BK/MDA-8/10 Equivalent & Substitute Parts Reference

Part Overview

The BK/MDA-8/10 is an 800 mA, 250 V AC ceramic cartridge fuse manufactured by Eaton - Electronics Division, designed for 3AB and 3AG holder applications with dimensions of 1/4" x 1-1/4" (6.35mm x 31.75mm). This component operates with slow-blow response characteristics and holds CSA and UL approvals. The part is currently classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for continued system operation and maintenance.

Key Parameters

Parameter	Value
Current Rating	800 mA
Voltage Rating - AC	250 V
Fuse Type	Cartridge, Ceramic
Response Time	Slow Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4"
Mounting Type	Requires Holder
Size / Dimension	0.250" Dia x 1.250" L (6.35mm x 31.75mm)
Approval Agency	CSA, UL
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the BK/MDA-8/10 is determined by strict alignment with the following critical parameters:

Primary Compatibility Criteria:

Current Rating: 800 mA (exact match required)
Voltage Rating - AC: 250 V (exact match required)
Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
Response Time: Slow Blow (exact match required)
Mounting Type: Requires Holder (exact match required)
Physical Dimensions: 0.250" Dia x 1.250" L (exact match required)

Secondary Compatibility Considerations:

Fuse Type: Ceramic or Glass construction both acceptable within the same holder specification
Voltage Rating - DC: Substitute parts may exceed the original DC rating without compromising AC circuit protection
Approval Agencies: Substitute parts must maintain recognized certifications (CSA, UL, CE, cURus)
RoHS Compliance: Active substitutes must meet current RoHS3 standards

All identified substitute parts meet these criteria and are classified as either Direct Manufacturer equivalents or Parametric Equivalents based on electrical and mechanical parameter alignment.

Parameter Comparison

Parameter	BK/MDA-8/10 (Eaton)	0001.2523 (SCHURTER)	0326.800MXP (Littelfuse)	0326.800VXP (Littelfuse)	0326.800HXP (Littelfuse)
Current Rating (Amps)	800 mA	800 mA	800 mA	800 mA	800 mA
Voltage Rating - AC	250 V	250 V	250 V	250 V	250 V
Voltage Rating - DC	Not specified	63 V	125 V	125 V	125 V
Fuse Type	Cartridge, Ceramic	Cartridge, Glass	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic
Response Time	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"
Size / Dimension	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	0.250" Dia x 1.252" L (6.35mm x 31.80mm)	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)
Approval Agency	CSA, UL	cURus	CE, CSA, UL	CE, CSA, UL	CE, CSA, UL
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Operating Temperature	Not specified	-40°C ~ 85°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Breaking Capacity @ Rated Voltage	Not specified	1.5kA AC, 20kA DC	100A AC, 10kA DC	100A AC, 10kA DC	100A AC, 10kA DC

Engineering Selection Recommendations

Direct Manufacturer Equivalents (Littelfuse 326 Series):

The 0326.800MXP, 0326.800VXP, and 0326.800HXP represent direct functional equivalents manufactured by Littelfuse Inc. All three parts are classified as Active products with identical electrical ratings (800 mA, 250 V AC, 125 V DC), ceramic construction, slow-blow response, and 3AB/3AG holder compatibility. These parts carry CE, CSA, and UL certifications, exceeding the original BK/MDA-8/10 approval scope. All three are RoHS3 compliant and operate across an extended temperature range of -55°C to 125°C. The Littelfuse 326 series provides superior breaking capacity specifications (100A AC, 10kA DC) compared to the obsolete Eaton component. These substitutes are interchangeable for direct replacement applications.

Parametric Equivalent (SCHURTER 0001.2523):

The SCHURTER 0001.2523 maintains electrical compatibility with 800 mA and 250 V AC ratings and identical mechanical packaging. This part differs in construction type (glass cartridge versus ceramic) and DC voltage rating (63 V versus 125 V). The SCHURTER component carries cURus certification and is RoHS3 compliant. Physical dimensions are nominally equivalent (0.250" Dia x 1.252" L versus 0.250" Dia x 1.250" L). Selection of this substitute is appropriate for AC-only circuit applications where the lower DC voltage rating does not conflict with system requirements.

Compliance Consideration:

All substitute parts are RoHS3 compliant, addressing regulatory requirements that the obsolete BK/MDA-8/10 does not meet. For applications subject to RoHS directives or environmental compliance mandates, substitution with any of the identified active parts is necessary.

Frequently Asked Questions (FAQ)

Q: Can the 0326.800MXP, 0326.800VXP, and 0326.800HXP be used interchangeably with the BK/MDA-8/10?

A: Yes. All three Littelfuse parts are direct equivalents with identical current ratings (800 mA), AC voltage ratings (250 V), fuse type (ceramic cartridge), response time (slow blow), and mechanical packaging (3AB, 3AG, 1/4" x 1-1/4"). They are physically and electrically compatible for direct replacement in existing 3AB/3AG holder assemblies.

Q: What is the difference between the three Littelfuse substitute options?

A: The 0326.800MXP, 0326.800VXP, and 0326.800HXP are functionally identical in all critical parameters. Differences, if any, relate to internal construction variants or manufacturing date codes that do not affect electrical performance or compatibility. Selection among these three parts can be based on inventory availability.

Q: Can the SCHURTER 0001.2523 replace the BK/MDA-8/10 in all applications?

A: The SCHURTER 0001.2523 is compatible for AC circuit protection at 800 mA and 250 V. However, it is a glass cartridge fuse with a 63 V DC rating, compared to the ceramic construction of the original part. For applications requiring DC voltage protection above 63 V, the Littelfuse ceramic alternatives (0326.800MXP, 0326.800VXP, 0326.800HXP) are more appropriate. For AC-only circuits, the SCHURTER part is fully equivalent.

Q: Are all substitute parts RoHS compliant?

A: Yes. All identified substitute parts (0001.2523, 0326.800MXP, 0326.800VXP, 0326.800HXP) are RoHS3 compliant. The original BK/MDA-8/10 is RoHS non-compliant. Substitution is necessary for applications subject to RoHS directives.

Q: Do the substitute parts fit existing 3AB and 3AG holders?

A: Yes. All substitute parts maintain the 3AB and 3AG holder specification and physical dimensions of 0.250" diameter x 1.250" length (6.35mm x 31.75mm), with the SCHURTER part at 1.252" length (31.80mm). These dimensional tolerances are within standard holder acceptance ranges and do not affect mechanical fit or electrical contact.

Q: What certifications do the substitute parts carry?

A: The Littelfuse parts (0326.800MXP, 0326.800VXP, 0326.800HXP) carry CE, CSA, and UL certifications. The SCHURTER part (0001.2523) carries cURus certification. All certifications meet or exceed the original BK/MDA-8/10 approval scope (CSA, UL).

Q: What is the operating temperature range of the substitute parts?

A: The Littelfuse 326 series operates from -55°C to 125°C. The SCHURTER part operates from -40°C to 85°C. Both ranges exceed typical industrial and commercial application requirements and represent improvements over the unspecified operating temperature of the original part.

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