Equivalent & Substitute Parts for BK/C518-5-R

Part Overview

The BK/C518-5-R is a 5 A 250 V AC/DC fast-blow glass cartridge fuse manufactured by Eaton - Electronics Division. This through-hole component features a 2AG package format with dimensions of 5mm x 15mm (axial configuration). The part is currently active in production with 783 units in stock. Glass cartridge fuses serve as overcurrent protection devices in electronic circuits and power distribution systems. Identifying equivalent substitute parts is necessary to ensure supply chain continuity, manage inventory across multiple suppliers, and maintain design flexibility in component sourcing.

Substiute Parts

BK/C518-5-R

Eaton - Electronics DivisionIn Stock: 869BK/C518-5-R Datasheet

Current PartRFQ

0224005.MXUP

Littelfuse Inc.In Stock: 20560224005.MXUP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BK/C518-5-R is determined by strict equivalence across the following parameters:

Critical Matching Parameters:

• Current Rating: 5 A (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Package / Case: 2AG, 5mm x 15mm (Axial) (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Fast Blow (exact match required)
• Mounting Type: Through Hole (exact match required)

Secondary Compatibility Parameters:

• Breaking Capacity @ Rated Voltage: Substitute must meet or exceed the main part specification
• Melting I²t: Substitute must be within acceptable tolerance range
• DC Cold Resistance: Substitute must be within acceptable tolerance range
• Approval Agency: Substitute must maintain equivalent regulatory certifications
• RoHS Status: Substitute must maintain equivalent environmental compliance

The substitute part 0224005.MXUP manufactured by Littelfuse Inc. meets all critical matching parameters and maintains equivalent compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The 0224005.MXUP from Littelfuse Inc. is a direct functional substitute for the BK/C518-5-R based on the following engineering criteria:

Compliance & Certification: Both parts maintain ROHS3 compliance and REACH unaffected status. The Littelfuse substitute carries CE certification in addition to CSA and UL approvals, providing equivalent or enhanced regulatory coverage for international applications.

Electrical Equivalence: Both parts are rated for 5 A at 250 V AC/DC with fast-blow response characteristics. DC cold resistance values (0.018 Ohms vs. 0.0186 Ohms) are within acceptable tolerance for circuit performance equivalence.

Mechanical Compatibility: Both parts conform to the 2AG package standard with through-hole mounting. Physical dimensions fall within the 2AG specification tolerance, ensuring mechanical fit in existing PCB designs and component holders.

Performance Considerations: The Littelfuse substitute exhibits lower breaking capacity (100 A vs. 200 A) and lower melting I²t (17 vs. 22.4). These differences indicate faster thermal response in the substitute part. Selection between these parts depends on the specific fault current environment and protection speed requirements of the application circuit.

Inventory & Availability: The Littelfuse substitute maintains higher inventory availability (2000 units vs. 783 units), supporting supply chain continuity and procurement flexibility.

Frequently Asked Questions (FAQ)

Q: Can the 0224005.MXUP be used as a direct replacement for the BK/C518-5-R in existing designs?

A: Yes, for applications where the lower breaking capacity (100 A) and melting I²t (17) of the Littelfuse part are acceptable. Both parts share identical current rating, voltage rating, package format, and response time characteristics. Physical dimensions are within 2AG standard tolerance. Verify that your circuit's maximum fault current does not exceed 100 A.

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

A: Breaking capacity indicates the maximum fault current a fuse can safely interrupt without rupturing or creating a hazard. The Eaton part (200 A) handles higher fault currents than the Littelfuse part (100 A). Select based on your circuit's maximum available fault current at the fuse location.

Q: Are there dimensional differences that affect mechanical fit?

A: Both parts conform to the 2AG standard package. The Littelfuse part measures 4.70mm x 14.48mm versus the Eaton part at 5.50mm x 15.20mm. These variations fall within 2AG specification tolerance and do not affect fit in standard fuse holders or PCB through-hole patterns designed for 2AG cartridges.

Q: Do the regulatory certifications differ between these parts?

A: The Littelfuse part carries CE certification in addition to CSA and UL approvals, while the Eaton part carries CSA and UL approvals. Both maintain equivalent compliance for North American and European markets. The Littelfuse part provides additional CE marking for EU applications.

Q: What does the melting I²t value indicate?

A: Melting I²t characterizes the thermal energy required to melt the fuse element. The Littelfuse part (17) requires less thermal energy than the Eaton part (22.4), resulting in faster response to overcurrent conditions. This difference may affect protection speed in circuits with specific thermal response requirements.

Q: Are both parts RoHS compliant?

A: Yes, both the BK/C518-5-R and 0224005.MXUP are ROHS3 compliant and REACH unaffected, meeting current environmental regulations for electronic component manufacturing and use.