BK/ABC-V-3/4-R Ceramic Cartridge Fuse - Equivalent & Substitute Parts

Part Overview

The BK/ABC-V-3/4-R is a 750 mA ceramic cartridge fuse manufactured by Eaton - Electronics Division, rated for 250 V AC and 125 V DC operation. This through-hole mounted fuse is designed for fast-blow response applications requiring ceramic construction and 3AB/3AG form factor compatibility. The part maintains active product status with 644 units in current inventory.

Equivalent and substitute parts are identified to support procurement flexibility, supply chain continuity, and design standardization across manufacturing environments where identical electrical and mechanical specifications are required.

Substiute Parts

BK/ABC-V-3/4-R

Eaton - Electronics DivisionIn Stock: 700BK/ABC-V-3/4-R Datasheet

Current PartRFQ

0324.750HXP

Littelfuse Inc.In Stock: 8650324.750HXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the BK/ABC-V-3/4-R is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Requirements:

• Current Rating: 750 mA (exact match required)
• Voltage Rating - AC: 250 V (exact match required)
• Voltage Rating - DC: 125 V (exact match required)
• Response Time: Fast Blow (exact match required)
• Breaking Capacity: 35A AC minimum, 10kA DC minimum

Mechanical Equivalence Requirements:

• Fuse Type: Cartridge, Ceramic (exact match required)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (Axial) form factor (exact match required)
• Mounting Type: Through Hole (exact match required)

Compliance Requirements:

• RoHS3 Compliant status
• Approval by recognized agencies (CSA, UL, or equivalent)

The substitute part 0324.750HXP (Littelfuse Inc., Series 324) meets all critical electrical, mechanical, and compliance parameters and is therefore classified as a direct equivalent.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitution Eligibility:

The Littelfuse 0324.750HXP is a direct equivalent to the Eaton BK/ABC-V-3/4-R based on matching electrical ratings (750 mA, 250 V AC, 125 V DC), identical fuse type (ceramic cartridge), matching package form factor (3AB/3AG, 1/4" x 1-1/4"), and equivalent breaking capacity (35A AC, 10kA DC).

Both parts maintain active product status and comply with ROHS3 requirements. The Littelfuse part carries additional CE certification alongside CSA and UL approvals, providing expanded compliance coverage for international applications.

Dimensional Compatibility:

Physical dimensions vary slightly between manufacturers (diameter: 0.266" vs. 0.275"; length: 1.292" vs. 1.288"). These variations remain within standard manufacturing tolerances for 3AB/3AG form factor cartridge fuses and do not affect through-hole mounting compatibility or electrical performance.

Secondary Parameter Variations:

Melting I²t values (0.145 vs. 0.466) and DC cold resistance (0.3 Ohms vs. 0.25 Ohms) differ between manufacturers. These variations reflect different internal construction methods while maintaining identical fast-blow response characteristics and breaking capacity specifications. Both parts satisfy the same circuit protection requirements.

Inventory and Availability:

Littelfuse 0324.750HXP maintains higher current inventory (845 units) compared to the Eaton part (644 units), supporting supply chain continuity and procurement lead time reduction.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 0324.750HXP be used as a direct replacement for the Eaton BK/ABC-V-3/4-R in existing designs?

A: Yes. Both parts are electrically and mechanically equivalent across all critical parameters: 750 mA current rating, 250 V AC / 125 V DC voltage ratings, ceramic cartridge construction, fast-blow response, 3AB/3AG form factor, and 35A AC / 10kA DC breaking capacity. Through-hole mounting compatibility is maintained.

Q: What is the significance of the different Melting I²t values (0.145 vs. 0.466)?

A: Melting I²t represents the thermal energy required to melt the fuse element. The difference reflects internal construction variations between manufacturers but does not affect the fast-blow response classification or breaking capacity. Both parts provide identical circuit protection performance at the specified 750 mA rating.

Q: Are the dimensional differences between the two parts a concern for PCB layout?

A: No. Diameter variation (0.266" to 0.275") and length variation (1.292" to 1.288") remain within standard manufacturing tolerances for 3AB/3AG cartridge fuses. Both parts fit standard through-hole footprints designed for this form factor without modification.

Q: Does the Littelfuse part's additional CE certification provide any advantage?

A: The Littelfuse 0324.750HXP carries CE, CSA, and UL certifications, while the Eaton part carries CSA and UL certifications. For applications requiring CE compliance (European markets), the Littelfuse part provides direct certification coverage. For CSA/UL-only applications, both parts are equivalent.

Q: How do the DC cold resistance values affect circuit performance?

A: DC cold resistance (0.3 Ohms vs. 0.25 Ohms) represents the fuse element resistance at room temperature. The 0.05 Ohm difference is negligible in typical circuit applications and does not affect protection characteristics or voltage drop at the 750 mA rating.

Q: Can these parts be used interchangeably in the same circuit board assembly?

A: Yes. Electrical equivalence, mechanical compatibility, and matching breaking capacity specifications support direct interchangeability. No circuit redesign or validation testing is required for substitution between these parts.