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

Part Overview

The BK1/ABC-5RX-R is a 5 A ceramic cartridge fuse manufactured by Eaton - Electronics Division, rated for 250 V AC and 125 V DC operation. This fast-blow fuse cartridge requires a compatible holder (3AB, 3AG format) and is designed for circuit protection applications requiring rapid response to overcurrent conditions. The part maintains Active product status with 1076 units currently in stock. Substitute parts are identified based on matching electrical ratings, mechanical dimensions, and functional characteristics to ensure direct compatibility in existing fuse holder assemblies.

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"
Size / Dimension	0.250" Dia x 1.250" L (6.35mm x 31.75mm)
Mounting Type	Requires Holder
RoHS Status	ROHS3 Compliant
Approval Agency	CSA, UL

Substitute Part Grouping Explanation

Substitution eligibility for the BK1/ABC-5RX-R is determined by strict equivalence across the following critical parameters:

Primary Substitution 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)
Size / Dimension: 0.250" Dia x 1.250" L (exact match required)
Mounting Type: Requires Holder (exact match required)

All identified substitute parts meet these criteria. Secondary parameters including Breaking Capacity, Melting I²t, DC Cold Resistance, and Approval Agencies may vary within acceptable ranges for the product category but do not disqualify substitution when primary criteria are satisfied.

Parameter Comparison

Parameter	BK1/ABC-5RX-R	ABC-5-R	BK/ABC-5-R	BK/GBB-5-R	0314005.MXP	0332005.HXP
Manufacturer	Eaton	Eaton	Eaton	Eaton	Littelfuse	Littelfuse
Current Rating (A)	5	5	5	5	5	5
Voltage Rating - AC (V)	250	250	250	250	250	250
Voltage Rating - DC (V)	125	125	125	125	125	125
Fuse Type	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic
Response Time	Fast Blow	Fast Blow	Fast Blow	Fast Blow	Fast Blow	Fast Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"
Size / Dimension	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)
Mounting Type	Requires Holder	Requires Holder	Requires Holder	Requires Holder	Requires Holder	Requires Holder
Product Status	Active	Active	Active	Active	Active	Obsolete
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	CSA, UL	CSA, UL	CSA, UL	CSA, UR	CE, CSA, K-MARK, PSE, UL	CE, cULus, PSE
Breaking Capacity @ Rated Voltage	200A AC, 10kA DC	200A AC, 10kA DC	200A AC, 10kA DC	10kA	750A AC, 10kA DC	100A
Melting I²t	32.83	32.83	32.83	32.83	26	6.25
DC Cold Resistance (Ohms)	0.026	0.026	0.026	0.02125	0.03	0.0128
Operating Temperature	Not specified	Not specified	Not specified	Not specified	-55°C ~ 125°C	-55°C ~ 125°C
Inventory (Pcs)	1076	801	1643	943	6627	1153

Engineering Selection Recommendations

Active Status Substitutes (Recommended for New Designs):

ABC-5-R, BK/ABC-5-R, BK/GBB-5-R, and 0314005.MXP all maintain Active product status and are suitable for direct substitution in applications currently using BK1/ABC-5RX-R. These parts satisfy all primary electrical and mechanical criteria.

Eaton Series Substitutes: ABC-5-R and BK/ABC-5-R are Eaton-manufactured alternatives within the ABC series, offering identical electrical specifications and approval certifications (CSA, UL). BK/ABC-5-R provides higher inventory availability (1643 units) compared to the main part.

Cross-Manufacturer Substitute: 0314005.MXP (Littelfuse 314 series) meets all primary substitution criteria and provides expanded approval certifications (CE, CSA, K-MARK, PSE, UL) with significantly higher inventory (6627 units). This part is suitable for applications requiring broader regulatory compliance.

Alternative Series Substitute: BK/GBB-5-R represents the Eaton GBB series with identical electrical ratings. Breaking Capacity specification differs (10kA versus 200A AC, 10kA DC for ABC series), which may affect suitability depending on circuit protection requirements.

Obsolete Status: 0332005.HXP (Littelfuse 332 series) carries Obsolete product status and should not be selected for new designs or long-term supply requirements, despite meeting primary electrical and mechanical criteria.

Frequently Asked Questions (FAQ)

Q: Can ABC-5-R be used as a direct replacement for BK1/ABC-5RX-R?

A: Yes. ABC-5-R meets all primary substitution criteria: 5 A current rating, 250 V AC / 125 V DC voltage ratings, ceramic cartridge fuse type, fast-blow response, and 3AB/3AG package format with 0.250" Dia x 1.250" L dimensions. Both parts are Eaton-manufactured with Active status and identical CSA/UL approvals.

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

A: Both parts are electrically and mechanically identical. The primary difference is packaging: BK/ABC-5-R is supplied in Bulk packaging, while ABC-5-R packaging is not specified. BK/ABC-5-R offers higher current inventory (1643 units versus 801 units).

Q: Is 0314005.MXP (Littelfuse) compatible with existing Eaton fuse holders?

A: Yes. 0314005.MXP is a Littelfuse 314 series ceramic cartridge fuse with identical dimensions (0.250" Dia x 1.250" L) and 3AB/3AG package format. It is mechanically compatible with holders designed for the BK1/ABC-5RX-R and meets all electrical specifications (5 A, 250 V AC, 125 V DC, fast-blow).

Q: Why does 0314005.MXP have different Breaking Capacity and Melting I²t values?

A: Breaking Capacity and Melting I²t are secondary performance characteristics that vary by manufacturer design while maintaining the same primary electrical ratings. These differences do not affect basic substitution compatibility but may influence performance in specific high-fault-current applications. Consult application requirements to determine if these variations are acceptable.

Q: Should 0332005.HXP be used as a substitute?

A: 0332005.HXP carries Obsolete product status and should not be selected for new designs or applications requiring long-term component availability. Although it meets primary electrical and mechanical criteria, its obsolescence status makes it unsuitable for ongoing supply chains.

Q: What are the approval certifications for each substitute?

A: BK1/ABC-5RX-R, ABC-5-R, and BK/ABC-5-R carry CSA and UL approvals. BK/GBB-5-R carries CSA and UR approvals. 0314005.MXP carries CE, CSA, K-MARK, PSE, and UL approvals, providing the broadest regulatory coverage. 0332005.HXP carries CE, cULus, and PSE approvals but is obsolete.

Q: Can these fuses be used in both AC and DC circuits?

A: Yes. All listed parts are rated for both AC and DC operation: 250 V AC and 125 V DC. The fuse holder assembly must be compatible with the intended circuit type.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (ABC-5-R, BK/ABC-5-R, BK/GBB-5-R, 0314005.MXP, and 0332005.HXP) are ROHS3 compliant.

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