BK/MDL-7-R Glass Cartridge Fuse 7A 250VAC Equivalent & Substitute Parts

Part Overview

The BK/MDL-7-R is a 7 A, 250 V AC/DC slow-blow glass cartridge fuse manufactured by Eaton Electronics Division. This component requires a 3AB or 3AG fuse holder and is designed for circuit protection in industrial and commercial applications. The part is currently active in production with 755 units in stock. Substitute parts are identified based on matching electrical ratings, mechanical dimensions, response characteristics, and approval certifications to ensure direct functional equivalence in holder-based installations.

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"
Physical Dimensions	0.250" Dia x 1.250" L (6.35mm x 31.75mm)
Breaking Capacity @ Rated Voltage	200 A
Mounting Type	Requires Holder
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the BK/MDL-7-R are qualified based on the following mandatory parameters:

Electrical Equivalence:

Current Rating: 7 A (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Response Time: Slow Blow (exact match required)
Breaking Capacity: 200 A (exact match required)

Mechanical Compatibility:

Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
Physical Dimensions: 0.250" Dia x 1.250" L (exact match required)
Mounting Type: Requires Holder (exact match required)

Regulatory & Compliance:

Approval Agencies: CE, CSA, UL certifications (minimum requirement)
RoHS Status: ROHS3 Compliant (preferred)
REACH Status: REACH Unaffected (preferred)

All substitute parts listed below meet these criteria and are direct functional equivalents suitable for installation in 3AB and 3AG fuse holders without modification.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (A)	Voltage Rating (V AC)	Response Time	Package / Case	Dimensions (in / mm)	Breaking Capacity (A)	DC Cold Resistance (Ohms)	Product Status	Approval Agencies	RoHS Status	Inventory (Pcs)
BK/MDL-7-R	Eaton - Electronics Division	7	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250" (6.35 x 31.75)	200	0.018	Active	CE, CSA, UL	ROHS3 Compliant	755
BK/MDQ-7	Eaton - Electronics Division	7	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250" (6.35 x 31.75)	200	0.01375	Active	CSA, UL	RoHS non-compliant	990
MDL-7-R	Eaton - Electronics Division	7	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250" (6.35 x 31.75)	200	0.018	Active	CE, CSA, UL	RoHS Compliant	864
0034.5243	SCHURTER Inc.	7	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250" (6.35 x 31.75)	200	Not specified	Obsolete	CSA, UL	ROHS3 Compliant	826
0313007.HXIDP	Littelfuse Inc.	7	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250" (6.35 x 31.75)	200	0.0128	Active	CE, CSA, K-MARK, PSE, UL	ROHS3 Compliant	1233
0313007.HXP	Littelfuse Inc.	7	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250" (6.35 x 31.75)	200	0.0128	Active	CE, CSA, K-MARK, PSE, UL	ROHS3 Compliant	1128
0313007.MXP	Littelfuse Inc.	7	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250" (6.35 x 31.75)	200	0.0128	Active	CE, CSA, K-MARK, PSE, UL	ROHS3 Compliant	2807
0313007.VXP	Littelfuse Inc.	7	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250" (6.35 x 31.75)	200	0.0128	Active	CE, CSA, KC, PSE, UL	ROHS3 Compliant	863

Engineering Selection Recommendations

Primary Substitutes (Preferred):

The Littelfuse 313 series fuses (0313007.HXIDP, 0313007.HXP, 0313007.MXP, 0313007.VXP) are the recommended substitutes for the BK/MDL-7-R. All four variants are currently active products with ROHS3 compliance and extended approval certifications including CE, CSA, K-MARK, PSE, and UL. These parts offer superior inventory availability (863–2807 units) and lower DC cold resistance (0.0128 Ohms) compared to the main part. The 0313007.MXP variant has the highest stock level at 2807 units.

Secondary Substitutes (Conditional):

The Eaton MDL-7-R (without BK prefix) is functionally identical to the main part with matching electrical and mechanical specifications, identical DC cold resistance, and equivalent certifications. This variant is suitable for direct replacement with 864 units in stock.

The Eaton BK/MDQ-7 is electrically and mechanically equivalent but carries RoHS non-compliance status and lacks CE certification. This part is suitable only for applications where RoHS compliance is not required and CSA/UL certifications are sufficient.

Obsolete Substitute (Not Recommended for New Designs):

The SCHURTER 0034.5243 meets all electrical and mechanical parameters with ROHS3 compliance but is marked as obsolete. This part should not be selected for new designs or long-term production applications due to discontinued status.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts directly in my existing 3AB or 3AG fuse holder?

A: Yes. All substitute parts listed are mechanically and electrically identical to the BK/MDL-7-R with matching dimensions (0.250" Dia x 1.250" L) and package specifications (3AB, 3AG). Direct installation in existing holders is supported without modification.

Q: What is the difference between the Littelfuse 313 series variants (HXP, HXIDP, MXP, VXP)?

A: All four Littelfuse variants share identical electrical ratings (7 A, 250 V AC), response time (Slow Blow), breaking capacity (200 A), and DC cold resistance (0.0128 Ohms). The variants differ in internal construction and approval certifications. The MXP variant has the highest inventory availability at 2807 units.

Q: Why does the BK/MDQ-7 show RoHS non-compliance while other Eaton parts are ROHS3 compliant?

A: The BK/MDQ-7 belongs to an earlier product series (MDQ) that predates RoHS3 compliance requirements. The MDL series (including BK/MDL-7-R and MDL-7-R) represents the current compliant generation. Selection between these variants depends on regulatory requirements for your application.

Q: Is the SCHURTER 0034.5243 still available for purchase?

A: The 0034.5243 is marked as obsolete in the product status field. Although 826 units are currently in inventory, this part should not be specified for new designs or applications requiring long-term component availability.

Q: What does "Slow Blow" response time mean for these fuses?

A: Slow Blow (also called time-delay) fuses tolerate temporary current surges without opening the circuit. All substitute parts share this characteristic with the main part, ensuring identical protection behavior in inrush-current applications.

Q: Are there any differences in operating temperature ranges between the main part and substitutes?

A: The main part (BK/MDL-7-R) does not specify an operating temperature range. The Littelfuse 313 series and SCHURTER 0034.5243 specify -55°C to 125°C operating range. The Eaton variants (BK/MDQ-7, MDL-7-R) do not specify operating temperature. All parts are suitable for standard industrial temperature environments.

Q: Which substitute offers the best inventory availability?

A: The Littelfuse 0313007.MXP offers the highest stock level at 2807 units, followed by 0313007.HXIDP at 1233 units and 0313007.HXP at 1128 units. All three are active products with full compliance certifications.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message