Littelfuse 023306.3M Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 023306.3M is a 6.3 A, 125 V AC/DC glass cartridge fuse with a 5mm x 20mm form factor, designed for applications requiring medium-blow response characteristics. This part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility. Substitute parts must match the core electrical parameters: 6.3 A current rating, 125 V AC voltage rating, medium-blow response, and 5mm x 20mm package dimensions.

Substiute Parts

023306.3M

Littelfuse Inc.In Stock: 787023306.3M Datasheet

Current PartRFQ

023206.3MX125P

Littelfuse Inc.In Stock: 867023206.3MX125P Datasheet

Parametric EquivalentRFQ

023306.3MXBP

LittelfuseIn Stock: 763023306.3MXBP Datasheet

Parametric EquivalentRFQ

023306.3MXF11P

Littelfuse Inc.In Stock: 1081023306.3MXF11P Datasheet

Parametric EquivalentRFQ

023306.3MXF5P

Littelfuse Inc.In Stock: 877023306.3MXF5P Datasheet

Parametric EquivalentRFQ

023306.3MXP

Littelfuse Inc.In Stock: 46282023306.3MXP Datasheet

Parametric EquivalentRFQ

BK/GMC-6.3-R

Eaton - Electronics DivisionIn Stock: 1809BK/GMC-6.3-R Datasheet

MFR RecommendedRFQ

BK1/GMC-6.3-R

Eaton - Electronics DivisionIn Stock: 639BK1/GMC-6.3-R Datasheet

MFR RecommendedRFQ

GMC-6.3-R

Eaton - Electronics DivisionIn Stock: 1146GMC-6.3-R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following parameters:

Primary Matching Criteria (Non-Negotiable):

• Current Rating: 6.3 A
• Voltage Rating (AC): 125 V
• Fuse Type: Cartridge, Glass
• Package / Case: 5mm x 20mm
• Response Time: Medium Blow
• Mounting Type: Requires Holder

Secondary Compatibility Factors:

• Operating Temperature Range: -55°C to 125°C
• Breaking Capacity @ Rated Voltage: 10 kA (preferred)

All substitute parts listed below satisfy the primary matching criteria. Variations in secondary parameters (melting I²t, DC cold resistance, RoHS compliance status, and approval agencies) do not affect functional substitutability within the specified electrical and mechanical constraints.

Parameter Comparison

Engineering Selection Recommendations

Littelfuse Series 233 Substitutes (Preferred for Direct Replacement):

The Littelfuse 023306.3MXP, 023306.3MXF5P, 023306.3MXF11P, and 023306.3MXBP are direct functional equivalents within the same manufacturer's product line. All maintain identical electrical specifications and 10 kA breaking capacity. These parts are active products with ROHS3 compliance and comprehensive approval certifications (CE, CSA, KC, PSE, UL), making them suitable for applications with modern regulatory requirements.

Littelfuse Series 232 Substitute (Alternative with Lower Breaking Capacity):

The 023206.3MX125P is an active Littelfuse product with matching electrical parameters but features a reduced breaking capacity of 0.3 kA compared to the original 10 kA specification. This part is suitable only for applications where the lower breaking capacity is acceptable and does not compromise circuit protection requirements.

Eaton GMC Series Substitutes (Cross-Manufacturer Alternatives):

The Eaton GMC-6.3-R, BK/GMC-6.3-R, and BK1/GMC-6.3-R are active cross-manufacturer alternatives that maintain all primary electrical and mechanical parameters with 10 kA breaking capacity. These parts carry CSA, KC-MARK, MITI, and UL certifications and are ROHS3 compliant. Selection of Eaton alternatives is appropriate when supply chain considerations or existing Eaton component standardization favor cross-manufacturer sourcing.

Frequently Asked Questions (FAQ)

Q: Can 023306.3MXP be used as a direct replacement for 023306.3M?

A: Yes. The 023306.3MXP matches all primary electrical parameters (6.3 A, 125 V AC, medium-blow response, 5mm x 20mm package) and maintains the same 10 kA breaking capacity. The primary difference is product status (active vs. obsolete) and enhanced RoHS3 compliance.

Q: What is the difference between the Littelfuse Series 233 variants (023306.3MXP, 023306.3MXF5P, 023306.3MXF11P, 023306.3MXBP)?

A: These parts are functionally equivalent with identical electrical specifications and breaking capacity. Designations reflect different packaging or distribution channel configurations. All are suitable for direct substitution.

Q: Why does 023206.3MX125P have a lower breaking capacity (0.3 kA vs. 10 kA)?

A: The 023206.3MX125P belongs to the Series 232 product line, which has different internal construction characteristics. While it maintains the required 6.3 A and 125 V ratings, the reduced breaking capacity may limit its application to circuits with lower fault current levels. Verify circuit requirements before selection.

Q: Are Eaton GMC series fuses compatible with Littelfuse holders?

A: Eaton GMC-6.3-R, BK/GMC-6.3-R, and BK1/GMC-6.3-R maintain identical 5mm x 20mm physical dimensions and mounting requirements. Mechanical compatibility with existing Littelfuse holders is confirmed. Electrical performance is equivalent across all parameters.

Q: Which substitute part has the highest inventory availability?

A: The Littelfuse 023306.3MXP has the highest inventory level at 46,200 pieces, followed by 023306.3MXF11P at 1,060 pieces. Eaton GMC-6.3-R has 1,089 pieces available.

Q: What certifications apply to all substitute parts?

A: All substitute parts carry UL and CSA certifications. Littelfuse Series 233 parts additionally include CE, KC, and PSE certifications. Eaton GMC series includes KC-MARK and MITI certifications. Verify specific certification requirements for your application.