3JS 2.5-R Equivalent & Substitute Parts

Part Overview

The 3JS 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 through-hole component features a 2AG form factor with dimensions of 5mm x 15mm and is designed for applications requiring reliable overcurrent protection in industrial and commercial equipment. The part maintains Active product status with full compliance to CE, CSA, cURus, and PSE approval agencies. Identifying equivalent substitute parts is necessary to ensure supply chain continuity, optimize inventory management, and maintain design flexibility across manufacturing environments.

Substiute Parts

3JS 2.5-R

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

Current PartRFQ

023002.5MXP

Littelfuse Inc.In Stock: 2178023002.5MXP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The 023002.5MXP from Littelfuse Inc. is identified as a substitute for the 3JS 2.5-R based on the following alignment criteria:

Matching Parameters:

• Current Rating: 2.5 A (identical)
• Response Time: Slow Blow (identical)
• Fuse Type: Cartridge, Glass (identical)
• Mounting Type: Through Hole (identical)
• Operating Temperature Range: -55°C ~ 125°C (identical)
• RoHS Status: ROHS3 Compliant (identical)

Differing Parameters:

• Voltage Rating - AC: 250 V (vs. 350 V on main part)
• Voltage Rating - DC: 125 V (vs. 140 V on main part)
• Package / Case: Cartridge, Non-Standard (vs. 2AG standard form factor)
• Physical Dimensions: 4.50mm x 14.50mm (vs. 5.50mm x 15.00mm)
• Breaking Capacity: 35A AC, 10kA DC (vs. 100A AC, 150A DC)

Substitution is valid only in applications where the lower voltage ratings and breaking capacity of the 023002.5MXP are acceptable for the intended circuit design.

Parameter Comparison

Engineering Selection Recommendations

Both the 3JS 2.5-R and 023002.5MXP maintain Active product status and comply with major international safety standards. The 3JS 2.5-R provides higher voltage ratings (350 V AC / 140 V DC) and greater breaking capacity (100A AC / 150A DC), making it suitable for high-voltage and high-fault-current applications. The 023002.5MXP offers lower voltage ratings (250 V AC / 125 V DC) with reduced breaking capacity (35A AC / 10kA DC), appropriate for lower-voltage circuit protection scenarios. Selection between these parts must be based on the specific voltage and fault-current requirements of the target application. Both parts carry ROHS3 compliance and maintain equivalent operating temperature ranges, ensuring environmental and regulatory alignment across substitution scenarios.

Frequently Asked Questions (FAQ)

Q: Can the 023002.5MXP replace the 3JS 2.5-R in all applications?

A: No. The 023002.5MXP has lower voltage ratings (250 V AC / 125 V DC versus 350 V AC / 140 V DC) and reduced breaking capacity. Substitution is valid only in circuits where these lower ratings meet the design requirements.

Q: What is the significance of the package form factor difference?

A: The 3JS 2.5-R uses the standard 2AG form factor (5mm x 15mm), while the 023002.5MXP uses a non-standard cartridge form factor (4.50mm x 14.50mm). Physical dimensions may affect mechanical fit in fuse holders and mounting hardware. Verify mechanical compatibility before substitution.

Q: Are both parts RoHS compliant?

A: Yes. Both the 3JS 2.5-R and 023002.5MXP are ROHS3 compliant and meet environmental regulatory requirements.

Q: What approval agencies certify each part?

A: The 3JS 2.5-R carries CE, CSA, cURus, and PSE approvals. The 023002.5MXP carries CE, CSA, PSE, and UL approvals. Both meet major international safety standards, though specific agency requirements may vary by application region.

Q: How do the breaking capacities differ?

A: The 3JS 2.5-R has a breaking capacity of 100A AC and 150A DC. The 023002.5MXP has a breaking capacity of 35A AC and 10kA DC. Applications with high fault currents require the higher breaking capacity of the 3JS 2.5-R.