BK/GMC-63MA Equivalent & Substitute Parts

Part Overview

The BK/GMC-63MA is a 63 mA, 250 V AC/DC glass cartridge fuse manufactured by Eaton - Electronics Division. This fuse is designed for 5mm x 20mm holder applications and features medium blow response characteristics. The part is currently classified as obsolete, necessitating identification of active equivalent and substitute components for ongoing system support and new designs. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts offer functional compatibility with documented parameter variations.

Key Parameters

Parameter	Value
Current Rating	63 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm
Response Time	Medium Blow
Breaking Capacity @ Rated Voltage	35A
Melting I²t	0.0027
DC Cold Resistance	10.35 Ohms
Mounting Type	Requires Holder
Approval Agencies	CSA, KC-MARK, UL

Substitute Part Grouping Explanation

Substitution classification is determined by strict adherence to the following critical parameters: current rating (63 mA), voltage rating (250 V AC), fuse type (cartridge glass), and physical package (5mm x 20mm). Parts are grouped into three categories based on parameter alignment:

Direct Equivalents (Eaton GMC Series): Parts BK/GMC-63-R, BK1/GMC-63-R, and GMC-63-R maintain identical electrical specifications including 63 mA current rating, 250 V voltage rating, medium blow response, 35A breaking capacity, and 0.0027 Melting I²t. These parts differ only in product status (active versus obsolete) and RoHS compliance level. All three are manufactured by Eaton - Electronics Division within the GMC series.

Parametric Equivalents (Littelfuse 201 Series): Parts 20100630001, 20100630001P, 20100630021, 20100630021P, and 20100630301P share the core electrical parameters of 63 mA current rating and 250 V voltage rating. These parts feature medium blow response and identical 5mm x 20mm physical dimensions. Documented variations include higher breaking capacity (80A versus 35A) and higher Melting I²t (0.011 versus 0.0027).

Similar Substitute (Littelfuse 218 Series): Part 0218.063HXP maintains 63 mA current rating, 250 V voltage rating, and 5mm x 20mm package dimensions. This part differs in response time classification (slow blow versus medium blow), higher Melting I²t (0.0117 versus 0.0027), and higher DC cold resistance (17.65 Ohms versus 10.35 Ohms).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (mA)	Voltage Rating (V AC)	Response Time	Package	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ohms)	Product Status	RoHS Status
BK/GMC-63MA	Eaton	63	250	Medium Blow	5x20mm	35	0.0027	10.35	Obsolete	Non-compliant
BK/GMC-63-R	Eaton	63	250	Medium Blow	5x20mm	35	0.0027	10.35	Active	ROHS3 Compliant
BK1/GMC-63-R	Eaton	63	250	Medium Blow	5x20mm	35	0.0027	10.35	Active	ROHS3 Compliant
GMC-63-R	Eaton	63	250	Medium Blow	5x20mm	35	0.0027	10.35	Active	ROHS3 Compliant
0218.063HXP	Littelfuse	63	250	Slow Blow	5x20mm	35	0.0117	17.65	Active	ROHS3 Compliant
20100630001	Littelfuse	63	250	Medium Blow	5x20mm	80	0.011	Not provided	Active	ROHS3 Compliant
20100630001P	Littelfuse	63	250	Medium Blow	5x20mm	80	0.011	Not provided	Active	ROHS3 Compliant
20100630021	Littelfuse	63	250	Medium Blow	5x20mm	80	0.011	Not provided	Active	ROHS3 Compliant
20100630021P	Littelfuse	63	250	Medium Blow	5x20mm	80	0.011	Not provided	Active	ROHS3 Compliant
20100630301P	Littelfuse	63	250	Medium Blow	5x20mm	80	0.011	Not provided	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): Select BK/GMC-63-R, BK1/GMC-63-R, or GMC-63-R. All three parts are manufactured by Eaton - Electronics Division and maintain complete electrical and mechanical equivalence to the BK/GMC-63MA. These parts are active products with ROHS3 compliance. Selection among these three variants depends on packaging requirements and inventory availability.

For Active Product Requirement with Compliance: The Eaton GMC series direct equivalents (BK/GMC-63-R, BK1/GMC-63-R, GMC-63-R) are the primary selection for applications requiring active product status and RoHS3 compliance. All three carry identical approval certifications (CSA, KC-MARK, UL or CSA, KC, UL).

For Littelfuse Alternatives: The 201 series parts (20100630001, 20100630001P, 20100630021, 20100630021P, 20100630301P) are parametric equivalents suitable for applications where higher breaking capacity (80A) is acceptable. These parts maintain medium blow response and identical current/voltage ratings. The 0218.063HXP (Littelfuse 218 series) is suitable only for applications where slow blow response is required and higher Melting I²t (0.0117) is compatible with circuit protection requirements.

Compliance Considerations: All substitute parts listed are ROHS3 compliant and carry appropriate regulatory certifications. The Littelfuse 201 series carries cULus certification, while the Littelfuse 218 series carries expanded certifications including CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE.

Frequently Asked Questions (FAQ)

Q: Can BK/GMC-63-R be used as a direct replacement for BK/GMC-63MA?

A: Yes. BK/GMC-63-R is a direct equivalent with identical electrical specifications (63 mA, 250 V, medium blow, 35A breaking capacity, 0.0027 Melting I²t) and physical dimensions (5mm x 20mm). The primary difference is product status (active versus obsolete) and RoHS compliance level (ROHS3 compliant versus non-compliant).

Q: What is the difference between BK/GMC-63-R, BK1/GMC-63-R, and GMC-63-R?

A: All three parts are manufactured by Eaton - Electronics Division and maintain identical electrical and mechanical specifications. Differences exist only in part number designation and packaging format (bulk). Selection can be based on inventory availability and internal part numbering conventions.

Q: Can Littelfuse 201 series parts (20100630001, 20100630021, etc.) replace the BK/GMC-63MA?

A: Littelfuse 201 series parts are parametric equivalents with identical current rating (63 mA), voltage rating (250 V), response time (medium blow), and physical package (5mm x 20mm). These parts feature higher breaking capacity (80A versus 35A) and higher Melting I²t (0.011 versus 0.0027). Substitution is acceptable where these parameter variations do not conflict with circuit protection requirements.

Q: What is the difference between 20100630001 and 20100630001P?

A: Both parts are identical in electrical specifications and physical dimensions. The "P" designation indicates packaging format variation. Both are Littelfuse 201 series parts with 63 mA current rating, 250 V voltage rating, and medium blow response.

Q: Can the Littelfuse 0218.063HXP (slow blow) replace the BK/GMC-63MA (medium blow)?

A: The 0218.063HXP maintains identical current rating (63 mA), voltage rating (250 V), and physical package (5mm x 20mm). However, it features slow blow response instead of medium blow, higher Melting I²t (0.0117 versus 0.0027), and higher DC cold resistance (17.65 Ohms versus 10.35 Ohms). Substitution is limited to applications where slow blow response characteristics are compatible with circuit protection requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed (Eaton GMC series and Littelfuse 201 and 218 series) are ROHS3 compliant. The original BK/GMC-63MA is RoHS non-compliant.

Q: What are the approval certifications for these fuses?

A: Eaton GMC series parts carry CSA, KC-MARK, and UL certifications (or CSA, KC, UL for BK1/GMC-63-R). Littelfuse 201 series parts carry cULus certification. Littelfuse 218 series (0218.063HXP) carries CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE certifications.

Q: What is the operating temperature range for these fuses?

A: Eaton GMC series parts do not specify operating temperature range in the provided data. Littelfuse 201 series parts operate from -25°C to 70°C. Littelfuse 218 series (0218.063HXP) operates from -55°C to 125°C.

Q: Do all these fuses require a holder for installation?

A: Yes. All parts listed (BK/GMC-63MA and all substitutes) are cartridge-type fuses that require a 5mm x 20mm holder for installation. They are not panel-mount or inline fuses.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message