Equivalent & Substitute Parts for BK/C520-5A

Part Overview

The BK/C520-5A is a 5 A, 250 V AC/DC fast-blow glass cartridge fuse in 2AG package format (5mm x 15mm). This fuse requires a holder for installation and is designed for circuit protection applications requiring fast response characteristics. The part is classified as obsolete, necessitating identification of active equivalent alternatives to maintain supply chain continuity and ensure compliance with current regulatory standards.

Substiute Parts

BK/C520-5A

Eaton - Electronics DivisionIn Stock: 776BK/C520-5A Datasheet

Current PartRFQ

BK/C520-5-R

Eaton - Electronics DivisionIn Stock: 1147BK/C520-5-R Datasheet

DirectRFQ

0225005.VXUP

Littelfuse Inc.In Stock: 9850225005.VXUP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the BK/C520-5A 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)
• Fuse Type: Cartridge, Glass (exact match required)
• Package / Case: 2AG, 5mm x 15mm (exact match required)
• Response Time: Fast Blow (exact match required)
• Mounting Type: Requires Holder (exact match required)

Secondary Consideration Parameters:

• Breaking Capacity @ Rated Voltage
• Melting I²t
• DC Cold Resistance
• Approval Agency certifications
• RoHS compliance status
• Operating temperature range

Two substitute parts meet the primary equivalence criteria and are classified as follows:

Direct Equivalent (Same Manufacturer): BK/C520-5-R (Eaton - Electronics Division) — identical electrical and mechanical specifications with active product status and improved RoHS3 compliance.

Cross-Manufacturer Equivalent: 0225005.VXUP (Littelfuse Inc.) — meets all primary criteria with variations in breaking capacity, melting I²t, and physical dimensions within tolerance.

Parameter Comparison

Engineering Selection Recommendations

BK/C520-5-R (Eaton - Electronics Division) is the primary recommended substitute for BK/C520-5A. This part maintains identical electrical specifications (5 A, 250 V, 200 A breaking capacity, 22.4 melting I²t) and mechanical dimensions. The transition from obsolete to active product status ensures long-term supply availability. RoHS3 compliance status provides regulatory advantage for new designs and procurement cycles. Both parts carry CSA and UL certifications, maintaining equivalent approval agency coverage.

0225005.VXUP (Littelfuse Inc.) serves as a secondary cross-manufacturer substitute. This part satisfies all primary equivalence criteria (5 A, 250 V, fast-blow, 2AG package, holder-required mounting). Differences exist in breaking capacity (100 A versus 200 A) and melting I²t (17 versus 22.4), which may affect performance in high-fault-current applications. Physical diameter is reduced (4.50mm versus 5.20mm), though length remains equivalent. Extended operating temperature range (-55°C ~ 125°C) and CE certification provide additional regulatory coverage. Selection of this substitute requires verification that the reduced breaking capacity and melting I²t are acceptable for the specific circuit protection application.

Frequently Asked Questions (FAQ)

Q: Can BK/C520-5-R be used as a direct replacement for BK/C520-5A?

A: Yes. BK/C520-5-R is electrically and mechanically identical to BK/C520-5A across all critical parameters: 5 A current rating, 250 V voltage rating, fast-blow response, 2AG package format, 200 A breaking capacity, and 22.4 melting I²t. The primary advantage is active product status and RoHS3 compliance.

Q: What are the key differences between BK/C520-5A and 0225005.VXUP?

A: Both parts share identical current rating (5 A), voltage rating (250 V), fuse type (cartridge glass), response time (fast-blow), and package designation (2AG). Differences include: breaking capacity (200 A versus 100 A), melting I²t (22.4 versus 17), physical diameter (5.20mm versus 4.50mm), and operating temperature range (not specified versus -55°C ~ 125°C). The Littelfuse part includes CE certification in addition to CSA and UL.

Q: Will 0225005.VXUP fit in a holder designed for BK/C520-5A?

A: The 0225005.VXUP has a reduced diameter (4.50mm versus 5.20mm). Compatibility with existing holders requires verification of holder specifications. The length dimension (14.48mm) is equivalent. Mechanical fit must be confirmed before deployment.

Q: Are there compliance differences between the substitute parts?

A: BK/C520-5A is RoHS non-compliant. Both BK/C520-5-R and 0225005.VXUP are ROHS3 compliant. For new designs or procurement subject to RoHS regulations, either substitute is acceptable. BK/C520-5-R and BK/C520-5A both carry CSA and UL certifications. 0225005.VXUP adds CE certification to CSA and UL coverage.

Q: Which substitute should be selected for high-fault-current applications?

A: BK/C520-5-R maintains the original breaking capacity of 200 A and melting I²t of 22.4, making it suitable for applications with high fault currents. 0225005.VXUP has reduced breaking capacity (100 A) and melting I²t (17), which may limit performance in high-fault-current scenarios. Application requirements must be evaluated against these specifications.

Q: Is inventory availability a factor in substitute selection?

A: BK/C520-5-R has 1112 pieces in stock. 0225005.VXUP has 882 pieces in stock. Both substitutes have adequate inventory for immediate procurement. BK/C520-5A (671 pieces) is obsolete and should not be selected for new applications.