BK/MDA-B-30-R Ceramic Fuse Cartridge Equivalent & Substitute Parts

Part Overview

The BK/MDA-B-30-R is a 30 A ceramic fuse cartridge manufactured by Eaton - Electronics Division, rated for 250 V AC and 125 V DC operation. This slow-blow cartridge fuse is designed for applications requiring overcurrent protection in industrial and commercial electrical systems. The part is currently active in production with 900 pieces in stock.

Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, and functional performance characteristics. Alternative sources provide identical or compatible specifications for applications where component availability, lead time, or supply chain considerations necessitate substitution.

Key Parameters

Parameter	Specification
Current Rating	30 A
Voltage Rating - AC	250 V
Voltage Rating - DC	125 V
Fuse Type	Cartridge, Ceramic
Response Time	Slow Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (6.35mm x 31.75mm)
Mounting Type	Requires Holder
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for the BK/MDA-B-30-R is determined by the following mandatory parameters:

Critical Matching Parameters:

Current Rating: 30 A (exact match required)
Voltage Rating - AC: 250 V (exact match required)
Voltage Rating - DC: 125 V (exact match required)
Fuse Type: Cartridge, Ceramic (exact match required)
Response Time: Slow Blow (exact match required)
Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
Mounting Type: Requires Holder (exact match required)

All identified substitute parts meet these critical parameters. Variations in breaking capacity, melting I²t, DC cold resistance, and approval agencies do not preclude substitution when the above parameters are identical. These secondary parameters reflect manufacturing tolerances and regional certification requirements.

Parameter Comparison

Parameter	BK/MDA-B-30-R (Eaton)	BK/MDA-30-R (Eaton)	0326030.HXP (Littelfuse)	0326030.MXP (Littelfuse)
Manufacturer	Eaton - Electronics Division	Eaton - Electronics Division	Littelfuse Inc.	Littelfuse Inc.
Series	MDA	MDA	326	326
Current Rating (Amps)	30 A	30 A	30 A	30 A
Voltage Rating - AC	250 V	250 V	250 V	250 V
Voltage Rating - DC	125 V	125 V	125 V	125 V
Fuse Type	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic
Response Time	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"
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)
Mounting Type	Requires Holder	Requires Holder	Requires Holder	Requires Holder
Product Status	Active	Active	Active	Active
Breaking Capacity @ Rated Voltage	1.5kA AC, 10kA DC	1.5kA AC, 10kA DC	400A AC, 600A DC	400A AC, 600A DC
Melting I²t	1096.7	1096.7	1690	1690
DC Cold Resistance (Ohms)	0.002465	0.00243	0.0019	0.0019
Approval Agency	CSA, UR	CE, CSA, UL	CE, CSA, K-MARK, PSE, UL	CE, CSA, K-MARK, PSE, UL
Operating Temperature	Not specified	Not specified	-55°C ~ 125°C	-55°C ~ 125°C
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Inventory (Pcs)	900	2475	742	2347

Engineering Selection Recommendations

BK/MDA-30-R (Eaton - Electronics Division): This part is a direct equivalent from the same manufacturer. It carries identical electrical and mechanical specifications to the BK/MDA-B-30-R. The BK/MDA-30-R includes additional compliance certifications (CE, UL) and ROHS3 compliance status. With 2475 pieces in inventory, this part offers superior availability for immediate procurement.

0326030.HXP (Littelfuse Inc., Series 326): This Littelfuse ceramic fuse cartridge meets all critical electrical and mechanical parameters. It provides broader international approval coverage (CE, CSA, K-MARK, PSE, UL) and specifies an operating temperature range of -55°C to 125°C. ROHS3 compliance and REACH unaffected status are documented. Breaking capacity and melting I²t values differ from the Eaton parts, reflecting Littelfuse manufacturing specifications. Inventory of 742 pieces supports availability.

0326030.MXP (Littelfuse Inc., Series 326): This alternative from Littelfuse carries identical specifications to the 0326030.HXP, with the primary distinction being higher inventory availability at 2347 pieces. Both Littelfuse parts provide equivalent functional performance and compliance documentation.

Selection between these substitutes depends on supply chain requirements, regional certification needs, and inventory availability. All parts are active products suitable for direct substitution in applications requiring 30 A ceramic fuse cartridges rated for 250 V AC and 125 V DC operation.

Frequently Asked Questions (FAQ)

Q: Can the BK/MDA-30-R be used as a direct replacement for the BK/MDA-B-30-R?

A: Yes. Both parts are manufactured by Eaton - Electronics Division and share identical current ratings (30 A), voltage ratings (250 V AC, 125 V DC), fuse type (cartridge, ceramic), response time (slow blow), and mechanical dimensions (3AB, 3AG, 1/4" x 1-1/4"). The BK/MDA-30-R includes additional compliance certifications and ROHS3 compliance documentation.

Q: Are Littelfuse 0326030.HXP and 0326030.MXP interchangeable with the Eaton BK/MDA-B-30-R?

A: Yes. Both Littelfuse parts meet all critical electrical and mechanical specifications: 30 A current rating, 250 V AC and 125 V DC voltage ratings, ceramic cartridge fuse type, slow-blow response, and 3AB/3AG package dimensions. Differences in breaking capacity and melting I²t reflect manufacturer design variations and do not affect substitution eligibility for standard overcurrent protection applications.

Q: What is the significance of the different breaking capacity values between Eaton and Littelfuse parts?

A: Breaking capacity indicates the maximum fault current the fuse can safely interrupt at rated voltage. Eaton parts specify 1.5kA AC and 10kA DC, while Littelfuse parts specify 400A AC and 600A DC. Both values are within acceptable ranges for ceramic fuse cartridges in this current class. Selection should consider the specific fault current levels in the application circuit.

Q: Do all substitute parts require the same holder?

A: Yes. All parts use the 3AB and 3AG package standard with 1/4" x 1-1/4" (6.35mm x 31.75mm) dimensions. They are mechanically compatible with holders designed for this package specification.

Q: What compliance certifications should I consider when selecting a substitute?

A: The BK/MDA-B-30-R carries CSA and UR approvals. The BK/MDA-30-R adds CE and UL certifications. Littelfuse parts (0326030.HXP and 0326030.MXP) provide the broadest certification coverage: CE, CSA, K-MARK, PSE, and UL. Selection depends on regional regulatory requirements and end-application standards.

Q: Are there temperature operating range differences between these parts?

A: The Eaton BK/MDA-B-30-R and BK/MDA-30-R do not specify operating temperature ranges in available documentation. Littelfuse parts specify -55°C to 125°C operating range. For applications with extreme temperature requirements, the Littelfuse parts provide documented thermal specifications.

Q: Which part offers the best inventory availability?

A: The BK/MDA-30-R (Eaton) offers the highest inventory at 2475 pieces, followed by 0326030.MXP (Littelfuse) at 2347 pieces. Both support immediate procurement for high-volume requirements.

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