BK/GMC-2A Equivalent & Substitute Parts

Part Overview

The BK/GMC-2A is a 2 A, 250 V AC/DC glass cartridge fuse with a 5mm x 20mm form factor manufactured by Eaton - Electronics Division. This fuse is classified as obsolete, requiring identification of active equivalent and substitute components for ongoing circuit protection applications. The medium blow response time and 100 A breaking capacity at rated voltage establish the baseline performance characteristics for substitution analysis. Alternative parts must maintain electrical compatibility while meeting current regulatory compliance standards.

Key Parameters

Parameter	Value
Current Rating	2 A
Voltage Rating (AC)	250 V
Package / Case	5mm x 20mm
Fuse Type	Cartridge, Glass
Response Time	Medium Blow
Breaking Capacity @ Rated Voltage	100 A
Mounting Type	Requires Holder
DC Cold Resistance	0.043 Ohms
Melting I²t	8.9

Substitute Part Grouping Explanation

Substitution of the BK/GMC-2A is determined by strict alignment of electrical and mechanical parameters. The following criteria establish valid substitution relationships:

Primary Substitution Criteria:

Current Rating: 2 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 Compatibility Factors:

Response Time: Medium Blow or Slow Blow (both acceptable for circuit protection continuity)
Breaking Capacity: Minimum 35 A at rated voltage (all substitutes meet or exceed this threshold)
DC Cold Resistance: Variance acceptable within normal manufacturing tolerances

Substitution Categories:

Direct Manufacturer Equivalents (Eaton - Electronics Division): Parts BK/GMC-2-R, BK1/GMC-2-R, and GMC-2-R are parametric equivalents from the same manufacturer series. These parts maintain identical electrical specifications and form factor while offering active product status and improved regulatory compliance (ROHS3 Compliant).

Similar Cross-Manufacturer Substitutes (Littelfuse Inc.): Parts 0213002.MXP, 0218002.HXP, 0218002.MXP, and 0218002.TXP meet all primary substitution criteria. These components are functionally equivalent with identical current, voltage, and package specifications. Response time differs (Slow Blow vs. Medium Blow), and breaking capacity is reduced to 35 A, but these parameters remain within acceptable operational ranges for standard circuit protection applications.

Voltage-Variant Substitutes: Parts 0233002.MXBP and 0233002.MXP operate at 125 V AC, representing a voltage downgrade. These parts are not direct substitutes for 250 V applications but may be considered for circuits operating at reduced voltage levels.

Parameter Comparison

Part Number	Manufacturer	Current (A)	Voltage AC (V)	Package	Response Time	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ω)	Product Status	RoHS Status
BK/GMC-2A	Eaton	2	250	5x20mm	Medium Blow	100	8.9	0.043	Obsolete	Non-compliant
BK/GMC-2-R	Eaton	2	250	5x20mm	Medium Blow	100	8.9	0.043	Active	ROHS3 Compliant
BK1/GMC-2-R	Eaton	2	250	5x20mm	Medium Blow	100	8.9	0.043	Active	ROHS3 Compliant
GMC-2-R	Eaton	2	250	5x20mm	Medium Blow	100	8.9	0.043	Active	ROHS3 Compliant
0213002.MXP	Littelfuse	2	250	5x20mm	Slow Blow	35	92.705	0.0452	Active	ROHS3 Compliant
0218002.HXP	Littelfuse	2	250	5x20mm	Slow Blow	35	14.45	0.0293	Active	ROHS3 Compliant
0218002.MXP	Littelfuse	2	250	5x20mm	Slow Blow	35	14.45	0.0293	Active	ROHS3 Compliant
0218002.TXP	Littelfuse	2	250	5x20mm	Slow Blow	35	14.45	0.0293	Active	ROHS3 Compliant
0239002.HXP	Littelfuse	2	250	5x20mm	Slow Blow	100	50.585	0.0943	Active	ROHS3 Compliant

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Recommended):

BK/GMC-2-R, BK1/GMC-2-R, and GMC-2-R are the preferred substitutes for the obsolete BK/GMC-2A. These Eaton components maintain identical electrical and mechanical specifications, including current rating, voltage rating, response time, breaking capacity, and form factor. All three parts are active products with ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with current manufacturing standards. Selection among these three variants depends on packaging requirements and inventory availability.

Tier 2 - Cross-Manufacturer Equivalents:

Littelfuse parts 0218002.HXP, 0218002.MXP, and 0218002.TXP provide functional equivalence with identical current, voltage, and package specifications. These components feature Slow Blow response time (compared to Medium Blow in the original) and reduced breaking capacity (35 A vs. 100 A). The reduced breaking capacity remains adequate for standard circuit protection applications. All three parts carry active product status and ROHS3 compliance. Selection among these variants is based on inventory availability and specific circuit requirements.

Tier 3 - Extended Compatibility:

0213002.MXP and 0239002.HXP are functionally compatible alternatives. 0213002.MXP offers Slow Blow response with 35 A breaking capacity. 0239002.HXP provides Slow Blow response with 100 A breaking capacity, matching the original breaking capacity specification. Both parts are active, ROHS3 compliant, and suitable for applications where response time flexibility is acceptable.

Voltage-Reduced Alternatives:

0233002.MXBP and 0233002.MXP operate at 125 V AC and are not suitable for direct replacement in 250 V circuits. These parts are applicable only for circuits designed to operate at 125 V AC.

Regulatory Compliance:

All recommended substitutes carry CSA, UL, and KC-MARK certifications, maintaining alignment with the original part's approval agency requirements. ROHS3 compliance across all active substitutes ensures compatibility with current environmental and manufacturing regulations.

Frequently Asked Questions (FAQ)

Q: Can BK/GMC-2-R be used as a direct replacement for BK/GMC-2A?

A: Yes. BK/GMC-2-R is a direct parametric equivalent with identical current rating (2 A), voltage rating (250 V AC), package dimensions (5mm x 20mm), response time (Medium Blow), and breaking capacity (100 A). The primary difference is product status (Active vs. Obsolete) and regulatory compliance (ROHS3 Compliant vs. Non-compliant). BK/GMC-2-R is the recommended replacement.

Q: What is the difference between Medium Blow and Slow Blow response times?

A: Response time characterizes the fuse's reaction speed to overcurrent conditions. Medium Blow fuses (BK/GMC-2A, BK/GMC-2-R) respond faster to sustained overcurrent. Slow Blow fuses (Littelfuse 0218002 series, 0213002.MXP) tolerate brief current surges before responding. Both response types are acceptable for standard circuit protection; selection depends on circuit characteristics and tolerance for transient current spikes.

Q: Can Littelfuse 0218002.HXP replace BK/GMC-2A in all applications?

A: 0218002.HXP meets all primary substitution criteria: 2 A current rating, 250 V AC voltage rating, 5mm x 20mm package, and Cartridge Glass fuse type. The breaking capacity is reduced from 100 A to 35 A, and response time is Slow Blow instead of Medium Blow. For standard circuit protection applications, this substitution is functionally equivalent. Applications requiring 100 A breaking capacity should use 0239002.HXP instead.

Q: Are the Littelfuse 0218002.HXP, 0218002.MXP, and 0218002.TXP parts interchangeable?

A: Yes. All three parts share identical electrical specifications: 2 A current rating, 250 V AC voltage rating, 5mm x 20mm package, Slow Blow response time, 35 A breaking capacity, and 14.45 melting I²t. Selection among these variants is based on packaging availability and inventory status.

Q: Why do some substitutes have different melting I²t values?

A: Melting I²t represents the thermal energy required to melt the fuse element. Variations in melting I²t reflect differences in fuse element design and material composition between manufacturers. All provided substitutes maintain the same current rating and voltage rating, ensuring circuit protection at the specified 2 A threshold. Differences in melting I²t do not affect substitution validity for standard applications.

Q: Can 0233002.MXP (125 V AC) be used in a 250 V AC circuit?

A: No. 0233002.MXP is rated for 125 V AC maximum and must not be used in 250 V AC circuits. Using an undersized voltage-rated fuse creates a safety hazard and violates electrical code requirements. This part is applicable only for circuits designed to operate at 125 V AC or lower.

Q: What certifications should I verify when selecting a substitute?

A: The original BK/GMC-2A carries CSA, KC-MARK, MITI, and UL certifications. All recommended Tier 1 and Tier 2 substitutes maintain CSA, UL, and KC-MARK certifications. Verify that the selected substitute carries certifications required by your application's regulatory framework and regional standards.

Q: Is RoHS compliance important for this substitution?

A: Yes. The original BK/GMC-2A is RoHS non-compliant. All active substitutes are ROHS3 compliant, meeting current environmental regulations for electronic component manufacturing. ROHS3 compliance is required for new designs and recommended for replacement components in existing systems to ensure long-term regulatory alignment.

Q: What is the difference between BK/GMC-2-R, BK1/GMC-2-R, and GMC-2-R?

A: All three parts are parametric equivalents with identical electrical and mechanical specifications. The differences are nomenclature variants within the Eaton GMC series. Selection among these three is based on part number availability from your supplier and internal inventory management systems. All three are active products with ROHS3 compliance.

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