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

Part Overview

The BK/ABC-3/4 is a 750 mA ceramic fuse cartridge rated for 250 V AC and 125 V DC operation, manufactured by Eaton - Electronics Division. This component is classified as obsolete, requiring identification of active equivalent alternatives for continued system support and procurement. The part operates as a fast-blow cartridge fuse requiring a compatible holder (3AB, 3AG format, 1/4" x 1-1/4" dimensions). Locating functionally equivalent substitutes ensures design continuity and supply chain reliability for applications currently utilizing this fuse specification.

Substiute Parts

BK/ABC-3/4

Eaton - Electronics DivisionIn Stock: 1233BK/ABC-3/4 Datasheet

Current PartRFQ

ABC-3/4-R

Eaton - Electronics DivisionIn Stock: 946ABC-3/4-R Datasheet

DirectRFQ

BK/ABC-3/4-R

Eaton - Electronics DivisionIn Stock: 1340BK/ABC-3/4-R Datasheet

DirectRFQ

0314.750HXP

Littelfuse Inc.In Stock: 9840314.750HXP Datasheet

Parametric EquivalentRFQ

0314.750MXP

Littelfuse Inc.In Stock: 26360314.750MXP Datasheet

Parametric EquivalentRFQ

0314.750VXP

Littelfuse Inc.In Stock: 11500314.750VXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

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

Mandatory Matching Parameters:

• Current Rating: 750 mA (exact match required)
• Voltage Rating - AC: 250 V (exact match required)
• Voltage Rating - DC: 125 V (exact match required)
• Fuse Type: Cartridge, Ceramic (exact match required)
• Response Time: Fast Blow (exact match required)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
• Size / Dimension: 0.250" Dia x 1.250" L (exact match required)
• Breaking Capacity @ Rated Voltage: 35A AC, 10kA DC (exact match required)

All identified substitute parts meet these mandatory parameters. Variations in secondary characteristics such as melting I²t, DC cold resistance, and RoHS compliance status do not disqualify substitution but are documented for engineering reference. Substitute parts are classified as either direct manufacturer alternatives (same manufacturer, different part number) or parametric equivalents (different manufacturer, identical electrical and mechanical specifications).

Parameter Comparison

Engineering Selection Recommendations

Eaton Direct Alternatives (ABC-3/4-R and BK/ABC-3/4-R):

Both ABC-3/4-R and BK/ABC-3/4-R are active Eaton products providing direct manufacturer substitution for the obsolete BK/ABC-3/4. These parts maintain identical electrical and mechanical specifications while offering ROHS3 compliance. BK/ABC-3/4-R carries higher inventory availability (1248 pcs) compared to ABC-3/4-R (853 pcs). Both parts hold CSA and UL approvals consistent with the original specification. Selection between these two Eaton alternatives depends on procurement lead time and inventory requirements.

Littelfuse Parametric Equivalents (0314.750HXP, 0314.750MXP, 0314.750VXP):

The Littelfuse 314 series fuses (0314.750HXP, 0314.750MXP, 0314.750VXP) provide parametric equivalence across all mandatory electrical and mechanical parameters. These parts offer expanded approval certifications (CE, CSA, UL) and defined operating temperature range (-55°C ~ 125°C). All three Littelfuse variants demonstrate ROHS3 compliance and REACH unaffected status. The 0314.750MXP variant offers the highest inventory level (2573 pcs), supporting extended procurement cycles. Littelfuse alternatives are suitable for applications requiring enhanced environmental specifications or broader regulatory compliance documentation.

Compliance Considerations:

Applications subject to RoHS directives should prioritize ROHS3-compliant alternatives (all substitute options). Systems requiring CE marking documentation benefit from Littelfuse variants. Legacy systems with no specific compliance requirements can utilize any substitute option based on availability and lead time.

Frequently Asked Questions (FAQ)

Q: Can the BK/ABC-3/4 be directly replaced with ABC-3/4-R or BK/ABC-3/4-R?

A: Yes. Both ABC-3/4-R and BK/ABC-3/4-R are direct Eaton manufacturer substitutes meeting identical electrical specifications (750 mA, 250 V AC, 125 V DC) and mechanical dimensions (0.250" Dia x 1.250" L). Both are active products with CSA and UL approvals. Physical installation in existing 3AB/3AG holders is compatible.

Q: What is the difference between Eaton and Littelfuse substitute options?

A: Eaton alternatives (ABC-3/4-R, BK/ABC-3/4-R) maintain the same manufacturer lineage as the original part. Littelfuse alternatives (0314.750HXP, 0314.750MXP, 0314.750VXP) are cross-manufacturer parametric equivalents with identical electrical and mechanical performance. Littelfuse variants include CE certification and specified operating temperature range (-55°C ~ 125°C). All options are ROHS3 compliant and mechanically interchangeable.

Q: Are there differences in melting I²t values between substitutes?

A: Yes. The original BK/ABC-3/4 specifies melting I²t of 0.8. Eaton alternatives (ABC-3/4-R, BK/ABC-3/4-R) specify 0.145, while Littelfuse variants specify 0.466. These variations reflect different thermal response characteristics within the same fast-blow classification. All parts maintain identical breaking capacity (35A AC, 10kA DC) and current rating (750 mA). Melting I²t differences do not affect mechanical interchangeability or basic electrical function in standard applications.

Q: Which substitute offers the best inventory availability?

A: The Littelfuse 0314.750MXP provides the highest inventory level at 2573 pcs. The Eaton BK/ABC-3/4-R offers 1248 pcs. For immediate procurement, the 0314.750MXP supports the shortest lead time.

Q: Can substitutes be used in applications requiring CE marking?

A: Yes. Littelfuse variants (0314.750HXP, 0314.750MXP, 0314.750VXP) carry CE certification. Eaton alternatives (ABC-3/4-R, BK/ABC-3/4-R) hold CSA and UL approvals. For applications requiring CE documentation, Littelfuse options provide direct compliance support.

Q: Are all substitutes RoHS compliant?

A: Yes. All substitute parts (ABC-3/4-R, BK/ABC-3/4-R, 0314.750HXP, 0314.750MXP, 0314.750VXP) are ROHS3 compliant. The original BK/ABC-3/4 is RoHS non-compliant. Substitution automatically upgrades RoHS compliance status.

Q: Do substitutes fit existing fuse holders?

A: Yes. All substitutes maintain the 3AB, 3AG package format and physical dimensions (0.250" Dia x 1.250" L / 6.35mm x 31.75mm). Direct installation in existing 1/4" x 1-1/4" holders is confirmed.