GMC-4A Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The GMC-4A is a 4 A, 125 V AC/DC glass cartridge fuse manufactured by Eaton - Electronics Division. This fuse is designed for use in 5mm x 20mm fuse holders and provides medium-blow response characteristics suitable for general-purpose circuit protection applications. The part is currently in active inventory status with 744 pieces available as new original stock.

Equivalent and substitute parts are necessary when the primary part number becomes unavailable, when alternative sourcing is required for supply chain optimization, or when design flexibility permits the use of functionally compatible alternatives from different manufacturers or product series.

Substiute Parts

GMC-4A

Eaton - Electronics DivisionIn Stock: 801GMC-4A Datasheet

Current PartRFQ

GMC-4-R

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

DirectRFQ

BK/GMC-4-R

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

Parametric EquivalentRFQ

BK1/GMC-4-R

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

Parametric EquivalentRFQ

0232004.MX125P

Littelfuse Inc.In Stock: 7550232004.MX125P Datasheet

Parametric EquivalentRFQ

0233004.MXBP

Littelfuse Inc.In Stock: 8430233004.MXBP Datasheet

Parametric EquivalentRFQ

0233004.MXF11P

Littelfuse Inc.In Stock: 11060233004.MXF11P Datasheet

Parametric EquivalentRFQ

0233004.MXF21P

Littelfuse Inc.In Stock: 9060233004.MXF21P Datasheet

Parametric EquivalentRFQ

0233004.MXP

Littelfuse Inc.In Stock: 51190233004.MXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the GMC-4A is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

• Current Rating: 4 A (exact match required)
• Voltage Rating - AC: 125 V (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Package / Case: 5mm x 20mm (exact match required)
• Response Time: Medium Blow (exact match required)
• Breaking Capacity @ Rated Voltage: 10 kA (exact match required)
• Mounting Type: Requires Holder (exact match required)

All substitute parts listed below meet these seven critical parameters without exception. Substitutes are grouped by manufacturer: Eaton - Electronics Division variants (GMC-4-R, BK/GMC-4-R, BK1/GMC-4-R) and Littelfuse Inc. variants (0232004.MX125P, 0233004.MXBP, 0233004.MXF11P, 0233004.MXF21P, 0233004.MXP).

Parameter Comparison

Engineering Selection Recommendations

Eaton - Electronics Division Variants (GMC-4-R, BK/GMC-4-R, BK1/GMC-4-R):

These three part numbers are direct equivalents to the GMC-4A with identical electrical and mechanical specifications. All three variants maintain the same melting I²t value of 36 and DC cold resistance of 0.019 Ohms. Selection among these variants depends on packaging designation and internal product line management by Eaton. All three carry active product status and hold certifications from CSA, KC-MARK, MITI, and UL (BK1/GMC-4-R holds KC instead of KC-MARK). These parts are suitable for direct substitution without circuit redesign.

Littelfuse Inc. Variants (0232004.MX125P, 0233004.MXBP, 0233004.MXF11P, 0233004.MXF21P, 0233004.MXP):

All Littelfuse variants meet the seven critical substitution parameters and carry active product status. These parts differ from the Eaton variants in melting I²t and DC cold resistance characteristics:

• 0232004.MX125P (Series 232): Melting I²t of 37.73 and DC cold resistance of 0.0174 Ohms. Holds CE, KC, and PSE certifications. Operating temperature range: -55°C to 125°C.

• 0233004.MXBP, 0233004.MXF11P, 0233004.MXF21P, 0233004.MXP (Series 233): All share melting I²t of 51.61 and DC cold resistance of 0.0293 Ohms. All hold CE, CSA, KC, PSE, and UL certifications. Operating temperature range: -55°C to 125°C. The 0233004.MXP variant has the highest inventory availability at 5100 pieces.

All substitute parts are ROHS3 compliant and REACH unaffected. Selection should be based on certification requirements for the target application and inventory availability.

Frequently Asked Questions (FAQ)

Q: Can GMC-4A be replaced with any of the listed substitute parts?

A: Yes. All listed substitute parts meet the seven critical substitution parameters: 4 A current rating, 125 V AC voltage rating, cartridge glass fuse type, 5mm x 20mm package, medium-blow response time, 10 kA breaking capacity, and holder-mount requirement. Direct substitution is electrically and mechanically compatible.

Q: What is the difference between Eaton GMC-4-R variants (GMC-4-R, BK/GMC-4-R, BK1/GMC-4-R)?

A: These three part numbers are functionally identical with matching melting I²t (36) and DC cold resistance (0.019 Ohms). The prefix designations (BK, BK1) represent internal product line variants within Eaton's GMC series. Selection among these three depends on packaging designation and supplier availability. All three are suitable for direct substitution.

Q: How do Littelfuse Series 232 and Series 233 fuses differ from the Eaton GMC-4A?

A: While all parts meet the critical substitution parameters, Littelfuse variants exhibit different thermal characteristics. Series 232 (0232004.MX125P) has a melting I²t of 37.73 and lower DC cold resistance (0.0174 Ohms). Series 233 variants have a higher melting I²t of 51.61 and higher DC cold resistance (0.0293 Ohms) compared to the Eaton GMC-4A (melting I²t 36, DC cold resistance 0.019 Ohms). These differences do not affect substitution eligibility but may influence thermal response in specific circuit applications.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance status and are REACH unaffected.

Q: Which substitute part has the highest inventory availability?

A: The Littelfuse 0233004.MXP (Series 233) has the highest inventory with 5100 pieces in stock, followed by 0233004.MXF11P with 1087 pieces.

Q: What certifications should I verify for my application?

A: Eaton GMC-4-R and BK/GMC-4-R hold CSA, KC-MARK, MITI, and UL certifications. BK1/GMC-4-R holds CSA, KC, MITI, and UL certifications. Littelfuse 0232004.MX125P holds CE, KC, and PSE certifications. Littelfuse Series 233 variants (0233004.MXBP, 0233004.MXF11P, 0233004.MXF21P, 0233004.MXP) hold CE, CSA, KC, PSE, and UL certifications. Select based on your target market and regulatory requirements.

Q: Can I use these fuses in any 5mm x 20mm fuse holder?

A: Yes. All substitute parts require a 5mm x 20mm fuse holder, which is the standard holder type for this fuse category. Mechanical compatibility is guaranteed across all listed parts.