Equivalent & Substitute Parts for BK/MDL-1-1/2

Part Overview

The BK/MDL-1-1/2 is a 1.5 A, 250 V AC/DC glass cartridge fuse manufactured by Eaton - Electronics Division. This component is classified as obsolete and requires a fuse holder for installation. The fuse operates with slow-blow response characteristics and is housed in a 3AB, 3AG package format with dimensions of 0.250" diameter by 1.250" length (6.35mm x 31.75mm).

Due to the obsolete product status of the BK/MDL-1-1/2, identification of equivalent and substitute parts is necessary to maintain circuit protection functionality in applications where this fuse is currently deployed. Active production alternatives with identical electrical and mechanical specifications are available from multiple manufacturers.

Key Parameters

Parameter	Value
Current Rating	1.5 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

Substitute Part Grouping Explanation

Substitution of the BK/MDL-1-1/2 is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Substitution Parameters:

Current Rating: 1.5 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)
Mounting Type: Requires Holder

All substitute parts listed in this document meet these critical parameters. Substitute parts are grouped into two categories:

Direct Manufacturer Substitutes (Eaton - Electronics Division): Parts BK/MDL-1-1/2-R and MDL-1-1/2-R are direct alternatives from the original manufacturer with active product status.

Parametric Equivalents (Alternative Manufacturers): Parts from Littelfuse Inc. (031301.5HXP, 031301.5HXP, 031301.5MXP, 031301.5VXIDP, 031301.5VXP) and SCHURTER Inc. (0034.5228) provide electrical and mechanical equivalence while offering enhanced compliance certifications and active production status.

Parameter Comparison

Part Number	Manufacturer	Current Rating (A)	Voltage Rating (V AC)	Response Time	Package / Case	Size (Dia x L)	Breaking Capacity (A)	Product Status	RoHS Status
BK/MDL-1-1/2	Eaton	1.5	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250"	100	Obsolete	Non-compliant
BK/MDL-1-1/2-R	Eaton	1.5	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250"	100	Active	ROHS3 Compliant
MDL-1-1/2-R	Eaton	1.5	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250"	100	Active	RoHS Compliant
BK/MDQ-1-1/2	Eaton	1.5	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250"	100	Active	Non-compliant
MDQ-1-1/2	Eaton	1.5	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250"	35	Active	Not Applicable
0034.5228	SCHURTER Inc.	1.5	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250"	100	Obsolete	ROHS3 Compliant
031301.5HXIDP	Littelfuse Inc.	1.5	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250"	100	Active	ROHS3 Compliant
031301.5HXP	Littelfuse Inc.	1.5	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250"	100	Active	ROHS3 Compliant
031301.5MXP	Littelfuse Inc.	1.5	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250"	100	Active	ROHS3 Compliant
031301.5VXIDP	Littelfuse Inc.	1.5	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250"	100	Active	ROHS3 Compliant
031301.5VXP	Littelfuse Inc.	1.5	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250"	100	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: BK/MDL-1-1/2-R

The BK/MDL-1-1/2-R is the direct successor from Eaton - Electronics Division. This part maintains identical electrical and mechanical specifications to the obsolete BK/MDL-1-1/2 while offering active product status and ROHS3 compliance. Approval agencies include CE, CSA, and UL. This selection eliminates supply chain risk associated with obsolete components.

Secondary Recommendation: MDL-1-1/2-R

The MDL-1-1/2-R provides equivalent functionality with active product status and RoHS compliance. Approval agencies include CE, CSA, and UL. This part is suitable for applications requiring RoHS-compliant alternatives from the original manufacturer.

Alternative Manufacturers: Littelfuse Inc. Series 313

The Littelfuse 031301.5HXP, 031301.5MXP, 031301.5VXIDP, and 031301.5VXP parts provide parametric equivalence with enhanced compliance certifications (CE, CSA, PSE, UL) and active production status. All Littelfuse alternatives are ROHS3 compliant. The 031301.5MXP offers the highest inventory availability (4300 pieces).

Alternative Manufacturer: SCHURTER Inc.

The 0034.5228 provides parametric equivalence with ROHS3 compliance and CSA/UL approvals. This part is classified as obsolete but remains available in inventory.

Note on MDQ Series:

The BK/MDQ-1-1/2 and MDQ-1-1/2 are parametric equivalents with active product status. However, MDQ-1-1/2 exhibits a reduced breaking capacity of 35A compared to the 100A specification of the original part. Selection of MDQ series parts requires verification that the reduced breaking capacity is acceptable for the target application.

Frequently Asked Questions (FAQ)

Q: Can the BK/MDL-1-1/2-R be used as a direct replacement for the BK/MDL-1-1/2?

A: Yes. The BK/MDL-1-1/2-R is the direct successor with identical current rating (1.5 A), voltage rating (250 V AC), fuse type (cartridge glass), response time (slow blow), package format (3AB, 3AG), and physical dimensions (0.250" x 1.250"). Both parts require the same fuse holder and provide 100A breaking capacity.

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

A: Both series provide 1.5 A, 250 V AC/DC slow-blow glass cartridge fuses in 3AB, 3AG package format. The primary difference is breaking capacity: MDL series provides 100A breaking capacity, while MDQ series provides 35A breaking capacity. Selection depends on application requirements.

Q: Are Littelfuse 031301.5 series parts compatible with existing Eaton fuse holders?

A: Yes. All substitute parts listed maintain identical package specifications (3AB, 3AG, 1/4" x 1-1/4") and physical dimensions (0.250" diameter x 1.250" length). Compatibility with existing fuse holders is assured based on mechanical parameters.

Q: What is the significance of RoHS compliance in fuse selection?

A: RoHS compliance indicates the part meets restrictions on hazardous substances. ROHS3-compliant parts (BK/MDL-1-1/2-R, 0034.5228, and all Littelfuse 031301.5 variants) are suitable for applications subject to RoHS regulations. The original BK/MDL-1-1/2 is RoHS non-compliant.

Q: Which substitute part has the highest inventory availability?

A: The Littelfuse 031301.5MXP offers the highest inventory availability with 4300 pieces in stock. This part is ROHS3 compliant, active in production, and provides 100A breaking capacity.

Q: Do all substitute parts carry the same approval certifications?

A: No. The original BK/MDL-1-1/2 carries CSA and UL approvals. Direct Eaton successors (BK/MDL-1-1/2-R and MDL-1-1/2-R) add CE certification. Littelfuse alternatives add PSE certification in addition to CE, CSA, and UL. SCHURTER 0034.5228 carries CSA and UL approvals. Selection should consider application-specific certification requirements.

Q: Can the BK/MDQ-1-1/2 be used in place of the BK/MDL-1-1/2?

A: Electrical and mechanical compatibility is confirmed. However, the BK/MDQ-1-1/2 provides 100A breaking capacity identical to the original part. The MDQ-1-1/2 variant provides only 35A breaking capacity and is not recommended as a direct replacement without application verification.

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

A: The original BK/MDL-1-1/2 does not specify an operating temperature range. Littelfuse alternatives (031301.5 series) and SCHURTER 0034.5228 operate across -55°C to 125°C. Eaton MDL and MDQ series do not specify operating temperature ranges in the provided data.

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