Littelfuse 0230007.DRT3SW Glass Axial Fuse 7A 125VAC Equivalent & Substitute Parts

Part Overview

The Littelfuse 0230007.DRT3SW is a 7A 125VAC slow-blow glass cartridge fuse with axial through-hole mounting. This part is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and production continuity. The substitute parts listed maintain identical electrical and mechanical specifications while offering improved product status and compliance certifications.

Key Parameters

Parameter	Value
Current Rating	7 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
Operating Temperature Range	-55°C ~ 125°C
DC Cold Resistance	0.0115 Ohms
Melting I²t	464

Substitute Part Grouping Explanation

Substitution eligibility for the 0230007.DRT3SW is determined by strict equivalence across the following critical parameters:

Current Rating: 7 A (exact match required)
Voltage Rating (AC): 125 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)
Mounting Type: Through Hole (exact match required)
Physical Dimensions: 0.177" Dia x 0.571" L / 4.50mm x 14.50mm (exact match required)
Breaking Capacity: 400A (exact match required)
Melting I²t: 464 (exact match required)

All substitute parts listed below meet these criteria. The primary distinction between the main part and substitutes is product status (obsolete vs. active) and compliance certifications. Substitute parts also support DC voltage operation at 125V, providing expanded application flexibility.

Parameter Comparison

Parameter	0230007.DRT3SW (Main)	0230007.DRT3SP	0230007.DRT1P	0230007.DRT1SP	0230007.DRT2P	0230007.DRT2SP	0230007.DRT3P	0230007.MRT1SSP
Current Rating (Amps)	7 A	7 A	7 A	7 A	7 A	7 A	7 A	7 A
Voltage Rating - AC	125 V	125 V	125 V	125 V	125 V	125 V	125 V	125 V
Voltage Rating - DC	Not specified	125 V	125 V	125 V	125 V	125 V	125 V	125 V
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow Blow	Slow Blow	Slow Blow	Slow Blow	Slow Blow
Package / Case	Cartridge, Non-Standard (Axial)	Cartridge, Non-Standard (Axial)	Cartridge, Non-Standard (Axial)	Cartridge, Non-Standard (Axial)	Cartridge, Non-Standard (Axial)	Cartridge, Non-Standard (Axial)	Cartridge, Non-Standard (Axial)	Cartridge, Non-Standard (Axial)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Size / Dimension	0.177" Dia x 0.571" L (4.50mm x 14.50mm)	0.177" Dia x 0.571" L (4.50mm x 14.50mm)	0.177" Dia x 0.571" L (4.50mm x 14.50mm)	0.177" Dia x 0.571" L (4.50mm x 14.50mm)	0.177" Dia x 0.571" L (4.50mm x 14.50mm)	0.177" Dia x 0.571" L (4.50mm x 14.50mm)	0.177" Dia x 0.571" L (4.50mm x 14.50mm)	0.177" Dia x 0.571" L (4.50mm x 14.50mm)
Breaking Capacity @ Rated Voltage	400A	400A	400A	400A	400A	400A	400A	400A
Melting I²t	464	464	464	464	464	464	464	464
DC Cold Resistance	0.0115 Ohms	0.0116 Ohms	0.0116 Ohms	0.0116 Ohms	0.0116 Ohms	0.0116 Ohms	0.0116 Ohms	0.0116 Ohms
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	cUL, METI	CE, CSA, PSE, UL	CE, CSA, PSE, UL	CE, CSA, PSE, UL	CE, CSA, PSE, UL	CE, CSA, PSE, UL	CE, CSA, PSE, UL	CE, CSA, PSE, UL
Packaging	Bulk	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

All listed substitute parts are parametrically equivalent to the 0230007.DRT3SW and are suitable for direct replacement in applications requiring a 7A 125VAC slow-blow glass axial fuse. The substitute parts offer the following advantages:

Active product status ensures long-term availability and manufacturing support
ROHS3 compliance meets current environmental and regulatory requirements
Expanded certification portfolio (CE, CSA, PSE, UL) provides broader market acceptance
DC voltage rating (125V) enables use in both AC and DC applications
Tape & Reel packaging supports automated assembly processes

Selection among substitute parts may be based on packaging requirements (Tape & Reel vs. bulk) and specific regional certification needs. All parts maintain identical electrical performance and physical form factor.

Frequently Asked Questions (FAQ)

Q: Can 0230007.DRT3SP be used as a direct replacement for 0230007.DRT3SW?

A: Yes. Both parts share identical current rating (7A), voltage rating (125VAC), fuse type (cartridge glass), response time (slow blow), physical dimensions (0.177" Dia x 0.571" L), and breaking capacity (400A). The primary difference is product status and compliance certifications.

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

A: All substitute parts are parametrically equivalent. Differences exist only in packaging format (Tape & Reel) and internal construction variants (indicated by suffix designations: DRT1P, DRT1SP, DRT2P, DRT2SP, DRT3P, DRT3SP, MRT1SSP). These variants do not affect electrical or mechanical performance.

Q: Does the DC voltage rating on substitute parts affect AC-only applications?

A: No. The addition of a 125V DC rating on substitute parts does not impact AC performance. These parts remain fully compatible with 125VAC circuits and maintain identical slow-blow response characteristics.

Q: Are there any compatibility issues with PCB footprints or through-hole spacing?

A: No. All substitute parts maintain the identical axial cartridge form factor with 0.177" diameter and 0.571" length (4.50mm x 14.50mm). Through-hole mounting compatibility is preserved across all listed parts.

Q: Why is RoHS3 compliance important for this substitution?

A: RoHS3 compliance ensures the part meets current environmental regulations for hazardous substance restrictions. This is particularly important for new designs and products destined for markets with strict environmental requirements.

Q: Can I mix packaging formats (bulk vs. Tape & Reel) in production?

A: Packaging format selection depends on assembly process requirements. Tape & Reel packaging is standard for automated pick-and-place assembly, while bulk packaging may be used for manual assembly or rework operations. Electrical and mechanical performance is identical regardless of packaging format.

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