Equivalent & Substitute Parts for 3JS 2-R Glass Fuse Cartridge

Part Overview

The 3JS 2-R is a 2A slow-blow glass fuse cartridge manufactured by Bel Fuse Inc., rated for 350V AC and 140V DC operation. This through-hole component is designed for circuit protection in applications requiring reliable overcurrent interruption across a wide temperature range (-55°C to 125°C). The part maintains active product status with 1975 units in current inventory. Substitute parts are identified to address application requirements including voltage rating variations, package compatibility, and regional certification needs.

Substiute Parts

3JS 2-R

Bel Fuse Inc.In Stock: 20203JS 2-R Datasheet

Current PartRFQ

0209002.MXEP

LittelfuseIn Stock: 8510209002.MXEP Datasheet

SimilarRFQ

0230002.MXP

Littelfuse Inc.In Stock: 344910230002.MXP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3JS 2-R is determined by the following critical parameters:

• Current Rating: Must be 2 A
• Response Time: Must be Slow Blow
• Fuse Type: Must be Cartridge, Glass
• Mounting Type: Must be Through Hole
• Operating Temperature Range: Must support -55°C ~ 125°C minimum
• RoHS Compliance: Must be ROHS3 Compliant

Voltage ratings (AC and DC) and package dimensions may vary within acceptable limits based on application requirements. Breaking capacity and melting I²t values are application-dependent and must be evaluated against specific circuit protection needs. Approval agency certifications should align with regional regulatory requirements.

Parameter Comparison

Engineering Selection Recommendations

0209002.MXEP (Littelfuse 209 Series): This substitute maintains identical current rating (2A), voltage rating (350V AC), response time (Slow Blow), and package dimensions (2AG, 5mm x 15mm). Operating temperature range and RoHS compliance match the primary part. Approval certifications include CE, cULus, and PSE. This part is suitable for direct substitution in applications where 350V AC operation is required and DC voltage rating is not a limiting factor.

0230002.MXP (Littelfuse 230 Series): This substitute maintains identical current rating (2A), response time (Slow Blow), and operating temperature range. However, voltage ratings are reduced to 250V AC and 125V DC, and package dimensions differ (4.50mm x 14.50mm non-standard cartridge versus 2AG standard). This part is suitable only for applications with lower voltage requirements and where non-standard package dimensions are mechanically compatible. Approval certifications include CE, CSA, PSE, and UL.

Selection between substitutes depends on application voltage requirements and mechanical package constraints. Both substitutes maintain ROHS3 compliance and appropriate operating temperature specifications.

Frequently Asked Questions (FAQ)

Q: Can 0209002.MXEP replace 3JS 2-R in all applications? A: 0209002.MXEP is suitable for applications requiring 350V AC operation with 2A current protection. The primary difference is that DC voltage rating is not specified for the Littelfuse part. Verify DC voltage requirements before substitution.

Q: What are the limitations of 0230002.MXP as a substitute? A: 0230002.MXP has reduced voltage ratings (250V AC, 125V DC) compared to the 3JS 2-R (350V AC, 140V DC). Additionally, the package dimensions are non-standard (4.50mm x 14.50mm) versus the standard 2AG format (5mm x 15mm). This part is only suitable for lower-voltage applications with compatible mechanical mounting.

Q: Are all substitutes ROHS3 compliant? A: Yes, all listed substitutes (0209002.MXEP and 0230002.MXP) are ROHS3 compliant, matching the primary part specification.

Q: How do melting I²t values affect substitution? A: The 3JS 2-R has a melting I²t of 23, while both Littelfuse substitutes have a melting I²t of 30. Higher I²t values indicate slower thermal response. Application-specific circuit protection requirements must be evaluated to determine if this difference is acceptable.

Q: What certifications should I verify for regional compliance? A: The 3JS 2-R carries CE, CSA, cURus, and PSE certifications. 0209002.MXEP carries CE, cULus, and PSE. 0230002.MXP carries CE, CSA, PSE, and UL. Select the substitute that meets your regional regulatory requirements.

Q: Can package dimension differences affect mechanical compatibility? A: Yes. The 3JS 2-R and 0209002.MXEP use standard 2AG packages (5mm x 15mm). The 0230002.MXP uses a non-standard cartridge format (4.50mm x 14.50mm). Verify mechanical fit in your application before substitution.