3JS 7-R Equivalent & Substitute Parts

Part Overview

The 3JS 7-R is a 7A 350VAC/140VDC slow-blow glass cartridge fuse manufactured by Bel Fuse Inc. in the 2AG form factor (5mm x 15mm axial). This component is designed for circuit protection in applications requiring moderate current ratings with dual voltage specifications. The part maintains Active product status with full compliance certifications (CE, CSA, cURus, PSE) and is RoHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across the specified parameter ranges.

Substiute Parts

3JS 7-R

Bel Fuse Inc.In Stock: 17423JS 7-R Datasheet

Current PartRFQ

0209007.MXEP

Littelfuse Inc.In Stock: 130150209007.MXEP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3JS 7-R is determined by the following mandatory parameters:

• Current Rating: 7 A (exact match required)
• Voltage Rating - AC: 350 V (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Slow Blow (exact match required)
• Package / Case: 2AG, 5mm x 15mm (Axial) (exact match required)
• Mounting Type: Through Hole (exact match required)

The substitute part 0209007.MXEP (Littelfuse Inc.) meets all mandatory electrical and mechanical parameters. Variations in secondary parameters such as melting I²t, breaking capacity, and dimensional tolerances remain within acceptable ranges for functional equivalence in the specified application category.

Parameter Comparison

Engineering Selection Recommendations

Both the 3JS 7-R and 0209007.MXEP maintain Active product status and satisfy core compliance requirements (CE, PSE certifications present in both). The 3JS 7-R carries CSA and cURus approvals, while the 0209007.MXEP carries cULus approval. Selection between these parts should be based on specific regulatory requirements of the target application and the availability of required certifications in the deployment region. Both parts are RoHS3 compliant and suitable for the specified operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can the 0209007.MXEP replace the 3JS 7-R in all applications?

A: The 0209007.MXEP matches all mandatory electrical and mechanical parameters (7A current rating, 350V AC, slow-blow response, 2AG package, through-hole mounting). However, verify that the specific certifications required by your application (CSA, cURus, or cULus) are acceptable for your deployment region before substitution.

Q: What is the significance of the different melting I²t values (263 vs. 464)?

A: Melting I²t represents the thermal energy required to melt the fuse element. The 0209007.MXEP has a higher melting I²t, which may affect response characteristics in edge-case current conditions. Confirm compatibility with your circuit protection requirements.

Q: Are the dimensional differences between the parts significant?

A: Both parts conform to the 2AG standard package (5mm x 15mm axial). The 0209007.MXEP has slightly smaller physical dimensions (0.185" Dia x 0.570" L vs. 0.217" Dia x 0.591" L). These variations remain within 2AG specification tolerances and do not affect mechanical compatibility in standard through-hole mounting applications.

Q: Why is the DC voltage rating not specified for the 0209007.MXEP?

A: The provided data for the 0209007.MXEP does not include a separate DC voltage rating specification. Verify DC performance requirements with the manufacturer if your application requires explicit 140V DC rating confirmation.

Q: Are both parts suitable for RoHS3 environments?

A: Yes, both the 3JS 7-R and 0209007.MXEP are RoHS3 compliant and suitable for applications requiring RoHS3 certification.