Littelfuse 0230004.DRT1SW Glass Axial Fuse 4A 125VAC Equivalent & Substitute Parts

Part Overview

The Littelfuse 0230004.DRT1SW is a 4 A, 125 V AC DC glass cartridge fuse with axial through-hole mounting. This component is classified as obsolete, which necessitates identification of active equivalent alternatives for ongoing design support and procurement. The fuse operates across a temperature range of -55°C to 125°C with a slow-blow response characteristic and 400 A breaking capacity at rated voltage. Substitute parts must maintain identical electrical performance and mechanical compatibility while offering active product status and improved compliance certifications.

Substiute Parts

0230004.DRT1SW

Littelfuse Inc.In Stock: 11090230004.DRT1SW Datasheet

Current PartRFQ

0230004.DRT1SP

Littelfuse Inc.In Stock: 8260230004.DRT1SP Datasheet

DirectRFQ

0230004.DRT1P

Littelfuse Inc.In Stock: 69950230004.DRT1P Datasheet

Parametric EquivalentRFQ

0230004.DRT2P

Littelfuse Inc.In Stock: 10570230004.DRT2P Datasheet

Parametric EquivalentRFQ

0230004.DRT2SP

LittelfuseIn Stock: 12740230004.DRT2SP Datasheet

Parametric EquivalentRFQ

0230004.DRT3P

Littelfuse Inc.In Stock: 10120230004.DRT3P Datasheet

Parametric EquivalentRFQ

0230004.DRT3SP

Littelfuse Inc.In Stock: 11240230004.DRT3SP Datasheet

Parametric EquivalentRFQ

0230004.MRT1SSP

Littelfuse Inc.In Stock: 11220230004.MRT1SSP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters:

• Current Rating: 4 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)
• Mounting Type: Through Hole (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)
• Breaking Capacity @ Rated Voltage: 400 A (exact match required)
• Melting I²t: 148 (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

All identified substitute parts meet these criteria. Substitute parts additionally provide 125 V DC voltage rating, which extends application flexibility beyond the main part specification. Packaging variations (Tape & Reel or Cut Tape) represent the primary differentiation among substitutes and do not affect electrical or mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

All identified substitute parts are electrically and mechanically equivalent to the 0230004.DRT1SW. Selection among substitutes should be based on the following factors:

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

Compliance Certifications: The main part holds cUL and METI approvals with RoHS non-compliant status. All substitute parts achieve ROHS3 compliance and carry expanded certification coverage including CE, CSA, PSE, and UL approvals, providing broader regulatory acceptance across international markets.

Packaging Format: Substitute parts are available in two packaging configurations: Tape & Reel (0230004.DRT1SP, 0230004.DRT2P, 0230004.DRT2SP, 0230004.DRT3P, 0230004.DRT3SP, 0230004.MRT1SSP) and Cut Tape (0230004.DRT1P). Packaging selection depends on assembly process requirements and inventory management practices. Tape & Reel packaging supports automated pick-and-place operations, while Cut Tape accommodates manual assembly or lower-volume applications.

DC Voltage Rating: Substitute parts specify 125 V DC rating in addition to 125 V AC, enabling use in DC applications where the main part specification is silent.

Inventory Availability: All substitute parts maintain active stock levels ranging from 811 to 6952 units, with 0230004.DRT1P offering the highest availability at 6952 pieces.

Frequently Asked Questions (FAQ)

Q: Can 0230004.DRT1P be used as a direct replacement for 0230004.DRT1SW in existing designs?

A: Yes. Both parts are electrically and mechanically identical across all critical parameters: 4 A current rating, 125 V AC voltage, slow-blow response, 400 A breaking capacity, and identical physical dimensions. The primary difference is packaging format (Cut Tape vs. unspecified for the main part) and product status (Active vs. Obsolete). 0230004.DRT1P is the recommended replacement for new procurement.

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

A: Tape & Reel packaging supplies components on continuous carrier tape wound on reels, optimized for automated assembly equipment. Cut Tape provides individual components pre-cut from the carrier tape, suitable for manual assembly or lower-volume production. Both packaging formats contain electrically identical components.

Q: Does the DC voltage rating on substitute parts affect compatibility?

A: No. The addition of 125 V DC rating on substitute parts extends application flexibility without affecting AC operation. Designs using the main part in AC-only applications will function identically with substitute parts. Designs requiring DC operation can now utilize these substitutes.

Q: Are all substitute parts REACH compliant?

A: Yes. All substitute parts carry REACH Unaffected status, indicating compliance with REACH regulations.

Q: What certifications should I prioritize for regulatory compliance?

A: Substitute parts carry CE, CSA, PSE, and UL certifications. Selection depends on target markets: CE for European Union, CSA for North America, PSE for Japan, and UL for North American industrial applications. All substitute parts satisfy these requirements simultaneously.

Q: Is there a performance difference between substitute parts with different part number suffixes?

A: No. All substitute parts (DRT1SP, DRT1P, DRT2P, DRT2SP, DRT3P, DRT3SP, MRT1SSP) are parametrically equivalent. Suffix variations indicate internal manufacturing or packaging line designations and do not affect electrical or mechanical performance.