Equivalent & Substitute Parts for BK/C518-375MA

Part Overview

The BK/C518-375MA is a 375 mA, 250 V AC fast-blow glass cartridge fuse in 2AG package format (5mm x 15mm axial). Manufactured by Eaton Electronics Division, this component is classified as obsolete. Due to its obsolete product status, equivalent and substitute parts from active product lines are necessary to maintain circuit protection functionality in applications requiring 375 mA fusing at 250 V AC.

Key Parameters

Parameter	Value
Current Rating	375 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Package / Case	2AG, 5mm x 15mm (Axial)
Response Time	Fast Blow
Mounting Type	Through Hole
Breaking Capacity @ Rated Voltage	35A
Approval Agencies	CSA, UL

Substitute Part Grouping Explanation

Substitution of the obsolete BK/C518-375MA is determined by strict equivalence in the following parameters:

Current Rating: 375 mA (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)

Substitute parts are grouped into two categories:

Category 1: Direct Eaton Equivalents (Active Status) Parts BK/C518-375-R and BK/C518S-375-R maintain identical electrical and mechanical specifications to the main part while offering active product status and improved RoHS compliance.

Category 2: Littelfuse Cross-Functional Equivalents (Active Status) Parts 0224.375DRT1P, 0224.375DRT2P, 0224.375DRT3P, 0224.375HXP, 0224.375MXP, and 0224.375VXP meet all core substitution parameters. These parts provide enhanced DC voltage rating (125 V DC) and extended operating temperature range (-55°C to 125°C) compared to the main part, with packaging variations (Tape & Reel or Bulk).

Parameter Comparison

Part Number	Manufacturer	Current Rating (mA)	Voltage AC (V)	Voltage DC (V)	Package	Response Time	Breaking Capacity (A)	Product Status	RoHS Status
BK/C518-375MA	Eaton	375	250	—	2AG, 5x15mm	Fast Blow	35	Obsolete	Non-compliant
BK/C518-375-R	Eaton	375	250	—	2AG, 5x15mm	Fast Blow	35	Active	Compliant
BK/C518S-375-R	Eaton	375	250	—	2AG, 5x15mm	Fast Blow	35	Active	Compliant
0224.375DRT1P	Littelfuse	375	250	125	2AG, 5x15mm	Fast Blow	35 AC / 10k DC	Active	ROHS3 Compliant
0224.375DRT2P	Littelfuse	375	250	125	2AG, 5x15mm	Fast Blow	35 AC / 10k DC	Active	ROHS3 Compliant
0224.375DRT3P	Littelfuse	375	250	125	2AG, 5x15mm	Fast Blow	35 AC / 10k DC	Active	ROHS3 Compliant
0224.375HXP	Littelfuse	375	250	125	2AG, 5x15mm	Fast Blow	35 AC / 10k DC	Active	ROHS3 Compliant
0224.375MXP	Littelfuse	375	250	125	2AG, 5x15mm	Fast Blow	35 AC / 10k DC	Active	ROHS3 Compliant
0224.375VXP	Littelfuse	375	250	125	2AG, 5x15mm	Fast Blow	35 AC / 10k DC	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement with Identical Specifications:

BK/C518-375-R and BK/C518S-375-R are the primary substitutes for the obsolete BK/C518-375MA. Both parts are manufactured by Eaton Electronics Division and maintain identical electrical and mechanical parameters. Both are active products with RoHS compliance, providing improved regulatory alignment compared to the obsolete main part. BK/C518-375-R is available in bulk packaging, while BK/C518S-375-R is also available in bulk. Selection between these two Eaton variants depends on packaging requirements and inventory availability.

For Enhanced Performance Characteristics:

The Littelfuse 224 series parts (0224.375DRT1P, 0224.375DRT2P, 0224.375DRT3P, 0224.375HXP, 0224.375MXP, 0224.375VXP) provide functional equivalence with additional capabilities. These parts include 125 V DC voltage rating, extended operating temperature range (-55°C to 125°C), and higher DC breaking capacity (10 kA). All Littelfuse variants carry CE, CSA, and UL certifications and are ROHS3 compliant. Packaging options include Tape & Reel (DRT variants) and Bulk (HXP, MXP, VXP variants).

Compliance Considerations:

All substitute parts carry CSA and UL approvals, maintaining the certification profile of the original part. Littelfuse variants add CE certification. The transition from RoHS non-compliant (main part) to RoHS compliant (all substitutes) aligns with current regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can BK/C518-375-R be used as a direct replacement for BK/C518-375MA?

A: Yes. BK/C518-375-R is a direct equivalent with identical current rating (375 mA), voltage rating (250 V AC), package format (2AG, 5mm x 15mm), response time (fast blow), and breaking capacity (35 A). The primary difference is product status (active versus obsolete) and RoHS compliance improvement.

Q: What is the difference between BK/C518-375-R and BK/C518S-375-R?

A: Both parts are electrically and mechanically identical with 375 mA current rating, 250 V AC voltage rating, and 2AG package format. Both are active Eaton products with RoHS compliance. Selection depends on packaging availability and inventory requirements.

Q: Can Littelfuse 0224.375HXP replace BK/C518-375MA?

A: Yes. The 0224.375HXP meets all core substitution parameters: 375 mA current rating, 250 V AC voltage rating, 2AG package format, fast-blow response, and through-hole mounting. The part provides additional DC voltage rating (125 V) and extended operating temperature range (-55°C to 125°C) not present in the original part.

Q: What is the difference between Littelfuse Tape & Reel (DRT) and Bulk (HXP, MXP, VXP) packaging?

A: The electrical and mechanical specifications are identical across all Littelfuse 224 series 375 mA variants. The difference is packaging format: DRT variants (0224.375DRT1P, 0224.375DRT2P, 0224.375DRT3P) are supplied on tape and reel for automated assembly, while HXP, MXP, and VXP variants are supplied in bulk packaging for manual handling or alternative assembly processes.

Q: Are all substitute parts certified to the same standards as the original BK/C518-375MA?

A: All substitute parts carry CSA and UL certifications matching the original part. Littelfuse variants add CE certification. All substitutes are compliant with current RoHS requirements, whereas the original part is RoHS non-compliant.

Q: Can I use a Littelfuse part in an application designed for the Eaton BK/C518-375MA?

A: Yes. All Littelfuse 224 series 375 mA variants are functionally equivalent for AC applications at 250 V. The identical 2AG package format, current rating, voltage rating, and fast-blow response ensure mechanical and electrical compatibility. The enhanced DC voltage rating and operating temperature range of Littelfuse parts provide additional capability without compromising compatibility.

Q: What is the melting I²t difference between Eaton and Littelfuse parts?

A: The Eaton BK/C518-375MA has a melting I²t of 0.039, while Littelfuse 224 series parts have a melting I²t of 0.171. This difference reflects different thermal characteristics but does not prevent substitution, as both meet the 375 mA fast-blow specification and 35 A breaking capacity at 250 V AC.

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