Littelfuse 0230003.DRT2SW Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0230003.DRT2SW 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, making equivalent and substitute parts necessary for ongoing design support and procurement.

The 0230003.DRT2SW operates across a temperature range of -55°C to 125°C with a melting I²t rating of 77 and a DC cold resistance of 0.038 Ohms. It meets CSA, METI, and UL approval standards and is not RoHS compliant.

Key Parameters

Parameter	Value
Current Rating	3 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	Cartridge, Non-Standard (Axial)
Mounting Type	Through Hole
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.DRT2SW is determined by 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)
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 maintain these core electrical and mechanical parameters. Substitute parts are differentiated by packaging format (Tape & Reel or Cut Tape), product status (Active vs. Obsolete), and compliance certifications (RoHS3 compliance and REACH status).

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage AC	Voltage DC	Response Time	Breaking Capacity AC	Breaking Capacity DC	Melting I²t	DC Cold Resistance	Packaging	Product Status	RoHS Status
0230003.DRT2SW	Littelfuse Inc.	3 A	250 V	—	Slow Blow	100 A	—	77	0.038 Ohms	—	Obsolete	Non-compliant
0230003.DRT2SP	Littelfuse Inc.	3 A	250 V	125 V	Slow Blow	35 A	10 kA	77	0.0383 Ohms	Tape & Reel	Active	ROHS3 Compliant
0230003.DAT1P	Littelfuse Inc.	3 A	250 V	125 V	Slow Blow	100 A	10 kA	77	0.0383 Ohms	Tape & Reel	Active	ROHS3 Compliant
0230003.DRT1P	Littelfuse Inc.	3 A	250 V	125 V	Slow Blow	35 A	10 kA	77	0.0383 Ohms	Cut Tape	Active	ROHS3 Compliant
0230003.DRT1SP	Littelfuse Inc.	3 A	250 V	125 V	Slow Blow	35 A	10 kA	77	0.0383 Ohms	Tape & Reel	Active	ROHS3 Compliant
0230003.DRT2P	Littelfuse Inc.	3 A	250 V	125 V	Slow Blow	35 A	10 kA	77	0.0383 Ohms	Tape & Reel	Active	ROHS3 Compliant
0230003.DRT3P	Littelfuse Inc.	3 A	250 V	125 V	Slow Blow	35 A	10 kA	77	0.0383 Ohms	Tape & Reel	Active	ROHS3 Compliant
0230003.DRT3SP	Littelfuse Inc.	3 A	250 V	125 V	Slow Blow	35 A	10 kA	77	0.0383 Ohms	Tape & Reel	Active	ROHS3 Compliant
0230003.MRT1EP	Littelfuse Inc.	3 A	250 V	125 V	Slow Blow	35 A	10 kA	77	0.0383 Ohms	Tape & Reel	Active	ROHS3 Compliant
0230003.MRT1SSP	Littelfuse Inc.	3 A	250 V	125 V	Slow Blow	35 A	10 kA	77	0.0383 Ohms	Tape & Reel	Active	ROHS3 Compliant

Engineering Selection Recommendations

All substitute parts maintain the core electrical and mechanical specifications of the 0230003.DRT2SW. The primary differences are:

Product Status: All substitute parts are classified as Active, providing ongoing availability and support compared to the obsolete main part.

Compliance: All substitute parts are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. The original 0230003.DRT2SW is non-compliant with RoHS standards.

Certifications: All substitute parts carry CE, CSA, PSE, and UL approvals, expanding the certification scope beyond the original part's CSA, METI, and UL approvals.

Packaging Options: Substitute parts are available in Tape & Reel (TR) and Cut Tape (CT) formats. The 0230003.DRT1P is the only substitute available in Cut Tape format, offering flexibility for different assembly processes.

Breaking Capacity: The 0230003.DAT1P maintains the original 100 A AC breaking capacity. Other substitutes provide 35 A AC breaking capacity, which remains suitable for the 3 A current rating application.

DC Voltage Rating: All substitute parts add 125 V DC rating capability, providing enhanced versatility for applications requiring DC circuit protection.

Frequently Asked Questions (FAQ)

Q: Can I directly replace the 0230003.DRT2SW with any of the listed substitute parts?

A: Yes. All substitute parts maintain identical current rating (3 A), AC voltage rating (250 V), fuse type (Cartridge, Glass), response time (Slow Blow), package configuration (Cartridge, Non-Standard Axial), physical dimensions (0.177" Dia x 0.571" L), melting I²t (77), and operating temperature range (-55°C to 125°C). The substitute parts are electrically and mechanically equivalent.

Q: What is the difference between the packaging options?

A: The 0230003.DRT1P is supplied in Cut Tape (CT) format, suitable for manual or semi-automated assembly. All other substitute parts are supplied in Tape & Reel (TR) format, optimized for automated pick-and-place assembly processes. The electrical and mechanical specifications are identical across all packaging formats.

Q: Why do the substitute parts have a 125 V DC rating when the original part does not?

A: The 0230003.DRT2SW does not specify a DC voltage rating. The substitute parts explicitly include 125 V DC rating, providing additional application flexibility. This addition does not affect AC circuit compatibility and represents an enhancement to the product specification.

Q: Are there differences in breaking capacity between the substitute parts?

A: The 0230003.DAT1P maintains the original 100 A AC breaking capacity. Other substitute parts specify 35 A AC breaking capacity. Both ratings are suitable for protecting 3 A circuits. The breaking capacity difference reflects design variations within the Littelfuse 230 series but does not affect functional equivalence for standard 3 A protection applications.

Q: Which substitute part should I select for new designs?

A: For new designs, select from the Active status parts based on your assembly process requirements. If using automated assembly with tape-and-reel equipment, choose from 0230003.DRT2SP, 0230003.DAT1P, 0230003.DRT1SP, 0230003.DRT2P, 0230003.DRT3P, 0230003.DRT3SP, 0230003.MRT1EP, or 0230003.MRT1SSP. If using manual or semi-automated assembly, select 0230003.DRT1P (Cut Tape format). All parts meet current RoHS3 and REACH compliance requirements.

Q: Is the DC cold resistance difference between 0.038 Ohms and 0.0383 Ohms significant?

A: No. The difference of 0.0003 Ohms is negligible and falls within normal manufacturing tolerance for fuse elements. This variation does not affect circuit performance or protection characteristics.

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