GMC-6.3A Glass Cartridge Fuse 6.3A 125VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The GMC-6.3A is a glass cartridge fuse manufactured by Eaton - Electronics Division, rated for 6.3 A at 125 V AC/DC with a 5mm x 20mm form factor. This fuse requires a holder for installation and operates with medium blow response characteristics. The part is active in production with 987 pieces currently in stock. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, and functional performance parameters to ensure direct interchangeability in circuit protection applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	GMC-6.3A
Manufacturer	Eaton - Electronics Division
Series	GMC
Current Rating	6.3 A
Voltage Rating - AC	125 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm
Response Time	Medium Blow
Mounting Type	Requires Holder
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the GMC-6.3A are grouped into two categories based on electrical and mechanical compatibility:

Category 1: Parametric Equivalents (Eaton GMC Series) Parts BK/GMC-6.3-R, BK1/GMC-6.3-R, and GMC-6.3-R are direct parametric equivalents manufactured by Eaton. These parts share identical electrical specifications: 6.3 A current rating, 125 V AC voltage rating, medium blow response, and 5mm x 20mm package dimensions. All three parts are rated for 10kA breaking capacity at rated voltage with a melting I²t of 110. These parts differ only in packaging designation and inventory availability but maintain full functional equivalence.

Category 2: Parametric Equivalents (Littelfuse 233 Series) Parts 023306.3MXF5P, 023306.3MXF11P, 023306.3MXBP, and 023306.3MXP are manufactured by Littelfuse and meet the same electrical and mechanical requirements: 6.3 A current rating, 125 V AC voltage rating, medium blow response, and 5mm x 20mm package dimensions. These parts are rated for 10kA breaking capacity at rated voltage. The primary differences are in melting I²t values (151.905 versus 110), operating temperature range (-55°C to 125°C), and approval agency certifications (CE, CSA, KC, PSE, UL).

Category 3: Parametric Equivalent (Littelfuse 232 Series) Part 023206.3MX125P is a Littelfuse equivalent with matching 6.3 A and 125 V AC ratings and 5mm x 20mm dimensions. This part has a lower breaking capacity (300A) and lower melting I²t (90.415) compared to other substitutes, with operating temperature range of -55°C to 125°C.

Substitution is valid when the replacement part maintains the same current rating, voltage rating, package dimensions, and response time classification.

Parameter Comparison

Part Number	Manufacturer	Current Rating (A)	Voltage Rating - AC (V)	Response Time	Package (mm)	Breaking Capacity @ Rated Voltage	Melting I²t	DC Cold Resistance (Ohms)	Inventory (Pcs)
GMC-6.3A	Eaton	6.3	125	Medium Blow	5 x 20	10kA	110	0.012	987
BK/GMC-6.3-R	Eaton	6.3	125	Medium Blow	5 x 20	10kA	110	0.012	1742
BK1/GMC-6.3-R	Eaton	6.3	125	Medium Blow	5 x 20	10kA	110	0.012	606
GMC-6.3-R	Eaton	6.3	125	Medium Blow	5 x 20	10kA	110	0.012	1089
023206.3MX125P	Littelfuse	6.3	125	Medium Blow	5 x 20	300A	90.415	0.0102	768
023306.3MXBP	Littelfuse	6.3	125	Medium Blow	5 x 20	10kA	151.905	0.0166	731
023306.3MXF11P	Littelfuse	6.3	125	Medium Blow	5 x 20	10kA	151.905	0.0166	1060
023306.3MXF5P	Littelfuse	6.3	125	Medium Blow	5 x 20	10kA	151.905	0.0166	854
023306.3MXP	Littelfuse	6.3	125	Medium Blow	5 x 20	10kA	151.905	0.0166	46200

Engineering Selection Recommendations

Eaton GMC Series Substitutes (BK/GMC-6.3-R, BK1/GMC-6.3-R, GMC-6.3-R)

These parts provide direct substitution with identical electrical and mechanical specifications. All three variants are approved by CSA, KC-MARK, MITI, and UL. Selection among these three Eaton variants depends on packaging designation and inventory availability. BK/GMC-6.3-R offers the highest inventory level at 1742 pieces. All three maintain ROHS3 compliance and are rated for 10kA breaking capacity.

Littelfuse 233 Series Substitutes (023306.3MXF5P, 023306.3MXF11P, 023306.3MXBP, 023306.3MXP)

These parts meet all electrical and mechanical requirements with 10kA breaking capacity matching the GMC-6.3A. The 233 series variants feature higher melting I²t values (151.905) and extended operating temperature range (-55°C to 125°C). All four variants carry CE, CSA, KC, PSE, and UL approvals. Part 023306.3MXP has the largest inventory at 46200 pieces and is recommended for high-volume applications. All 233 series parts maintain ROHS3 compliance and REACH Unaffected status.

Littelfuse 232 Series Substitute (023206.3MX125P)

This part meets electrical and mechanical requirements but features lower breaking capacity (300A) and lower melting I²t (90.415). It carries CE, KC, and PSE approvals. Operating temperature range is -55°C to 125°C. This variant is suitable for applications where the lower breaking capacity is acceptable within circuit design parameters.

Frequently Asked Questions (FAQ)

Q: Can I substitute GMC-6.3A with any of the listed Littelfuse parts?

A: Yes. All Littelfuse parts listed (023206.3MX125P, 023306.3MXBP, 023306.3MXF11P, 023306.3MXF5P, 023306.3MXP) share the same current rating (6.3 A), voltage rating (125 V AC), response time (medium blow), and package dimensions (5mm x 20mm). Differences in breaking capacity and melting I²t do not prevent substitution but should be evaluated against specific circuit protection requirements.

Q: What is the difference between the Eaton GMC variants (BK/GMC-6.3-R, BK1/GMC-6.3-R, GMC-6.3-R)?

A: These three Eaton parts are electrically and mechanically identical with matching 6.3 A, 125 V AC ratings, 10kA breaking capacity, and 5mm x 20mm dimensions. The designations (BK, BK1, standard) represent packaging or distribution variants. Selection should be based on inventory availability and packaging requirements for your application.

Q: Are there approval agency differences between Eaton and Littelfuse substitutes?

A: Yes. Eaton GMC variants carry CSA, KC-MARK, MITI, and UL approvals. Littelfuse 233 series parts carry CE, CSA, KC, PSE, and UL approvals. Littelfuse 232 series carries CE, KC, and PSE approvals. Verify that the substitute part's approval agencies meet your regional and application-specific compliance requirements.

Q: What does melting I²t indicate and why does it differ between substitutes?

A: Melting I²t is a thermal characteristic indicating the fuse element's energy absorption capacity before melting. Eaton GMC parts have melting I²t of 110, while Littelfuse 233 series has 151.905, and 232 series has 90.415. Higher values indicate greater thermal capacity. All values are within acceptable ranges for 6.3 A medium blow fuses and do not prevent substitution.

Q: Can I use 023306.3MXP as a direct replacement for GMC-6.3A?

A: Yes. Part 023306.3MXP meets all electrical specifications (6.3 A, 125 V AC, medium blow, 5mm x 20mm) and is rated for 10kA breaking capacity. It carries comprehensive approvals (CE, CSA, KC, PSE, UL) and has the highest inventory availability (46200 pieces) among all substitutes.

Q: Do all substitute parts require the same holder as GMC-6.3A?

A: Yes. All substitute parts are glass cartridge fuses with 5mm x 20mm dimensions and require a compatible fuse holder. The mechanical form factor is identical across all listed substitutes.

Q: What is the operating temperature range for substitute parts?

A: Eaton GMC variants do not specify an operating temperature range in the provided data. Littelfuse parts (both 232 and 233 series) operate from -55°C to 125°C. Verify temperature requirements for your specific application environment.

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