuse 023406.3MXBP and 023406.3MXP are preferred substitutes. Both parts are active products with ROHS3 compliance and expanded approval certifications (CE, PSE) compared to the original part. These variants maintain identical electrical and mechanical specifications while offering improved regulatory compliance for modern applications.

The SCHURTER 0034.2524 is a parametric equivalent that meets all core substitution criteria. However, selection of this part should be based on specific application requirements, as it features a higher breaking capacity (1kA versus 200A) and different melting I²t characteristic (159 versus 37.685). The SCHURTER part is suitable for applications requiring enhanced fault current handling or where the FSM 5x20 series is already qualified in the design.

For new designs or systems requiring regulatory compliance with current standards, Littelfuse 023406.3MXBP or 023406.3MXP are the recommended selections due to active product status and comprehensive certification coverage.

Frequently Asked Questions (FAQ)

Q: Can the 023406.3MXBP and 023406.3MXP be used interchangeably with the 023406.3M?

A: Yes. Both parts are direct parametric equivalents with identical current rating (6.3A), AC voltage rating (250V), package dimensions (5x20mm), response time (medium blow), and fuse type (ceramic cartridge). The primary difference is product status and regulatory compliance; both substitutes are active products with ROHS3 certification.

Q: What is the difference between the Littelfuse and SCHURTER substitutes?

A: All three substitutes meet the core electrical and mechanical requirements. The Littelfuse variants (023406.3MXBP, 023406.3MXP) are direct replacements with matching breaking capacity (200A). The SCHURTER 0034.2524 offers higher breaking capacity (1kA) and different thermal characteristics (melting I²t of 159 versus 37.685). Selection depends on whether the application requires the enhanced fault current rating.

Q: Are there packaging differences between the substitutes?

A: The 023406.3M is supplied in standard packaging. The 023406.3MXBP is supplied in bulk packaging. The 023406.3MXP is supplied in bulk packaging. All three maintain identical 5x20mm form factor and are compatible with standard fuse holders designed for this dimension.

Q: Which substitute should be selected for new designs?

A: For new designs requiring current regulatory compliance, either Littelfuse 023406.3MXBP or 023406.3MXP is recommended. Both are active products with ROHS3 compliance and comprehensive international certifications (CE, CSA, K-MARK, PSE, UL). Selection between these two Littelfuse variants can be based on packaging requirements and inventory availability.

Q: Is the SCHURTER 0034.2524 suitable for direct replacement in existing assemblies?

A: The SCHURTER 0034.2524 is a parametric equivalent that meets all core substitution criteria and is mechanically compatible with existing 5x20mm fuse holders. However, the higher breaking capacity and different melting I²t may affect circuit protection characteristics. Verification against specific application requirements is necessary before implementation.