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

Part Overview

The BK/ABC-3 is a 3 A 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 substitute parts for continued system support. The fast-blow response characteristic and 3AB/3AG holder compatibility define its application scope. Substitute parts must maintain electrical and mechanical compatibility while meeting current regulatory compliance standards.

Key Parameters

Parameter	Value
Current Rating	3 A
Voltage Rating - AC	250 V
Voltage Rating - DC	125 V
Fuse Type	Cartridge, Ceramic
Response Time	Fast Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (6.35mm x 31.75mm)
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	100A AC, 10kA DC
Approval Agency	CSA, UL

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters:

Mandatory Equivalence Criteria:

Current Rating: 3 A (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)
Mounting Type: Requires Holder (exact match required)

Acceptable Variation Parameters:

Breaking Capacity: May vary (100A AC minimum, 10kA DC minimum acceptable)
Melting I²t: May vary within operational tolerance
DC Cold Resistance: Minor variations acceptable (±10% tolerance)
RoHS Status: Active parts preferred (ROHS3 Compliant status preferred over non-compliant)
Product Status: Active status preferred over obsolete

All substitute parts listed meet the mandatory equivalence criteria and are sourced from Eaton - Electronics Division or Littelfuse Inc., both established manufacturers in the fuse component category.

Parameter Comparison

Part Number	Manufacturer	Current (A)	Voltage AC (V)	Voltage DC (V)	Response	Breaking Capacity AC	Breaking Capacity DC	DC Resistance (Ω)	Product Status	RoHS Status
BK/ABC-3	Eaton	3	250	125	Fast Blow	100A	10kA	0.0435	Obsolete	Non-compliant
ABC-3-R	Eaton	3	250	125	Fast Blow	100A	10kA	0.047	Active	ROHS3 Compliant
BK/ABC-3-R	Eaton	3	250	125	Fast Blow	100A	10kA	0.047	Active	ROHS3 Compliant
BK/GBB-3-R	Eaton	3	250	125	Fast Blow	10kA	10kA	0.04475	Active	ROHS3 Compliant
GBB-3-R	Eaton	3	250	125	Fast Blow	200A	10kA	0.04475	Active	ROHS3 Compliant
0314003.HXP	Littelfuse Inc.	3	250	125	Fast Blow	100A	10kA	0.0432	Active	ROHS3 Compliant
0314003.MXP	Littelfuse	3	250	125	Fast Blow	100A	10kA	0.0432	Active	ROHS3 Compliant
0314003.VXP	Littelfuse Inc.	3	250	125	Fast Blow	100A	10kA	0.0432	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Eaton - Electronics Division):

ABC-3-R and BK/ABC-3-R are direct active replacements from the original manufacturer. Both maintain identical electrical specifications (3 A, 250 V AC, 125 V DC, fast-blow response) and mechanical compatibility with 3AB/3AG holders. Both achieve ROHS3 compliance, addressing regulatory requirements absent in the obsolete BK/ABC-3. BK/ABC-3-R offers higher inventory availability (1716 pcs) compared to ABC-3-R (684 pcs).

Secondary Substitutes (Eaton - Electronics Division, GBB Series):

BK/GBB-3-R and GBB-3-R are parametric equivalents from the GBB series. Both maintain all mandatory electrical parameters and mechanical compatibility. GBB-3-R provides enhanced breaking capacity (200A AC versus 100A AC), offering superior fault protection capability. Both achieve ROHS3 compliance and active product status. GBB-3-R inventory (986 pcs) supports sustained availability.

Cross-Manufacturer Substitutes (Littelfuse Inc., 314 Series):

0314003.HXP, 0314003.MXP, and 0314003.VXP are parametric equivalents from Littelfuse Inc. All three maintain identical electrical specifications and mechanical compatibility. All achieve ROHS3 compliance and active product status. Operating temperature range (-55°C ~ 125°C) is specified for Littelfuse parts, providing environmental performance data. 0314003.MXP offers highest inventory (2673 pcs). Littelfuse parts carry expanded approval agencies (CE, CSA, K-MARK, PSE, UL for 0314003.HXP and 0314003.VXP; CE, CSA, K-MARK, PSE, UL for 0314003.MXP).

Selection Priority:

For direct manufacturer continuity: BK/ABC-3-R (highest inventory, active status, ROHS3 compliant).

For enhanced protection capability: GBB-3-R (200A AC breaking capacity, active status, ROHS3 compliant).

For cross-manufacturer sourcing: 0314003.MXP (highest inventory among Littelfuse options, active status, ROHS3 compliant, expanded certifications).

Frequently Asked Questions (FAQ)

Q: Can ABC-3-R directly replace BK/ABC-3 in existing circuits?

A: Yes. ABC-3-R maintains identical electrical ratings (3 A, 250 V AC, 125 V DC), response time (fast-blow), and mechanical compatibility (3AB/3AG holder, 1/4" x 1-1/4" dimensions). The primary difference is product status (active versus obsolete) and RoHS compliance (ROHS3 compliant versus non-compliant).

Q: What is the difference between ABC-3-R and BK/ABC-3-R?

A: Both are electrically and mechanically identical. BK/ABC-3-R offers significantly higher inventory availability (1716 pcs versus 684 pcs) and is the preferred selection for sustained supply.

Q: Can GBB-3-R be used instead of BK/ABC-3?

A: Yes. GBB-3-R maintains all mandatory electrical parameters (3 A, 250 V AC, 125 V DC, fast-blow) and mechanical compatibility (3AB/3AG holder, 1/4" x 1-1/4" dimensions). GBB-3-R provides enhanced breaking capacity (200A AC versus 100A AC), offering improved fault protection without changing circuit behavior under normal operation.

Q: Are Littelfuse 314 series fuses compatible with Eaton ABC series holders?

A: Yes. All Littelfuse 314 series parts (0314003.HXP, 0314003.MXP, 0314003.VXP) maintain identical mechanical specifications (3AB/3AG holder compatibility, 1/4" x 1-1/4" dimensions) and electrical ratings (3 A, 250 V AC, 125 V DC, fast-blow response). Holder compatibility is determined by package dimensions, which are identical across all listed substitutes.

Q: What does "fast-blow" response mean?

A: Fast-blow fuses interrupt circuits rapidly upon overcurrent detection. All listed substitutes maintain this response characteristic, ensuring consistent circuit protection behavior.

Q: Why is RoHS compliance important for this fuse selection?

A: RoHS3 compliance indicates the part meets current regulatory requirements for hazardous substance restrictions. All active substitute parts listed achieve ROHS3 compliance, whereas the obsolete BK/ABC-3 does not. This is relevant for new equipment designs and regulatory compliance documentation.

Q: Can I mix different substitute parts in the same circuit?

A: All listed substitutes are electrically and mechanically equivalent. However, for consistency and traceability, using a single part number throughout a circuit or system is recommended for maintenance and documentation purposes.

Q: What is the significance of DC Cold Resistance values?

A: DC Cold Resistance (ranging from 0.0432 Ω to 0.047 Ω across all parts) represents fuse element resistance at room temperature. Variations within this range do not affect circuit operation under normal conditions. All values are within acceptable tolerance for this component category.

Q: Which substitute offers the best inventory availability?

A: 0314003.HXP (Littelfuse Inc.) offers the highest inventory at 2673 pcs. Among Eaton parts, BK/ABC-3-R provides the highest availability at 1716 pcs.

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