BK/MDL-10 Equivalent & Substitute Parts

Part Overview

The BK/MDL-10 is a 10 A, 32 V AC/DC slow-blow glass cartridge fuse manufactured by Eaton - Electronics Division. This fuse is designed for use in 3AB and 3AG holders with dimensions of 1/4" x 1-1/4" (6.35mm x 31.75mm). The part is classified as obsolete, which necessitates identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for continued circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	10 A
Voltage Rating (AC)	32 V
Response Time	Slow Blow
Fuse Type	Cartridge, Glass
Package / Case	3AB, 3AG, 1/4" x 1-1/4"
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	1 kA
Size / Dimension	0.250" Dia x 1.250" L (6.35mm x 31.75mm)

Substitute Part Grouping Explanation

Substitution of the BK/MDL-10 is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Substitution Parameters:

Current Rating: 10 A (exact match required)
Voltage Rating (AC): 32 V (exact match required)
Response Time: Slow Blow (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
Mounting Type: Requires Holder (exact match required)

All substitute parts listed maintain these critical parameters. Substitute parts are grouped into two categories:

Direct Manufacturer Substitutes (Eaton - Electronics Division): BK/MDL-10-R and MDL-10-R are active-status variants of the original BK/MDL-10 with identical electrical and mechanical specifications.

Parametric Equivalents (Eaton - Electronics Division): BK/MDQ-10 and MDQ-10 belong to the MDQ series and maintain all critical electrical and mechanical parameters while differing in series designation and DC cold resistance.

Parametric Equivalents (Littelfuse Inc.): The 0313010 series parts (0313010.HXIDP, 0313010.HXP, 0313010.MXP, 0313010.VXIDP, 0313010.VXP) are manufactured by Littelfuse Inc. and maintain all critical electrical and mechanical parameters while offering enhanced breaking capacity and extended operating temperature range.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating (A)	Voltage Rating (V AC)	Response Time	Breaking Capacity @ Rated Voltage	Product Status	RoHS Status	DC Cold Resistance (Ohms)
BK/MDL-10	Eaton	MDL	10	32	Slow Blow	1 kA	Obsolete	Non-compliant	0.008
BK/MDL-10-R	Eaton	MDL	10	32	Slow Blow	1 kA	Active	ROHS3 Compliant	0.01
MDL-10-R	Eaton	MDL	10	32	Slow Blow	1 kA	Active	RoHS Compliant	0.01
BK/MDQ-10	Eaton	MDQ	10	32	Slow Blow	1 kA	Active	Non-compliant	0.0072
MDQ-10	Eaton	MDQ	10	32	Slow Blow	1 kA	Active	Non-compliant	0.0072
0313010.HXIDP	Littelfuse	313	10	32	Slow Blow	300 A	Active	ROHS3 Compliant	0.0083
0313010.HXP	Littelfuse	313	10	32	Slow Blow	300 A	Active	ROHS3 Compliant	0.0083
0313010.MXP	Littelfuse	313	10	32	Slow Blow	300 A	Active	ROHS3 Compliant	0.0083
0313010.VXIDP	Littelfuse	313	10	32	Slow Blow	300 A	Active	ROHS3 Compliant	0.0083
0313010.VXP	Littelfuse	313	10	32	Slow Blow	300 A	Active	ROHS3 Compliant	0.0083

Engineering Selection Recommendations

For Direct Replacement with Active Status: BK/MDL-10-R and MDL-10-R are the primary substitutes for the obsolete BK/MDL-10. Both parts are active-status products manufactured by Eaton - Electronics Division and maintain identical electrical and mechanical specifications. BK/MDL-10-R carries ROHS3 compliance and CE certification in addition to CSA and UL approvals. MDL-10-R carries RoHS compliance with CE, CSA, and UL approvals. Both are suitable for direct substitution in existing circuit designs.

For Enhanced Compliance and Extended Operating Range: The Littelfuse 0313010 series (0313010.HXIDP, 0313010.HXP, 0313010.MXP, 0313010.VXIDP, 0313010.VXP) provides ROHS3 compliance and extended operating temperature range of -55°C to 125°C. These parts maintain all critical electrical and mechanical parameters while offering reduced breaking capacity (300 A versus 1 kA). Selection from this series depends on specific regulatory and environmental requirements.

For Eaton Series Continuity: BK/MDQ-10 and MDQ-10 provide active-status alternatives within the Eaton product line. These MDQ series parts maintain all critical electrical and mechanical specifications and offer lower DC cold resistance (0.0072 Ohms) compared to the original MDL series.

Regulatory Compliance Considerations: Applications requiring RoHS3 compliance should utilize BK/MDL-10-R, MDL-10-R, or any Littelfuse 0313010 series part. Applications with non-compliance requirements may use BK/MDQ-10 or MDQ-10.

Approval Agency Alignment: The original BK/MDL-10 carries CSA and UL approvals. BK/MDL-10-R and MDL-10-R extend approvals to include CE certification. Littelfuse 0313010.VXIDP and 0313010.VXP include CE, CSA, PSE, and UL approvals, providing the broadest regulatory coverage.

Frequently Asked Questions (FAQ)

Q: Can BK/MDL-10-R be used as a direct replacement for BK/MDL-10? A: Yes. BK/MDL-10-R maintains identical electrical and mechanical specifications: 10 A current rating, 32 V AC voltage rating, slow-blow response time, and 3AB/3AG package compatibility. The primary difference is active product status and enhanced RoHS3 compliance.

Q: What is the difference between the MDL and MDQ series? A: Both MDL and MDQ series maintain identical critical electrical and mechanical parameters for the 10 A, 32 V application. The MDQ series exhibits lower DC cold resistance (0.0072 Ohms versus 0.008-0.01 Ohms). Series selection depends on circuit design requirements and supplier availability.

Q: Are Littelfuse 0313010 series parts compatible with 3AB and 3AG holders? A: Yes. All Littelfuse 0313010 series parts maintain the 3AB, 3AG package specification and 1/4" x 1-1/4" physical dimensions, ensuring mechanical compatibility with existing holders.

Q: What is the significance of the breaking capacity difference between Eaton (1 kA) and Littelfuse (300 A) parts? A: Breaking capacity defines the maximum fault current the fuse can safely interrupt. The Littelfuse 0313010 series specifies 300 A breaking capacity, which is lower than the Eaton 1 kA specification. Selection depends on the maximum prospective fault current in the application circuit. Both values are provided in the component specifications and must be evaluated against circuit requirements.

Q: Which substitute part offers the widest operating temperature range? A: Littelfuse 0313010 series parts (0313010.HXIDP, 0313010.HXP, 0313010.MXP, 0313010.VXIDP, 0313010.VXP) operate across -55°C to 125°C. Eaton MDL and MDQ series parts do not specify operating temperature limits in the provided data.

Q: Are all substitute parts RoHS compliant? A: No. BK/MDQ-10 and MDQ-10 are RoHS non-compliant. BK/MDL-10-R, MDL-10-R, and all Littelfuse 0313010 series parts are RoHS3 compliant or RoHS compliant.

Q: What certifications does the original BK/MDL-10 carry? A: The original BK/MDL-10 carries CSA and UL approvals. BK/MDL-10-R adds CE certification. Littelfuse 0313010.VXIDP and 0313010.VXP include CE, CSA, PSE, and UL approvals.

Q: Can I use these fuses interchangeably in the same circuit? A: All listed substitute parts maintain identical current rating (10 A), voltage rating (32 V AC), response time (slow blow), and package specifications (3AB, 3AG, 1/4" x 1-1/4"). Interchangeability is confirmed for these electrical and mechanical parameters. Breaking capacity and operating temperature specifications must be evaluated against specific circuit requirements.

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