Equivalent & Substitute Parts for BK/GMC-5A Glass Cartridge Fuse

Part Overview

The BK/GMC-5A is a 5 A, 125 V AC/DC glass cartridge fuse manufactured by Eaton - Electronics Division. This fuse is classified as obsolete, with 868 pieces currently in stock. The GMC series fuse requires a holder for installation and is rated for medium blow response with a 10 kA breaking capacity at rated voltage. Due to its obsolete product status, equivalent and substitute parts from active product lines are necessary for ongoing system maintenance and new design implementations.

Key Parameters

Parameter	Value
Current Rating	5 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
Size / Dimension	0.205" Dia x 0.787" L (5.20mm x 20.00mm)

Substitute Part Grouping Explanation

Substitution for the BK/GMC-5A is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Current Rating: 5 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

All substitute parts listed below maintain identical values for these parameters, ensuring direct functional compatibility. Variations in secondary parameters such as melting I²t, DC cold resistance, and operating temperature range do not affect substitutability within the defined electrical and mechanical constraints.

Parameter Comparison

Part Number	Manufacturer	Current (A)	Voltage (V AC)	Fuse Type	Package	Response Time	Breaking Capacity (kA)	Product Status	RoHS Status	Inventory (Pcs)
BK/GMC-5A	Eaton - Electronics Division	5	125	Cartridge, Glass	5mm x 20mm	Medium Blow	10	Obsolete	RoHS non-compliant	868
BK/GMC-5-R	Eaton - Electronics Division	5	125	Cartridge, Glass	5mm x 20mm	Medium Blow	10	Active	ROHS3 Compliant	2290
BK1/GMC-5-R	Eaton - Electronics Division	5	125	Cartridge, Glass	5mm x 20mm	Medium Blow	10	Active	ROHS3 Compliant	1659
GMC-5-R	Eaton - Electronics Division	5	125	Cartridge, Glass	5mm x 20mm	Medium Blow	10	Active	ROHS3 Compliant	1046
0233005.MXBP	Littelfuse Inc.	5	125	Cartridge, Glass	5mm x 20mm	Medium Blow	10	Active	ROHS3 Compliant	690
0232005.MX125P	Littelfuse Inc.	5	125	Cartridge, Glass	5mm x 20mm	Medium Blow	10	Active	ROHS3 Compliant	1040
0233005.MXF11P	Littelfuse Inc.	5	125	Cartridge, Glass	5mm x 20mm	Medium Blow	10	Active	ROHS3 Compliant	791
0233005.MXF35P	Littelfuse Inc.	5	125	Cartridge, Glass	5mm x 20mm	Medium Blow	10	Active	ROHS3 Compliant	752
0233005.MXF36P	Littelfuse Inc.	5	125	Cartridge, Glass	5mm x 20mm	Medium Blow	10	Active	ROHS3 Compliant	1112
0233005.MXF5P	Littelfuse Inc.	5	125	Cartridge, Glass	5mm x 20mm	Medium Blow	10	Active	ROHS3 Compliant	715
0233005.MXP	Littelfuse	5	125	Cartridge, Glass	5mm x 20mm	Medium Blow	10	Active	ROHS3 Compliant	1866

Engineering Selection Recommendations

Eaton GMC Series (Direct Manufacturer Substitutes):

The BK/GMC-5-R, BK1/GMC-5-R, and GMC-5-R are direct substitutes from Eaton's active product line. All three maintain identical electrical and mechanical specifications to the obsolete BK/GMC-5A. These parts carry ROHS3 compliance, addressing regulatory requirements not met by the original part. The BK/GMC-5-R offers the highest inventory availability (2290 pieces), followed by BK1/GMC-5-R (1659 pieces) and GMC-5-R (1046 pieces). Selection among these three should be based on internal part numbering conventions and supply chain preferences.

Littelfuse 233 and 232 Series (Cross-Manufacturer Substitutes):

The Littelfuse 0233005.MXP, 0233005.MXF5P, 0233005.MXF11P, 0233005.MXF35P, 0233005.MXF36P, and 0233005.MXBP are functionally equivalent alternatives from an active product line. These parts meet all mandatory electrical and mechanical parameters. The 0233005.MXP variant provides the highest inventory level (1866 pieces) among Littelfuse options. All Littelfuse substitutes carry ROHS3 compliance and broader approval certifications including CE, CSA, KC, PSE, and UL.

The Littelfuse 0232005.MX125P from the 232 series is also electrically and mechanically equivalent, with 1040 pieces in inventory.

Compliance Considerations:

All substitute parts are ROHS3 compliant, addressing environmental and regulatory requirements. The original BK/GMC-5A is RoHS non-compliant. For applications requiring RoHS compliance, any of the listed substitutes are suitable. Approval agencies vary slightly between manufacturers; Eaton parts carry CSA, KC-MARK, MITI, and UL certifications, while Littelfuse parts carry CE, CSA, KC, PSE, and UL certifications.

Frequently Asked Questions (FAQ)

Q: Can I use BK/GMC-5-R as a direct replacement for BK/GMC-5A?

A: Yes. The BK/GMC-5-R is a direct substitute from Eaton's active product line. It maintains identical current rating (5 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 primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant).

Q: What is the difference between BK/GMC-5-R, BK1/GMC-5-R, and GMC-5-R?

A: All three are Eaton GMC series fuses with identical electrical and mechanical specifications. The differences are in part numbering conventions and inventory levels. BK/GMC-5-R has 2290 pieces available, BK1/GMC-5-R has 1659 pieces, and GMC-5-R has 1046 pieces. Selection should follow your organization's part numbering standards.

Q: Can I substitute an Eaton fuse with a Littelfuse fuse?

A: Yes. Littelfuse 0233005.MXP, 0233005.MXF5P, 0233005.MXF11P, 0233005.MXF35P, 0233005.MXF36P, 0233005.MXBP, and 0232005.MX125P all meet the mandatory electrical and mechanical parameters. Cross-manufacturer substitution is valid when all critical parameters match.

Q: Are there any differences in operating temperature range between substitutes?

A: The original BK/GMC-5A does not specify an operating temperature range. Littelfuse substitutes specify -55°C to 125°C. Eaton substitutes do not specify an operating temperature range. For applications with temperature constraints, the Littelfuse specified range provides documented performance data.

Q: Do all substitutes require the same holder?

A: Yes. All substitute parts maintain the 5mm x 20mm package dimension and cartridge, glass fuse type with holder requirement. Existing fuse holders compatible with BK/GMC-5A are compatible with all listed substitutes.

Q: Which substitute has the best inventory availability?

A: The BK/GMC-5-R from Eaton has the highest inventory with 2290 pieces in stock, followed by 0233005.MXP from Littelfuse with 1866 pieces.

Q: Are all substitutes RoHS compliant?

A: Yes. All substitute parts listed are ROHS3 compliant. The original BK/GMC-5A is RoHS non-compliant. For new designs or applications requiring RoHS compliance, any substitute is suitable.

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