Equivalent & Substitute Parts for BK1/GMC-4-R

Part Overview

The BK1/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 5mm x 20mm holder applications and requires a compatible fuse holder for installation. The part is currently active in production with 662 pieces in stock. Alternative equivalent parts are necessary to support supply chain flexibility, extended lead times, or regional availability requirements while maintaining identical electrical and mechanical performance characteristics.

Substiute Parts

BK1/GMC-4-R

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

Current PartRFQ

BK/GMC-4-R

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

Parametric EquivalentRFQ

0233004.MXP

Littelfuse Inc.In Stock: 51190233004.MXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the BK1/GMC-4-R is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

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

Both identified substitute parts (BK/GMC-4-R and 0233004.MXP) meet all mandatory matching criteria. Variations in secondary parameters such as DC cold resistance, melting I²t, approval agencies, and operating temperature ranges do not disqualify substitution when primary electrical and mechanical specifications are identical.

Parameter Comparison

Engineering Selection Recommendations

BK/GMC-4-R (Eaton - Electronics Division): This substitute maintains identical electrical characteristics and mechanical dimensions to the BK1/GMC-4-R. Both parts are manufactured by Eaton and share the same GMC series designation. The BK/GMC-4-R carries equivalent regulatory approvals (CSA, KC-MARK, MITI, UL) and ROHS3 compliance. Selection of this part is appropriate when Eaton supply chain continuity is required or when inventory availability of the primary part is constrained. Current inventory of 940 pieces supports immediate availability.

0233004.MXP (Littelfuse Inc.): This substitute meets all mandatory electrical and mechanical parameters for direct replacement. The Littelfuse 233 series fuse provides equivalent 4 A, 125 V AC/DC performance in the 5mm x 20mm package with 10 kA breaking capacity and medium-blow response. Regulatory approvals include CE, CSA, KC, PSE, and UL certifications, providing broader regional compliance coverage. The operating temperature range of -55°C to 125°C extends environmental capability. Inventory availability of 5100 pieces ensures supply continuity. The variation in melting I²t (51.61 versus 36) and DC cold resistance (0.0293 Ohms versus 0.019 Ohms) reflects manufacturer-specific design characteristics within the same functional class and does not affect substitution validity for standard 4 A, 125 V applications.

Frequently Asked Questions (FAQ)

Q: Can BK/GMC-4-R be used as a direct replacement for BK1/GMC-4-R? A: Yes. Both parts are manufactured by Eaton, share identical current rating (4 A), voltage rating (125 V AC), fuse type (cartridge glass), package dimensions (5mm x 20mm), response time (medium blow), and breaking capacity (10 kA). The parts are mechanically and electrically interchangeable.

Q: Can 0233004.MXP from Littelfuse be used as a direct replacement for BK1/GMC-4-R? A: Yes. The 0233004.MXP meets all mandatory electrical and mechanical specifications: 4 A current rating, 125 V AC voltage rating, cartridge glass fuse type, 5mm x 20mm package, medium-blow response, and 10 kA breaking capacity. The part is suitable for direct substitution in applications requiring these specifications.

Q: What are the key parameters that determine substitution compatibility? A: Substitution compatibility is determined by matching: current rating (4 A), AC voltage rating (125 V), fuse type (cartridge glass), package dimensions (5mm x 20mm), response time (medium blow), breaking capacity (10 kA), and mounting requirement (requires holder). All three parts meet these criteria.

Q: Does the difference in melting I²t between parts affect substitution? A: The melting I²t values (36 for Eaton parts, 51.61 for Littelfuse) reflect manufacturer-specific thermal characteristics within the same functional fuse class. Both values are valid for 4 A, 125 V medium-blow cartridge fuses and do not prevent substitution for standard circuit protection applications.

Q: Does the difference in DC cold resistance affect substitution? A: DC cold resistance variations (0.019 Ohms for Eaton, 0.0293 Ohms for Littelfuse) are within acceptable tolerances for cartridge fuse design and do not affect substitution validity for standard 4 A, 125 V AC applications.

Q: Are all three parts RoHS compliant? A: Yes. BK1/GMC-4-R, BK/GMC-4-R, and 0233004.MXP are all ROHS3 compliant.

Q: What regulatory approvals do these parts carry? A: BK1/GMC-4-R and BK/GMC-4-R carry CSA, KC, MITI, and UL approvals. 0233004.MXP carries CE, CSA, KC, PSE, and UL approvals. All parts meet major regional regulatory requirements.

Q: Which part has the best inventory availability? A: 0233004.MXP (Littelfuse) has the highest inventory with 5100 pieces in stock, followed by BK/GMC-4-R (Eaton) with 940 pieces, and BK1/GMC-4-R with 662 pieces.