Equivalent & Substitute Parts for 3JS 5-R Fuse

Part Overview

The 3JS 5-R is a 5A glass cartridge fuse manufactured by Bel Fuse Inc., rated for 350V AC and 140V DC operation. This slow-blow fuse is designed for through-hole mounting in the 2AG form factor (5mm x 15mm axial configuration). The product is currently active and widely stocked, with 1344 units available in inventory. Alternative equivalent parts may be required due to supply chain considerations, design revisions, or specific application requirements where substitute ratings remain within acceptable operational parameters.

Substiute Parts

3JS 5-R

Bel Fuse Inc.In Stock: 14223JS 5-R Datasheet

Current PartRFQ

0209005.MXEP

Littelfuse Inc.In Stock: 24020209005.MXEP Datasheet

SimilarRFQ

0230005.MXP

Littelfuse Inc.In Stock: 33270230005.MXP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3JS 5-R is determined by the following critical parameters:

• Current Rating: Must be 5 A (exact match required)
• Voltage Rating - AC: Must be ≥ 350 V
• Voltage Rating - DC: Must be ≥ 140 V
• Fuse Type: Must be Cartridge, Glass
• Response Time: Must be Slow Blow
• Mounting Type: Must be Through Hole
• Package / Case: Must be compatible 2AG form factor or equivalent axial cartridge
• Operating Temperature Range: Must support -55°C to 125°C minimum
• Product Status: Must be Active
• RoHS Compliance: Must maintain ROHS3 Compliant status

Two substitute parts meet these criteria with specific operational considerations noted in the parameter comparison section below.

Parameter Comparison

Engineering Selection Recommendations

0209005.MXEP (Littelfuse Inc., Series 209) is a direct functional equivalent for applications operating at 350V AC. This substitute maintains the 5A current rating, slow-blow response characteristic, and 2AG form factor. Physical dimensions are slightly smaller (4.70mm diameter vs. 5.50mm), which may require verification for mechanical fit in existing fuse holders. The melting I²t value of 267 differs from the original 135, indicating a different thermal response profile. This part carries CE, cULus, and PSE certifications with ROHS3 compliance. DC voltage rating is not specified in available documentation.

0230005.MXP (Littelfuse Inc., Series 230) is suitable only for applications where the circuit voltage does not exceed 125V AC/DC. This substitute maintains the 5A current rating and slow-blow response but operates at reduced voltage ratings (125V AC/125V DC vs. 350V AC/140V DC). The non-standard cartridge form factor requires mechanical compatibility verification. This part offers the highest breaking capacity (400A) and includes UL certification in addition to CE, CSA, and PSE approvals. ROHS3 compliance is maintained.

Selection between substitutes must be based on actual circuit voltage requirements. The 3JS 5-R should be retained for applications requiring 350V AC or 140V DC operation. Substitution is only valid when circuit voltage specifications permit operation at the lower ratings of the alternative part.

Frequently Asked Questions (FAQ)

Q: Can 0209005.MXEP replace 3JS 5-R in all applications?

A: 0209005.MXEP is suitable for applications operating at 350V AC. However, the DC voltage rating is not specified in available documentation, and the melting I²t differs (267 vs. 135). Physical dimensions are also slightly smaller. Verification of mechanical fit and thermal response characteristics is necessary before substitution.

Q: What is the key difference between 0209005.MXEP and 0230005.MXP?

A: The primary difference is voltage rating. 0209005.MXEP maintains 350V AC rating, while 0230005.MXP is limited to 125V AC/DC. 0230005.MXP uses a non-standard cartridge form factor and offers higher breaking capacity (400A). Selection depends on circuit voltage requirements.

Q: Can 0230005.MXP be used in place of 3JS 5-R?

A: 0230005.MXP is only suitable for circuits operating at 125V AC or lower. It cannot be used in applications requiring 350V AC or 140V DC operation. The reduced voltage rating makes this substitute incompatible with higher-voltage circuit designs.

Q: Are there mechanical compatibility concerns with these substitutes?

A: Yes. Both Littelfuse substitutes have smaller diameters than the original 3JS 5-R (4.70mm and 4.50mm vs. 5.50mm). Verification of fit within existing fuse holders is required before installation. 0230005.MXP uses a non-standard form factor and requires additional mechanical assessment.

Q: Do all parts maintain the same certifications?

A: No. The 3JS 5-R carries CE, CSA, cURus, and PSE certifications. 0209005.MXEP carries CE, cULus, and PSE. 0230005.MXP carries CE, CSA, PSE, and UL. Application-specific certification requirements must be verified before substitution.

Q: What does the difference in melting I²t indicate?

A: Melting I²t (135 for 3JS 5-R vs. 267 for both Littelfuse substitutes) indicates thermal response time. The higher I²t value means the substitute fuses will tolerate higher energy input before melting. This difference may affect circuit protection characteristics and requires evaluation for specific applications.