BK/GMD-2A Equivalent & Substitute Parts

Part Overview

The BK/GMD-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 component is classified as obsolete, requiring identification of active equivalent and substitute parts for ongoing system support and procurement. The slow-blow response characteristic and 100 A breaking capacity at rated voltage define its operational profile. Equivalent parts maintain identical electrical and mechanical specifications while offering active product status and improved compliance certifications.

Key Parameters

Parameter	Specification
Current Rating	2 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm
Response Time	Slow Blow
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	100 A
Melting I²t	42

Substitute Part Grouping Explanation

Substitution logic for the BK/GMD-2A is based on strict equivalence of electrical and mechanical parameters. All substitute parts must satisfy the following criteria:

Primary Equivalence Parameters:

Current Rating: 2 A (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Response Time: Slow Blow (exact match required)
Fuse Type: Cartridge, Glass (exact match required)

Secondary Consideration Parameters:

Breaking Capacity @ Rated Voltage: 100 A or 35 A (both acceptable for this application)
Melting I²t: 42 or 31.6 (both acceptable for this application)
DC Cold Resistance: Varies by series (0.03325 Ohms to 0.107 Ohms)

Substitute parts are grouped into two categories: Direct Manufacturer Equivalents (Eaton - Electronics Division, active status) and Cross-Manufacturer Equivalents (Littelfuse Inc., active status). All listed substitutes maintain identical form factor, current rating, voltage rating, and response characteristics.

Parameter Comparison

Part Number	Manufacturer	Series	Current (A)	Voltage (V)	Package	Response	Breaking Capacity (A)	Melting I²t	DC Resistance (Ω)	Product Status	RoHS Status
BK/GMD-2A	Eaton	GMD	2	250	5x20mm	Slow Blow	100	42	—	Obsolete	Non-compliant
BK/GMD-2-R	Eaton	GMD	2	250	5x20mm	Slow Blow	100	42	0.107	Active	ROHS3 Compliant
BK/GDC-2A	Eaton	GDC	2	250	5x20mm	Slow Blow	35	31.6	0.03325	Active	ROHS3 Compliant
BK/S506-2-R	Eaton	S506	2	250	5x20mm	Slow Blow	35	31.6	0.03325	Active	ROHS3 Compliant
BK1/GMD-2-R	Eaton	GMD	2	250	5x20mm	Slow Blow	100	42	0.107	Active	ROHS3 Compliant
GDC-2A	Eaton	GDC	2	250	5x20mm	Slow Blow	35	31.6	0.03325	Active	ROHS3 Compliant
GMD-2-R	Eaton	GMD	2	250	5x20mm	Slow Blow	100	42	0.107	Active	ROHS3 Compliant
S506-2-R	Eaton	S506	2	250	5x20mm	Slow Blow	35	31.6	0.03325	Active	ROHS3 Compliant
0239002.HXP	Littelfuse	239	2	250	5x20mm	Slow Blow	100	50.585	0.0943	Active	ROHS3 Compliant
0239002.MXF27P	Littelfuse	239	2	250	5x20mm	Slow Blow	100	50.585	0.0943	Active	ROHS3 Compliant
0239002.MXP	Littelfuse	239	2	250	5x20mm	Slow Blow	100	50.585	0.0943	Active	ROHS3 Compliant

Engineering Selection Recommendations

Tier 1: Direct Eaton Equivalents (Recommended Primary Selection)

BK/GMD-2-R, BK1/GMD-2-R, and GMD-2-R are direct Eaton equivalents maintaining identical electrical specifications (100 A breaking capacity, 42 melting I²t) to the obsolete BK/GMD-2A. All three parts are active products with ROHS3 compliance and CSA/PSE/JET/UL certifications. BK1/GMD-2-R offers the highest inventory availability (47,692 units). These parts are functionally identical to the original specification and require no circuit re-evaluation.

Tier 2: Alternative Eaton Series (Acceptable for Reduced Breaking Capacity Applications)

BK/GDC-2A, GDC-2A, BK/S506-2-R, and S506-2-R maintain identical current, voltage, and package specifications but feature reduced breaking capacity (35 A versus 100 A) and lower melting I²t (31.6 versus 42). These parts are suitable for applications where the 100 A breaking capacity is not a circuit requirement. BK/S506-2-R and S506-2-R provide the broadest international certification coverage (BSI, CCC, CSA, CURUS, IMQ, PSE/JET, SEMKO, VDE).

Tier 3: Littelfuse Cross-Manufacturer Equivalents (Active Alternative)

0239002.HXP, 0239002.MXF27P, and 0239002.MXP are Littelfuse Series 239 fuses maintaining identical electrical parameters with 100 A breaking capacity. These parts feature higher melting I²t (50.585 versus 42) and operate across -55°C to 125°C temperature range. All three are active products with ROHS3 compliance and CE/CSA/KC/PSE/UL certifications. Cross-manufacturer substitution requires verification of holder compatibility and circuit performance characteristics.

Frequently Asked Questions (FAQ)

Q: Can BK/GMD-2A be directly replaced with BK/GMD-2-R?

A: Yes. BK/GMD-2-R is a direct Eaton equivalent maintaining identical electrical specifications (2 A, 250 V, 100 A breaking capacity, 42 melting I²t) and mechanical form factor (5mm x 20mm). The primary difference is product status (active versus obsolete) and RoHS compliance (ROHS3 versus non-compliant). No circuit modification is required.

Q: What is the difference between GMD series and GDC series fuses?

A: Both series maintain identical current rating (2 A), voltage rating (250 V), and package dimensions (5mm x 20mm). The primary difference is breaking capacity: GMD series provides 100 A breaking capacity with 42 melting I²t, while GDC series provides 35 A breaking capacity with 31.6 melting I²t. Selection depends on circuit fault current requirements.

Q: Are Littelfuse 0239002 series fuses compatible with Eaton fuse holders?

A: Littelfuse Series 239 fuses maintain identical 5mm x 20mm package dimensions and cartridge glass construction as Eaton equivalents. Mechanical compatibility with existing Eaton holders is established through form factor equivalence. Electrical performance characteristics differ slightly (50.585 melting I²t versus 42), requiring circuit-level evaluation.

Q: What does "Slow Blow" response time mean?

A: Slow Blow fuses tolerate temporary current surges without opening, responding only to sustained overcurrent conditions. All listed substitute parts maintain this characteristic, ensuring compatibility with circuits designed for slow-blow protection.

Q: Why is the BK/GMD-2A classified as obsolete?

A: Product status reflects manufacturer discontinuation. Active equivalents (BK/GMD-2-R, BK1/GMD-2-R, GMD-2-R) provide identical functionality with improved compliance certifications and ongoing manufacturing support.

Q: Can I use a 35 A breaking capacity fuse (GDC or S506 series) in place of a 100 A breaking capacity fuse (GMD series)?

A: Substitution is permissible only if circuit fault current does not exceed 35 A. Breaking capacity defines the maximum fault current the fuse can safely interrupt. Using a lower breaking capacity fuse in a higher fault current circuit creates safety risk. Verify circuit fault current specifications before selecting reduced breaking capacity alternatives.

Q: What is the significance of DC Cold Resistance values?

A: DC Cold Resistance (ranging from 0.03325 Ohms to 0.107 Ohms across listed parts) affects voltage drop and heat generation during normal operation. Lower resistance values (GDC and S506 series at 0.03325 Ohms) produce less heat than higher values (GMD series at 0.107 Ohms). Selection depends on circuit thermal design requirements.

Q: Are all substitute parts RoHS3 compliant?

A: All active substitute parts listed are ROHS3 compliant. The original BK/GMD-2A is RoHS non-compliant. RoHS3 compliance is a standard requirement for new component procurement in regulated industries.

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