Bel Fuse Inc. 2JS 750 Equivalent & Substitute Parts

Part Overview

The Bel Fuse Inc. 2JS 750 is a 750 mA slow-blow glass cartridge fuse rated for 350 V AC and 140 V DC operation. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing system support and new designs. The 2AG form factor (5mm x 15mm) with holder-based mounting remains a standard configuration in industrial and consumer electronics applications.

Substiute Parts

2JS 750

Bel Fuse Inc.In Stock: 9852JS 750 Datasheet

Current PartRFQ

2JS 750-R

Bel Fuse Inc.In Stock: 20252JS 750-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 2JS 750 is determined by strict equivalence across electrical and mechanical parameters. The substitute part must maintain identical current rating (750 mA), voltage ratings (350 V AC / 140 V DC), response time classification (slow blow), package form factor (2AG, 5mm x 15mm), breaking capacity, and thermal characteristics. The 2JS 750-R meets all these criteria as a direct equivalent manufactured by the same supplier, with the primary distinction being active product status and improved compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The 2JS 750-R is the direct equivalent for the obsolete 2JS 750. Both parts share identical electrical specifications and mechanical form factors. The 2JS 750-R offers the advantage of active product status, ensuring continued availability and supply chain reliability. Additionally, the 2JS 750-R carries ROHS3 compliance and cURus certification, providing enhanced regulatory alignment for new designs and system upgrades. The DC cold resistance differential (0.487 Ohms vs. 0.31 Ohms) does not affect substitution eligibility, as both values remain within acceptable operational parameters for this fuse category.

Frequently Asked Questions (FAQ)

Q: Can the 2JS 750-R be used as a direct replacement for the 2JS 750?

A: Yes. Both parts are electrically and mechanically equivalent, with identical current ratings (750 mA), voltage ratings (350 V AC / 140 V DC), response time (slow blow), and package form factor (2AG, 5mm x 15mm). The 2JS 750-R is the active production equivalent.

Q: What is the significance of the product status change from obsolete to active?

A: Active product status indicates ongoing manufacturing and supply availability. The 2JS 750-R ensures long-term component sourcing for maintenance, repairs, and new production runs without supply discontinuation risk.

Q: Are there compliance differences between the two parts?

A: The 2JS 750-R carries ROHS3 compliance and cURus certification, compared to the 2JS 750's RoHS non-compliance and UR certification. These certifications reflect current regulatory standards and may be required for new system designs or market-specific applications.

Q: Does the difference in DC cold resistance affect compatibility?

A: No. The DC cold resistance values (0.487 Ohms for 2JS 750 and 0.31 Ohms for 2JS 750-R) are both within acceptable operational ranges for this fuse type and do not impact substitution suitability.

Q: What holder is required for installation?

A: Both the 2JS 750 and 2JS 750-R require a 2AG fuse holder compatible with 5mm x 15mm cartridge fuses. Verify holder compatibility before installation.