BK/C520-3.5-R Equivalent & Substitute Parts

Part Overview

The BK/C520-3.5-R is a 3.5 A 250 V AC fast-blow glass cartridge fuse manufactured by Eaton - Electronics Division. This fuse is designed for use in 2AG holders and operates at 250 V AC with a breaking capacity of 100 A at rated voltage. The part maintains Active product status with 845 pieces currently in stock. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity for applications requiring 3.5 A 250 V AC fuse cartridges in the 2AG form factor.

Substiute Parts

BK/C520-3.5-R

Eaton - Electronics DivisionIn Stock: 953BK/C520-3.5-R Datasheet

Current PartRFQ

022503.5HXP

LittelfuseIn Stock: 978022503.5HXP Datasheet

DirectRFQ

022503.5MXP

LittelfuseIn Stock: 1764022503.5MXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the BK/C520-3.5-R are identified based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

• Current Rating: 3.5 A (exact match required)
• Voltage Rating - AC: 250 V (exact match required)
• Package / Case: 2AG, 5mm x 15mm (exact match required for holder compatibility)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Fast Blow (exact match required)

The substitute parts 022503.5HXP and 022503.5MXP, both manufactured by Littelfuse, meet all primary substitution criteria. Both parts are rated for 3.5 A at 250 V AC, use the 2AG cartridge form factor, and exhibit fast-blow response characteristics. These parts are functionally equivalent for 250 V AC applications and are mechanically compatible with standard 2AG fuse holders.

Parameter Comparison

Engineering Selection Recommendations

For 250 V AC Applications: The BK/C520-3.5-R, 022503.5HXP, and 022503.5MXP are electrically and mechanically equivalent. All three parts carry CSA and UL approvals, confirming compliance with North American safety standards. Selection among these parts may be based on inventory availability, lead time, or regional certification requirements.

Littelfuse 022503.5HXP and 022503.5MXP: These substitute parts provide additional DC voltage rating (125 V DC) and extended operating temperature range (-55°C ~ 125°C) compared to the main part specification. Both Littelfuse parts carry CE and PSE certifications in addition to CSA and UL approvals, offering broader international compliance. The 022503.5MXP maintains higher inventory availability (1696 pieces) relative to the 022503.5HXP (885 pieces).

Melting I²t Consideration: The substitute parts exhibit a lower melting I²t value (6.7) compared to the main part (9.7). This indicates faster thermal response in the substitute parts. For applications where thermal response characteristics are critical to circuit protection design, this difference must be evaluated against application requirements.

Frequently Asked Questions (FAQ)

Q: Can 022503.5HXP and 022503.5MXP be used interchangeably with BK/C520-3.5-R?

A: Yes, for 250 V AC applications. All three parts share identical current rating (3.5 A), AC voltage rating (250 V), fuse type (cartridge glass), package form factor (2AG, 5mm x 15mm), and response time (fast blow). Mechanical compatibility with standard 2AG fuse holders is confirmed for all three parts.

Q: What is the difference between 022503.5HXP and 022503.5MXP?

A: Both parts are electrically and mechanically identical. The primary difference is inventory availability: 022503.5MXP has 1696 pieces in stock compared to 885 pieces for 022503.5HXP. Both parts carry identical electrical specifications, approvals, and operating parameters.

Q: Do the substitute parts have DC voltage ratings?

A: Yes. Both Littelfuse substitute parts (022503.5HXP and 022503.5MXP) are rated for 125 V DC in addition to 250 V AC. The main part BK/C520-3.5-R does not specify a DC voltage rating. For applications requiring DC protection, the Littelfuse parts provide this additional capability.

Q: Are all three parts RoHS compliant?

A: Yes. BK/C520-3.5-R, 022503.5HXP, and 022503.5MXP are all ROHS3 compliant.

Q: What certifications do these fuses carry?

A: BK/C520-3.5-R carries CSA and UL approvals. Both Littelfuse substitute parts (022503.5HXP and 022503.5MXP) carry CE, CSA, PSE, and UL approvals, providing broader international compliance coverage.

Q: Does the melting I²t difference affect substitution?

A: The substitute parts exhibit lower melting I²t (6.7 versus 9.7), indicating faster thermal response. For applications where thermal response is a specified design parameter, this difference must be evaluated against circuit protection requirements.

Q: Are these fuses suitable for both AC and DC applications?

A: BK/C520-3.5-R is specified for 250 V AC. The Littelfuse substitute parts are rated for both 250 V AC and 125 V DC. Application requirements determine which part is appropriate for specific circuit protection needs.