3JS 750 Equivalent & Substitute Parts

Part Overview

The 3JS 750 is a 750 mA slow-blow glass cartridge fuse rated for 350 V AC and 140 V DC operation. It features a 2AG form factor with 5mm x 15mm axial dimensions and is designed for through-hole mounting applications. The main part (3JS 750) is classified as obsolete, making identification of active equivalent parts essential for ongoing system support and component procurement.

Substiute Parts

3JS 750

Bel Fuse Inc.In Stock: 9863JS 750 Datasheet

Current PartRFQ

3JS 750-R

Bel Fuse Inc.In Stock: 17783JS 750-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3JS 750 is determined by strict equivalence across the following critical parameters:

• Current Rating: 750 mA (exact match required)
• Voltage Rating - AC: 350 V (exact match required)
• Voltage Rating - DC: 140 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)
• Breaking Capacity @ Rated Voltage: 100A AC, 150A DC (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

The 3JS 750-R is a direct substitute manufactured by Bel Fuse Inc. under the same series designation. It maintains identical electrical and mechanical specifications while offering improved product status and compliance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The 3JS 750-R is the direct active equivalent for the obsolete 3JS 750. Both parts maintain identical electrical performance and mechanical compatibility. The 3JS 750-R offers the following advantages:

• Active product status ensures ongoing availability and manufacturer support
• ROHS3 compliance aligns with current environmental regulations
• Maintained certifications (CE, CSA, cURus) confirm continued regulatory approval

Selection of the 3JS 750-R is appropriate for all applications previously specified for the 3JS 750, with no functional or performance trade-offs.

Frequently Asked Questions (FAQ)

Q: Can the 3JS 750-R be used as a direct replacement for the 3JS 750?

A: Yes. The 3JS 750-R is electrically and mechanically identical to the 3JS 750 across all critical parameters: current rating, voltage ratings, fuse type, response time, package dimensions, and breaking capacity. Direct substitution is valid.

Q: What is the difference between the 3JS 750 and 3JS 750-R?

A: The primary differences are product status and compliance. The 3JS 750 is obsolete, while the 3JS 750-R is active. The 3JS 750-R is ROHS3 compliant, whereas the 3JS 750 is non-compliant. Electrical and mechanical specifications are identical.

Q: Are there any packaging differences between these parts?

A: The physical package and form factor are identical (2AG, 5mm x 15mm axial, through-hole mounting). The main packaging difference is that the 3JS 750-R is supplied in bulk packaging, while the 3JS 750 was supplied in standard packaging.

Q: What certifications apply to the 3JS 750-R?

A: The 3JS 750-R carries CE, CSA, and cURus certifications. The original 3JS 750 also included PSE certification, which is not listed for the substitute.

Q: Is the 3JS 750-R suitable for both AC and DC applications?

A: Yes. The 3JS 750-R is rated for 350 V AC and 140 V DC operation, matching the specifications of the original 3JS 750. It is suitable for both AC and DC circuit protection applications within these voltage limits.