Equivalent & Substitute Parts for 2JS 3

Part Overview

The 2JS 3 is a 3A 350VAC/140VDC glass cartridge fuse in 2AG form factor (5mm x 15mm) manufactured by Bel Fuse Inc. This slow-blow fuse is designed for applications requiring holder-based mounting and meets multiple international approval standards including CE, CSA, PSE, and UR certifications.

The main part (2JS 3) carries an obsolete product status, making identification of active equivalent substitutes essential for ongoing system support and procurement. The substitute 2JS 3-R maintains identical electrical and mechanical specifications while offering active product status and improved compliance characteristics.

Substiute Parts

2JS 3

Bel Fuse Inc.In Stock: 10062JS 3 Datasheet

Current PartRFQ

2JS 3-R

Bel Fuse Inc.In Stock: 41302JS 3-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution between 2JS 3 and 2JS 3-R is valid based on the following criteria:

Electrical Parameters Match:

• Current Rating: 3 A (identical)
• Voltage Rating - AC: 350 V (identical)
• Voltage Rating - DC: 140 V (identical)
• Response Time: Slow Blow (identical)
• Breaking Capacity @ Rated Voltage: 100A AC, 150A DC (identical)
• Melting I²t: 55.2 (identical)

Mechanical Parameters Match:

• Fuse Type: Cartridge, Glass (identical)
• Package / Case: 2AG, 5mm x 15mm (identical)
• Mounting Type: Requires Holder (identical)
• Operating Temperature Range: -55°C ~ 125°C (identical)

Both parts are manufactured by Bel Fuse Inc. within the same 2JS series and maintain full compatibility in holder-based applications. The substitute part 2JS 3-R is the direct active equivalent for the obsolete 2JS 3.

Parameter Comparison

Engineering Selection Recommendations

The 2JS 3-R is the direct substitute for the obsolete 2JS 3. Selection of 2JS 3-R is appropriate based on the following factors:

Product Status: The 2JS 3-R maintains active product status with 4077 units in stock, ensuring long-term availability and supply chain continuity compared to the obsolete 2JS 3.

Compliance Improvements: The 2JS 3-R achieves ROHS3 compliance, addressing modern regulatory requirements. Both parts maintain REACH Unaffected status and identical international approval certifications (CE, CSA, PSE).

Electrical Equivalence: All critical electrical parameters are identical, including current rating, voltage ratings, breaking capacity, and melting I²t characteristics. The DC cold resistance difference (0.045 Ohms vs. 0.036 Ohms) reflects manufacturing improvements in the active variant.

Mechanical Compatibility: Both parts share identical 2AG form factor dimensions and holder-based mounting requirements, ensuring direct physical interchangeability in existing applications.

Frequently Asked Questions (FAQ)

Q: Can 2JS 3-R directly replace 2JS 3 in existing applications?

A: Yes. The 2JS 3-R is electrically and mechanically equivalent to 2JS 3. Both parts have identical current ratings (3A), voltage ratings (350VAC/140VDC), response time (slow blow), and 2AG package dimensions (5mm x 15mm). Direct substitution is valid for holder-based fuse applications.

Q: What is the difference between 2JS 3 and 2JS 3-R?

A: The primary differences are product status and compliance. The 2JS 3 is obsolete, while 2JS 3-R is active. The 2JS 3-R achieves ROHS3 compliance compared to the non-compliant 2JS 3. DC cold resistance is slightly lower in 2JS 3-R (0.036 Ohms vs. 0.045 Ohms), representing manufacturing refinement. All electrical and mechanical specifications remain identical.

Q: Are both parts approved by the same certification bodies?

A: Both parts carry CE, CSA, and PSE approvals. The 2JS 3 includes UR certification, while 2JS 3-R includes cURus certification. These represent equivalent North American approval standards.

Q: What is the 2AG package format?

A: 2AG refers to a standardized glass cartridge fuse form factor measuring 5mm in diameter by 15mm in length (0.201" Dia x 0.543" L). Both parts require a compatible 2AG fuse holder for installation.

Q: Is the DC cold resistance difference significant?

A: The DC cold resistance difference (0.045 Ohms in 2JS 3 vs. 0.036 Ohms in 2JS 3-R) reflects manufacturing improvements in the active variant. This lower resistance in 2JS 3-R represents improved performance characteristics and does not affect substitution compatibility.