MDL-2-R Equivalent & Substitute Parts Reference

Part Overview

The MDL-2-R is a 2 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 in active product status with full regulatory compliance including CE, CSA, and UL approvals.

Equivalent and substitute parts are necessary when the primary MDL-2-R becomes unavailable, when alternative manufacturers are preferred for supply chain optimization, or when specific compliance certifications are required for particular applications.

Key Parameters

Parameter	Value
Current Rating	2 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	100A
Mounting Type	Requires Holder
RoHS Status	ROHS3 Compliant
Approval Agency	CE, CSA, UL

Substitute Part Grouping Explanation

Substitution of the MDL-2-R is determined by strict equivalence across the following critical parameters:

Primary Equivalence Criteria:

Current Rating: 2 A (exact match required)
Voltage Rating - AC: 250 V (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Slow Blow (exact match required)
Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
Size / Dimension: 0.250" Dia x 1.250" L (exact match required)
Mounting Type: Requires Holder (exact match required)

Secondary Considerations:

Breaking Capacity @ Rated Voltage: 100A minimum
Approval Agencies: CE, CSA, and/or UL certification
RoHS Compliance Status
DC Cold Resistance values
Melting I²t characteristics

Parts are grouped as direct equivalents when all primary criteria match. Parts with identical electrical and mechanical specifications but different manufacturers or series designations are classified as parametric equivalents. Parts with obsolete status or non-compliant RoHS ratings are identified for awareness but remain functionally equivalent.

Parameter Comparison

Part Number	Manufacturer	Series	Current (A)	Voltage AC (V)	Response Time	Package	Breaking Capacity (A)	DC Resistance (Ohms)	Melting I²t	RoHS Status	Product Status	Approvals
MDL-2-R	Eaton	MDL	2	250	Slow Blow	3AB, 3AG	100	0.116	62.3	ROHS3	Active	CE, CSA, UL
BK/MDL-2-R	Eaton	MDL	2	250	Slow Blow	3AB, 3AG	100	0.116	62.3	ROHS3	Active	CE, CSA, UL
BK/MDQ-2	Eaton	MDQ	2	250	Slow Blow	3AB, 3AG	100	0.1325	Not Provided	Non-compliant	Active	CSA, UL
MDQ-2	Eaton	MDQ	2	250	Slow Blow	3AB, 3AG	35	0.1325	Not Provided	Not Applicable	Active	CSA, UL
0034.5231	SCHURTER	FST 6.3x32	2	250	Slow Blow	3AB, 3AG	100	Not Provided	47.1	ROHS3	Obsolete	CSA, UL
0313002.HXP	Littelfuse	313	2	250	Slow Blow	3AB, 3AG	100	0.1169	77	ROHS3	Active	CE, CSA, PSE, UL
0313002.MXP	Littelfuse	313	2	250	Slow Blow	3AB, 3AG	100	0.1169	77	ROHS3	Active	CE, CSA, PSE, UL
0313002.VXP	Littelfuse	313	2	250	Slow Blow	3AB, 3AG	100	0.1169	77	ROHS3	Active	CE, CSA, PSE, UL

Engineering Selection Recommendations

Direct Manufacturer Equivalents (Eaton - Electronics Division):

BK/MDL-2-R is a direct equivalent to MDL-2-R with identical electrical specifications, breaking capacity, and regulatory approvals. Both parts carry ROHS3 compliance and CE, CSA, UL certifications. Selection between these two Eaton variants depends on supply availability and internal part numbering conventions.

Parametric Equivalents (Eaton MDQ Series):

BK/MDQ-2 and MDQ-2 are parametric equivalents from Eaton's MDQ series. Both maintain the 2 A, 250 V AC/DC slow-blow characteristics and 3AB/3AG package compatibility. However, MDQ-2 exhibits a reduced breaking capacity of 35A compared to the 100A specification of MDL-2-R. BK/MDQ-2 maintains 100A breaking capacity but carries RoHS non-compliance status. These parts hold CSA and UL approvals but lack CE certification present in the MDL-2-R.

Cross-Manufacturer Equivalents (SCHURTER and Littelfuse):

0034.5231 (SCHURTER FST 6.3x32) is a parametric equivalent with 100A breaking capacity and ROHS3 compliance. This part is currently in obsolete product status. Selection of this part requires confirmation of long-term availability.

0313002.HXP, 0313002.MXP, and 0313002.VXP (Littelfuse 313 series) are parametric equivalents with identical current, voltage, and package specifications. All three Littelfuse variants maintain 100A breaking capacity, ROHS3 compliance, and expanded regulatory approvals including CE, CSA, PSE, and UL certifications. These parts are in active product status with higher melting I²t values (77 compared to 62.3 for MDL-2-R).

Selection Basis:

For applications requiring full regulatory compliance with CE certification, select MDL-2-R, BK/MDL-2-R, or the Littelfuse 313 series (0313002.HXP, 0313002.MXP, 0313002.VXP). For applications where CE certification is not required, Eaton MDQ series or SCHURTER 0034.5231 provide functional alternatives. Prioritize active product status parts over obsolete designations for new designs and long-term supply assurance.

Frequently Asked Questions (FAQ)

Q: Can MDQ-2 be used as a direct substitute for MDL-2-R?

A: MDQ-2 is not a direct substitute. While both parts share identical current rating (2 A), voltage rating (250 V AC), response time (slow blow), and package format (3AB, 3AG), MDQ-2 has a breaking capacity of 35A compared to MDL-2-R's 100A. Additionally, MDQ-2 lacks CE certification. Use MDQ-2 only in applications where the reduced breaking capacity is acceptable and CE compliance is not required.

Q: Are Littelfuse 313 series fuses (0313002.HXP, 0313002.MXP, 0313002.VXP) fully compatible with MDL-2-R?

A: Yes. All three Littelfuse 313 series parts are parametric equivalents with identical current rating (2 A), voltage rating (250 V AC), response time (slow blow), and package dimensions (0.250" Dia x 1.250" L). All three maintain 100A breaking capacity and ROHS3 compliance. The Littelfuse variants include additional regulatory approvals (PSE) and are in active product status. These parts are suitable for direct substitution in applications requiring CE, CSA, and UL certifications.

Q: Why is 0034.5231 marked as obsolete?

A: 0034.5231 is a SCHURTER FST 6.3x32 series fuse with obsolete product status. Although it meets all electrical and mechanical specifications for substitution (2 A, 250 V AC, slow blow, 100A breaking capacity, ROHS3 compliant), its obsolete designation indicates that SCHURTER has discontinued active production and support. New designs should avoid this part number. Existing inventory may be available but future procurement cannot be assured.

Q: What is the difference between BK/MDL-2-R and MDL-2-R?

A: BK/MDL-2-R and MDL-2-R are both Eaton MDL series fuses with identical electrical specifications, breaking capacity (100A), DC cold resistance (0.116 Ohms), melting I²t (62.3), and regulatory approvals (CE, CSA, UL). Both are ROHS3 compliant and in active product status. The "BK/" prefix typically indicates a specific packaging or distribution variant. Both parts are fully interchangeable.

Q: Can I use a fuse with higher breaking capacity than MDL-2-R?

A: Yes. The MDL-2-R has a 100A breaking capacity. All listed substitutes maintain this specification or exceed it. Higher breaking capacity does not compromise circuit protection; it indicates the fuse can safely interrupt higher fault currents. The critical parameters for substitution are current rating (2 A), voltage rating (250 V AC), response time (slow blow), and package format (3AB, 3AG).

Q: Are there voltage rating differences between MDL-2-R and its substitutes?

A: All listed substitutes maintain the 250 V AC rating of MDL-2-R. One similar part, 0001.2527 (SCHURTER SPT 6.3x32), has a dual voltage rating of 250 V AC and 63 V DC. However, 0001.2527 is classified as a similar part rather than a substitute due to its different series designation and different breaking capacity specifications. Use 0001.2527 only when dual voltage capability is specifically required.

Q: What does the 3AB and 3AG package designation mean?

A: 3AB and 3AG are standardized package format designations for glass cartridge fuses with 1/4" diameter and 1-1/4" length dimensions (6.35mm x 31.75mm). These designations indicate physical compatibility with standard fuse holders designed for this form factor. All listed substitute parts maintain this package compatibility, ensuring mechanical interchangeability in existing fuse holder installations.

Q: Which substitute offers the best long-term availability?

A: Littelfuse 313 series parts (0313002.HXP, 0313002.MXP, 0313002.VXP) and Eaton MDL/MDQ series parts are all in active product status, indicating ongoing production and support. SCHURTER 0034.5231 is obsolete and should not be selected for new applications. For maximum supply assurance, prioritize active status parts from established manufacturers with broad distribution networks.

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