2JS 2.5-R Equivalent & Substitute Parts

Part Overview

The 2JS 2.5-R is a 2.5 A slow blow glass cartridge fuse manufactured by Bel Fuse Inc., rated for 350 V AC and 140 V DC operation. This fuse is designed for applications requiring reliable overcurrent protection in the 2AG form factor (5mm x 15mm). The part is currently active in production with 810 units in stock. Substitute parts are identified when equivalent current ratings, response characteristics, and mechanical compatibility are maintained within acceptable parameter tolerances.

Substiute Parts

2JS 2.5-R

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

Current PartRFQ

022902.5MXP

Littelfuse Inc.In Stock: 1055022902.5MXP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 2JS 2.5-R is determined by the following criteria:

• Current Rating: Must be 2.5 A (exact match required)
• Response Characteristic: Must be Slow Blow (exact match required)
• Fuse Type: Must be Cartridge, Glass (exact match required)
• Package / Case: Must be 2AG, 5mm x 15mm form factor (exact match required)
• Voltage Ratings: AC and DC voltage ratings must meet or exceed the application requirements
• Operating Temperature: Must support -55°C ~ 125°C range
• Compliance: Must maintain RoHS3 compliance and relevant agency approvals

The substitute part 022902.5MXP from Littelfuse Inc. meets the current rating, response time, fuse type, and mechanical package requirements. However, voltage ratings differ: the substitute provides 250 V AC and 125 V DC compared to the main part's 350 V AC and 140 V DC ratings.

Parameter Comparison

Engineering Selection Recommendations

Selection between the 2JS 2.5-R and 022902.5MXP must be based on circuit voltage requirements. The 2JS 2.5-R is suitable for applications operating at 350 V AC or 140 V DC. The 022902.5MXP is suitable for applications operating at 250 V AC or 125 V DC. Both parts maintain identical current ratings, response characteristics, and mechanical compatibility. Both are ROHS3 compliant and carry relevant international approvals. The choice between these parts depends on whether the application voltage requirements align with the rated specifications of each fuse.

Frequently Asked Questions (FAQ)

Q: Can the 022902.5MXP substitute for the 2JS 2.5-R in all applications?

A: No. The 022902.5MXP has lower voltage ratings (250 V AC / 125 V DC) compared to the 2JS 2.5-R (350 V AC / 140 V DC). Substitution is only valid for applications operating within the lower voltage specifications of the 022902.5MXP.

Q: Are both fuses mechanically compatible with the same holder?

A: Both fuses use the 2AG form factor (5mm x 15mm) and require a compatible 2AG holder. Physical dimensions differ slightly (2JS 2.5-R: 5.10mm x 13.80mm; 022902.5MXP: 4.50mm x 14.48mm), but both fit within 2AG holder specifications.

Q: What is the difference in melting I²t between these fuses?

A: The 2JS 2.5-R has a melting I²t of 35.3, while the 022902.5MXP has a melting I²t of 50. This indicates different thermal response characteristics under fault conditions, despite both being classified as slow blow fuses.

Q: Do both fuses carry the same certifications?

A: Both fuses are ROHS3 compliant and carry CE, CSA, and PSE approvals. The 022902.5MXP additionally carries UL approval, while the 2JS 2.5-R carries cURus approval.

Q: What is the significance of DC cold resistance differences?

A: The 2JS 2.5-R has a DC cold resistance of 0.045 Ohms, while the 022902.5MXP has 0.0502 Ohms. This minor difference reflects manufacturing variations and does not affect functional compatibility for standard overcurrent protection applications.