MDL-15-R Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The MDL-15-R is a 15 A, 32 V AC/DC slow blow glass cartridge fuse manufactured by Eaton - Electronics Division. This component is classified as an active product and is designed for use in 3AB and 3AG fuse holders with 1/4" x 1-1/4" dimensions. The fuse provides circuit protection in applications requiring slow blow response characteristics and is approved by CE, CSA, and UL agencies.

Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity while maintaining electrical and mechanical compatibility within the specified parameters.

Key Parameters

Parameter	Value
Current Rating	15 A
Voltage Rating (AC)	32 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)
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	1kA
DC Cold Resistance	0.005 Ohms

Substitute Part Grouping Explanation

Substitution eligibility for the MDL-15-R is determined by the following critical parameters:

Mandatory Matching Parameters:

Current Rating: 15 A
Voltage Rating (AC): 32 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)
Mounting Type: Requires Holder

Acceptable Variation Parameters:

Breaking Capacity @ Rated Voltage: 1kA or higher
DC Cold Resistance: 0.0041 Ohms to 0.005 Ohms
Melting I²t: 354 to 1870
Approval Agencies: CE, CSA, UL (individual certifications may vary)
RoHS Status: Compliant or non-compliant variants acceptable
Operating Temperature: Specified or unspecified

All substitute parts listed maintain electrical and mechanical compatibility with the MDL-15-R within these defined parameters.

Parameter Comparison

Part Number	Manufacturer	Current Rating (A)	Voltage Rating (V AC)	Response Time	Package / Case	Size (Dia x L)	Breaking Capacity @ Rated Voltage	DC Cold Resistance (Ohms)	Melting I²t	Product Status
MDL-15-R	Eaton - Electronics Division	15	32	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250"	1kA	0.005	354	Active
BK/MDL-15-R	Eaton - Electronics Division	15	32	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250"	1kA	0.005	354	Active
MDQ-15	Eaton - Electronics Division	15	32	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250"	1kA	0.0041	Not specified	Active
BK/MDQ-15	Eaton - Electronics Division	15	32	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250"	1kA	0.0041	Not specified	Active
0313015.HXP	Littelfuse Inc.	15	32	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250"	300A	0.005	1870	Active
0313015.MXP	Littelfuse Inc.	15	32	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250"	300A	0.005	1870	Active
0313015.VXP	Littelfuse Inc.	15	32	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250"	300A	0.005	1870	Active

Engineering Selection Recommendations

Direct Manufacturer Equivalent: BK/MDL-15-R is a direct equivalent to MDL-15-R, both manufactured by Eaton - Electronics Division with identical electrical and mechanical specifications. BK/MDL-15-R carries ROHS3 compliance and REACH Unaffected status, providing enhanced regulatory alignment for applications requiring stricter environmental compliance.

Parametric Equivalents (Eaton Series): MDQ-15 and BK/MDQ-15 are parametric equivalents from the Eaton MDQ series. These parts maintain all critical electrical parameters and mechanical compatibility. The MDQ series exhibits lower DC cold resistance (0.0041 Ohms versus 0.005 Ohms), which may be advantageous in low-resistance circuit applications. BK/MDQ-15 provides ROHS3 compliance.

Parametric Equivalents (Littelfuse Series 313): 0313015.HXP, 0313015.MXP, and 0313015.VXP are Littelfuse Series 313 parametric equivalents. These parts provide higher breaking capacity (300A versus 1kA) and elevated melting I²t values (1870 versus 354), offering enhanced protection margins. All three variants carry ROHS3 compliance, REACH Unaffected status, and UL approval with specified operating temperature range (-55°C to 125°C). Selection among these three Littelfuse variants depends on specific application requirements and inventory availability.

Approval Agency Considerations: MDL-15-R carries CE, CSA, and UL approvals. MDQ-15 and BK/MDQ-15 carry CSA and UL approvals (no CE). Littelfuse variants carry UL approval only. Application requirements and regional regulatory mandates determine approval agency suitability.

Frequently Asked Questions (FAQ)

Q: Can MDQ-15 be used as a direct replacement for MDL-15-R? A: Yes. MDQ-15 meets all mandatory electrical and mechanical parameters: 15 A current rating, 32 V AC voltage rating, slow blow response, 3AB/3AG package compatibility, and identical physical dimensions. The lower DC cold resistance (0.0041 Ohms) is within acceptable variation and does not prevent substitution.

Q: What is the difference between BK/MDL-15-R and MDL-15-R? A: Both parts are electrically and mechanically identical. BK/MDL-15-R carries ROHS3 compliance and REACH Unaffected designation, whereas MDL-15-R carries standard RoHS compliance. Selection depends on regulatory requirements for the end application.

Q: Are Littelfuse 0313015 series parts compatible with Eaton MDL and MDQ series fuse holders? A: Yes. All Littelfuse 0313015 variants (HXP, MXP, VXP) share identical package specifications (3AB, 3AG, 1/4" x 1-1/4") and physical dimensions (0.250" Dia x 1.250" L) with Eaton parts, ensuring mechanical compatibility in standard fuse holders.

Q: What is the significance of the higher breaking capacity in Littelfuse parts (300A versus 1kA)? A: Breaking capacity indicates the maximum fault current the fuse can safely interrupt. Littelfuse 0313015 variants with 300A breaking capacity provide adequate protection for applications within this current range. The higher 1kA rating in Eaton parts accommodates higher fault current scenarios. Selection depends on the specific circuit fault current rating.

Q: Do all substitute parts carry the same approval certifications? A: No. MDL-15-R carries CE, CSA, and UL approvals. Eaton MDQ series carries CSA and UL approvals. Littelfuse 0313015 series carries UL approval only. Application requirements and regional standards determine which certifications are necessary.

Q: Can I substitute a Littelfuse part for an Eaton part if CE approval is required? A: No. Littelfuse 0313015 variants carry UL approval only and do not carry CE approval. If CE certification is mandatory for the application, only MDL-15-R or BK/MDL-15-R are suitable substitutes.

Q: What does the melting I²t value indicate? A: Melting I²t is a thermal energy parameter that characterizes fuse response. MDL-15-R and BK/MDL-15-R have melting I²t of 354, while Littelfuse 0313015 variants have 1870. Higher values indicate slower thermal response. Both values are consistent with slow blow classification and do not prevent substitution within the specified parameter ranges.

Q: Are there inventory considerations when selecting a substitute? A: Yes. Current inventory levels are: MDL-15-R (795 units), BK/MDL-15-R (1213 units), MDQ-15 (991 units), BK/MDQ-15 (697 units), 0313015.HXP (1639 units), 0313015.MXP (1840 units), 0313015.VXP (690 units). Availability may influence procurement decisions for time-sensitive applications.

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