Littelfuse 02302.25DRT2SW Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 02302.25DRT2SW is a 2.25 A, 250 V AC glass cartridge fuse with slow-blow response characteristics, designed for through-hole mounting in axial configuration. This part is classified as obsolete. Equivalent and substitute parts are available from the same manufacturer series with active product status and enhanced compliance certifications, providing direct functional replacement capability while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Manufacturer	Littelfuse Inc.
Series	230
Current Rating	2.25 A
Voltage Rating (AC)	250 V
Response Time	Slow Blow
Fuse Type	Cartridge, Glass
Mounting Type	Through Hole
Package / Case	Cartridge, Non-Standard (Axial)
Size / Dimension	0.177" Dia x 0.571" L (4.50mm x 14.50mm)
Melting I²t	39
Operating Temperature Range	-55°C ~ 125°C

Substitute Part Grouping Explanation

Substitution of the 02302.25DRT2SW is determined by strict equivalence in the following electrical and mechanical parameters:

Current Rating: 2.25 A (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Response Time: Slow Blow (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Mounting Type: Through Hole (exact match required)
Package / Case: Cartridge, Non-Standard (Axial) (exact match required)
Size / Dimension: 0.177" Dia x 0.571" L (4.50mm x 14.50mm) (exact match required)
Melting I²t: 39 (exact match required)
Operating Temperature Range: -55°C ~ 125°C (exact match required)

All substitute parts listed below meet these criteria. The primary distinction between the main part and substitutes is product status (obsolete vs. active) and compliance certifications. Substitute parts include DC voltage rating capability (125 V DC) and enhanced regulatory approvals not specified for the main part.

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage AC	Voltage DC	Response Time	Breaking Capacity	Melting I²t	Product Status	RoHS Status	Approvals	Inventory
02302.25DRT2SW	Littelfuse Inc.	2.25 A	250 V	—	Slow Blow	100 A	39	Obsolete	Non-compliant	CSA, METI, UL	831 Pcs
02302.25DRT2SP	Littelfuse Inc.	2.25 A	250 V	125 V	Slow Blow	35 A AC, 10 kA DC	39	Active	ROHS3 Compliant	CE, CSA, PSE, UL	672 Pcs
02302.25DRT1P	Littelfuse Inc.	2.25 A	250 V	125 V	Slow Blow	35 A AC, 10 kA DC	39	Active	ROHS3 Compliant	CE, CSA, PSE, UL	740 Pcs
02302.25DRT1SP	Littelfuse Inc.	2.25 A	250 V	125 V	Slow Blow	35 A AC, 10 kA DC	39	Active	ROHS3 Compliant	CE, CSA, PSE, UL	764 Pcs
02302.25DRT2P	Littelfuse Inc.	2.25 A	250 V	125 V	Slow Blow	35 A AC, 10 kA DC	39	Active	ROHS3 Compliant	CE, CSA, PSE, UL	667 Pcs
02302.25DRT3P	Littelfuse Inc.	2.25 A	250 V	125 V	Slow Blow	35 A AC, 10 kA DC	39	Active	ROHS3 Compliant	CE, CSA, PSE, UL	932 Pcs
02302.25MRT1SSP	Littelfuse Inc.	2.25 A	250 V	125 V	Slow Blow	35 A AC, 10 kA DC	39	Active	ROHS3 Compliant	CE, CSA, PSE, UL	992 Pcs

Engineering Selection Recommendations

All listed substitute parts maintain electrical and mechanical equivalence to the 02302.25DRT2SW. Selection among active alternatives should be based on the following factors:

Product Status: The main part is obsolete. All substitute parts carry active product status, ensuring continued availability and manufacturing support.

Compliance Certifications: Substitute parts include CE, CSA, PSE, and UL approvals, compared to CSA, METI, and UL for the main part. Substitute parts are ROHS3 compliant, whereas the main part is non-compliant.

Packaging: The 02302.25DRT2SP, 02302.25DRT1P, 02302.25DRT1SP, 02302.25DRT2P, 02302.25DRT3P, and 02302.25MRT1SSP are supplied in Tape & Reel (TR) packaging, suitable for automated assembly processes.

Inventory Availability: All substitute parts are in stock. The 02302.25MRT1SSP offers the highest inventory level at 992 pieces.

DC Voltage Capability: Substitute parts are rated for 125 V DC operation, providing expanded application flexibility beyond the AC-only specification of the main part.

Frequently Asked Questions (FAQ)

Q: Can the substitute parts directly replace the 02302.25DRT2SW in existing designs?

A: Yes. All substitute parts maintain identical electrical ratings (2.25 A, 250 V AC), response time (slow blow), fuse type (cartridge, glass), mounting configuration (through hole, axial), and physical dimensions (0.177" Dia x 0.571" L). Mechanical and electrical compatibility is assured.

Q: What is the difference between the main part and substitute parts?

A: The main part (02302.25DRT2SW) is obsolete and lacks DC voltage rating specification. Substitute parts are active products with 125 V DC rating, enhanced regulatory approvals (CE, PSE added), and ROHS3 compliance. All maintain the same AC electrical performance.

Q: Does packaging affect substitution?

A: Packaging does not affect electrical or mechanical compatibility. The main part packaging is not specified. Substitute parts are supplied in Tape & Reel (TR) format, standard for automated assembly. Manual assembly applications are unaffected by packaging format.

Q: Are all substitute parts functionally identical?

A: Yes. All substitute parts meet the same electrical and mechanical specifications. Differences in part numbering (DRT1P, DRT2P, DRT3P, DRT1SP, DRT2SP, MRT1SSP) reflect manufacturing or packaging variations within the same functional specification, not performance differences.

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

A: Any substitute part is suitable for new designs. Selection may be based on packaging preference, inventory availability, or supply chain considerations. All carry active product status and equivalent compliance certifications.

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