2JS 4 Equivalent & Substitute Parts

Part Overview

The 2JS 4 is a 4A slow-blow glass cartridge fuse rated for 350V AC and 140V DC operation, designed for 2AG holder mounting with 5mm x 15mm dimensions. This component is classified as obsolete, making identification of active equivalent parts essential for ongoing system maintenance and component procurement. The substitute 2JS 4-R provides functional equivalence with improved compliance status and availability.

Substiute Parts

2JS 4

Bel Fuse Inc.In Stock: 8212JS 4 Datasheet

Current PartRFQ

2JS 4-R

Bel Fuse Inc.In Stock: 27752JS 4-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The 2JS 4-R qualifies as a direct substitute based on identical electrical and mechanical parameters: 4A current rating, 350V AC / 140V DC voltage ratings, slow-blow response characteristic, 2AG package format, 5mm x 15mm dimensions, 100A AC / 150A DC breaking capacity, and 86 melting I²t value. Both components share the same operating temperature range (-55°C ~ 125°C) and approval certifications. The substitution is valid across all specified electrical and mechanical criteria.

Parameter Comparison

Engineering Selection Recommendations

The 2JS 4-R is the appropriate selection for new designs and component replacement applications. This substitute maintains full electrical and mechanical compatibility with the obsolete 2JS 4 while offering active product status and improved regulatory compliance. The 2JS 4-R carries ROHS3 compliance, whereas the original part does not, making it suitable for applications subject to RoHS requirements. Both components hold equivalent approval certifications (CE, CSA, PSE) with the 2JS 4-R additionally certified as cURus. Component selection should be based on regulatory requirements and system voltage/current specifications matching the 4A / 350V AC / 140V DC ratings.

Frequently Asked Questions (FAQ)

Q: Can 2JS 4-R replace 2JS 4 in existing installations? A: Yes. The 2JS 4-R provides complete electrical and mechanical equivalence. Both components share identical current ratings (4A), voltage ratings (350V AC / 140V DC), response characteristics (slow-blow), and physical dimensions (2AG, 5mm x 15mm). Direct substitution is valid without circuit modification.

Q: What is the difference between 2JS 4 and 2JS 4-R? A: The primary differences are product status and compliance. The 2JS 4 is obsolete with RoHS non-compliant status. The 2JS 4-R is an active product with ROHS3 compliance. Electrical and mechanical specifications are identical.

Q: Are there packaging differences between these parts? A: The 2JS 4 is available in standard packaging, while the 2JS 4-R is supplied in bulk packaging. Both maintain the same 2AG, 5mm x 15mm physical format and are compatible with identical holder assemblies.

Q: What certifications apply to both parts? A: Both components carry CE, CSA, and PSE approvals. The 2JS 4 additionally holds UR certification, while the 2JS 4-R holds cURus certification. All certifications are valid for the specified voltage and current ratings.

Q: Is the 2JS 4-R suitable for RoHS-regulated applications? A: Yes. The 2JS 4-R is ROHS3 compliant, making it appropriate for applications subject to RoHS directives. The original 2JS 4 is not RoHS compliant.