Equivalent & Substitute Parts for BK/GMC-630MA Glass Cartridge Fuse

Part Overview

The BK/GMC-630MA is a 630 mA, 250 V AC/DC glass cartridge fuse manufactured by Eaton - Electronics Division. This fuse is designed for use in 5mm x 20mm holder applications and features medium blow response characteristics. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new design implementations. Substitute parts must maintain identical electrical ratings, mechanical dimensions, and holder compatibility to ensure proper circuit protection without modification to existing fuse holders.

Key Parameters

Parameter	Value	Criticality for Substitution
Current Rating	630 mA	Critical - Must match exactly
Voltage Rating (AC)	250 V	Critical - Must match or exceed
Package / Case	5mm x 20mm	Critical - Holder compatibility
Fuse Type	Cartridge, Glass	Critical - Form factor requirement
Response Time	Medium Blow	Critical - Circuit protection characteristic
Mounting Type	Requires Holder	Critical - Installation method
Breaking Capacity @ Rated Voltage	35 A (main part)	Important - Fault current handling
Melting I²t	0.66 (main part)	Important - Thermal response
DC Cold Resistance	0.246 Ohms	Important - Electrical performance
Approval Agency	CSA, KC-MARK, UL	Important - Regulatory compliance

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following parameters:

Critical Parameters (Must Match Exactly):

Current Rating: 630 mA
Voltage Rating (AC): 250 V minimum
Package / Case: 5mm x 20mm
Fuse Type: Cartridge, Glass
Response Time: Medium Blow
Mounting Type: Requires Holder

Important Parameters (Must Be Compatible):

Breaking Capacity: Equal to or greater than 35 A
Melting I²t: Within acceptable thermal response range
DC Cold Resistance: Consistent with electrical performance
Approval Agencies: Recognized certifications (UL, cULus, CSA, KC-MARK)

All substitute parts listed below satisfy these critical parameters. Variations in breaking capacity, melting I²t, and operating temperature ranges are acceptable provided the core electrical and mechanical specifications remain constant.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (mA)	Voltage AC (V)	Package	Response Time	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ω)	Product Status	RoHS Status
BK/GMC-630MA	Eaton	630	250	5x20mm	Medium Blow	35	0.66	0.246	Obsolete	Non-compliant
BK/GMC-630-R	Eaton	630	250	5x20mm	Medium Blow	35	0.66	0.246	Active	ROHS3 Compliant
BK1/GMC-630-R	Eaton	630	250	5x20mm	Medium Blow	35	0.66	0.246	Active	ROHS3 Compliant
GMC-630-R	Eaton	630	250	5x20mm	Medium Blow	35	0.66	0.246	Active	ROHS3 Compliant
20106300021	Littelfuse	630	250	5x20mm	Medium Blow	80	0.6	—	Active	ROHS3 Compliant
0034.2514	SCHURTER	630	250	5x20mm	Medium Blow	80	0.905	—	Active	ROHS3 Compliant
20106300001	Littelfuse	630	250	5x20mm	Medium Blow	80	0.6	—	Active	ROHS3 Compliant
20106300001P	Littelfuse	630	250	5x20mm	Medium Blow	80	0.6	—	Active	ROHS3 Compliant
20106300021P	Littelfuse	630	250	5x20mm	Medium Blow	80	0.6	—	Active	ROHS3 Compliant
MSC-630MA	OptiFuse	630	250	5x20mm	Medium Blow	100	0.688	—	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation - Eaton Direct Substitutes:

The BK/GMC-630-R, BK1/GMC-630-R, and GMC-630-R are direct electrical and mechanical equivalents manufactured by Eaton - Electronics Division. These parts maintain identical electrical parameters, breaking capacity, melting I²t, and DC cold resistance to the obsolete BK/GMC-630MA. All three variants are in active product status and ROHS3 compliant, making them the preferred choice for direct replacement in existing applications. Selection among these three Eaton variants depends on packaging requirements and inventory availability.

Secondary Recommendations - Cross-Manufacturer Substitutes:

Littelfuse 201 series fuses (20106300021, 20106300001, 20106300001P, 20106300021P) provide electrical equivalence with identical current rating, voltage rating, and package dimensions. These parts feature higher breaking capacity (80 A versus 35 A) and are cULus certified. The 201P series variants offer enhanced packaging options. All Littelfuse parts are ROHS3 compliant and in active production status.

Alternative Substitute - SCHURTER 0034.2514:

The SCHURTER FSM 5x20 series part 0034.2514 meets all critical electrical and mechanical parameters with 630 mA current rating and 250 V AC voltage rating. This part provides dual voltage rating capability (250 V AC / 125 V DC) and higher breaking capacity (80 A). Operating temperature range extends to -40°C to 85°C. ROHS3 compliant and in active production.

Alternative Substitute - OptiFuse MSC-630MA:

The OptiFuse MSC series part MSC-630MA provides electrical equivalence with 630 mA current rating and 250 V AC voltage rating. This part features the highest breaking capacity (100 A) and widest operating temperature range (-55°C to 125°C). cULus and UL 248 certified. ROHS3 compliant and in active production.

Product Status Consideration:

All substitute parts listed are in active production status, ensuring long-term availability and supply chain stability. The obsolete status of BK/GMC-630MA necessitates transition to one of these active alternatives for new designs and ongoing maintenance.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts directly in my existing fuse holder?

A: Yes. All substitute parts maintain the identical 5mm x 20mm package dimensions and cartridge glass form factor. No holder modification is required. Direct physical and electrical compatibility is guaranteed.

Q: What is the difference between the Eaton BK/GMC-630-R variants (BK/GMC-630-R, BK1/GMC-630-R, GMC-630-R)?

A: All three Eaton variants are electrically and mechanically identical with matching current rating (630 mA), voltage rating (250 V AC), breaking capacity (35 A), melting I²t (0.66), and DC cold resistance (0.246 Ω). Differences are limited to part number designation and packaging options. Selection should be based on inventory availability and internal part numbering requirements.

Q: Why do some substitute parts have higher breaking capacity (80 A or 100 A) than the original BK/GMC-630MA (35 A)?

A: Breaking capacity indicates the maximum fault current the fuse can safely interrupt. Higher breaking capacity provides enhanced safety margin in high-fault-current applications. All substitute parts maintain identical current rating (630 mA) and response time (medium blow), ensuring equivalent circuit protection. Higher breaking capacity does not affect normal operation and is acceptable for direct substitution.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed are ROHS3 compliant. The original BK/GMC-630MA is RoHS non-compliant. Transition to any substitute part ensures compliance with current environmental regulations.

Q: What certifications should I verify for my application?

A: The original BK/GMC-630MA carries CSA, KC-MARK, and UL certifications. Eaton direct substitutes (BK/GMC-630-R, BK1/GMC-630-R, GMC-630-R) maintain CSA, KC-MARK, and UL certifications. Littelfuse parts carry cULus certification. SCHURTER 0034.2514 does not list specific approval agencies. OptiFuse MSC-630MA carries cULus and UL 248 certifications. Verify that the selected substitute meets your application's certification requirements.

Q: Can I use the SCHURTER 0034.2514 in a DC application?

A: The SCHURTER 0034.2514 is rated for 250 V AC and 125 V DC. If your application requires DC operation at voltages exceeding 125 V, this part is not suitable. The Eaton variants and Littelfuse parts are rated for 250 V AC/DC and are appropriate for higher DC voltage applications.

Q: Which substitute part offers the widest operating temperature range?

A: The OptiFuse MSC-630MA provides the widest operating temperature range (-55°C to 125°C). The SCHURTER 0034.2514 offers -40°C to 85°C. Littelfuse parts are rated -25°C to 70°C. Eaton variants do not specify operating temperature limits. Select based on your application's environmental requirements.

Q: Is there a difference in melting I²t between substitute parts?

A: Yes. The original BK/GMC-630MA has melting I²t of 0.66. Eaton direct substitutes match this value exactly. Littelfuse parts have melting I²t of 0.6. SCHURTER 0034.2514 has melting I²t of 0.905. OptiFuse MSC-630MA has melting I²t of 0.688. Melting I²t determines thermal response speed. Variations within this range are acceptable for equivalent circuit protection, but verify compatibility with your specific circuit design if thermal response is critical.

Q: Which substitute part has the highest inventory availability?

A: OptiFuse MSC-630MA has the highest inventory level at 3,187 pieces in stock. SCHURTER 0034.2514 has 1,563 pieces. Eaton BK/GMC-630-R has 1,258 pieces. Littelfuse 20106300021 has 843 pieces. Inventory levels support immediate procurement for all listed substitutes.

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