Equivalent & Substitute Parts for 3JS 4.6

Part Overview

The 3JS 4.6 is a 4.6 A slow-blow glass cartridge fuse rated for 350 V AC and 140 V DC operation. Manufactured by Bel Fuse Inc., this through-hole component features a 2AG form factor with dimensions of 5mm x 15mm (axial). The main part number 3JS 4.6 is currently obsolete, necessitating identification of active equivalent alternatives for continued system support and procurement.

Substiute Parts

3JS 3.5

Bel Fuse Inc.In Stock: 9313JS 3.5 Datasheet

Current PartRFQ

3JS 3.5-R

Bel Fuse Inc.In Stock: 21453JS 3.5-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete 3JS 4.6 is determined by electrical and mechanical parameter equivalence. The substitute part 3JS 4.6-R maintains identical electrical specifications: 4.6 A current rating, 350 V AC and 140 V DC voltage ratings, slow-blow response characteristic, and identical breaking capacity. Mechanical compatibility is ensured through matching package designation (2AG, 5mm x 15mm axial), mounting type (through-hole), and physical dimensions. Thermal operating range and regulatory certifications (CE, CSA, cURus, PSE) are preserved. The primary distinction is product status: 3JS 4.6-R is active with RoHS3 compliance, whereas the original 3JS 4.6 is obsolete and RoHS non-compliant.

Parameter Comparison

Engineering Selection Recommendations

The 3JS 4.6-R is the direct active equivalent for the obsolete 3JS 4.6. Selection of 3JS 4.6-R is based on product status transition from obsolete to active, combined with RoHS3 compliance certification. All electrical parameters, mechanical dimensions, and regulatory certifications remain equivalent. The substitute part is available in bulk packaging with higher inventory levels (2123 pcs vs. 899 pcs), supporting sustained procurement requirements. The marginal reduction in DC cold resistance (0.03 Ohms vs. 0.037 Ohms) falls within acceptable tolerance for cartridge fuse applications and does not affect functional performance within the specified electrical ratings.

Frequently Asked Questions (FAQ)

Q: Can 3JS 4.6-R be used as a direct replacement for 3JS 4.6 in existing designs?

A: Yes. The 3JS 4.6-R maintains identical electrical ratings (4.6 A, 350 V AC, 140 V DC), response time (slow-blow), and mechanical form factor (2AG, 5mm x 15mm through-hole). No circuit redesign is required.

Q: What is the significance of the RoHS3 compliance difference?

A: The 3JS 4.6-R meets RoHS3 environmental compliance standards, whereas the original 3JS 4.6 does not. For applications subject to RoHS regulatory requirements, 3JS 4.6-R is the compliant choice.

Q: Are the regulatory certifications identical between the two parts?

A: Yes. Both parts carry CE, CSA, cURus, and PSE approvals, ensuring equivalent regulatory acceptance across markets.

Q: Does the difference in DC cold resistance affect circuit performance?

A: The DC cold resistance difference (0.037 Ohms vs. 0.03 Ohms) is within normal manufacturing tolerance for cartridge fuses and does not impact functional performance within the specified electrical ratings.

Q: What packaging options are available for 3JS 4.6-R?

A: The 3JS 4.6-R is supplied in bulk packaging, with higher inventory availability (2123 pcs) compared to the obsolete 3JS 4.6 (899 pcs).