BK/GMC-1A Equivalent & Substitute Parts

Part Overview

The BK/GMC-1A is a 1 A, 250 V AC/DC glass cartridge fuse with a 5mm x 20mm form factor manufactured by Eaton - Electronics Division. This fuse requires a holder for installation and features medium blow response characteristics with a breaking capacity of 35 A at rated voltage. The part is classified as obsolete, necessitating identification of active equivalent and substitute components for ongoing system maintenance and new designs. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts offer functional alternatives with variations in response time or voltage ratings that may require application verification.

Key Parameters

Parameter	Value
Current Rating	1 A
Voltage Rating - AC	250 V
Package / Case	5mm x 20mm
Fuse Type	Cartridge, Glass
Response Time	Medium Blow
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	35 A
Melting I²t	1.8
DC Cold Resistance	0.156 Ohms
Size / Dimension	0.205" Dia x 0.787" L (5.20mm x 20.00mm)

Substitute Part Grouping Explanation

Substitution of the BK/GMC-1A is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Current Rating: 1 A (exact match required)
Voltage Rating - AC: 250 V (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Mounting Type: Requires Holder (exact match required)

Secondary Substitution Criteria:

Response Time: Medium Blow (preferred for direct equivalence)
Breaking Capacity @ Rated Voltage: 35 A (preferred for direct equivalence)
Melting I²t: 1.8 (preferred for direct equivalence)

Parts are grouped into three categories:

Direct Manufacturer Equivalents: Parts from Eaton - Electronics Division that maintain identical electrical characteristics, response time, and breaking capacity. These parts are interchangeable without application modification.

Parametric Equivalents: Parts that match all primary substitution criteria and maintain identical response time and breaking capacity. These parts are functionally equivalent across all critical parameters.

Similar Parts: Parts that match primary substitution criteria but differ in response time (Slow Blow vs. Medium Blow), melting I²t values, or DC voltage ratings. These parts require application assessment to confirm suitability.

Parameter Comparison

Part Number	Manufacturer	Current (A)	Voltage AC (V)	Response Time	Package	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ω)	Product Status	RoHS Status
BK/GMC-1A	Eaton	1	250	Medium Blow	5x20mm	35	1.8	0.156	Obsolete	Non-compliant
BK/GMC-1-R	Eaton	1	250	Medium Blow	5x20mm	35	1.8	0.156	Active	ROHS3 Compliant
BK1/GMC-1-R	Eaton	1	250	Medium Blow	5x20mm	35	1.8	0.156	Active	ROHS3 Compliant
GMC-1-R	Eaton	1	250	Medium Blow	5x20mm	35	1.8	0.156	Active	ROHS3 Compliant
0213001.MXP	Littelfuse	1	250	Slow Blow	5x20mm	35	19.2	0.1165	Active	ROHS3 Compliant
0218001.MXP	Littelfuse	1	250	Slow Blow	5x20mm	35	6.73	0.0613	Active	ROHS3 Compliant
0218001.TXP	Littelfuse	1	250	Slow Blow	5x20mm	35	6.73	0.0613	Active	ROHS3 Compliant
0239001.HXP	Littelfuse	1	250	Slow Blow	5x20mm	35	11.295	0.2965	Active	ROHS3 Compliant
0034.2516	SCHURTER	1	250	Medium Blow	5x20mm	80	3.6	Not specified	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Preferred):

The Eaton GMC series parts BK/GMC-1-R, BK1/GMC-1-R, and GMC-1-R are direct functional equivalents to the obsolete BK/GMC-1A. These parts maintain identical electrical specifications, response time characteristics, and breaking capacity. All three are active products with ROHS3 compliance, making them suitable for new designs and legacy system replacements without circuit modification. Selection among these three variants depends on packaging requirements and inventory availability.

Alternative Selection (Littelfuse):

The SCHURTER part 0034.2516 is a parametric equivalent that matches all primary substitution criteria with medium blow response time. This part features an 80 A breaking capacity, exceeding the original 35 A specification, and operates across a 250 V AC and 125 V DC voltage range. This part is suitable for applications requiring enhanced breaking capacity and dual voltage operation.

Conditional Substitution (Slow Blow Response):

Littelfuse parts 0213001.MXP, 0218001.MXP, 0218001.TXP, and 0239001.HXP match the primary substitution criteria but employ slow blow response characteristics instead of medium blow. These parts are suitable only for applications where slow blow response is functionally equivalent to medium blow response. Melting I²t values vary significantly across these options (6.73 to 19.2), requiring application-specific assessment. All parts carry ROHS3 compliance and active product status.

Compliance Considerations:

The original BK/GMC-1A is RoHS non-compliant. All recommended substitutes are ROHS3 compliant, supporting regulatory requirements for new designs and updated systems. Approval agencies vary across manufacturers; Eaton parts carry CSA, KC-MARK, and UL certifications, while Littelfuse parts carry expanded certifications including CE, PSE, SEMKO, and VDE. SCHURTER part 0034.2516 carries no specified approval agencies.

Frequently Asked Questions (FAQ)

Q: Can I use BK/GMC-1-R as a direct replacement for BK/GMC-1A?

A: Yes. BK/GMC-1-R is a direct functional equivalent manufactured by Eaton. It maintains identical current rating (1 A), voltage rating (250 V AC), response time (Medium Blow), breaking capacity (35 A), and package dimensions (5mm x 20mm). The primary difference is product status (Active vs. Obsolete) and RoHS compliance (ROHS3 Compliant vs. Non-compliant).

Q: What is the difference between BK/GMC-1-R, BK1/GMC-1-R, and GMC-1-R?

A: All three parts are manufactured by Eaton and maintain identical electrical and mechanical specifications. The differences are nomenclature variants within the GMC series. Selection should be based on part availability and internal design documentation requirements. All three are active products with ROHS3 compliance.

Q: Can I substitute a Littelfuse slow blow fuse for the medium blow BK/GMC-1A?

A: Littelfuse slow blow parts (0213001.MXP, 0218001.MXP, 0218001.TXP, 0239001.HXP) match the primary substitution criteria of 1 A, 250 V AC, and 5mm x 20mm package. However, response time differs from the original medium blow characteristic. Substitution is permissible only if application requirements allow slow blow response. Melting I²t values vary significantly across these parts, requiring verification that the selected part provides appropriate protection for the target circuit.

Q: What is the advantage of the SCHURTER 0034.2516 fuse?

A: The SCHURTER 0034.2516 maintains medium blow response time matching the original BK/GMC-1A and provides an 80 A breaking capacity compared to the original 35 A. Additionally, this part supports both 250 V AC and 125 V DC operation, offering flexibility for dual-voltage applications. Operating temperature range is -40°C to 85°C.

Q: Are all substitute parts RoHS compliant?

A: Yes. All recommended substitute parts carry ROHS3 compliance. The original BK/GMC-1A is RoHS non-compliant. Substitution with any recommended part satisfies RoHS compliance requirements for new designs and updated systems.

Q: Does package size remain consistent across all substitutes?

A: Yes. All substitute parts maintain the 5mm x 20mm cartridge form factor, ensuring mechanical compatibility with existing fuse holders. No holder modification is required when substituting between recommended parts.

Q: What approval agencies certify these fuses?

A: Eaton GMC series parts carry CSA, KC-MARK, and UL certifications. Littelfuse parts carry expanded certifications including CE, CSA, CCC, PSE, SEMKO, UL, and VDE. SCHURTER part 0034.2516 carries no specified approval agencies. Selection should consider application-specific regulatory requirements.

Q: Can I use multiple substitute parts interchangeably in the same system?

A: Direct equivalents (BK/GMC-1-R, BK1/GMC-1-R, GMC-1-R) are fully interchangeable. Littelfuse and SCHURTER parts differ in response time or breaking capacity and should not be mixed within a single circuit unless application requirements explicitly permit such variation. Consistent fuse selection across a system is recommended for predictable circuit protection behavior.

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