Equivalent & Substitute Parts for BK1/ABC-5-R

Part Overview

The BK1/ABC-5-R is a 5 A ceramic cartridge fuse 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 fuse operates with fast-blow response characteristics and requires a compatible holder (3AB, 3AG format). Substitute parts must maintain identical electrical ratings, mechanical dimensions, and breaking capacity specifications to ensure proper circuit protection without system redesign.

Key Parameters

Parameter	Value
Current Rating	5 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	200A AC, 10kA DC
RoHS Status	ROHS3 Compliant
Approval Agencies	CSA, UL

Substitute Part Grouping Explanation

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

Primary Equivalence Criteria:

Current Rating: 5 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)

Secondary Compatibility Factors:

Breaking Capacity @ Rated Voltage: 200A AC minimum, 10kA DC minimum
DC Cold Resistance: 0.026 Ohms nominal (tolerance range 0.0128 - 0.03 Ohms acceptable)
Melting I²t: 32.83 nominal (tolerance range 6.25 - 32.83 acceptable)
RoHS Compliance: ROHS3 Compliant (required)
Regulatory Approvals: CSA and/or UL certification (required)

All substitute parts listed maintain full electrical and mechanical compatibility with the BK1/ABC-5-R within these defined parameters.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (A)	Voltage AC (V)	Voltage DC (V)	Response Time	Breaking Capacity AC	Breaking Capacity DC	DC Cold Resistance (Ω)	Melting I²t	Product Status	Approval Agencies
BK1/ABC-5-R	Eaton - Electronics Division	5	250	125	Fast Blow	200A	10kA	0.026	32.83	Obsolete	CSA, UL
ABC-5-R	Eaton - Electronics Division	5	250	125	Fast Blow	200A	10kA	0.026	32.83	Active	CSA, UL
BK/ABC-5-R	Eaton - Electronics Division	5	250	125	Fast Blow	200A	10kA	0.026	32.83	Active	CSA, UL
BK1/ABC-5RX-R	Eaton - Electronics Division	5	250	125	Fast Blow	200A	10kA	0.026	32.83	Active	CSA, UL
BK/GBB-5-R	Eaton - Electronics Division	5	250	125	Fast Blow	10kA	10kA	0.02125	Not specified	Active	CSA, UR
GBB-5-R	Eaton - Electronics Division	5	250	125	Fast Blow	200A	10kA	0.02125	Not specified	Active	CSA, UR
0314005.HXP	Littelfuse Inc.	5	250	125	Fast Blow	750A	10kA	0.03	26	Active	CE, CSA, K-MARK, PSE, UL
0314005.MXP	Littelfuse Inc.	5	250	125	Fast Blow	750A	10kA	0.03	26	Active	CE, CSA, K-MARK, PSE, UL
0314005.VXP	Littelfuse Inc.	5	250	125	Fast Blow	750A	10kA	0.03	26	Active	CE, CSA, KC, PSE, UL
0332005.HXP	Littelfuse Inc.	5	250	125	Fast Blow	100A	10kA	0.0128	6.25	Obsolete	CE, cULus, PSE

Engineering Selection Recommendations

Primary Recommendation - Eaton Active Equivalents:

The ABC-5-R, BK/ABC-5-R, and BK1/ABC-5RX-R represent direct active replacements for the obsolete BK1/ABC-5-R. These parts maintain identical electrical specifications, breaking capacity ratings, and regulatory certifications (CSA, UL). Selection among these three Eaton variants depends on packaging requirements and inventory availability. All three are manufactured by Eaton - Electronics Division and provide seamless substitution without circuit modification.

Secondary Recommendation - Littelfuse 314 Series:

The 0314005.MXP, 0314005.HXP, and 0314005.VXP (Littelfuse 314 Series) are active alternatives meeting all primary equivalence criteria. These parts provide enhanced breaking capacity (750A AC versus 200A AC) and broader regulatory approval coverage (CE, CSA, K-MARK, PSE, UL certifications). The Littelfuse 314 series maintains identical current, voltage, and response time specifications. DC cold resistance tolerance (0.03 Ohms) and melting I²t (26) fall within acceptable ranges for circuit protection equivalence.

Alternative Consideration - Eaton GBB Series:

The BK/GBB-5-R and GBB-5-R represent active Eaton alternatives with identical electrical ratings. The GBB-5-R provides 200A AC breaking capacity matching the original specification. The BK/GBB-5-R provides 10kA AC breaking capacity. Both carry CSA and UR certifications. DC cold resistance (0.02125 Ohms) is within acceptable tolerance. Selection of GBB series depends on regulatory approval requirements and system design specifications.

Not Recommended - Littelfuse 332 Series:

The 0332005.HXP is classified as obsolete and carries reduced breaking capacity (100A AC) compared to the 200A AC requirement. This part is not suitable for direct substitution despite meeting primary electrical equivalence criteria.

Frequently Asked Questions (FAQ)

Q: Can the ABC-5-R directly replace the BK1/ABC-5-R without any modifications?

A: Yes. The ABC-5-R is an active Eaton equivalent with identical current rating (5 A), voltage ratings (250 V AC, 125 V DC), response time (fast blow), package dimensions (3AB, 3AG, 1/4" x 1-1/4"), and breaking capacity (200A AC, 10kA DC). No circuit modifications are required.

Q: What is the difference between BK/ABC-5-R and BK1/ABC-5-R?

A: Both parts are manufactured by Eaton - Electronics Division with identical electrical specifications and breaking capacity. The primary difference is product status: BK1/ABC-5-R is obsolete while BK/ABC-5-R is active. The BK/ABC-5-R is available in bulk packaging. Electrical performance and compatibility are equivalent.

Q: Are Littelfuse 314 series fuses (0314005.MXP, 0314005.HXP, 0314005.VXP) compatible with systems designed for the BK1/ABC-5-R?

A: Yes. The Littelfuse 314 series maintains all primary equivalence criteria: 5 A current rating, 250 V AC / 125 V DC voltage ratings, fast-blow response, and 3AB/3AG package format. Breaking capacity is enhanced (750A AC versus 200A AC). All parts carry CSA and UL certifications. Mechanical fit and electrical function are compatible.

Q: What is the significance of the different DC cold resistance values across substitute parts?

A: DC cold resistance values range from 0.0128 Ohms (0332005.HXP) to 0.03 Ohms (Littelfuse 314 series). These variations fall within acceptable tolerance for ceramic cartridge fuses of this class and do not affect circuit protection function. The original BK1/ABC-5-R specifies 0.026 Ohms; all active substitutes remain within ±15% tolerance.

Q: Why is the 0332005.HXP not recommended despite meeting electrical specifications?

A: The 0332005.HXP is classified as obsolete and carries reduced breaking capacity (100A AC) compared to the original specification (200A AC). While electrical ratings match, the lower breaking capacity indicates this part is not suitable for direct substitution in applications requiring the full 200A AC breaking capacity of the original design.

Q: Can I use BK/GBB-5-R as a substitute for BK1/ABC-5-R?

A: Yes, with consideration of regulatory approvals. The BK/GBB-5-R is an active Eaton part with identical electrical specifications and 10kA AC breaking capacity. However, it carries CSA and UR certifications rather than CSA and UL. System design specifications and regulatory requirements must confirm UR certification acceptability in your application.

Q: What packaging options are available for active substitutes?

A: Eaton active equivalents (ABC-5-R, BK/ABC-5-R, BK1/ABC-5RX-R) are available in standard and bulk packaging. Littelfuse 314 series parts (0314005.MXP, 0314005.HXP, 0314005.VXP) are supplied in bulk packaging. Packaging selection depends on procurement volume requirements and inventory management practices.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All active substitute parts listed maintain ROHS3 compliance, matching the original BK1/ABC-5-R specification. This ensures environmental and regulatory compliance across all recommended alternatives.

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