BK/MDL-7 Equivalent & Substitute Parts

Part Overview

The BK/MDL-7 is a 7 A, 250 V AC/DC slow-blow glass cartridge fuse manufactured by Eaton - Electronics Division. This component is classified as obsolete, requiring identification of active equivalent and substitute parts for ongoing system support and procurement. The BK/MDL-7 operates in 3AB and 3AG holder configurations with a 1/4" x 1-1/4" form factor. Equivalent parts are available from Eaton and third-party manufacturers including Littelfuse Inc. and SCHURTER Inc., with improved compliance profiles and active product status.

Key Parameters

Parameter	Value
Current Rating	7 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	200 A
Mounting Type	Requires Holder

Substitute Part Grouping Explanation

Substitution of the BK/MDL-7 is determined by strict equivalence across the following parameters: current rating (7 A), voltage rating (250 V AC), fuse type (cartridge glass), response time (slow blow), package configuration (3AB, 3AG), physical dimensions (0.250" Dia x 1.250" L), and breaking capacity (200 A). All substitute parts listed maintain these electrical and mechanical specifications without deviation.

Substitute parts are grouped into two categories:

Direct Manufacturer Substitutes (Eaton - Electronics Division): BK/MDL-7-R, MDL-7-R, and BK/MDL-7OX-R represent active-status alternatives from the original manufacturer with identical electrical performance and improved compliance certifications.

Parametric Equivalents (Cross-Manufacturer): Parts from Littelfuse Inc. (0313007.HXIDP, 0313007.HXP, 0313007.MXP, 0313007.VXIDP), SCHURTER Inc. (0034.5243), and Eaton series variants (BK/MDQ-7, MDQ-7) provide functional equivalence with identical core electrical parameters and holder compatibility.

Parameter Comparison

Part Number	Manufacturer	Current (A)	Voltage (V AC)	Response Time	Package	Breaking Capacity (A)	Product Status	RoHS Status
BK/MDL-7	Eaton	7	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	200	Obsolete	Non-compliant
BK/MDL-7-R	Eaton	7	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	200	Active	ROHS3 Compliant
MDL-7-R	Eaton	7	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	200	Active	RoHS Compliant
BK/MDL-7OX-R	Eaton	7	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	200	Active	RoHS Compliant
BK/MDQ-7	Eaton	7	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	200	Active	Non-compliant
MDQ-7	Eaton	7	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	200	Active	Not specified
0034.5243	SCHURTER Inc.	7	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	200	Obsolete	ROHS3 Compliant
0313007.HXIDP	Littelfuse Inc.	7	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	200	Active	ROHS3 Compliant
0313007.HXP	Littelfuse Inc.	7	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	200	Active	ROHS3 Compliant
0313007.MXP	Littelfuse Inc.	7	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	200	Active	ROHS3 Compliant
0313007.VXIDP	Littelfuse Inc.	7	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	200	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: BK/MDL-7-R or MDL-7-R (Eaton - Electronics Division)

These direct manufacturer substitutes provide the highest compatibility assurance. Both parts maintain identical electrical specifications and mechanical form factor to the BK/MDL-7. BK/MDL-7-R carries ROHS3 compliance certification and active product status. MDL-7-R offers RoHS compliance with active status. Both are approved by CE, CSA, and UL agencies.

Secondary Recommendation: 0313007.MXP (Littelfuse Inc.)

This parametric equivalent maintains all critical electrical and mechanical parameters with ROHS3 compliance and active product status. The 0313007.MXP series carries comprehensive approval certifications (CE, CSA, K-MARK, PSE, UL) and demonstrates the highest inventory availability (2807 units). Operating temperature range (-55°C ~ 125°C) extends beyond the original specification.

Alternative Recommendation: 0313007.HXP or 0313007.HXIDP (Littelfuse Inc.)

Both parts provide equivalent electrical performance with ROHS3 compliance and active status. These options offer expanded approval certifications and operating temperature specifications suitable for demanding environments.

Consideration for Compliance-Critical Applications: Parts with ROHS3 compliance (BK/MDL-7-R, 0313007.HXIDP, 0313007.HXP, 0313007.MXP, 0313007.VXIDP) are required for applications subject to RoHS Directive 2011/65/EU and amendments.

Frequently Asked Questions (FAQ)

Q: Can BK/MDL-7 be directly replaced with BK/MDL-7-R?

A: Yes. BK/MDL-7-R is a direct manufacturer substitute with identical electrical ratings (7 A, 250 V AC), response time (slow blow), and mechanical form factor (3AB, 3AG, 1/4" x 1-1/4"). The primary difference is product status (active vs. obsolete) and improved RoHS3 compliance.

Q: What is the difference between MDL series and MDQ series fuses?

A: Both MDL-7-R and MDQ-7 maintain identical current rating (7 A), voltage rating (250 V AC), response time (slow blow), and package configuration (3AB, 3AG). The MDQ series represents an alternative product line within Eaton's portfolio with equivalent electrical performance. DC cold resistance differs slightly (0.018 Ohms for MDL vs. 0.01375 Ohms for MDQ).

Q: Are Littelfuse 0313007 series parts compatible with 3AB and 3AG holders?

A: Yes. All Littelfuse 0313007 series parts (0313007.HXIDP, 0313007.HXP, 0313007.MXP, 0313007.VXIDP) are specified for 3AB and 3AG holder configurations with identical 1/4" x 1-1/4" dimensions. These parts are mechanically and electrically interchangeable.

Q: Which substitute part has the best availability?

A: 0313007.MXP (Littelfuse Inc.) has the highest inventory availability at 2807 units in stock, followed by 0313007.HXIDP at 1233 units and MDQ-7 at 1006 units.

Q: Do all substitute parts carry the same approval certifications as the original BK/MDL-7?

A: No. The original BK/MDL-7 carries CSA and UL approvals. Substitute parts carry expanded certifications: BK/MDL-7-R and MDL-7-R include CE, CSA, and UL. Littelfuse parts include CE, CSA, K-MARK, PSE, and UL. SCHURTER 0034.5243 carries CSA and UL. Select the substitute part based on required certifications for your application.

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

A: The original BK/MDL-7 does not specify an operating temperature range. Substitute parts from Littelfuse (0313007 series) and SCHURTER (0034.5243) specify -55°C ~ 125°C operating range. Eaton MDL and MDQ series do not specify operating temperature limits.

Q: Can BK/MDL-7 be used interchangeably with SCHURTER 0034.5243?

A: Yes, from an electrical and mechanical standpoint. Both parts are 7 A, 250 V AC slow-blow cartridge fuses in 3AB, 3AG configuration with 200 A breaking capacity. However, SCHURTER 0034.5243 is classified as obsolete. Active alternatives are recommended for new designs and long-term procurement.

Q: What does RoHS3 compliance mean for fuse selection?

A: RoHS3 compliance indicates conformance to Directive 2011/65/EU (Restriction of Hazardous Substances). Parts marked ROHS3 Compliant (BK/MDL-7-R, 0313007.HXIDP, 0313007.HXP, 0313007.MXP, 0313007.VXIDP, 0034.5243) are required for applications subject to EU environmental regulations and are suitable for export to regulated markets.

Q: Is the melting I²t value critical for substitution?

A: Melting I²t is provided for reference but does not affect substitution eligibility. The original BK/MDL-7 specifies 42.7 A²s. Littelfuse parts specify 347 A²s. Both values are within acceptable ranges for 7 A slow-blow fuses and do not prevent interchangeability based on the provided parameters.

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