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BK/MDQ-3 Equivalent & Substitute Parts
Part Overview
The BK/MDQ-3 is a 3 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 (6.35 mm × 31.75 mm). The part is currently active in production with 952 pieces in stock.
Substitute parts are necessary when the primary part becomes unavailable, when alternative compliance certifications are required, or when design revisions call for components from different manufacturers or series within the same electrical and mechanical specifications.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Current Rating | 3 A |
| Voltage Rating (AC) | 250 V |
| Fuse Type | Cartridge, Glass |
| Response Time | Slow Blow |
| Package / Case | 3AB, 3AG, 1/4" x 1-1/4" |
| Mounting Type | Requires Holder |
| Physical Dimensions | 0.250" Dia × 1.250" L (6.35 mm × 31.75 mm) |
| Breaking Capacity @ Rated Voltage | 100 A |
Substitute Part Grouping Explanation
Substitution of the BK/MDQ-3 is determined by strict equivalence across the following parameters:
- Current Rating: 3 A (exact match required)
- Voltage Rating: 250 V AC (exact match required)
- Fuse Type: Cartridge, Glass (exact match required)
- Response Time: Slow Blow (exact match required)
- Package / Case: 3AB, 3AG, 1/4" × 1-1/4" (exact match required)
- Mounting Type: Requires Holder (exact match required)
- Physical Dimensions: 0.250" Dia × 1.250" L (exact match required)
All substitute parts listed below meet these core electrical and mechanical parameters. Variations in breaking capacity, DC cold resistance, melting I²t, RoHS compliance status, and approval agencies do not preclude substitution when the above parameters are identical.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Current Rating (A) | Voltage Rating (V AC) | Response Time | Package / Case | Dimensions (Dia × L) | Breaking Capacity @ Rated Voltage (A) | DC Cold Resistance (Ohms) | Approval Agency | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|
| BK/MDQ-3 | Eaton - Electronics Division | 3 | 250 | Slow Blow | 3AB, 3AG, 1/4" × 1-1/4" | 0.250" × 1.250" (6.35 mm × 31.75 mm) | 100 | 0.05715 | CSA, UL | RoHS non-compliant |
| BK/MDL-3-R | Eaton - Electronics Division | 3 | 250 | Slow Blow | 3AB, 3AG, 1/4" × 1-1/4" | 0.250" × 1.250" (6.35 mm × 31.75 mm) | 100 | 0.057 | CE, CSA, UL | ROHS3 Compliant |
| MDL-3-R | Eaton - Electronics Division | 3 | 250 | Slow Blow | 3AB, 3AG, 1/4" × 1-1/4" | 0.250" × 1.250" (6.35 mm × 31.75 mm) | 100 | 0.057 | CE, CSA, UL | RoHS Compliant |
| MDQ-3 | Eaton - Electronics Division | 3 | 250 | Slow Blow | 3AB, 3AG, 1/4" × 1-1/4" | 0.250" × 1.250" (6.35 mm × 31.75 mm) | 35 | 0.05715 | CSA, UL | Not Applicable |
| 0313003.HXIDP | Littelfuse Inc. | 3 | 250 | Slow Blow | 3AB, 3AG, 1/4" × 1-1/4" | 0.250" × 1.250" (6.35 mm × 31.75 mm) | 100 | 0.0593 | CE, CSA, K-MARK, PSE, UL | ROHS3 Compliant |
| 0313003.HXP | Littelfuse | 3 | 250 | Slow Blow | 3AB, 3AG, 1/4" × 1-1/4" | 0.250" × 1.250" (6.35 mm × 31.75 mm) | 100 | 0.0593 | CE, CSA, K-MARK, PSE, UL | ROHS3 Compliant |
| 0313003.MXP | Littelfuse Inc. | 3 | 250 | Slow Blow | 3AB, 3AG, 1/4" × 1-1/4" | 0.250" × 1.250" (6.35 mm × 31.75 mm) | 100 | 0.0593 | CE, CSA, K-MARK, PSE, UL | ROHS3 Compliant |
| 0313003.VXP | Littelfuse | 3 | 250 | Slow Blow | 3AB, 3AG, 1/4" × 1-1/4" | 0.250" × 1.250" (6.35 mm × 31.75 mm) | 100 | 0.0593 | CE, CSA, K-MARK, PSE, UL | ROHS3 Compliant |
Engineering Selection Recommendations
All listed substitute parts are electrically and mechanically equivalent to the BK/MDQ-3 and are suitable for direct replacement in applications requiring a 3 A, 250 V AC/DC slow-blow glass cartridge fuse in a 3AB/3AG holder.
Eaton - Electronics Division Substitutes:
-
BK/MDL-3-R and MDL-3-R: These parts maintain the same electrical specifications as the BK/MDQ-3 while offering RoHS3 compliance and expanded approval certifications (CE, CSA, UL). Both are active products with higher inventory availability (1879 and 877 pieces respectively).
-
MDQ-3: This part is from the same MDQ series as the main part and shares identical electrical characteristics. However, it has a lower breaking capacity of 35 A compared to the BK/MDQ-3's 100 A. This part remains suitable for applications where the lower breaking capacity is acceptable.
Littelfuse Inc. Substitutes:
- 0313003.HXIDP, 0313003.HXP, 0313003.MXP, and 0313003.VXP: All Littelfuse 313 series parts meet the core electrical and mechanical requirements. These parts offer RoHS3 compliance, expanded approval certifications (CE, CSA, K-MARK, PSE, UL), and an operating temperature range of -55°C to 125°C. The 0313003.HXP variant has the highest inventory availability at 3458 pieces.
Selection among substitutes should be based on availability, required compliance certifications, and approval agency requirements for the target application.
Frequently Asked Questions (FAQ)
Q: Can the BK/MDQ-3 be replaced with any of the listed substitute parts?
A: Yes. All listed substitute parts are electrically and mechanically equivalent. They share identical current rating (3 A), voltage rating (250 V AC), fuse type (cartridge, glass), response time (slow blow), package designation (3AB, 3AG), and physical dimensions (0.250" × 1.250"). Direct substitution is permissible from an electrical and mechanical standpoint.
Q: What is the difference between the BK/MDQ-3 and MDQ-3?
A: Both parts are from Eaton's MDQ series and share identical electrical specifications. The primary difference is the breaking capacity: BK/MDQ-3 has 100 A breaking capacity, while MDQ-3 has 35 A breaking capacity. Both are suitable substitutes depending on application requirements.
Q: Are the Littelfuse 313 series parts (0313003.HXP, 0313003.MXP, 0313003.VXP, 0313003.HXIDP) interchangeable with the Eaton parts?
A: Yes. All Littelfuse 313 series parts listed meet the same electrical and mechanical specifications as the BK/MDQ-3. They are cross-manufacturer equivalents suitable for direct replacement.
Q: What is the significance of RoHS compliance in selecting a substitute?
A: RoHS compliance is a regulatory requirement in certain markets and applications. The BK/MDQ-3 is RoHS non-compliant, while BK/MDL-3-R, MDL-3-R, and all Littelfuse parts are RoHS3 compliant. Selection should align with the regulatory requirements of the target application and end market.
Q: Do all substitute parts fit in the same holder?
A: Yes. All substitute parts are designed for 3AB and 3AG holders and have identical physical dimensions of 0.250" diameter by 1.250" length. They are mechanically interchangeable.
Q: What approval agencies certify these fuses?
A: The BK/MDQ-3 carries CSA and UL approvals. Substitute parts from Eaton (BK/MDL-3-R, MDL-3-R) add CE certification. Littelfuse parts carry CE, CSA, K-MARK, PSE, and UL certifications. Selection should be based on the approval agencies required for the target application.
Q: Is there a difference in DC cold resistance among the substitute parts?
A: Minor variations exist. The BK/MDQ-3 and MDQ-3 have 0.05715 Ohms, BK/MDL-3-R and MDL-3-R have 0.057 Ohms, and Littelfuse parts have 0.0593 Ohms. These variations are within acceptable tolerances for slow-blow fuse applications and do not affect substitutability.
Q: Which substitute part has the best inventory availability?
A: The Littelfuse 0313003.HXP has the highest inventory availability at 3458 pieces in stock, followed by 0313003.MXP at 2400 pieces.
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