BK/C519-3.5-R Equivalent & Substitute Parts

Part Overview

The BK/C519-3.5-R is a 3.5 A, 125 V AC slow blow glass cartridge fuse manufactured by Eaton - Electronics Division. This component is classified as Active product status and is designed for applications requiring overcurrent protection in AC circuits. The fuse operates in a 2AG form factor (5mm x 15mm) and requires a compatible holder for installation. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or application-specific voltage and approval requirements.

Substiute Parts

BK/C519-3.5-R

Eaton - Electronics DivisionIn Stock: 853BK/C519-3.5-R Datasheet

Current PartRFQ

022903.5HXP

Littelfuse Inc.In Stock: 1600022903.5HXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The substitute part 022903.5HXP (Littelfuse Inc., Series 229) qualifies as an equivalent component based on the following substitution criteria:

Matching Parameters:

• Current Rating: 3.5 A (identical)
• Fuse Type: Cartridge, Glass (identical)
• Package / Case: 2AG, 5mm x 15mm (identical mechanical form factor)
• Response Time: Slow Blow (identical protection characteristic)
• Mounting Type: Requires Holder (identical installation requirement)

Enhanced Parameters:

• Voltage Rating - AC: 250 V (exceeds 125 V minimum requirement)
• Voltage Rating - DC: 125 V (additional capability not present in main part)
• Approval Agencies: CE, CSA, PSE, UL (includes UL plus additional certifications)
• RoHS Status: ROHS3 Compliant (enhanced compliance level)

The substitute part maintains electrical and mechanical compatibility while providing higher voltage ratings and broader regulatory approvals. The identical current rating, form factor, and response time ensure functional equivalence in 125 V AC applications.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (BK/C519-3.5-R): Select the Eaton BK/C519-3.5-R when the application is limited to 125 V AC operation and UL certification is the sole regulatory requirement. This part is suitable for standard AC circuit protection applications with established supply availability (827 pcs in stock).

Substitute Selection (022903.5HXP): Select the Littelfuse 022903.5HXP when any of the following conditions apply:

• The application operates at AC voltages up to 250 V
• DC voltage protection capability (125 V DC) is required
• Multi-agency compliance is required (CE, CSA, PSE, UL)
• Enhanced RoHS3 compliance is specified
• Operating temperature range of -55°C to 125°C is required
• Higher inventory availability is needed (1567 pcs in stock)

Both parts maintain Active product status and are suitable for long-term design implementation. The substitute part provides expanded application flexibility without compromising the core 3.5 A protection function.

Frequently Asked Questions (FAQ)

Q: Can the 022903.5HXP be used as a direct replacement for the BK/C519-3.5-R in a 125 V AC circuit?

A: Yes. The 022903.5HXP is mechanically and electrically compatible. Both parts share identical current ratings (3.5 A), fuse type (cartridge glass), package dimensions (2AG, 5mm x 15mm), and response characteristics (slow blow). The substitute part's higher voltage rating (250 V AC) does not prevent operation at 125 V AC.

Q: What is the difference in physical dimensions between these two parts?

A: The BK/C519-3.5-R measures 0.205" diameter x 0.571" length (5.20mm x 14.50mm). The 022903.5HXP measures 0.177" diameter x 0.570" length (4.50mm x 14.48mm). Both conform to the 2AG standard form factor and are compatible with 2AG holders.

Q: Are there voltage limitations when using the substitute part?

A: No voltage limitations exist for the substitute part within its rated specifications. The 022903.5HXP is rated for 250 V AC and 125 V DC, making it suitable for applications ranging from low voltage to its maximum rated voltage. In a 125 V AC application, the part operates well within its voltage capability.

Q: Which part has better regulatory coverage?

A: The 022903.5HXP (Littelfuse) carries approvals from CE, CSA, PSE, and UL, providing broader regulatory coverage than the BK/C519-3.5-R (Eaton), which carries UL approval only. If multi-agency compliance is required, the substitute part is the appropriate selection.

Q: Do these parts have different melting I²t values?

A: Yes. The BK/C519-3.5-R has a melting I²t of 149.279, while the 022903.5HXP has a melting I²t of 110. Both values are within acceptable ranges for 3.5 A slow blow fuses. The difference reflects different manufacturing specifications but does not prevent substitution in standard applications.

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

A: The BK/C519-3.5-R does not specify an operating temperature range. The 022903.5HXP specifies -55°C to 125°C. For applications requiring operation outside standard ambient conditions, the substitute part provides documented temperature performance.

Q: Are both parts RoHS compliant?

A: Yes. The BK/C519-3.5-R is RoHS Compliant. The 022903.5HXP is ROHS3 Compliant, representing an enhanced compliance level. Both parts meet RoHS requirements for hazardous substance restrictions.