BK/GMC-3.5A Equivalent & Substitute Parts

Part Overview

The BK/GMC-3.5A is a 3.5 A 125 V AC DC glass cartridge fuse manufactured by Eaton - Electronics Division, designed for 5mm x 20mm holder applications. This part operates with medium blow response time and carries multiple international approvals including CSA, KC-MARK, MITI, and UL certifications. The product is classified as obsolete, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for seamless circuit protection replacement.

Substiute Parts

BK/GMC-3.5A

Eaton - Electronics DivisionIn Stock: 1091BK/GMC-3.5A Datasheet

Current PartRFQ

BK/GMC-3.5-R

Eaton - Electronics DivisionIn Stock: 2625BK/GMC-3.5-R Datasheet

DirectRFQ

BK1/GMC-3.5-R

Eaton - Electronics DivisionIn Stock: 1927BK1/GMC-3.5-R Datasheet

Parametric EquivalentRFQ

GMC-3.5-R

Eaton - Electronics DivisionIn Stock: 918GMC-3.5-R Datasheet

Parametric EquivalentRFQ

023303.5MXBP

Littelfuse Inc.In Stock: 963023303.5MXBP Datasheet

SimilarRFQ

023303.5MXP

Littelfuse Inc.In Stock: 1015023303.5MXP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the BK/GMC-3.5A are classified into two categories based on parametric equivalence:

Direct Manufacturer Equivalents (Eaton - Electronics Division): BK/GMC-3.5-R, BK1/GMC-3.5-R, and GMC-3.5-R are active production alternatives from the same manufacturer. These parts maintain identical electrical specifications: 3.5 A current rating, 125 V AC voltage rating, 10kA breaking capacity, 25 melting I²t, and 0.022 Ohms DC cold resistance. All three share the same 5mm x 20mm glass cartridge form factor with medium blow response time. The primary distinction is product status transition from obsolete to active, with improved RoHS3 compliance in the active variants.

Cross-Manufacturer Equivalents (Littelfuse Inc.): 023303.5MXP and 023303.5MXBP from Littelfuse Inc. Series 233 provide parametric equivalence across all critical electrical and mechanical dimensions: 3.5 A current rating, 125 V AC voltage rating, 10kA breaking capacity, and 5mm x 20mm package geometry. These parts differ in melting I²t (36.275 versus 25), DC cold resistance (0.0322 Ohms versus 0.022 Ohms), and operating temperature range (-55°C ~ 125°C versus unspecified). Both Littelfuse alternatives carry expanded approval certifications including CE and PSE.

Substitution validity is determined by matching current rating, voltage rating, package dimensions, breaking capacity, and response time classification. All listed alternatives satisfy these core criteria.

Parameter Comparison

Engineering Selection Recommendations

Eaton Direct Replacements (BK/GMC-3.5-R, BK1/GMC-3.5-R, GMC-3.5-R):

These three variants represent the primary substitution path for the obsolete BK/GMC-3.5A. All three maintain exact electrical and mechanical parity with the original part, including identical melting I²t (25) and DC cold resistance (0.022 Ohms). The transition from obsolete to active status ensures continued manufacturing support and supply chain availability. All three carry CSA, KC-MARK, MITI, and UL certifications matching the original approval profile. Selection among these three Eaton variants depends on packaging preference (all available in bulk) and inventory availability: BK/GMC-3.5-R (2544 units), BK1/GMC-3.5-R (1905 units), and GMC-3.5-R (837 units).

Littelfuse Cross-Manufacturer Alternatives (023303.5MXP, 023303.5MXBP):

These Littelfuse Series 233 fuses provide functional equivalence with measurable parameter variations. The melting I²t differential (36.275 versus 25) and DC cold resistance increase (0.0322 versus 0.022 Ohms) represent thermal and electrical characteristic changes that may affect circuit protection timing in applications with tight tolerance requirements. Both Littelfuse alternatives include operating temperature specification (-55°C ~ 125°C) and expanded certifications (CE, CSA, KC, PSE, UL). Selection of Littelfuse alternatives is appropriate when supply constraints on Eaton variants exist or when the expanded operating temperature range and additional certifications align with system requirements.

Frequently Asked Questions (FAQ)

Q: Can BK/GMC-3.5-R, BK1/GMC-3.5-R, and GMC-3.5-R be used interchangeably with BK/GMC-3.5A?

A: Yes. All three Eaton variants maintain identical current rating (3.5 A), voltage rating (125 V AC), package dimensions (5mm x 20mm), breaking capacity (10kA), response time (medium blow), melting I²t (25), and DC cold resistance (0.022 Ohms). The primary difference is product status transition from obsolete to active production.

Q: What are the key differences between Eaton and Littelfuse substitute options?

A: Eaton variants (BK/GMC-3.5-R, BK1/GMC-3.5-R, GMC-3.5-R) provide exact electrical parameter matching with melting I²t of 25 and DC cold resistance of 0.022 Ohms. Littelfuse alternatives (023303.5MXP, 023303.5MXBP) feature higher melting I²t (36.275) and increased DC cold resistance (0.0322 Ohms), with specified operating temperature range (-55°C ~ 125°C). Both manufacturers meet the 3.5 A, 125 V, 10kA, 5mm x 20mm core specifications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All active substitute parts listed (BK/GMC-3.5-R, BK1/GMC-3.5-R, GMC-3.5-R, 023303.5MXP, 023303.5MXBP) carry ROHS3 compliance status. The original BK/GMC-3.5A is RoHS non-compliant.

Q: Which substitute part has the highest inventory availability?

A: BK/GMC-3.5-R from Eaton has the highest inventory with 2544 units in stock, followed by BK1/GMC-3.5-R (1905 units), 023303.5MXP from Littelfuse (973 units), 023303.5MXBP from Littelfuse (912 units), and GMC-3.5-R (837 units).

Q: Do all substitute parts fit the same 5mm x 20mm holder?

A: Yes. All substitute parts maintain the 5mm x 20mm package geometry and require the same holder type as the original BK/GMC-3.5A.

Q: What certifications do the substitute parts carry?

A: Eaton variants carry CSA, KC-MARK, MITI, and UL certifications. Littelfuse variants carry CE, CSA, KC, PSE, and UL certifications. All meet the approval requirements of the original part.