3JS 6 Equivalent & Substitute Parts

Part Overview

The 3JS 6 is a 6A 350VAC/140VDC glass cartridge fuse in 2AG form factor (5mm x 15mm axial) manufactured by Bel Fuse Inc. This through-hole mounted fuse is designed for slow-blow response applications requiring CE, CSA, cURus, and PSE certifications. The main part is currently obsolete, making substitute identification critical for ongoing system support and component procurement.

Substiute Parts

3JS 6

Bel Fuse Inc.In Stock: 12103JS 6 Datasheet

Current PartRFQ

3JS 6-R

Bel Fuse Inc.In Stock: 16603JS 6-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3JS 6 is determined by strict equivalence across electrical and mechanical parameters. The substitute must maintain identical current rating (6A), AC voltage rating (350V), DC voltage rating (140V), response time (Slow Blow), package form factor (2AG, 5mm x 15mm), breaking capacity (100A AC, 150A DC), melting I²t value (211), and DC cold resistance (0.015 Ohms). The mounting type (Through Hole) and operating temperature range (-55°C ~ 125°C) must also be preserved. These parameters ensure direct functional and physical compatibility in the original circuit application.

Parameter Comparison

Engineering Selection Recommendations

The 3JS 6-R is the direct substitute for the obsolete 3JS 6. Both parts are manufactured by Bel Fuse Inc. and maintain identical electrical and mechanical specifications across all critical parameters. The 3JS 6-R is currently in active production status with improved RoHS3 compliance, whereas the original 3JS 6 is obsolete and RoHS non-compliant. The 3JS 6-R retains CE, CSA, and cURus certifications; note that PSE certification is not listed for the substitute. For applications requiring PSE certification, compliance verification against the specific end-use requirement is necessary. Both parts are functionally interchangeable in through-hole circuit applications requiring 6A slow-blow fuse protection at 350VAC/140VDC ratings.

Frequently Asked Questions (FAQ)

Q: Can the 3JS 6-R be used as a direct replacement for the 3JS 6?

A: Yes. The 3JS 6-R maintains identical current rating (6A), voltage ratings (350VAC/140VDC), response time (Slow Blow), package form factor (2AG, 5mm x 15mm), breaking capacity, melting I²t, and DC cold resistance. Physical and electrical compatibility is complete.

Q: What is the difference between the 3JS 6 and 3JS 6-R?

A: The primary differences are product status and compliance. The 3JS 6 is obsolete and RoHS non-compliant; the 3JS 6-R is active production and ROHS3 compliant. The 3JS 6-R does not list PSE certification, whereas the original includes it. All electrical and mechanical parameters are identical.

Q: Are there any packaging differences between these parts?

A: The 3JS 6 is supplied in standard packaging, while the 3JS 6-R is supplied in bulk packaging. Both maintain the same 2AG, 5mm x 15mm (Axial) form factor and are through-hole mounted.

Q: What certifications apply to the 3JS 6-R?

A: The 3JS 6-R carries CE, CSA, and cURus certifications. The original 3JS 6 includes PSE certification, which is not listed for the substitute. Verify PSE requirement against your specific application before selection.

Q: Is the 3JS 6-R suitable for the full operating temperature range?

A: Yes. The 3JS 6-R operates across the same temperature range as the original: -55°C to 125°C.