BK/GMA-600MA Equivalent & Substitute Parts

Part Overview

The BK/GMA-600MA is a 600 mA, 250 V AC/DC fast-blow glass cartridge fuse with a 5mm x 20mm form factor manufactured by Eaton - Electronics Division. This component requires a compatible fuse holder for installation and is rated for a breaking capacity of 35 A at rated voltage. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for continued system operation and maintenance.

Key Parameters

Parameter	Value
Current Rating	600 mA
Voltage Rating (AC)	250 V
Response Time	Fast Blow
Package / Case	5mm x 20mm
Fuse Type	Cartridge, Glass
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	35 A
DC Cold Resistance	0.256 Ohms
Melting I²t	0.32

Substitute Part Grouping Explanation

Substitution of the BK/GMA-600MA is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Current Rating: 600 mA
Voltage Rating (AC): 250 V
Response Time: Fast Blow
Package / Case: 5mm x 20mm
Fuse Type: Cartridge, Glass
Mounting Type: Requires Holder

Acceptable Variation Parameters:

Breaking Capacity: Substitute parts with equal or higher breaking capacity (35 A or greater) are acceptable
DC Cold Resistance: Minor variations within component tolerance are acceptable
Melting I²t: Variations reflect different fuse construction but do not affect substitution eligibility when other parameters match
Approval Agencies: Substitute parts with equivalent or broader certifications are acceptable
Operating Temperature Range: Substitute parts with equal or broader temperature ranges are acceptable
RoHS Compliance: Active substitute parts with improved compliance status are acceptable

Substitute parts are grouped into two categories: direct manufacturer equivalents from Eaton - Electronics Division and parametric equivalents from alternative manufacturers (Littelfuse Inc. and OptiFuse) that meet all mandatory matching parameters.

Parameter Comparison

Parameter	BK/GMA-600MA	BK/GMA-600-R	GMA-600-R	BK1/GMA-600-R	0235.600HXP	0235.600MXP	0235.600VXP	FSC-600MA
Manufacturer	Eaton	Eaton	Eaton	Eaton	Littelfuse	Littelfuse	Littelfuse	OptiFuse
Current Rating (Amps)	600 mA	600 mA	600 mA	600 mA	600 mA	600 mA	600 mA	600 mA
Voltage Rating - AC	250 V	250 V	250 V	250 V	250 V	250 V	250 V	250 V
Response Time	Fast Blow	Fast Blow	Fast Blow	Fast Blow	Fast Blow	Fast Blow	Fast Blow	Fast Blow
Package / Case	5mm x 20mm	5mm x 20mm	5mm x 20mm	5mm x 20mm	5mm x 20mm	5mm x 20mm	5mm x 20mm	5mm x 20mm
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Mounting Type	Requires Holder	Requires Holder	Requires Holder	Requires Holder	Requires Holder	Requires Holder	Requires Holder	Requires Holder
Breaking Capacity @ Rated Voltage	35 A	35 A	35 A	35 A	35 A	35 A	35 A	100 A
DC Cold Resistance (Ohms)	0.256	0.256	0.256	0.256	0.3195	0.3195	0.3195	0.1224
Melting I²t	0.32	0.32	0.32	0.32	0.112	0.112	0.112	Not specified
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	RoHS Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Operating Temperature Range	Not specified	Not specified	Not specified	Not specified	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 90°C
Approval Agencies	CCC, CSA, MITI, UL	CSA, PSE, UL	CSA, PSE, UL	CSA, PSE, UL	CE, CSA, KC, UL	CE, CSA, KC, UL	CE, CSA, K-MARK, UL	cULus, UL 248

Engineering Selection Recommendations

Eaton - Electronics Division Direct Equivalents (Recommended for Primary Selection):

The parts BK/GMA-600-R, GMA-600-R, and BK1/GMA-600-R are direct manufacturer equivalents from Eaton - Electronics Division. All three maintain identical electrical and mechanical specifications to the obsolete BK/GMA-600MA, including current rating, voltage rating, response time, package dimensions, breaking capacity, DC cold resistance, and melting I²t. These parts are classified as active products with improved RoHS compliance status. Selection among these three Eaton equivalents is based on packaging preference (all available in bulk) and inventory availability. BK/GMA-600-R offers the highest inventory level at 1961 pieces.

Littelfuse Inc. Parametric Equivalents (Alternative Selection):

The parts 0235.600HXP, 0235.600MXP, and 0235.600VXP from Littelfuse Inc. Series 235 meet all mandatory matching parameters and are classified as active products. These components provide broader operating temperature ranges (-55°C to 125°C) compared to the main part specification. Littelfuse parts feature ROHS3 compliance and expanded approval agency certifications including CE and KC/K-MARK. The melting I²t value of 0.112 differs from the main part (0.32), reflecting alternative fuse construction. DC cold resistance is 0.3195 Ohms, within acceptable tolerance variation. Selection among the three Littelfuse variants is based on specific approval agency requirements: 0235.600HXP and 0235.600MXP include KC certification, while 0235.600VXP includes K-MARK certification.

OptiFuse Parametric Equivalent (Enhanced Breaking Capacity Selection):

The part FSC-600MA from OptiFuse Series FSC meets all mandatory matching parameters and is classified as an active product. This component provides a higher breaking capacity of 100 A compared to the 35 A specification of the main part, offering enhanced fault protection capability. FSC-600MA features ROHS3 compliance, cULus and UL 248 certifications, and the lowest DC cold resistance at 0.1224 Ohms. Operating temperature range is -55°C to 90°C. FSC-600MA offers the highest inventory availability at 4360 pieces.

Frequently Asked Questions (FAQ)

Q: Can BK/GMA-600MA be directly replaced with BK/GMA-600-R?

A: Yes. BK/GMA-600-R is a direct manufacturer equivalent from Eaton - Electronics Division with identical electrical and mechanical specifications. All critical parameters including current rating (600 mA), voltage rating (250 V), response time (fast blow), package dimensions (5mm x 20mm), and breaking capacity (35 A) are identical. The primary difference is product status: BK/GMA-600-R is active while BK/GMA-600MA is obsolete.

Q: What is the difference between the three Eaton equivalents (BK/GMA-600-R, GMA-600-R, BK1/GMA-600-R)?

A: All three Eaton equivalents maintain identical electrical and mechanical specifications. The differences are in part numbering convention and RoHS compliance designation. BK/GMA-600-R and BK1/GMA-600-R are designated as ROHS3 Compliant, while GMA-600-R is designated as RoHS Compliant. All three are active products with bulk packaging. Selection is based on inventory availability and internal part numbering requirements.

Q: Are Littelfuse 235 series fuses (0235.600HXP, 0235.600MXP, 0235.600VXP) compatible substitutes?

A: Yes. All three Littelfuse parts meet the mandatory matching parameters: 600 mA current rating, 250 V voltage rating, fast-blow response, 5mm x 20mm package, and 35 A breaking capacity. These parts are active products with ROHS3 compliance and broader operating temperature ranges (-55°C to 125°C). The melting I²t value of 0.112 reflects alternative fuse construction but does not affect substitution eligibility. Selection among the three variants depends on specific approval agency requirements for your application.

Q: What is the advantage of FSC-600MA from OptiFuse?

A: FSC-600MA meets all mandatory matching parameters and provides a higher breaking capacity of 100 A compared to the 35 A specification of the main part. This enhanced breaking capacity offers increased fault protection capability. FSC-600MA also features the lowest DC cold resistance (0.1224 Ohms) and the highest inventory availability (4360 pieces). This part is suitable for applications requiring enhanced overcurrent protection performance.

Q: Do all substitute parts fit in the same fuse holder as BK/GMA-600MA?

A: Yes. All substitute parts maintain the identical 5mm x 20mm package dimensions and cartridge glass fuse type. All parts require a compatible fuse holder for installation. Physical compatibility with existing fuse holders is confirmed across all listed substitutes.

Q: Which substitute part should I select for new designs?

A: For new designs, selection should prioritize active products with current compliance certifications. All listed substitute parts are active products. For primary selection, Eaton equivalents (BK/GMA-600-R, GMA-600-R, BK1/GMA-600-R) provide direct manufacturer continuity. For applications requiring enhanced breaking capacity, FSC-600MA from OptiFuse is suitable. For applications requiring broader operating temperature ranges, Littelfuse 235 series parts (0235.600HXP, 0235.600MXP, 0235.600VXP) are appropriate.

Q: Are there RoHS compliance differences between substitute parts?

A: Yes. The main part BK/GMA-600MA is RoHS non-compliant. All substitute parts are RoHS compliant: Eaton parts are designated as either ROHS3 Compliant or RoHS Compliant; Littelfuse parts are ROHS3 Compliant; OptiFuse FSC-600MA is ROHS3 Compliant. For applications subject to RoHS requirements, all listed substitutes are acceptable.

Q: What approval agencies certify these fuse products?

A: The main part BK/GMA-600MA carries CCC, CSA, MITI, and UL certifications. Eaton equivalents carry CSA, PSE, and UL certifications. Littelfuse parts carry CE, CSA, KC/K-MARK, and UL certifications. OptiFuse FSC-600MA carries cULus and UL 248 certifications. Selection based on approval agency requirements depends on your specific application and regional regulatory requirements.

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