Littelfuse 0230003.DRT3SW Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0230003.DRT3SW is a 3 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. Due to its obsolete status, equivalent substitute parts from the active product line are available to maintain design continuity and ensure ongoing component availability for production and field replacement applications.

Key Parameters

Parameter	Value
Manufacturer	Littelfuse Inc.
Series	230
Current Rating	3 A
Voltage Rating - AC	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
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	77
Operating Temperature Range	-55°C ~ 125°C
DC Cold Resistance	0.038 Ohms
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the 0230003.DRT3SW is determined by strict equivalence across the following critical parameters:

Current Rating: 3 A (exact match required)
Voltage Rating - AC: 250 V (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Slow Blow (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: 77 (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 (active vs. obsolete) and enhanced compliance certifications in the substitute line.

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage AC	Voltage DC	Response Time	Mounting Type	Size	Melting I²t	Operating Temp	DC Resistance	Product Status	Packaging	RoHS Status
0230003.DRT3SW	Littelfuse Inc.	3 A	250 V	—	Slow Blow	Through Hole	0.177" Dia x 0.571" L	77	-55°C ~ 125°C	0.038 Ω	Obsolete	—	RoHS Non-Compliant
0230003.DRT3SP	Littelfuse Inc.	3 A	250 V	125 V	Slow Blow	Through Hole	0.177" Dia x 0.571" L	77	-55°C ~ 125°C	0.0383 Ω	Active	Tape & Reel	ROHS3 Compliant
0230003.DAT1P	Littelfuse Inc.	3 A	250 V	125 V	Slow Blow	Through Hole	0.177" Dia x 0.571" L	77	-55°C ~ 125°C	0.0383 Ω	Active	Tape & Reel	ROHS3 Compliant
0230003.DRT1P	Littelfuse Inc.	3 A	250 V	125 V	Slow Blow	Through Hole	0.177" Dia x 0.571" L	77	-55°C ~ 125°C	0.0383 Ω	Active	Cut Tape	ROHS3 Compliant
0230003.DRT1SP	Littelfuse Inc.	3 A	250 V	125 V	Slow Blow	Through Hole	0.177" Dia x 0.571" L	77	-55°C ~ 125°C	0.0383 Ω	Active	Tape & Reel	ROHS3 Compliant
0230003.DRT2P	Littelfuse Inc.	3 A	250 V	125 V	Slow Blow	Through Hole	0.177" Dia x 0.571" L	77	-55°C ~ 125°C	0.0383 Ω	Active	Tape & Reel	ROHS3 Compliant
0230003.DRT2SP	Littelfuse Inc.	3 A	250 V	125 V	Slow Blow	Through Hole	0.177" Dia x 0.571" L	77	-55°C ~ 125°C	0.0383 Ω	Active	Tape & Reel	ROHS3 Compliant
0230003.DRT3P	Littelfuse Inc.	3 A	250 V	125 V	Slow Blow	Through Hole	0.177" Dia x 0.571" L	77	-55°C ~ 125°C	0.0383 Ω	Active	Tape & Reel	ROHS3 Compliant
0230003.MRT1EP	Littelfuse Inc.	3 A	250 V	125 V	Slow Blow	Through Hole	0.177" Dia x 0.571" L	77	-55°C ~ 125°C	0.0383 Ω	Active	Tape & Reel	ROHS3 Compliant
0230003.MRT1SSP	Littelfuse Inc.	3 A	250 V	125 V	Slow Blow	Through Hole	0.177" Dia x 0.571" L	77	-55°C ~ 125°C	0.0383 Ω	Active	Tape & Reel	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts are functionally equivalent to the 0230003.DRT3SW across all critical electrical and mechanical parameters. The primary advantages of selecting from the active product line are:

Active product status ensures long-term availability and supply chain continuity
ROHS3 compliance in all substitute parts meets current environmental regulations
Enhanced approval certifications (CE, PSE in addition to CSA, UL) provide broader market acceptance
DC voltage rating of 125 V in substitute parts extends application flexibility while maintaining AC performance equivalence

Selection between substitute parts should be based on packaging requirements (Tape & Reel vs. Cut Tape) and inventory availability for your specific procurement timeline.

Frequently Asked Questions (FAQ)

Q: Can 0230003.DRT3SP directly replace 0230003.DRT3SW in existing designs?

A: Yes. Both parts share identical electrical ratings (3 A, 250 V AC), response characteristics (Slow Blow), physical dimensions (0.177" Dia x 0.571" L), and thermal performance. The addition of 125 V DC rating in the substitute does not affect AC circuit operation.

Q: What is the difference between the substitute parts listed?

A: All substitute parts meet identical electrical and mechanical specifications. Differences are limited to packaging format (Tape & Reel or Cut Tape) and internal manufacturing process designations. Selection should be based on your assembly process requirements.

Q: Why does the main part show no DC voltage rating while substitutes specify 125 V DC?

A: The 0230003.DRT3SW was specified for AC-only applications. The substitute parts in the active product line include DC voltage ratings to support broader application requirements. This does not affect AC performance equivalence.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed are ROHS3 compliant. The original 0230003.DRT3SW is RoHS non-compliant. If RoHS compliance is required for your application, any of the listed substitutes will satisfy this requirement.

Q: What certifications do the substitute parts carry?

A: All substitute parts carry CE, CSA, PSE, and UL approvals. The original part carried CSA, METI, and UL approvals. The expanded certification set in substitutes provides compliance for additional markets and regulatory jurisdictions.

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