Equivalent & Substitute Parts for BK/C518-3-R

Part Overview

The BK/C518-3-R is a 3 A 250 V AC fast-blow glass cartridge fuse manufactured by Eaton - Electronics Division. This through-hole component features a 2AG form factor with dimensions of 5mm x 15mm (axial) and is designed for general-purpose circuit protection applications. The part maintains Active product status with 1146 units in current inventory. Substitute parts are identified to address application requirements including DC voltage ratings, extended operating temperature ranges, and alternative packaging configurations while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Significance for Substitution
Current Rating	3 A	Must match exactly for circuit protection integrity
Voltage Rating - AC	250 V	Must match or exceed for AC applications
Fuse Type	Cartridge, Glass	Determines physical form and response characteristics
Package / Case	2AG, 5mm x 15mm (Axial)	Ensures mechanical fit in through-hole applications
Response Time	Fast Blow	Defines protection speed for sensitive circuits
Mounting Type	Through Hole	Determines PCB assembly compatibility
Breaking Capacity @ Rated Voltage	100 A	Specifies maximum fault current interruption capability

Substitute Part Grouping Explanation

Substitute parts for BK/C518-3-R are classified based on electrical and mechanical parameter alignment:

Direct Substitutes (Littelfuse 224 Series): Parts 0224003.DRT1P, 0224003.HXP, and 0224003.MXP maintain identical current rating (3 A), AC voltage rating (250 V), fuse type (cartridge glass), package form (2AG, 5mm x 15mm), response time (fast blow), and mounting configuration (through hole). These parts additionally provide DC voltage rating (125 V) and extended operating temperature range (-55°C to 125°C), which the main part does not specify. All substitute parts share the same breaking capacity (100 A AC) and RoHS3 compliance status.

Substitution Criteria: Current rating, voltage rating (AC), fuse type, package dimensions, response time, and mounting type are the controlling parameters. Substitute parts that match these parameters are electrically and mechanically compatible regardless of packaging configuration (cut tape versus bulk) or additional DC ratings.

Parameter Comparison

Parameter	BK/C518-3-R (Eaton)	0224003.DRT1P (Littelfuse)	0224003.HXP (Littelfuse)	0224003.MXP (Littelfuse)
Current Rating (Amps)	3 A	3 A	3 A	3 A
Voltage Rating - AC	250 V	250 V	250 V	250 V
Voltage Rating - DC	Not specified	125 V	125 V	125 V
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Response Time	Fast Blow	Fast Blow	Fast Blow	Fast Blow
Package / Case	2AG, 5mm x 15mm	2AG, 5mm x 15mm	2AG, 5mm x 15mm	2AG, 5mm x 15mm
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Breaking Capacity @ Rated Voltage	100 A	100 A AC, 10 kA DC	100 A AC, 10 kA DC	100 A AC, 10 kA DC
Melting I²t	6.1	4.62	4.62	4.62
DC Cold Resistance (Ohms)	0.038	0.0317	0.0317	0.0317
Operating Temperature	Not specified	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Approval Agency	CSA, UL	CE, CSA, PSE, UL	CE, CSA, PSE, UL	CE, CSA, PSE, UL
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging	Bulk	Cut Tape (CT)	Bulk	Bulk
Inventory Status	1146 Pcs	2625 Pcs	3651 Pcs	1785 Pcs

Engineering Selection Recommendations

All three Littelfuse 224 Series parts (0224003.DRT1P, 0224003.HXP, 0224003.MXP) are electrically and mechanically equivalent to BK/C518-3-R for AC applications at 3 A and 250 V. Selection between these substitutes is determined by packaging and inventory requirements:

0224003.DRT1P: Supplied in cut tape packaging, suitable for automated assembly processes requiring tape-and-reel format.

0224003.HXP and 0224003.MXP: Both supplied in bulk packaging, matching the original part's packaging configuration. Selection between these two is based on inventory availability and procurement lead times.

All substitute parts carry CSA and UL certifications matching or exceeding the original part's compliance profile. The Littelfuse parts additionally provide CE and PSE certifications. DC voltage rating (125 V) and extended operating temperature range (-55°C to 125°C) are available in substitute parts but are not required parameters for AC-only applications.

Frequently Asked Questions (FAQ)

Q: Can 0224003.DRT1P, 0224003.HXP, or 0224003.MXP be used as direct replacements for BK/C518-3-R in existing designs?

A: Yes. All three Littelfuse parts match the critical electrical parameters (3 A current rating, 250 V AC voltage rating, fast-blow response) and mechanical specifications (2AG form factor, 5mm x 15mm dimensions, through-hole mounting). They are electrically and mechanically compatible for direct substitution in AC applications.

Q: What is the difference between the three Littelfuse substitute parts?

A: The three parts are electrically identical. The primary difference is packaging: 0224003.DRT1P is supplied in cut tape format for automated assembly, while 0224003.HXP and 0224003.MXP are supplied in bulk. All three share identical electrical characteristics, certifications, and performance specifications.

Q: Do the substitute parts provide additional capabilities compared to BK/C518-3-R?

A: The Littelfuse parts include DC voltage rating (125 V) and specified operating temperature range (-55°C to 125°C), which are not specified for the original part. These additional ratings do not affect AC-only applications but provide expanded capability for designs requiring DC protection or operation in extended temperature environments.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. BK/C518-3-R and all three Littelfuse substitute parts (0224003.DRT1P, 0224003.HXP, 0224003.MXP) are ROHS3 compliant and REACH unaffected.

Q: Which substitute part should be selected for new designs?

A: For new designs, 0224003.HXP or 0224003.MXP are recommended based on bulk packaging alignment with the original part. For automated assembly processes, 0224003.DRT1P in cut tape format is appropriate. All three are functionally equivalent for AC circuit protection at 3 A and 250 V.

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