3JS 7 Equivalent & Substitute Parts

Part Overview

The 3JS 7 is a 7A 350VAC/140VDC slow-blow glass fuse cartridge in 2AG package format (5mm x 15mm axial). This component is classified as obsolete, making identification of suitable substitutes essential for ongoing system maintenance and repair operations. The electrical and mechanical specifications of this fuse determine compatibility with replacement options in active production.

Substiute Parts

3JS 7

Bel Fuse Inc.In Stock: 7973JS 7 Datasheet

Current PartRFQ

3JS 7-R

Bel Fuse Inc.In Stock: 17423JS 7-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3JS 7 is determined by strict equivalence across the following critical parameters:

• Current Rating: 7 A (exact match required)
• Voltage Ratings: 350 V AC and 140 V DC (exact match required)
• Response Time: Slow Blow (exact match required)
• Package / Case: 2AG, 5mm x 15mm (Axial) (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Mounting Type: Through Hole (exact match required)

The 3JS 7-R meets all these criteria and is identified as a direct substitute. Both parts are manufactured by Bel Fuse Inc. and share identical electrical and mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

The 3JS 7-R is the direct substitute for the obsolete 3JS 7. Both parts maintain identical electrical performance and mechanical compatibility. The primary distinction is product status: the 3JS 7-R is in active production, whereas the 3JS 7 is obsolete.

The 3JS 7-R offers improved regulatory compliance, meeting ROHS3 requirements compared to the non-compliant status of the original part. Both parts carry equivalent international approvals (CE, CSA, cURus, PSE) and maintain identical thermal and electrical characteristics across the specified operating range.

Frequently Asked Questions (FAQ)

Q: Can the 3JS 7-R be used as a direct replacement for the 3JS 7?

A: Yes. The 3JS 7-R is electrically and mechanically equivalent to the 3JS 7. Both parts share identical current ratings (7 A), voltage ratings (350 V AC / 140 V DC), response time (Slow Blow), package format (2AG, 5mm x 15mm), and all other critical specifications.

Q: What is the difference between the 3JS 7 and 3JS 7-R?

A: The primary differences are product status and RoHS compliance. The 3JS 7 is obsolete and RoHS non-compliant, while the 3JS 7-R is in active production and ROHS3 compliant. All electrical and mechanical parameters are identical.

Q: Are there any compatibility concerns when substituting the 3JS 7-R for the 3JS 7?

A: No compatibility concerns exist. The 3JS 7-R maintains the same through-hole mounting configuration, physical dimensions (5.50mm diameter x 15.00mm length), and electrical performance characteristics. Direct board-level substitution is supported.

Q: What certifications apply to both parts?

A: Both the 3JS 7 and 3JS 7-R carry CE, CSA, cURus, and PSE approvals. These certifications confirm compliance with relevant safety and performance standards for fuse cartridges in their respective markets.

Q: Is the 3JS 7-R available in different packaging options?

A: The 3JS 7-R is supplied in bulk packaging, whereas the original 3JS 7 was supplied with standard packaging. The component specifications remain unchanged regardless of packaging format.