BK/GMD-600MA Equivalent & Substitute Parts

Part Overview

The BK/GMD-600MA is a 600 mA, 250 V AC/DC glass cartridge fuse with 5mm x 20mm form factor manufactured by Eaton - Electronics Division. This fuse operates with slow-blow response characteristics and requires a compatible holder for installation. The part is currently classified as obsolete, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for continued circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	600 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	5mm x 20mm
Breaking Capacity @ Rated Voltage	35A
Melting I²t	3.1
Mounting Type	Requires Holder
Approval Agencies	CSA, UL
Size / Dimension	0.205" Dia x 0.787" L (5.20mm x 20.00mm)

Substitute Part Grouping Explanation

Substitution eligibility for the BK/GMD-600MA is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Current Rating: 600 mA
Voltage Rating (AC): 250 V
Fuse Type: Cartridge, Glass
Response Time: Slow Blow
Package / Case: 5mm x 20mm
Breaking Capacity @ Rated Voltage: 35A
Mounting Type: Requires Holder

All substitute parts listed below satisfy these mandatory parameters. Variations in secondary parameters such as melting I²t, DC cold resistance, operating temperature range, and RoHS compliance status do not disqualify substitution but indicate design differences between manufacturers.

Direct Manufacturer Substitutes (Eaton - Electronics Division):

BK/GMD-600-R
BK1/GMD-600-R
GMD-600-R

Cross-Manufacturer Substitutes (Littelfuse Inc., Series 239):

0239.600HXP
0239.600MXP
0239.600TXP
0239.600VXP

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage (AC)	Response Time	Package	Breaking Capacity	Melting I²t	Product Status	RoHS Status
BK/GMD-600MA	Eaton	600 mA	250 V	Slow Blow	5x20mm	35A	3.1	Obsolete	Non-compliant
BK/GMD-600-R	Eaton	600 mA	250 V	Slow Blow	5x20mm	35A	3.1	Active	ROHS3 Compliant
BK1/GMD-600-R	Eaton	600 mA	250 V	Slow Blow	5x20mm	35A	3.1	Active	ROHS3 Compliant
GMD-600-R	Eaton	600 mA	250 V	Slow Blow	5x20mm	35A	3.1	Active	ROHS3 Compliant
0239.600HXP	Littelfuse	600 mA	250 V	Slow Blow	5x20mm	35A	2.415	Active	ROHS3 Compliant
0239.600MXP	Littelfuse	600 mA	250 V	Slow Blow	5x20mm	35A	2.415	Active	ROHS3 Compliant
0239.600TXP	Littelfuse	600 mA	250 V	Slow Blow	5x20mm	35A	2.415	Active	ROHS3 Compliant
0239.600VXP	Littelfuse	600 mA	250 V	Slow Blow	5x20mm	35A	2.415	Active	ROHS3 Compliant

Engineering Selection Recommendations

Eaton GMD Series (Direct Manufacturer Substitutes):

The BK/GMD-600-R, BK1/GMD-600-R, and GMD-600-R represent the primary substitution path for the obsolete BK/GMD-600MA. All three variants are manufactured by Eaton - Electronics Division and maintain identical electrical specifications including the 3.1 melting I²t value. These parts carry active product status and ROHS3 compliance certification. Selection among these three Eaton variants depends on packaging and inventory requirements; all are functionally equivalent for circuit protection applications.

Littelfuse 239 Series (Cross-Manufacturer Substitutes):

The 0239.600HXP, 0239.600MXP, 0239.600TXP, and 0239.600VXP fuses from Littelfuse Inc. provide cross-manufacturer equivalence with identical current, voltage, response time, and mechanical specifications. These parts differ in melting I²t (2.415 versus 3.1) and DC cold resistance (0.699 Ohms versus 0.948 Ohms for Eaton variants), reflecting different thermal characteristics within the same functional class. Littelfuse variants carry expanded approval certifications (CE, CSA, KC, UL) and extended operating temperature range (-55°C to 125°C). Selection of Littelfuse alternatives is appropriate when cross-manufacturer sourcing or enhanced temperature performance is required.

Compliance Considerations:

All active substitute parts listed above carry ROHS3 compliance certification, addressing environmental regulatory requirements. The original BK/GMD-600MA is RoHS non-compliant; migration to any active substitute improves regulatory alignment for new designs or component refresh cycles.

Frequently Asked Questions (FAQ)

Q: Can BK/GMD-600-R directly replace BK/GMD-600MA in existing circuits?

A: Yes. The BK/GMD-600-R maintains identical electrical specifications (600 mA, 250 V AC, slow-blow response, 35A breaking capacity) and mechanical form factor (5mm x 20mm). Both require the same holder type. The primary difference is product status: BK/GMD-600MA is obsolete while BK/GMD-600-R is active production.

Q: What is the difference between BK/GMD-600-R, BK1/GMD-600-R, and GMD-600-R?

A: All three are Eaton-manufactured variants with identical electrical and mechanical specifications. Differences relate to packaging designation and internal part numbering conventions. Selection among these three should be based on inventory availability and procurement system requirements; they are functionally interchangeable.

Q: Can Littelfuse 0239.600MXP replace Eaton BK/GMD-600MA?

A: Yes, from an electrical and mechanical standpoint. The 0239.600MXP matches all mandatory parameters: 600 mA current rating, 250 V AC voltage, slow-blow response, 5mm x 20mm package, and 35A breaking capacity. The melting I²t differs (2.415 versus 3.1), indicating faster thermal response in the Littelfuse design. This difference does not prevent substitution but should be evaluated against specific circuit protection requirements.

Q: Are all Littelfuse 239 series variants (HXP, MXP, TXP, VXP) electrically identical?

A: Yes. The 0239.600HXP, 0239.600MXP, 0239.600TXP, and 0239.600VXP all share identical current rating (600 mA), voltage rating (250 V), response time (slow-blow), package (5mm x 20mm), breaking capacity (35A), and melting I²t (2.415). Designation differences reflect manufacturing or packaging variations within Littelfuse's product line.

Q: Does the melting I²t difference between Eaton (3.1) and Littelfuse (2.415) variants affect substitution?

A: Melting I²t is a secondary parameter that describes thermal response characteristics. Both values fall within the slow-blow fuse classification and maintain the same 35A breaking capacity. The difference indicates that Littelfuse variants respond slightly faster to thermal stress. Substitution is valid; however, circuit designers should confirm that the faster thermal response of Littelfuse variants does not conflict with circuit inrush current requirements or protection coordination schemes.

Q: What is the significance of DC cold resistance differences (0.948 Ohms for Eaton versus 0.699 Ohms for Littelfuse)?

A: DC cold resistance affects voltage drop across the fuse during normal operation. The lower resistance of Littelfuse variants (0.699 Ohms) results in reduced power dissipation compared to Eaton parts (0.948 Ohms). For 600 mA circuits, this difference is approximately 0.15 mW, which is negligible in most applications. Substitution is valid without circuit redesign.

Q: Are all substitute parts approved by the same certification agencies?

A: Eaton variants carry CSA and UL approvals. Littelfuse variants carry CE, CSA, KC, and UL approvals. All parts meet the minimum certification requirements (CSA, UL) for the original BK/GMD-600MA. Littelfuse variants provide additional certifications suitable for international applications.

Q: Can I use these fuses in applications with operating temperatures below -55°C or above 125°C?

A: Littelfuse variants are rated for -55°C to 125°C operation. Eaton variants do not specify operating temperature limits in the provided data. For applications outside the Littelfuse range, Eaton variants may be appropriate, but operating temperature specifications should be confirmed with the manufacturer before final selection.

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