Equivalent & Substitute Parts for GMC-4-R Glass Cartridge Fuse

Part Overview

The GMC-4-R is a 4 A, 125 V AC/DC glass cartridge fuse manufactured by Eaton - Electronics Division. This medium-blow fuse is designed for applications requiring a 5mm x 20mm form factor and operates with a breaking capacity of 10 kA at rated voltage. The part is currently active in production with 929 pieces in stock. Identifying equivalent and substitute parts is necessary to ensure supply chain continuity, optimize inventory management, and maintain circuit protection performance across equivalent electrical specifications.

Substiute Parts

GMC-4-R

Eaton - Electronics DivisionIn Stock: 951GMC-4-R Datasheet

Current PartRFQ

BK/GMC-4-R

Eaton - Electronics DivisionIn Stock: 1019BK/GMC-4-R Datasheet

DirectRFQ

BK1/GMC-4-R

Eaton - Electronics DivisionIn Stock: 766BK1/GMC-4-R Datasheet

Parametric EquivalentRFQ

0239004.HXP

Littelfuse Inc.In Stock: 68920239004.HXP Datasheet

SimilarRFQ

0233004.MXP

Littelfuse Inc.In Stock: 51190233004.MXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the GMC-4-R is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

• Current Rating: 4 A (exact match required)
• Voltage Rating: 125 V AC (exact match required)
• Package / Case: 5mm x 20mm (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Breaking Capacity: 10 kA (exact match required)

Secondary Compatibility Factors:

• Response Time: Medium Blow preferred for direct equivalence
• Mounting Type: Requires Holder (consistent across all parts)
• Regulatory Compliance: CSA, KC, MITI, UL certifications

Substitute parts are grouped into two categories:

Direct Manufacturer Equivalents (Eaton - Electronics Division): BK/GMC-4-R and BK1/GMC-4-R maintain identical electrical specifications and response characteristics to the main part GMC-4-R.

Parametric Equivalents (Cross-Manufacturer): 0233004.MXP (Littelfuse Inc., Series 233) matches all critical electrical parameters with medium-blow response. The part 0239004.HXP (Littelfuse Inc., Series 239) is classified as a similar part due to slow-blow response time, which differs from the medium-blow specification of the main part.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitution (Preferred):

BK/GMC-4-R and BK1/GMC-4-R are direct substitutes for GMC-4-R. Both parts are manufactured by Eaton - Electronics Division and maintain identical electrical specifications, response characteristics, and mechanical form factors. BK/GMC-4-R carries the same regulatory certifications (CSA, KC-MARK, MITI, UL) as the main part. BK1/GMC-4-R carries CSA, KC, MITI, and UL certifications, with KC-MARK certification not listed. Both parts are active in production status.

Cross-Manufacturer Substitution:

0233004.MXP (Littelfuse Inc., Series 233) is a parametric equivalent suitable for applications where cross-manufacturer sourcing is acceptable. This part matches all critical electrical parameters: 4 A current rating, 125 V AC voltage rating, 5mm x 20mm package, medium-blow response, and 10 kA breaking capacity. The part carries CE, CSA, KC, PSE, and UL certifications and specifies an operating temperature range of -55°C to 125°C. Melting I²t (51.61) and DC cold resistance (0.0293 Ohms) differ from the main part but remain within acceptable parametric equivalence for medium-blow fuses.

Limited Substitution (Application-Dependent):

0239004.HXP (Littelfuse Inc., Series 239) is classified as a similar part due to slow-blow response time, which differs from the medium-blow specification of GMC-4-R. This part is suitable only for applications where slow-blow characteristics are acceptable or required. The significantly higher melting I²t value (270.703) indicates extended response time, making this part unsuitable for circuits designed for medium-blow protection. This part carries CE, CSA, KC, PSE, and UL certifications.

Frequently Asked Questions (FAQ)

Q: Can BK/GMC-4-R be used as a direct replacement for GMC-4-R?

A: Yes. BK/GMC-4-R is a direct manufacturer equivalent produced by Eaton - Electronics Division with identical electrical specifications, response time (medium blow), package dimensions (5mm x 20mm), and regulatory certifications (CSA, KC-MARK, MITI, UL).

Q: What is the difference between BK/GMC-4-R and BK1/GMC-4-R?

A: Both parts are Eaton - Electronics Division medium-blow fuses with identical electrical specifications and 5mm x 20mm package dimensions. The primary difference is regulatory certification: BK/GMC-4-R includes KC-MARK certification, while BK1/GMC-4-R does not list KC-MARK certification. Selection depends on regional compliance requirements.

Q: Can 0233004.MXP replace GMC-4-R in all applications?

A: 0233004.MXP is a parametric equivalent from Littelfuse Inc. that matches all critical electrical parameters and response time (medium blow). Cross-manufacturer substitution is acceptable where supply chain flexibility is required. Verify that the application does not depend on specific Eaton manufacturing characteristics or certifications beyond the standard CSA, KC, and UL requirements.

Q: Why is 0239004.HXP listed as a similar part rather than a direct substitute?

A: 0239004.HXP has a slow-blow response time, whereas GMC-4-R is specified as medium-blow. The melting I²t value of 270.703 for the slow-blow part is significantly higher than the 36 value for the medium-blow part, indicating different circuit protection characteristics. Use 0239004.HXP only in applications where slow-blow protection is required.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All parts listed—GMC-4-R, BK/GMC-4-R, BK1/GMC-4-R, 0233004.MXP, and 0239004.HXP—are ROHS3 compliant.

Q: What is the significance of the melting I²t parameter in fuse selection?

A: Melting I²t determines the thermal energy required to melt the fuse element and is directly related to response time. Lower I²t values (such as 36 for GMC-4-R) indicate faster response times (medium blow). Higher I²t values (such as 270.703 for 0239004.HXP) indicate slower response times (slow blow). Substitution requires matching I²t characteristics to maintain consistent circuit protection behavior.

Q: Do all substitute parts support the same voltage and current ratings?

A: Yes. All substitute parts are rated for 4 A at 125 V AC, matching the main part GMC-4-R. All parts also maintain the same 10 kA breaking capacity at rated voltage.

Q: What certifications are required for my application?

A: Certification requirements depend on regional and industry standards. GMC-4-R carries CSA, KC-MARK, MITI, and UL certifications. BK/GMC-4-R carries the same certifications. BK1/GMC-4-R carries CSA, KC, MITI, and UL certifications (without KC-MARK). Littelfuse parts (0233004.MXP and 0239004.HXP) carry CE, CSA, KC, PSE, and UL certifications. Verify that substitute parts meet all required certifications for your specific application and region.