BK/ABC-25 Ceramic Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The BK/ABC-25 is a 25 A ceramic cartridge fuse rated for 250 V AC and 125 V DC operation with fast-blow response characteristics. This component is classified as obsolete, requiring identification of active equivalent alternatives for continued system support and procurement. The fuse is designed for use in 3AB, 3AG holder configurations with dimensions of 0.250" diameter by 1.250" length (6.35mm x 31.75mm). Substitute parts must maintain identical electrical ratings, mechanical form factor, and holder compatibility to ensure direct functional replacement.

Key Parameters

Parameter	Specification
Current Rating	25 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

Substitute Part Grouping Explanation

Substitution eligibility for the BK/ABC-25 is determined by strict equivalence across the following parameters:

Mandatory Matching Parameters:

Current Rating: 25 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

All identified substitute parts meet these mandatory parameters. Substitute parts are grouped into two categories: direct manufacturer equivalents from Eaton - Electronics Division (ABC and GBB series) and parametric equivalents from Littelfuse Inc. (314 series). Both categories provide functional interchangeability within the specified electrical and mechanical constraints.

Parameter Comparison

Part Number	Manufacturer	Series	Current (A)	Voltage AC (V)	Voltage DC (V)	Response Time	Breaking Capacity AC	Breaking Capacity DC	Product Status	RoHS Status
BK/ABC-25	Eaton	ABC	25	250	125	Fast Blow	1 kA	400 A	Obsolete	Non-compliant
ABC-25-R	Eaton	ABC	25	250	125	Fast Blow	200 A	400 A	Active	ROHS3 Compliant
BK/ABC-25-R	Eaton	ABC	25	250	125	Fast Blow	200 A	400 A	Active	ROHS3 Compliant
BK/ABC-25YX	Eaton	ABC	25	250	125	Fast Blow	200 A	400 A	Active	Non-compliant
BK/GBB-25-R	Eaton	GBB	25	250	125	Fast Blow	200 A	Not specified	Active	ROHS3 Compliant
GBB-25-R	Eaton	GBB	25	250	125	Fast Blow	200 A	Not specified	Active	ROHS3 Compliant
0314025.HXP	Littelfuse	314	25	250	125	Fast Blow	100 A	400 A	Active	ROHS3 Compliant
0314025.MX52LP	Littelfuse	314	25	250	125	Fast Blow	100 A	400 A	Active	ROHS3 Compliant
0314025.MXP	Littelfuse	314	25	250	125	Fast Blow	100 A	400 A	Active	ROHS3 Compliant
0314025.VXP	Littelfuse	314	25	250	125	Fast Blow	100 A	400 A	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation - Eaton Active Alternatives:

BK/ABC-25-R and ABC-25-R represent the direct active successors to the obsolete BK/ABC-25. Both parts are manufactured by Eaton - Electronics Division, maintain identical electrical and mechanical specifications, and carry ROHS3 compliance certification. BK/ABC-25-R is preferred for new designs due to REACH Unaffected status and highest current inventory availability (1352 pieces).

Secondary Recommendation - Eaton GBB Series:

BK/GBB-25-R and GBB-25-R provide parametric equivalence with identical current, voltage, and response characteristics. Both are active products with ROHS3 compliance and CSA/UR approval agency certifications. These alternatives are suitable when GBB series standardization is required within system architecture.

Tertiary Recommendation - Littelfuse 314 Series:

The Littelfuse 314 series (0314025.HXP, 0314025.MX52LP, 0314025.MXP, 0314025.VXP) provides parametric equivalence with identical electrical ratings and mechanical form factor. All four variants are active products with ROHS3 compliance. The 314 series carries expanded approval agency certifications (CE, K-MARK, PSE, UL) and operates across -55°C to 125°C temperature range. Selection among these variants depends on specific approval agency requirements and operating temperature environment.

Compliance Considerations:

The original BK/ABC-25 is RoHS non-compliant. All recommended substitutes are ROHS3 compliant, with the exception of BK/ABC-25YX. For applications requiring RoHS compliance, BK/ABC-25YX must be excluded from selection.

Frequently Asked Questions (FAQ)

Q: Can BK/ABC-25-R directly replace the obsolete BK/ABC-25?

A: Yes. BK/ABC-25-R maintains identical current rating (25 A), voltage ratings (250 V AC / 125 V DC), fuse type (ceramic cartridge), response time (fast blow), and mechanical dimensions (0.250" Dia x 1.250" L). Both require the same 3AB/3AG holder configuration. The primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant).

Q: What is the difference between Eaton ABC and GBB series fuses?

A: Both series meet the mandatory electrical and mechanical parameters for substitution. The GBB series carries CSA and UR approval certifications, while the ABC series carries CSA and UL certifications. Selection between series depends on specific approval agency requirements for the application.

Q: Are Littelfuse 314 series fuses compatible with existing 3AB/3AG holders?

A: Yes. Littelfuse 314 series fuses (0314025.HXP, 0314025.MX52LP, 0314025.MXP, 0314025.VXP) maintain the identical 0.250" diameter by 1.250" length mechanical specification and are designed for 3AB/3AG holder compatibility. Physical installation is identical to the original BK/ABC-25.

Q: What approval agencies certify each substitute part?

A: Eaton ABC series (BK/ABC-25-R, ABC-25-R) carry CSA and UL certifications. Eaton GBB series (BK/GBB-25-R, GBB-25-R) carry CSA and UR certifications. Littelfuse 314 series carry CE, K-MARK, PSE, and UL certifications. Application requirements determine which certifications are necessary.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts except BK/ABC-25YX are ROHS3 compliant. The original BK/ABC-25 is RoHS non-compliant. For applications requiring RoHS compliance, select from BK/ABC-25-R, ABC-25-R, BK/GBB-25-R, GBB-25-R, or any Littelfuse 314 series variant.

Q: What is the operating temperature range for each substitute?

A: Eaton ABC and GBB series do not specify operating temperature limits in the provided data. Littelfuse 314 series operates across -55°C to 125°C. Applications requiring operation outside standard ambient conditions should specify Littelfuse 314 series variants.

Q: How do breaking capacity ratings differ among substitutes?

A: The original BK/ABC-25 specifies 1 kA AC and 400 A DC breaking capacity. Eaton active alternatives (ABC-25-R, BK/ABC-25-R, BK/ABC-25YX) specify 200 A AC and 400 A DC. Eaton GBB series specifies 200 A AC with DC breaking capacity not specified. Littelfuse 314 series specifies 100 A AC and 400 A DC. Breaking capacity selection depends on circuit protection requirements.

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