BK/MDL-3/16 Equivalent & Substitute Parts

Part Overview

The BK/MDL-3/16 is a 187 mA, 250 V AC/DC slow-blow glass fuse cartridge in the 3AB/3AG package format with dimensions of 1/4" x 1-1/4" (6.35mm x 31.75mm). This component requires a compatible fuse holder for installation. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for continued circuit protection applications.

Substiute Parts

BK/MDL-3/16

Eaton - Electronics DivisionIn Stock: 1007BK/MDL-3/16 Datasheet

Current PartRFQ

BK/MDL-3/16-R

Eaton - Electronics DivisionIn Stock: 1081BK/MDL-3/16-R Datasheet

DirectRFQ

MDL-3/16-R

Eaton - Electronics DivisionIn Stock: 1133MDL-3/16-R Datasheet

DirectRFQ

BK/MDQ-3/16

Eaton - Electronics DivisionIn Stock: 1046BK/MDQ-3/16 Datasheet

Parametric EquivalentRFQ

0313.187HXP

Littelfuse Inc.In Stock: 7540313.187HXP Datasheet

SimilarRFQ

0313.187MXP

Littelfuse Inc.In Stock: 27330313.187MXP Datasheet

Parametric EquivalentRFQ

0313.187VXP

Littelfuse Inc.In Stock: 8920313.187VXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BK/MDL-3/16 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Compatibility Parameters:

• Current Rating: 187 mA or 188 mA (within tolerance band)
• Voltage Rating (AC): 250 V
• Response Time: Slow Blow
• Fuse Type: Cartridge, Glass
• Package / Case: 3AB, 3AG
• Physical Dimensions: 0.250" Dia x 1.250" L (6.35mm x 31.75mm)
• Breaking Capacity @ Rated Voltage: 35A

Substitute parts are grouped into three categories based on manufacturer and product status:

1. Direct Manufacturer Substitutes (Eaton): BK/MDL-3/16-R and MDL-3/16-R feature 188 mA current rating with active product status and enhanced compliance certifications.

2. Parametric Equivalent (Eaton): BK/MDQ-3/16 maintains the exact 187 mA current rating with identical electrical specifications but differs in series designation and DC cold resistance.

3. Cross-Manufacturer Equivalents (Littelfuse): 0313.187HXP, 0313.187MXP, and 0313.187VXP provide functional equivalence with identical 187 mA rating and enhanced temperature operating range.

All substitute parts maintain the same package format, voltage rating, response time, and breaking capacity as the original component.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement with Enhanced Compliance:

BK/MDL-3/16-R and MDL-3/16-R are the primary substitutes for the obsolete BK/MDL-3/16. Both parts are manufactured by Eaton and maintain identical mechanical and electrical specifications with a 188 mA current rating within the tolerance band of the original 187 mA specification. Both parts hold active product status and carry CE, CSA, and UL certifications. BK/MDL-3/16-R includes ROHS3 compliance with MSL rating of 1 (Unlimited), while MDL-3/16-R carries RoHS compliance. MDL-3/16-R offers the highest inventory availability at 1099 pieces.

For Exact Current Rating Match:

BK/MDQ-3/16 maintains the exact 187 mA current rating and is manufactured by Eaton with active product status. This part carries CSA and UL certifications and is suitable for applications requiring precise current matching. However, this part does not carry RoHS compliance.

For Cross-Manufacturer Equivalence with Extended Temperature Range:

The Littelfuse 313 series parts (0313.187HXP, 0313.187MXP, 0313.187VXP) provide functional equivalence with identical 187 mA current rating and active product status. All three parts carry CE, CSA, and UL certifications with ROHS3 compliance and MSL rating of 1 (Unlimited). These parts feature an extended operating temperature range of -55°C to 125°C compared to the original component. The 0313.187MXP variant offers the highest inventory availability at 2688 pieces.

Frequently Asked Questions (FAQ)

Q: Can BK/MDL-3/16-R be used as a direct replacement for BK/MDL-3/16?

A: Yes. BK/MDL-3/16-R is a direct substitute with identical mechanical and electrical specifications. The current rating difference of 1 mA (188 mA versus 187 mA) falls within standard tolerance bands for fuse cartridges. Both parts use the same 3AB/3AG package format and require identical holder compatibility.

Q: What is the difference between the Eaton MDL series and the Littelfuse 313 series substitutes?

A: Both series maintain identical current rating (187 mA), voltage rating (250 V AC), response time (Slow Blow), and package format (3AB/3AG, 1/4" x 1-1/4"). The primary differences are manufacturer origin and operating temperature range. Littelfuse 313 series parts specify an operating temperature range of -55°C to 125°C, while Eaton parts do not specify an operating temperature range in the provided data. All parts carry equivalent certifications (CE, CSA, UL).

Q: Is the BK/MDQ-3/16 suitable for applications requiring exact 187 mA current rating?

A: Yes. BK/MDQ-3/16 maintains the exact 187 mA current rating and is mechanically and electrically compatible with the original BK/MDL-3/16. This part is appropriate for applications where precise current matching is required. The part carries active product status with CSA and UL certifications.

Q: What are the RoHS compliance differences among substitute parts?

A: BK/MDL-3/16-R, MDL-3/16-R, and all Littelfuse 313 series parts (0313.187HXP, 0313.187MXP, 0313.187VXP) carry RoHS compliance. BK/MDQ-3/16 does not carry RoHS compliance. For applications requiring RoHS-compliant components, select from the compliant options listed above.

Q: Are all substitute parts compatible with existing 3AB/3AG fuse holders?

A: Yes. All substitute parts maintain the identical 3AB/3AG package format and physical dimensions of 0.250" Dia x 1.250" L (6.35mm x 31.75mm). All parts require a compatible fuse holder for installation and are mechanically interchangeable with the original BK/MDL-3/16 in existing holder assemblies.

Q: Which substitute part offers the highest inventory availability?

A: The 0313.187MXP (Littelfuse Inc.) offers the highest inventory availability at 2688 pieces in stock. This part maintains all electrical and mechanical specifications of the original component with active product status and ROHS3 compliance.

Q: Can the 188 mA rated substitutes (BK/MDL-3/16-R and MDL-3/16-R) be used in circuits designed for 187 mA fuses?

A: Yes. The 1 mA difference between 187 mA and 188 mA falls within standard tolerance bands for fuse cartridges and does not affect circuit protection functionality. Both parts maintain identical voltage rating, response time, breaking capacity, and package format as the original component.