Bel Fuse Inc. 3JS 1 Equivalent & Substitute Parts

Part Overview

The Bel Fuse Inc. 3JS 1 is a 1 A, 350 V AC / 140 V DC slow blow glass cartridge fuse in 2AG package format (5mm x 15mm axial). This through-hole mounted fuse is designed for circuit protection applications requiring moderate current ratings with extended response time characteristics.

The 3JS 1 is classified as obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this component.

Substiute Parts

3JS 1

Bel Fuse Inc.In Stock: 11923JS 1 Datasheet

Current PartRFQ

3JS 1-R

Bel Fuse Inc.In Stock: 30553JS 1-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3JS 1 is determined by strict equivalence across the following critical parameters:

• Current Rating: 1 A (exact match required)
• Voltage Rating - AC: 350 V (exact match required)
• Voltage Rating - DC: 140 V (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Package / Case: 2AG, 5mm x 15mm (Axial) (exact match required)
• Response Time: Slow Blow (exact match required)
• Mounting Type: Through Hole (exact match required)
• Breaking Capacity @ Rated Voltage: 100A AC, 150A DC (exact match required)
• Melting I²t: 5.93 (exact match required)

The substitute part 3JS 1-R meets all electrical and mechanical equivalence criteria and is manufactured by the same supplier, Bel Fuse Inc., within the same product series.

Parameter Comparison

Engineering Selection Recommendations

The 3JS 1-R is the direct substitute for the obsolete 3JS 1. Both parts maintain identical electrical and mechanical specifications across all critical parameters. The 3JS 1-R carries active product status, ensuring ongoing availability and supply chain support.

The 3JS 1-R provides improved regulatory compliance, meeting ROHS3 requirements compared to the non-compliant status of the original 3JS 1. Both parts retain equivalent approval certifications (CE, CSA, cURus, PSE) and maintain the same operating temperature range and breaking capacity specifications.

For new designs or production transitions, the 3JS 1-R is the appropriate selection. For legacy system maintenance where the original 3JS 1 is specified, the 3JS 1-R provides direct functional equivalence with enhanced compliance status.

Frequently Asked Questions (FAQ)

Q: Can the 3JS 1-R be used as a direct replacement for the 3JS 1?

A: Yes. The 3JS 1-R is electrically and mechanically equivalent to the 3JS 1 across all specified parameters, including current rating, voltage ratings, fuse type, package format, response time, and breaking capacity.

Q: What is the difference between the 3JS 1 and 3JS 1-R?

A: The primary differences are product status and regulatory compliance. The 3JS 1 is obsolete with RoHS non-compliant status. The 3JS 1-R is active product with ROHS3 compliance. All electrical and mechanical specifications remain identical.

Q: Are there any packaging differences between these parts?

A: The 3JS 1 is supplied in standard packaging, while the 3JS 1-R is supplied in bulk packaging. Both maintain the same 2AG, 5mm x 15mm (Axial) physical format and are through-hole mounted components.

Q: Do both parts have the same approval certifications?

A: Yes. Both the 3JS 1 and 3JS 1-R carry identical approval certifications: CE, CSA, cURus, and PSE.

Q: What is the operating temperature range for these fuses?

A: Both parts operate across the temperature range of -55°C to 125°C.