Littelfuse 0230004.DRT3SW Glass Axial Fuse 4A 125VAC Equivalent & Substitute Parts

Part Overview

The Littelfuse 0230004.DRT3SW is a 4A 125VAC slow-blow glass cartridge fuse with axial through-hole mounting. This part is classified as obsolete. Equivalent and substitute parts are available in active product status with enhanced compliance certifications and packaging options. Substitution is necessary to ensure continued design support, improved regulatory compliance, and manufacturing availability.

Key Parameters

Parameter	Value
Current Rating	4 A
Voltage Rating (AC)	125 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)
Breaking Capacity @ Rated Voltage	400A
Melting I²t	148
Operating Temperature Range	-55°C ~ 125°C
DC Cold Resistance	0.0256 Ohms
Series	230

Substitute Part Grouping Explanation

Substitution for the 0230004.DRT3SW is based on strict electrical and mechanical parameter matching within the Littelfuse 230 series. All substitute parts maintain identical electrical specifications: 4A current rating, 125V AC voltage rating, slow-blow response time, glass cartridge construction, and axial through-hole mounting. Physical dimensions remain constant at 0.177" diameter x 0.571" length (4.50mm x 14.50mm). Breaking capacity and melting I²t values are preserved across all substitutes.

The primary differentiators among substitute parts are:

Product Status: Active versus obsolete
Packaging Format: Tape & Reel (TR), Cut Tape (CT), or bulk
Voltage Rating (DC): Original part lacks DC rating; substitutes include 125V DC capability
Regulatory Compliance: Enhanced certifications (CE, CSA, PSE, UL) versus limited approvals
RoHS Compliance: ROHS3 compliant substitutes versus non-compliant original

All substitute parts are manufactured by Littelfuse Inc. and belong to the 230 series fuse family.

Parameter Comparison

Part Number	Manufacturer	Current Rating (A)	Voltage AC (V)	Voltage DC (V)	Response Time	Fuse Type	Mounting Type	Size (mm)	Breaking Capacity (A)	Melting I²t	DC Resistance (Ω)	Product Status	Packaging	RoHS Status
0230004.DRT3SW	Littelfuse Inc.	4	125	—	Slow Blow	Cartridge, Glass	Through Hole	4.50 x 14.50	400	148	0.0256	Obsolete	—	Non-compliant
0230004.DRT3SP	Littelfuse Inc.	4	125	125	Slow Blow	Cartridge, Glass	Through Hole	4.50 x 14.50	400	148	0.0258	Active	Tape & Reel	ROHS3 Compliant
0230004.DRT1P	Littelfuse Inc.	4	125	125	Slow Blow	Cartridge, Glass	Through Hole	4.50 x 14.50	400	148	0.0258	Active	Cut Tape	ROHS3 Compliant
0230004.DRT1SP	Littelfuse Inc.	4	125	125	Slow Blow	Cartridge, Glass	Through Hole	4.50 x 14.50	400	148	0.0258	Active	Tape & Reel	ROHS3 Compliant
0230004.DRT2P	Littelfuse Inc.	4	125	125	Slow Blow	Cartridge, Glass	Through Hole	4.50 x 14.50	400	148	0.0258	Active	Tape & Reel	ROHS3 Compliant
0230004.DRT2SP	Littelfuse Inc.	4	125	125	Slow Blow	Cartridge, Glass	Through Hole	4.50 x 14.50	400	148	0.0258	Active	Tape & Reel	ROHS3 Compliant
0230004.DRT3P	Littelfuse Inc.	4	125	125	Slow Blow	Cartridge, Glass	Through Hole	4.50 x 14.50	400	148	0.0258	Active	Tape & Reel	ROHS3 Compliant
0230004.MRT1SSP	Littelfuse Inc.	4	125	125	Slow Blow	Cartridge, Glass	Through Hole	4.50 x 14.50	400	148	0.0258	Active	Tape & Reel	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts are electrically and mechanically equivalent to the 0230004.DRT3SW. Selection among substitutes should be based on the following criteria:

Product Status: All substitute parts carry active product status, ensuring long-term availability and manufacturing support compared to the obsolete original part.

Regulatory Compliance: All substitutes are ROHS3 compliant and carry expanded regulatory approvals (CE, CSA, PSE, UL) compared to the original part's limited certifications (cUL, METI). This enhanced compliance supports global market requirements.

Packaging Selection:

0230004.DRT1P (Cut Tape): Suitable for automated pick-and-place assembly with moderate volume requirements
0230004.DRT3SP, 0230004.DRT1SP, 0230004.DRT2P, 0230004.DRT2SP, 0230004.DRT3P, 0230004.MRT1SSP (Tape & Reel): Optimized for high-volume production and automated assembly lines

DC Voltage Capability: All substitutes include 125V DC rating, providing expanded application flexibility beyond the original part's AC-only specification.

Inventory Availability: Substitute parts maintain consistent stock levels (811–6952 units), ensuring reliable procurement across all options.

Frequently Asked Questions (FAQ)

Q: Can 0230004.DRT3SP directly replace 0230004.DRT3SW in existing designs?

A: Yes. Both parts share identical electrical specifications (4A, 125V AC), fuse type (glass cartridge), response time (slow blow), and physical dimensions (4.50mm x 14.50mm). The primary difference is product status (active versus obsolete) and enhanced regulatory compliance in the substitute.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Cut Tape packaging (0230004.DRT1P) is supplied in individual strips suitable for manual or semi-automated assembly. Tape & Reel packaging (all other substitutes) is wound on reels for high-speed automated pick-and-place equipment. Selection depends on production volume and assembly process.

Q: Does the addition of 125V DC rating in substitute parts affect AC-only applications?

A: No. The 125V DC rating is an additional capability that does not alter AC performance. All electrical and thermal characteristics remain identical for AC operation.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitutes carry ROHS3 compliance certification. The original 0230004.DRT3SW is non-compliant.

Q: Which substitute part offers the highest inventory availability?

A: 0230004.DRT1P (Cut Tape) maintains the highest stock level at 6952 units.

Q: Can substitute parts be used interchangeably in the same circuit board design?

A: Yes, provided the packaging format is compatible with the assembly process. All substitutes maintain identical electrical performance and physical dimensions. Verify packaging compatibility with your manufacturing equipment before design finalization.

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