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BK/MDL-1 Equivalent & Substitute Parts
Part Overview
The BK/MDL-1 is a 1 A, 250 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 0.250" diameter by 1.250" length (6.35mm x 31.75mm). The BK/MDL-1 carries an obsolete product status, which necessitates identification of active equivalent and substitute parts to maintain circuit protection functionality in applications requiring this fuse specification.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Current Rating | 1 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 | 35 A |
| Mounting Type | Requires Holder |
Substitute Part Grouping Explanation
Substitution of the BK/MDL-1 is determined by strict equivalence across the following critical parameters: current rating (1 A), voltage rating (250 V AC), fuse type (cartridge glass), response time (slow blow), package designation (3AB, 3AG), and physical dimensions (0.250" x 1.250"). All substitute parts listed maintain these core electrical and mechanical specifications, ensuring direct functional compatibility within existing holder assemblies.
Substitute parts are grouped into two categories:
Direct Manufacturer Equivalents (Eaton - Electronics Division): BK/MDL-1-R and MDL-1-R represent active-status alternatives from the original manufacturer with identical electrical characteristics and package specifications.
Parametric Equivalents (Littelfuse Inc. and Eaton - Electronics Division): BK/MDQ-1, 0313001.HXC932P, 0313001.HXIDP, 0313001.HXP, 0313001.MXP, 0313001.VXIDP, and 0313001.VXP meet all core electrical and mechanical parameters while originating from alternative manufacturers or product series.
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 | Eaton | 1 | 250 | Slow Blow | 3AB, 3AG, 1/4" x 1-1/4" | 0.250" x 1.250" | 35 | Obsolete | RoHS non-compliant |
| BK/MDL-1-R | Eaton | 1 | 250 | Slow Blow | 3AB, 3AG, 1/4" x 1-1/4" | 0.250" x 1.250" | 35 | Active | ROHS3 Compliant |
| MDL-1-R | Eaton | 1 | 250 | Slow Blow | 3AB, 3AG, 1/4" x 1-1/4" | 0.250" x 1.250" | 35 | Active | ROHS3 Compliant |
| BK/MDQ-1 | Eaton | 1 | 250 | Slow Blow | 3AB, 3AG, 1/4" x 1-1/4" | 0.250" x 1.250" | 35 | Active | RoHS non-compliant |
| 0313001.HXC932P | Littelfuse | 1 | 250 | Slow Blow | 3AB, 3AG, 1/4" x 1-1/4" | 0.250" x 1.250" | 35 | Active | ROHS3 Compliant |
| 0313001.HXIDP | Littelfuse | 1 | 250 | Slow Blow | 3AB, 3AG, 1/4" x 1-1/4" | 0.250" x 1.250" | 35 | Active | ROHS3 Compliant |
| 0313001.HXP | Littelfuse | 1 | 250 | Slow Blow | 3AB, 3AG, 1/4" x 1-1/4" | 0.250" x 1.250" | 35 | Active | ROHS3 Compliant |
| 0313001.MXP | Littelfuse | 1 | 250 | Slow Blow | 3AB, 3AG, 1/4" x 1-1/4" | 0.250" x 1.250" | 35 | Active | ROHS3 Compliant |
| 0313001.VXIDP | Littelfuse | 1 | 250 | Slow Blow | 3AB, 3AG, 1/4" x 1-1/4" | 0.250" x 1.250" | 35 | Active | ROHS3 Compliant |
| 0313001.VXP | Littelfuse | 1 | 250 | Slow Blow | 3AB, 3AG, 1/4" x 1-1/4" | 0.250" x 1.250" | 35 | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Primary Recommendation: BK/MDL-1-R or MDL-1-R are the preferred substitutes for the obsolete BK/MDL-1. Both parts are manufactured by Eaton - Electronics Division and maintain identical electrical and mechanical specifications. These direct equivalents carry active product status and ROHS3 compliance, providing continuity with the original design intent while meeting current regulatory requirements.
Secondary Recommendation: Littelfuse 0313001.HXP or 0313001.MXP serve as parametric equivalents with active product status and ROHS3 compliance. These parts meet all core electrical and mechanical parameters and carry expanded approval agency certifications (CE, CSA, PSE, UL) compared to the original BK/MDL-1 (CSA, UL).
Compliance Consideration: The original BK/MDL-1 is RoHS non-compliant. Applications subject to RoHS3 requirements must transition to BK/MDL-1-R, MDL-1-R, or Littelfuse equivalents, all of which carry ROHS3 compliance status.
Approval Agency Alignment: The BK/MDL-1 carries CSA and UL approvals. All substitute parts maintain these certifications as minimum requirements. Littelfuse equivalents provide additional PSE and CE certifications.
Frequently Asked Questions (FAQ)
Q: Can BK/MDL-1-R be used as a direct replacement for BK/MDL-1?
A: Yes. BK/MDL-1-R is a direct equivalent manufactured by Eaton - Electronics Division with identical current rating (1 A), voltage rating (250 V AC), response time (slow blow), package designation (3AB, 3AG), and physical dimensions (0.250" x 1.250"). The primary differences are active product status and ROHS3 compliance.
Q: Are Littelfuse 0313001 series fuses compatible with existing 3AB and 3AG holders?
A: Yes. All Littelfuse 0313001 series parts listed (0313001.HXC932P, 0313001.HXIDP, 0313001.HXP, 0313001.MXP, 0313001.VXIDP, 0313001.VXP) maintain the 3AB, 3AG package designation and 0.250" x 1.250" physical dimensions, ensuring mechanical compatibility with existing holder assemblies.
Q: What is the difference between BK/MDL-1-R and MDL-1-R?
A: Both parts are manufactured by Eaton - Electronics Division and are electrically and mechanically identical. The primary difference is packaging: BK/MDL-1-R is supplied in bulk packaging, while MDL-1-R is also supplied in bulk packaging. Both carry active product status and ROHS3 compliance.
Q: Do all substitute parts carry the same approval certifications as the original BK/MDL-1?
A: The original BK/MDL-1 carries CSA and UL approvals. BK/MDL-1-R and MDL-1-R maintain these certifications and add CE approval. Littelfuse equivalents carry CE, CSA, PSE, and UL approvals, providing broader regulatory coverage.
Q: Can BK/MDQ-1 be used as a substitute for BK/MDL-1?
A: Yes. BK/MDQ-1 is a parametric equivalent from Eaton - Electronics Division with identical electrical specifications (1 A, 250 V AC, slow blow) and package designation (3AB, 3AG). It maintains the same physical dimensions and breaking capacity. BK/MDQ-1 carries active product status but is RoHS non-compliant.
Q: What is the significance of the melting I²t value difference between BK/MDL-1 (11.498) and Littelfuse equivalents (14)?
A: The melting I²t value represents the thermal energy required to melt the fuse element. The Littelfuse equivalents have a higher melting I²t value, which is within the acceptable range for 1 A slow-blow fuses and does not affect functional compatibility in applications designed for 1 A, 250 V AC protection.
Q: Are there inventory considerations when selecting a substitute?
A: Inventory levels vary across substitute parts. 0313001.HXP (Littelfuse) has the highest inventory at 12,346 pieces. BK/MDL-1-R (Eaton) has 2,701 pieces available. Specific inventory requirements should be confirmed at the time of procurement.
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