Littelfuse 0230.500DRT1SW Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0230.500DRT1SW is a 500 mA, 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 improved compliance status and expanded voltage ratings, making them suitable for direct replacement in new designs and production environments.

Key Parameters

Parameter	Value
Manufacturer	Littelfuse Inc.
Series	230
Current Rating	500 mA
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)
Operating Temperature	-55°C ~ 125°C
Breaking Capacity @ Rated Voltage	35A
Melting I²t	1.16

Substitute Part Grouping Explanation

Substitution for the 0230.500DRT1SW is determined by the following critical parameters:

Current Rating: 500 mA (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)
Physical Dimensions: 0.177" Dia x 0.571" L (exact match required)
Melting I²t: 1.16 (exact match required)

All substitute parts listed maintain these core electrical and mechanical specifications. Substitute parts offer enhanced compliance status (RoHS3 compliant vs. non-compliant) and expanded DC voltage ratings (125 V DC) compared to the main part. Packaging variations (Tape & Reel, Cut Tape) do not affect electrical or mechanical compatibility.

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage AC	Voltage DC	Response Time	Breaking Capacity AC	Breaking Capacity DC	Melting I²t	DC Cold Resistance	Product Status	RoHS Status	Packaging
0230.500DRT1SW	Littelfuse Inc.	500 mA	250 V	—	Slow Blow	35A	—	1.16	0.688 Ω	Obsolete	Non-compliant	—
0230.500DRT1SP	Littelfuse Inc.	500 mA	250 V	125 V	Slow Blow	35A	10kA	1.16	0.6935 Ω	Active	RoHS3 Compliant	Tape & Reel
0230.500DRT1P	Littelfuse Inc.	500 mA	250 V	125 V	Slow Blow	35A	10kA	1.16	0.6935 Ω	Active	RoHS3 Compliant	Cut Tape
0230.500DRT2P	Littelfuse Inc.	500 mA	250 V	125 V	Slow Blow	35A	10kA	1.16	0.6935 Ω	Active	RoHS3 Compliant	Tape & Reel
0230.500DRT2SP	Littelfuse Inc.	500 mA	250 V	125 V	Slow Blow	35A	10kA	1.16	0.6935 Ω	Active	RoHS3 Compliant	Tape & Reel
0230.500DRT3P	Littelfuse Inc.	500 mA	250 V	125 V	Slow Blow	35A	10kA	1.16	0.6935 Ω	Active	RoHS3 Compliant	Tape & Reel
0230.500DRT3SP	Littelfuse Inc.	500 mA	250 V	125 V	Slow Blow	35A	10kA	1.16	0.6935 Ω	Active	RoHS3 Compliant	Tape & Reel
0230.500MRT1SSP	Littelfuse Inc.	500 mA	250 V	125 V	Slow Blow	35A	10kA	1.16	0.6935 Ω	Active	RoHS3 Compliant	Tape & Reel

Engineering Selection Recommendations

All listed substitute parts are active products with RoHS3 compliance status, providing improved regulatory alignment compared to the obsolete 0230.500DRT1SW. The substitute parts maintain identical AC voltage and current ratings while adding 125 V DC capability, expanding application scope without compromising AC circuit protection performance.

Selection between substitute parts depends on packaging requirements: Cut Tape (0230.500DRT1P) for manual assembly or low-volume applications, and Tape & Reel variants (0230.500DRT1SP, 0230.500DRT2P, 0230.500DRT2SP, 0230.500DRT3P, 0230.500DRT3SP, 0230.500MRT1SSP) for automated production environments. All substitute parts carry CE, CSA, and UL approvals, meeting international safety standards.

Frequently Asked Questions (FAQ)

Q: Can 0230.500DRT1P be used as a direct replacement for 0230.500DRT1SW?

A: Yes. Both parts share identical current rating (500 mA), AC voltage rating (250 V), fuse type (cartridge, glass), response time (slow blow), physical dimensions (0.177" Dia x 0.571" L), and melting I²t (1.16). The substitute part adds 125 V DC rating and RoHS3 compliance. Packaging differs (Cut Tape vs. unspecified), but electrical and mechanical compatibility is maintained.

Q: What is the difference between the various substitute part numbers?

A: All substitute parts (0230.500DRT1SP, 0230.500DRT1P, 0230.500DRT2P, 0230.500DRT2SP, 0230.500DRT3P, 0230.500DRT3SP, 0230.500MRT1SSP) are electrically and mechanically identical. Differences are limited to packaging format: Cut Tape (CT) or Tape & Reel (TR). Selection is based on assembly process requirements, not electrical performance.

Q: Why do substitute parts have a lower DC cold resistance value?

A: The substitute parts specify 0.6935 Ω DC cold resistance compared to 0.688 Ω for the main part. This minor variation remains within acceptable tolerance for fuse cartridge specifications and does not affect circuit protection performance or compatibility.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are RoHS3 compliant, whereas the main part 0230.500DRT1SW is RoHS non-compliant. This compliance improvement is a key advantage of substitution for new designs and production environments subject to RoHS regulations.

Q: What certifications do the substitute parts carry?

A: All substitute parts carry CE, CSA, and UL approvals. The main part carries CSA and UL approvals only. The addition of CE certification on substitute parts provides expanded regulatory coverage for European markets.

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