3JS 2.5 Equivalent & Substitute Parts

Part Overview

The 3JS 2.5 is a glass cartridge fuse rated at 2.5 A with 350 V AC and 140 V DC voltage ratings, designed for through-hole mounting in 2AG form factor (5mm x 15mm axial). This component is classified as obsolete, making identification of suitable substitutes essential for ongoing system maintenance and repair operations. The slow-blow response characteristic provides protection against transient overcurrent conditions while maintaining circuit continuity during normal operation.

Substiute Parts

3JS 2.5

Bel Fuse Inc.In Stock: 8913JS 2.5 Datasheet

Current PartRFQ

3JS 2.5-R

Bel Fuse Inc.In Stock: 17253JS 2.5-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3JS 2.5 is determined by strict equivalence across the following critical parameters:

• Current Rating: 2.5 A (exact match required)
• Voltage Ratings: 350 V AC and 140 V DC (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: 100A AC, 150A DC (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)
• Approval Agencies: CE, CSA, cURus, PSE (exact match required)

The 3JS 2.5-R meets all substitution criteria and is classified as an active product, providing a direct replacement path for the obsolete 3JS 2.5.

Parameter Comparison

Engineering Selection Recommendations

The 3JS 2.5-R is the direct substitute for the obsolete 3JS 2.5. Both components are manufactured by Bel Fuse Inc. and maintain identical electrical and mechanical specifications across all critical parameters. The 3JS 2.5-R carries active product status with current manufacturing support and improved regulatory compliance (ROHS3 Compliant versus RoHS non-compliant). All required approval agencies (CE, CSA, cURus, PSE) are maintained. The minor reduction in DC cold resistance (0.046 Ohms versus 0.065 Ohms) and melting I²t (35 versus 35.3) remain within acceptable engineering tolerances for direct substitution. Selection of the 3JS 2.5-R eliminates obsolescence risk while maintaining full functional and mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can the 3JS 2.5-R be used as a direct replacement for the 3JS 2.5?

A: Yes. The 3JS 2.5-R meets all electrical and mechanical specifications of the 3JS 2.5, including current rating, voltage ratings, fuse type, response time, package form factor, mounting type, breaking capacity, and operating temperature range. Both components carry identical approval certifications.

Q: What is the difference between the 3JS 2.5 and 3JS 2.5-R?

A: The primary differences are product status and regulatory compliance. The 3JS 2.5 is obsolete and RoHS non-compliant, while the 3JS 2.5-R is an active product with ROHS3 compliance. DC cold resistance is slightly lower (0.046 Ohms versus 0.065 Ohms) and melting I²t is marginally reduced (35 versus 35.3), both within acceptable substitution tolerances.

Q: Are the physical dimensions identical?

A: Yes. Both components use the 2AG form factor with dimensions of 5mm x 15mm (0.217" Dia x 0.591" L) and are designed for through-hole mounting.

Q: Do both parts carry the same regulatory approvals?

A: Yes. Both the 3JS 2.5 and 3JS 2.5-R carry CE, CSA, cURus, and PSE approvals.

Q: What packaging options are available?

A: The 3JS 2.5 is available in standard packaging, while the 3JS 2.5-R is supplied in bulk packaging.