Littelfuse 0230.500DRT2SW Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0230.500DRT2SW 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 necessary to maintain design continuity and ensure component availability for production and field replacement applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	0230.500DRT2SW
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)
Breaking Capacity @ Rated Voltage	35A
Melting I²t	1.16
DC Cold Resistance	0.688 Ohms
Operating Temperature	-55°C ~ 125°C
Approval Agency	CSA, UL
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitute parts for the 0230.500DRT2SW are determined by strict equivalence in the following critical parameters:

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)
Melting I²t: 1.16
Operating Temperature: -55°C ~ 125°C

All substitute parts listed maintain these core electrical and mechanical parameters. Differences in packaging format (Tape & Reel vs. Cut Tape), DC voltage rating capability, and product status are secondary considerations that do not affect functional equivalence in AC-rated applications.

Parameter Comparison

Part Number	Current Rating	Voltage AC	Voltage DC	Response Time	Breaking Capacity	Melting I²t	DC Resistance	Product Status	RoHS Status	Packaging
0230.500DRT2SW	500 mA	250 V	—	Slow Blow	35A	1.16	0.688 Ω	Obsolete	RoHS non-compliant	—
0230.500DRT2SP	500 mA	250 V	125 V	Slow Blow	35A AC, 10kA DC	1.16	0.6935 Ω	Active	ROHS3 Compliant	Tape & Reel
0230.500DRT1P	500 mA	250 V	125 V	Slow Blow	35A AC, 10kA DC	1.16	0.6935 Ω	Active	ROHS3 Compliant	Cut Tape
0230.500DRT1SP	500 mA	250 V	125 V	Slow Blow	35A AC, 10kA DC	1.16	0.6935 Ω	Active	ROHS3 Compliant	Tape & Reel
0230.500DRT2P	500 mA	250 V	125 V	Slow Blow	35A AC, 10kA DC	1.16	0.6935 Ω	Active	ROHS3 Compliant	Tape & Reel
0230.500DRT3P	500 mA	250 V	125 V	Slow Blow	35A AC, 10kA DC	1.16	0.6935 Ω	Active	ROHS3 Compliant	Tape & Reel
0230.500DRT3SP	500 mA	250 V	125 V	Slow Blow	35A AC, 10kA DC	1.16	0.6935 Ω	Active	ROHS3 Compliant	Tape & Reel
0230.500MRT1SSP	500 mA	250 V	125 V	Slow Blow	35A AC, 10kA DC	1.16	0.6935 Ω	Active	ROHS3 Compliant	Tape & Reel

Engineering Selection Recommendations

The 0230.500DRT2SW is obsolete and no longer in active production. All listed substitute parts are active products manufactured by Littelfuse Inc. and maintain electrical and mechanical equivalence for AC-rated applications at 500 mA, 250 V.

Substitute parts 0230.500DRT2SP, 0230.500DRT1P, 0230.500DRT1SP, 0230.500DRT2P, 0230.500DRT3P, 0230.500DRT3SP, and 0230.500MRT1SSP are ROHS3 compliant, whereas the original part is RoHS non-compliant. These substitutes also provide additional DC voltage rating capability (125 V DC) and higher DC breaking capacity (10kA DC), which extends application flexibility without compromising AC performance.

Packaging format selection depends on procurement and assembly requirements: Cut Tape (CT) format is available as 0230.500DRT1P, while Tape & Reel (TR) format is available across all other active substitutes.

Frequently Asked Questions (FAQ)

Q: Can 0230.500DRT2SP be used as a direct replacement for 0230.500DRT2SW?

A: Yes. Both parts share identical current rating (500 mA), AC voltage rating (250 V), fuse type (glass cartridge), response time (slow blow), physical dimensions (0.177" Dia x 0.571" L), and melting I²t (1.16). The primary difference is that 0230.500DRT2SP is an active product with ROHS3 compliance and includes DC voltage rating (125 V DC), which does not affect AC circuit operation.

Q: What is the difference between Cut Tape and Tape & Reel packaging?

A: Cut Tape (CT) format, represented by 0230.500DRT1P, is supplied as individual strips cut to specific lengths for manual handling and lower-volume applications. Tape & Reel (TR) format is supplied on continuous reels for automated assembly equipment. Both formats contain identical components; packaging selection is determined by assembly process requirements.

Q: Are all substitute parts mechanically interchangeable?

A: Yes. All substitute parts maintain the same physical dimensions (0.177" Dia x 0.571" L / 4.50mm x 14.50mm), axial cartridge configuration, and through-hole mounting type. They are mechanically interchangeable in existing designs.

Q: Why do substitute parts have lower DC cold resistance (0.6935 Ω vs. 0.688 Ω)?

A: The DC cold resistance difference is within normal manufacturing tolerance for glass cartridge fuses and does not affect functional performance in AC-rated applications. This parameter is provided for reference only and does not impact circuit operation.

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

A: For new designs, any active substitute part (0230.500DRT2SP, 0230.500DRT1P, 0230.500DRT1SP, 0230.500DRT2P, 0230.500DRT3P, 0230.500DRT3SP, or 0230.500MRT1SSP) is acceptable based on packaging and procurement requirements. ROHS3 compliance is standard across all active substitutes.

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