BK/C519-2.5A Equivalent & Substitute Parts

Part Overview

The BK/C519-2.5A is a 2.5 A 250 V AC DC fuse cartridge manufactured by Eaton - Electronics Division. This glass cartridge fuse operates at slow blow response time and requires a 2AG holder for installation. The part is classified as obsolete, necessitating identification of active equivalent and substitute components for continued system support and procurement.

Key Parameters

Parameter	Value
Current Rating	2.5 A
Voltage Rating - AC	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	2AG, 5mm x 15mm
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	100A
DC Cold Resistance	0.046 Ohms
Approval Agency	CSA, UL

Substitute Part Grouping Explanation

Substitute parts for the BK/C519-2.5A are classified based on the following critical parameters that determine functional equivalence:

Primary Equivalence Criteria:

Current Rating: 2.5 A (exact match required)
Voltage Rating - AC: 250 V (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Slow Blow (exact match required)
Package / Case: 2AG, 5mm x 15mm (exact match required)
Mounting Type: Requires Holder (exact match required)

Direct Manufacturer Equivalents (Eaton - Electronics Division):

BK/C519-2.5-R: Active status replacement with identical electrical and mechanical specifications
BK1/C519-2.5-R: Active status parametric equivalent with identical electrical and mechanical specifications

Similar Manufacturer Alternatives (Littelfuse Inc.):

022902.5HXP, 022902.5MXP, 022902.5VXP: Active status alternatives with matching primary parameters but differing in breaking capacity and DC voltage rating specifications

Parameter Comparison

Parameter	BK/C519-2.5A	BK/C519-2.5-R	BK1/C519-2.5-R	022902.5HXP	022902.5MXP	022902.5VXP
Manufacturer	Eaton	Eaton	Eaton	Littelfuse	Littelfuse	Littelfuse
Current Rating (Amps)	2.5 A	2.5 A	2.5 A	2.5 A	2.5 A	2.5 A
Voltage Rating - AC	250 V	250 V	250 V	250 V	250 V	250 V
Voltage Rating - DC	Not specified	Not specified	Not specified	125 V	125 V	125 V
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow Blow	Slow Blow	Slow Blow
Package / Case	2AG, 5mm x 15mm	2AG, 5mm x 15mm	2AG, 5mm x 15mm	2AG, 5mm x 15mm	2AG, 5mm x 15mm	2AG, 5mm x 15mm
Breaking Capacity @ Rated Voltage	100A	100A	100A	35A AC, 10kA DC	35A AC, 10kA DC	100A AC, 10kA DC
DC Cold Resistance (Ohms)	0.046	0.046	0.046	0.0502	0.0502	0.0502
Melting I²t	78.163	78.163	78.163	50	50	50
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	CSA, UL	CSA, UL	CSA, UL	CE, CSA, PSE, UL	CE, CSA, PSE, UL	CE, CSA, PSE, UL
Operating Temperature	Not specified	Not specified	Not specified	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C

Engineering Selection Recommendations

Primary Recommendation - Direct Eaton Equivalents:

BK/C519-2.5-R and BK1/C519-2.5-R are the preferred substitutes for the obsolete BK/C519-2.5A. Both parts maintain identical electrical and mechanical specifications, including current rating, voltage rating, breaking capacity, and DC cold resistance. Both are active status components with current manufacturing support. BK/C519-2.5-R carries ROHS3 compliance, while BK1/C519-2.5-R carries RoHS compliance. Both retain CSA and UL approvals consistent with the original part.

Secondary Recommendation - Littelfuse Alternatives:

The Littelfuse 229 series components (022902.5HXP, 022902.5MXP, 022902.5VXP) provide functional alternatives when Eaton equivalents are unavailable. These parts match the primary electrical parameters (2.5 A, 250 V AC, slow blow response, 2AG package) and are active status components with ROHS3 compliance and expanded approval certifications (CE, CSA, PSE, UL).

Compatibility Considerations:

The Littelfuse alternatives exhibit lower melting I²t values (50 versus 78.163) and different breaking capacity specifications. The 022902.5HXP and 022902.5MXP provide 35A AC breaking capacity, while 022902.5VXP provides 100A AC breaking capacity matching the original specification. All Littelfuse alternatives include 125 V DC rating, providing enhanced DC application capability. Physical dimensions differ slightly (4.50mm diameter versus 5.20mm for Eaton parts), though all conform to 2AG package standards.

Frequently Asked Questions (FAQ)

Q: Can BK/C519-2.5-R directly replace the obsolete BK/C519-2.5A?

A: Yes. BK/C519-2.5-R is an active status direct equivalent with identical current rating (2.5 A), voltage rating (250 V AC), fuse type (cartridge glass), response time (slow blow), package specification (2AG, 5mm x 15mm), and breaking capacity (100A). The part maintains CSA and UL approvals and is suitable for direct substitution in existing 2AG fuse holders.

Q: What is the difference between BK/C519-2.5-R and BK1/C519-2.5-R?

A: Both parts are parametric equivalents with identical electrical and mechanical specifications. The primary difference is RoHS compliance status: BK/C519-2.5-R carries ROHS3 compliance, while BK1/C519-2.5-R carries RoHS compliance. Both are active status components suitable for direct substitution.

Q: Are Littelfuse 022902.5 series fuses compatible with existing Eaton BK/C519 holders?

A: The Littelfuse 229 series components conform to 2AG package standards and are mechanically compatible with standard 2AG fuse holders. However, physical dimensions differ slightly (4.50mm diameter versus 5.20mm for Eaton parts). Verify holder specifications before installation. All three Littelfuse alternatives (022902.5HXP, 022902.5MXP, 022902.5VXP) are mechanically and electrically compatible with 2AG holders.

Q: What is the significance of the different breaking capacity ratings among substitute parts?

A: Breaking capacity indicates the maximum current the fuse can safely interrupt at rated voltage. The original BK/C519-2.5A and Eaton equivalents provide 100A breaking capacity. Littelfuse 022902.5HXP and 022902.5MXP provide 35A AC breaking capacity, while 022902.5VXP provides 100A AC breaking capacity. Select based on circuit protection requirements and system specifications.

Q: Why do Littelfuse alternatives include DC voltage ratings when the original part does not?

A: The Littelfuse 229 series components are rated for both AC and DC applications (250 V AC, 125 V DC), providing broader application flexibility. The original BK/C519-2.5A specification does not include a DC rating. For AC-only applications, both Eaton and Littelfuse alternatives are suitable. For DC applications, Littelfuse alternatives provide explicit DC rating specifications.

Q: What is the impact of different melting I²t values on fuse selection?

A: Melting I²t represents the thermal energy required to melt the fuse element. The original BK/C519-2.5A and Eaton equivalents specify 78.163, while Littelfuse alternatives specify 50. Lower I²t values indicate faster thermal response. For applications requiring specific thermal characteristics, verify that substitute part I²t values align with circuit protection requirements.

Q: Are all substitute parts RoHS compliant?

A: The original BK/C519-2.5A is RoHS non-compliant. Both Eaton equivalents (BK/C519-2.5-R and BK1/C519-2.5-R) are RoHS compliant. All three Littelfuse alternatives (022902.5HXP, 022902.5MXP, 022902.5VXP) are ROHS3 compliant. For applications requiring RoHS compliance, all substitute parts meet this requirement.

Q: Which substitute part should be selected for new designs?

A: For new designs requiring Eaton components, select BK/C519-2.5-R (active status, ROHS3 compliant). For applications allowing alternative manufacturers, 022902.5VXP provides matching 100A breaking capacity with expanded certifications (CE, CSA, PSE, UL) and ROHS3 compliance. Both options are active status components with current manufacturing support.

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