Equivalent & Substitute Parts for BK/C520-750MA

Part Overview

The BK/C520-750MA is a 750 mA, 250 V AC fast-blow glass cartridge fuse in 2AG package format (5mm x 15mm) manufactured by Eaton - Electronics Division. This fuse is classified as obsolete, requiring identification of active equivalent alternatives for continued system support and procurement. Substitute parts must maintain identical electrical ratings, mechanical dimensions, and functional characteristics to ensure direct compatibility in existing fuse holder assemblies.

Substiute Parts

BK/C520-750MA

Eaton - Electronics DivisionIn Stock: 1184BK/C520-750MA Datasheet

Current PartRFQ

BK/C520-750-R

Eaton - Electronics DivisionIn Stock: 1145BK/C520-750-R Datasheet

DirectRFQ

0225.750HXP

Littelfuse Inc.In Stock: 12570225.750HXP Datasheet

DirectRFQ

0225.750MXP

Littelfuse Inc.In Stock: 17760225.750MXP Datasheet

DirectRFQ

0225.750VXP

Littelfuse Inc.In Stock: 11430225.750VXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BK/C520-750MA is determined by strict equivalence across the following critical parameters:

Primary Equivalence Criteria:

• Current Rating: 750 mA (exact match required)
• Voltage Rating - AC: 250 V (exact match required)
• Package / Case: 2AG, 5mm x 15mm (mechanical compatibility with existing holders)
• Fuse Type: Cartridge, Glass (functional type match)
• Response Time: Fast Blow (circuit protection characteristic)

Secondary Compatibility Factors:

• Breaking Capacity @ Rated Voltage: 35A minimum
• Mounting Type: Requires Holder (same installation method)
• Approval Agencies: CSA and/or UL certification

The substitute parts listed below satisfy all primary equivalence criteria. Variations in DC voltage rating, melting I²t, and DC cold resistance do not preclude substitution when AC-only operation is specified, as these parameters apply to DC circuit applications not relevant to the main part's AC-rated design.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: BK/C520-750-R

The BK/C520-750-R is the direct equivalent manufactured by Eaton - Electronics Division. This part maintains identical electrical and mechanical specifications to the obsolete BK/C520-750MA while offering active product status. The BK/C520-750-R achieves ROHS3 compliance, addressing environmental regulatory requirements. Both CSA and UL certifications are retained. Selection of this part eliminates supplier transition risk and maintains design continuity within the Eaton C520 series.

Secondary Recommendations: 0225.750HXP, 0225.750MXP, 0225.750VXP

The Littelfuse 225 series fuses (0225.750HXP, 0225.750MXP, 0225.750VXP) provide functional equivalence for AC-rated applications. All three parts meet the primary equivalence criteria: 750 mA current rating, 250 V AC voltage rating, 2AG package format, fast-blow response, and 35A breaking capacity. These parts are active products with ROHS3 compliance and expanded approval certifications including CE marking. The Littelfuse alternatives are suitable when multi-source procurement is required or when Eaton supply becomes unavailable.

Compliance Consideration:

The BK/C520-750MA is RoHS non-compliant. All substitute parts listed above are ROHS3 compliant, satisfying current environmental standards for new procurement and system redesigns.

Frequently Asked Questions (FAQ)

Q: Can the BK/C520-750-R directly replace the BK/C520-750MA in existing assemblies?

A: Yes. The BK/C520-750-R is electrically and mechanically identical to the BK/C520-750MA. Both parts are 750 mA, 250 V AC fast-blow fuses in 2AG package format with 35A breaking capacity. The BK/C520-750-R is compatible with all existing 2AG fuse holders designed for the original part.

Q: What is the difference between the Eaton BK/C520-750-R and the Littelfuse 0225.750HXP?

A: Both parts meet AC circuit protection requirements with identical 750 mA, 250 V AC ratings and 2AG package dimensions. The Littelfuse part includes additional DC voltage rating (125 V DC) and expanded temperature operating range (-55°C to 125°C), features not present in the Eaton part. For AC-only applications, both parts are functionally equivalent. The Littelfuse part offers broader application flexibility if DC circuits are present in the system.

Q: Are the three Littelfuse variants (0225.750HXP, 0225.750MXP, 0225.750VXP) interchangeable?

A: Yes, for AC circuit applications. All three Littelfuse parts share identical electrical ratings (750 mA, 250 V AC), response time (fast-blow), package format (2AG), and breaking capacity (35A AC). The variants differ in internal construction and melting I²t characteristics but are electrically equivalent for the specified 750 mA, 250 V AC circuit protection function.

Q: Does the 2AG package dimension difference between Eaton (5.20mm x 14.48mm) and Littelfuse (4.50mm x 14.48mm) affect compatibility?

A: The diameter difference (5.20mm vs. 4.50mm) does not affect mechanical compatibility. Both parts conform to the 2AG standard package format and are designed to fit standard 2AG fuse holders. The diameter variation is within manufacturing tolerance for the 2AG specification.

Q: What certifications should I verify when selecting a substitute?

A: Verify that the substitute part carries CSA and/or UL certification, matching the approval agencies of the original BK/C520-750MA. All recommended substitute parts listed above meet this requirement. For applications requiring CE marking, the Littelfuse alternatives (0225.750HXP, 0225.750MXP, 0225.750VXP) provide this additional certification.

Q: Is RoHS compliance a factor in selecting a substitute?

A: Yes, for new designs and procurement. The original BK/C520-750MA is RoHS non-compliant. All substitute parts recommended are ROHS3 compliant, satisfying current environmental regulations. For legacy system maintenance where RoHS compliance is not mandated, this factor does not restrict substitution eligibility.