BK/MDA-3-2/10 Equivalent & Substitute Parts

Part Overview

The BK/MDA-3-2/10 is a 3.2 A, 250 V AC/DC ceramic cartridge fuse manufactured by Eaton - Electronics Division. This fuse is designed for use with 3AB and 3AG holders and features slow-blow response characteristics. The part is classified as obsolete, necessitating identification of active equivalent and substitute components to maintain circuit protection functionality in applications requiring identical electrical and mechanical specifications.

Key Parameters

Parameter	Value
Current Rating	3.2 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Ceramic
Response Time	Slow Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4"
Size / Dimension	0.250" Dia x 1.250" L (6.35mm x 31.75mm)
Mounting Type	Requires Holder
Color	Black

Substitute Part Grouping Explanation

Substitution of the BK/MDA-3-2/10 is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Current Rating: 3.2 A
Voltage Rating (AC): 250 V
Fuse Type: Cartridge, Ceramic
Response Time: Slow Blow
Package / Case: 3AB, 3AG, 1/4" x 1-1/4"
Size / Dimension: 0.250" Dia x 1.250" L (6.35mm x 31.75mm)
Mounting Type: Requires Holder

All identified substitute parts meet these mandatory parameters. Substitute parts are grouped into three categories based on manufacturer and product status:

Direct Manufacturer Substitutes (Eaton): BK/MDA-3-2/10-R and MDA-3-2/10-R are active Eaton products with identical electrical and mechanical specifications to the obsolete main part.

Similar Manufacturer Substitutes (Littelfuse): 032603.2MXP, 032603.2VXP, and 032603.2HXP are Littelfuse ceramic cartridge fuses meeting all mandatory electrical and mechanical parameters.

Parameter Comparison

Parameter	BK/MDA-3-2/10	BK/MDA-3-2/10-R	MDA-3-2/10-R	032603.2MXP	032603.2VXP	032603.2HXP
Manufacturer	Eaton	Eaton	Eaton	Littelfuse	Littelfuse	Littelfuse
Current Rating (A)	3.2	3.2	3.2	3.2	3.2	3.2
Voltage Rating (AC)	250 V	250 V	250 V	250 V	250 V	250 V
Fuse Type	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow Blow	Slow Blow	Slow Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"
Size / Dimension	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)
Mounting Type	Requires Holder	Requires Holder	Requires Holder	Requires Holder	Requires Holder	Requires Holder
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	CSA, UL	CE, CSA, UL	CE, CSA, UL	CE, CSA, K-MARK, PSE, UL	CE, CSA, KC, PSE, UL	CE, CSA, K-MARK, PSE, UL
DC Cold Resistance (Ohms)	Not Provided	0.045	0.045	0.0539	0.0539	0.0539
Melting I²t	Not Provided	17.5	17.5	214	214	214
Breaking Capacity @ Rated Voltage	Not Provided	Not Provided	Not Provided	100A	100A	100A

Engineering Selection Recommendations

For Direct Manufacturer Continuity:

BK/MDA-3-2/10-R and MDA-3-2/10-R are the primary substitutes for the obsolete BK/MDA-3-2/10. Both are active Eaton products with identical electrical and mechanical specifications. These parts provide direct manufacturer continuity and are ROHS3 compliant. BK/MDA-3-2/10-R includes CE certification in addition to CSA and UL approvals, while MDA-3-2/10-R also carries CE certification. Both parts are available in bulk packaging.

For Cross-Manufacturer Substitution:

The Littelfuse 326 series ceramic cartridge fuses (032603.2MXP, 032603.2VXP, and 032603.2HXP) provide parametric equivalence across all mandatory electrical and mechanical specifications. These parts are active products with ROHS3 compliance and extended approval agency certifications including K-MARK, PSE, and KC certifications. The Littelfuse parts feature higher breaking capacity (100A) and melting I²t (214) compared to the Eaton direct substitutes (17.5 I²t), indicating enhanced fault current handling capability. All Littelfuse parts operate across the temperature range of -55°C to 125°C.

Compliance Considerations:

The original BK/MDA-3-2/10 is RoHS non-compliant. All substitute parts are ROHS3 compliant, meeting current regulatory requirements. Applications requiring specific regulatory compliance should reference the approval agency certifications listed for each substitute part.

Frequently Asked Questions (FAQ)

Q: Can BK/MDA-3-2/10-R and MDA-3-2/10-R be used interchangeably with the obsolete BK/MDA-3-2/10?

A: Yes. Both Eaton substitutes meet all mandatory electrical and mechanical parameters: 3.2 A current rating, 250 V AC voltage rating, slow-blow response, ceramic cartridge construction, and 3AB/3AG package compatibility with 0.250" Dia x 1.250" L dimensions. Both are active products with current manufacturing support.

Q: What is the difference between the Eaton direct substitutes and the Littelfuse alternatives?

A: The Eaton substitutes (BK/MDA-3-2/10-R and MDA-3-2/10-R) maintain manufacturer continuity with melting I²t of 17.5. The Littelfuse alternatives (032603.2MXP, 032603.2VXP, 032603.2HXP) provide parametric equivalence with higher melting I²t (214) and breaking capacity (100A), indicating enhanced fault current handling. All parts are mechanically and electrically compatible for the specified application parameters.

Q: Are the Littelfuse 326 series fuses (032603.2MXP, 032603.2VXP, 032603.2HXP) identical?

A: The three Littelfuse parts are parametrically identical across all electrical and mechanical specifications. Differences exist in approval agency certifications: 032603.2MXP and 032603.2HXP carry K-MARK certification, while 032603.2VXP carries KC certification. Selection should be based on regional regulatory requirements.

Q: Will these substitute fuses fit existing 3AB and 3AG holders?

A: Yes. All substitute parts maintain the identical package specification (3AB, 3AG, 1/4" x 1-1/4") and physical dimensions (0.250" Dia x 1.250" L / 6.35mm x 31.75mm). Direct mechanical compatibility with existing holders is confirmed.

Q: What is the significance of the higher melting I²t values in the Littelfuse parts?

A: The Littelfuse ceramic cartridge fuses feature melting I²t of 214 compared to 17.5 for the Eaton substitutes. This parameter indicates the thermal energy required to melt the fuse element. The higher value in Littelfuse parts reflects enhanced fault current handling capability while maintaining the same 3.2 A current rating and slow-blow response characteristics.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts (BK/MDA-3-2/10-R, MDA-3-2/10-R, 032603.2MXP, 032603.2VXP, and 032603.2HXP) are ROHS3 compliant. The original BK/MDA-3-2/10 is RoHS non-compliant, making substitution necessary for applications requiring current regulatory compliance.

Q: What approval agencies certify these substitute fuses?

A: Eaton substitutes carry CE, CSA, and UL certifications. Littelfuse parts carry CE, CSA, and UL certifications with additional regional certifications: K-MARK and PSE for 032603.2MXP and 032603.2HXP; KC and PSE for 032603.2VXP. Selection should align with application-specific regulatory requirements.

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