BK/MDL-5-R Equivalent & Substitute Parts

Part Overview

The BK/MDL-5-R is a 5 A, 250 V AC/DC slow-blow glass fuse cartridge manufactured by Eaton - Electronics Division. This component operates in the 3AB and 3AG package format with dimensions of 0.250" diameter by 1.250" length (6.35mm x 31.75mm). The part requires a compatible fuse holder for installation and is currently active in production with 917 pieces in stock.

Substitute parts are identified when equivalent electrical and mechanical parameters are maintained across manufacturers. Alternative sources ensure supply chain continuity and provide options for procurement, inventory management, and application-specific compliance requirements.

Key Parameters

Parameter	Value
Current Rating	5 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
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)
Breaking Capacity @ Rated Voltage	200A
Mounting Type	Requires Holder
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts are classified into two categories based on electrical and mechanical parameter alignment:

Parametric Equivalents maintain all critical electrical specifications: 5 A current rating, 250 V AC voltage rating, slow-blow response time, 200A breaking capacity, 3AB/3AG package format, and identical physical dimensions (0.250" x 1.250"). These parts are direct functional replacements within the same circuit protection application.

Similar Parts share the core current rating (5 A) and voltage rating (250 V AC) with the same package and physical dimensions, but may include additional voltage ratings (DC specifications) or different breaking capacity ratings. These parts are suitable for applications where the additional specifications do not conflict with circuit requirements.

The following key parameters determine substitution eligibility:

Current Rating: 5 A (mandatory match)
Voltage Rating (AC): 250 V (mandatory match)
Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (mandatory match)
Size / Dimension: 0.250" Dia x 1.250" L (mandatory match)
Fuse Type: Cartridge, Glass (mandatory match)
Response Time: Slow Blow (mandatory match)
Mounting Type: Requires Holder (mandatory match)

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (A)	Voltage Rating AC (V)	Response Time	Package / Case	Size / Dimension	Breaking Capacity @ Rated Voltage	DC Cold Resistance (Ohms)	RoHS Status	Approval Agency	Product Status
BK/MDL-5-R	Eaton - Electronics Division	5	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	200A	0.025	ROHS3 Compliant	CE, CSA, UL	Active
BK/MDQ-5	Eaton - Electronics Division	5	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	200A	0.0265	RoHS non-compliant	CSA, UL	Active
MDL-5-R	Eaton - Electronics Division	5	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	200A	0.025	ROHS3 Compliant	CE, CSA, UL	Active
0001.2531	SCHURTER Inc.	5	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" Dia x 1.252" L (6.35mm x 31.80mm)	1.5kA AC, 20kA DC	Not provided	ROHS3 Compliant	cURus	Active
0313005.HXIDP	Littelfuse Inc.	5	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	200A	0.0214	ROHS3 Compliant	CE, CSA, KC, PSE, UL	Active
0313005.HXP	Littelfuse Inc.	5	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	200A	0.0214	ROHS3 Compliant	CE, CSA, K-MARK, PSE, UL	Active
0313005.MXP	Littelfuse Inc.	5	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	200A	0.0214	ROHS3 Compliant	CE, CSA, K-MARK, PSE, UL	Active
0313005.VXIDP	Littelfuse Inc.	5	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	200A	0.0214	ROHS3 Compliant	CE, CSA, KC, PSE, UL	Active

Engineering Selection Recommendations

Parametric Equivalents (Direct Replacements)

The following parts are parametric equivalents of BK/MDL-5-R and maintain identical electrical and mechanical specifications:

MDL-5-R (Eaton - Electronics Division): Identical part designation without manufacturer prefix. Maintains all electrical parameters, RoHS3 compliance, and CE/CSA/UL certifications. Suitable for direct substitution in all applications.
0313005.HXIDP (Littelfuse Inc.): Maintains all core electrical parameters with expanded approval agency coverage (CE, CSA, KC, PSE, UL). RoHS3 compliant. Operating temperature range -55°C to 125°C provides extended thermal performance.
0313005.HXP (Littelfuse Inc.): Parametric equivalent with K-MARK certification in addition to CE, CSA, PSE, and UL. RoHS3 compliant. Highest inventory availability (5083 pieces). Operating temperature range -55°C to 125°C.
0313005.MXP (Littelfuse Inc.): Parametric equivalent with K-MARK certification. RoHS3 compliant. Operating temperature range -55°C to 125°C. Melting I²t value of 276 differs from main part specification.
0313005.VXIDP (Littelfuse Inc.): Parametric equivalent with KC and PSE certifications. RoHS3 compliant. Operating temperature range -55°C to 125°C.

Parametric Equivalent with Compliance Consideration

BK/MDQ-5 (Eaton - Electronics Division): Maintains all electrical parameters and identical physical dimensions. DC cold resistance specification (0.0265 Ohms) is within acceptable tolerance of main part (0.025 Ohms). RoHS non-compliant status requires evaluation against application requirements. CSA and UL certifications present; CE certification absent.

Similar Part with Extended Specifications

0001.2531 (SCHURTER Inc.): Shares 5 A current rating, 250 V AC voltage rating, slow-blow response, and 3AB/3AG package format. Includes 63 V DC rating not present in main part. Breaking capacity specification differs (1.5kA AC, 20kA DC versus 200A). Operating temperature range -40°C to 85°C. cURus certification (combined CSA/UL mark). RoHS3 compliant. Suitable for applications requiring DC voltage capability.

Frequently Asked Questions (FAQ)

Q: Can BK/MDQ-5 be used as a direct replacement for BK/MDL-5-R?

A: BK/MDQ-5 maintains identical electrical specifications (5 A, 250 V AC, slow-blow, 200A breaking capacity) and physical dimensions. The primary difference is RoHS compliance status. BK/MDQ-5 is RoHS non-compliant, while BK/MDL-5-R is ROHS3 compliant. Selection depends on application regulatory requirements. Both parts carry CSA and UL certifications; BK/MDL-5-R includes CE certification.

Q: What is the difference between Littelfuse 0313005.HXP and 0313005.MXP?

A: Both parts are parametric equivalents with identical electrical specifications, physical dimensions, and RoHS3 compliance. The primary difference is the melting I²t value: 0313005.HXP specifies 140, while 0313005.MXP specifies 276. Both maintain 5 A current rating and 250 V AC voltage rating. Selection between these parts depends on application-specific thermal response requirements.

Q: Is SCHURTER 0001.2531 compatible with the same fuse holder as BK/MDL-5-R?

A: Yes. Both parts use the 3AB and 3AG package format with identical physical dimensions (0.250" diameter x 1.250" length). The 0001.2531 includes an additional 63 V DC voltage rating not present in BK/MDL-5-R. The breaking capacity specification differs (1.5kA AC, 20kA DC for 0001.2531 versus 200A for BK/MDL-5-R). Physical compatibility with the fuse holder is confirmed; application compatibility requires evaluation of circuit voltage and current requirements.

Q: Which substitute part has the best inventory availability?

A: Littelfuse 0313005.HXP has the highest inventory availability with 5083 pieces in stock. This part is a parametric equivalent with identical electrical specifications, RoHS3 compliance, and expanded approval agency coverage (CE, CSA, K-MARK, PSE, UL).

Q: Do all substitute parts meet the same regulatory certifications as BK/MDL-5-R?

A: No. BK/MDL-5-R carries CE, CSA, and UL certifications. Littelfuse parts (0313005.HXIDP, 0313005.HXP, 0313005.MXP, 0313005.VXIDP) carry CE, CSA, and UL certifications with additional regional certifications (KC, K-MARK, PSE). BK/MDQ-5 carries CSA and UL certifications without CE. SCHURTER 0001.2531 carries cURus certification (combined CSA/UL mark). Application requirements determine which certification set is necessary.

Q: Can BK/MDL-5-R be replaced with 0001.2531 in all applications?

A: Physical compatibility is confirmed through identical package format and dimensions. Electrical compatibility requires evaluation. The 0001.2531 includes a 63 V DC rating and higher breaking capacity (1.5kA AC, 20kA DC) compared to BK/MDL-5-R (200A). Applications operating at DC voltages above 250 V or requiring higher breaking capacity may benefit from 0001.2531. Applications with DC voltage requirements below 63 V or standard breaking capacity requirements can use either part.

Q: What does "Requires Holder" mean for mounting type?

A: All listed parts are cartridge-style fuses that require a compatible fuse holder for installation. The fuse does not mount directly to a circuit board or panel. The 3AB and 3AG package designation specifies the holder type required. Ensure the fuse holder in your application is rated for 3AB or 3AG cartridge fuses before selecting any substitute part.

Q: Are there differences in DC cold resistance between substitute parts?

A: Yes. BK/MDL-5-R specifies 0.025 Ohms. BK/MDQ-5 specifies 0.0265 Ohms. Littelfuse parts (0313005.HXIDP, 0313005.HXP, 0313005.MXP, 0313005.VXIDP) specify 0.0214 Ohms. These variations are within acceptable tolerance for fuse cartridge applications. DC cold resistance affects voltage drop across the fuse during normal operation. Applications with strict voltage drop requirements should evaluate these specifications.

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