2JS 2.5 Equivalent & Substitute Parts

Part Overview

The 2JS 2.5 is a slow-blow glass cartridge fuse manufactured by Bel Fuse Inc., rated for 2.5 A at 350 V AC and 140 V DC. This component requires a 2AG holder and is designed for applications requiring reliable overcurrent protection with delayed response characteristics. The main part (2JS 2.5) carries an obsolete product status, making identification of active equivalent parts essential for procurement and design continuity.

Substiute Parts

2JS 2.5

Bel Fuse Inc.In Stock: 8622JS 2.5 Datasheet

Current PartRFQ

2JS 2.5-R

Bel Fuse Inc.In Stock: 8432JS 2.5-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 2JS 2.5 is determined by strict equivalence across the following electrical and mechanical parameters:

• Current Rating: 2.5 A (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 (exact match required)
• Breaking Capacity @ Rated Voltage: 100A AC, 150A DC (exact match required)
• Melting I²t: 35.3 (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

The substitute part 2JS 2.5-R meets all these criteria and is manufactured by the same supplier (Bel Fuse Inc.), ensuring mechanical and electrical compatibility with existing 2AG holder installations.

Parameter Comparison

Engineering Selection Recommendations

The 2JS 2.5-R is the direct active equivalent for the obsolete 2JS 2.5. Both parts are manufactured by Bel Fuse Inc. and share identical electrical and mechanical specifications, including current rating, voltage ratings, response time, package dimensions, and thermal operating range.

The 2JS 2.5-R carries active product status and holds ROHS3 compliance, whereas the main part is obsolete and RoHS non-compliant. The 2JS 2.5-R maintains all required regulatory approvals (CE, CSA, cURus, PSE) necessary for continued operation in protected circuits.

For new designs or component replenishment, the 2JS 2.5-R is the appropriate selection. Both parts are compatible with 2AG fuse holders and require no modification to existing mechanical installations.

Frequently Asked Questions (FAQ)

Q: Can the 2JS 2.5-R be used as a direct replacement for the 2JS 2.5?

A: Yes. Both parts are electrically and mechanically identical across all specified parameters, including current rating, voltage ratings, response time, package dimensions, and thermal range. No circuit modifications are required.

Q: What is the difference between the 2JS 2.5 and 2JS 2.5-R?

A: The primary differences are product status and compliance. The 2JS 2.5 is obsolete and RoHS non-compliant. The 2JS 2.5-R is active and ROHS3 compliant. Electrically and mechanically, both parts are equivalent.

Q: Are both parts compatible with the same 2AG holder?

A: Yes. Both the 2JS 2.5 and 2JS 2.5-R use the 2AG package format with identical dimensions (5mm x 15mm), ensuring compatibility with existing holder installations.

Q: What regulatory approvals does the 2JS 2.5-R carry?

A: The 2JS 2.5-R holds CE, CSA, cURus, and PSE approvals, meeting international safety and performance standards for overcurrent protection devices.

Q: Is the DC cold resistance difference between the two parts significant?

A: The 2JS 2.5 has a DC cold resistance of 0.065 Ohms, while the 2JS 2.5-R has 0.045 Ohms. Both values fall within acceptable ranges for slow-blow glass cartridge fuses and do not affect functional compatibility in standard circuit applications.