2JS 1 Glass Cartridge Fuse - Equivalent & Substitute Parts

Part Overview

The 2JS 1 is a 1 A, 350 V AC / 140 V DC slow-blow glass cartridge fuse manufactured by Bel Fuse Inc. in the 2AG package format (5mm x 15mm). This component is classified as obsolete, indicating discontinued production. Identifying equivalent and substitute parts is necessary to maintain system functionality and ensure continued availability for applications requiring this electrical protection specification.

Substiute Parts

2JS 1

Bel Fuse Inc.In Stock: 7422JS 1 Datasheet

Current PartRFQ

2JS 1-R

Bel Fuse Inc.In Stock: 11422JS 1-R Datasheet

DirectRFQ

BK1/TDC11-1A

Eaton - Electronics DivisionIn Stock: 1047BK1/TDC11-1A Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 2JS 1 are identified based on electrical and mechanical compatibility within the following criteria:

• 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)
• Response Time: Slow Blow (exact match required)
• Package / Case: 2AG, 5mm x 15mm (exact match required)
• Breaking Capacity @ Rated Voltage: 100A AC, 150A DC (exact match required)
• Melting I²t: 5.93 (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

Parameter Comparison

Engineering Selection Recommendations

The 2JS 1-R is the direct substitute for the obsolete 2JS 1. Both parts are manufactured by Bel Fuse Inc. and share identical electrical and mechanical specifications. The 2JS 1-R is currently in active production status with improved RoHS3 compliance, making it the preferred replacement for new designs and ongoing applications.

The BK1/TDC11-1A from Eaton - Electronics Division differs in package format (3AB, 3AG versus 2AG) and lacks complete specification documentation for DC voltage rating, response time, breaking capacity, and melting I²t. This part is not suitable as a direct substitute due to package incompatibility and incomplete electrical parameter alignment.

Frequently Asked Questions (FAQ)

Q: Can the 2JS 1-R be used as a direct replacement for the 2JS 1?

A: Yes. The 2JS 1-R meets all electrical and mechanical requirements of the 2JS 1, including current rating, voltage ratings, fuse type, response time, package format, breaking capacity, and melting I²t. The primary advantage is active production status and RoHS3 compliance.

Q: What is the significance of the different DC cold resistance values between 2JS 1 and 2JS 1-R?

A: The 2JS 1-R exhibits lower DC cold resistance (0.19 Ohms versus 0.281 Ohms). Both values remain within acceptable operating parameters for the specified application. This difference reflects manufacturing improvements in the active production variant.

Q: Is the BK1/TDC11-1A compatible with the 2JS 1?

A: No. The BK1/TDC11-1A uses a different package format (3AB, 3AG, 1/4" x 1-1/4") compared to the 2JS 1 (2AG, 5mm x 15mm). Physical incompatibility with existing fuse holders prevents direct substitution. Additionally, complete electrical specifications for this part are not provided.

Q: What certifications apply to the 2JS 1-R?

A: The 2JS 1-R carries CE, CSA, cURus, and PSE approvals. It is ROHS3 compliant and REACH unaffected.