Equivalent & Substitute Parts for 3JS 1.5-R

Part Overview

The 3JS 1.5-R is a 1.5 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 is designed for applications requiring reliable overcurrent protection in industrial and consumer electronics. The part maintains active product status with 1635 units in current inventory. Substitute parts are identified to address supply chain continuity, regional availability, or specific application requirements while maintaining equivalent electrical and mechanical performance.

Substiute Parts

3JS 1.5-R

Bel Fuse Inc.In Stock: 16613JS 1.5-R Datasheet

Current PartRFQ

020901.5MXEP

LittelfuseIn Stock: 3045020901.5MXEP Datasheet

SimilarRFQ

023001.5MXP

Littelfuse Inc.In Stock: 3418023001.5MXP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3JS 1.5-R is determined by the following critical parameters:

• Current Rating: Must be 1.5 A
• Voltage Rating - AC: Must be ≥ 350 V
• Voltage Rating - DC: Must be ≥ 140 V
• Fuse Type: Must be Cartridge, Glass
• Response Time: Must be Slow Blow
• Mounting Type: Must be Through Hole
• Melting I²t: Must be 15
• Operating Temperature Range: Must support -55°C ~ 125°C
• RoHS Compliance: Must be ROHS3 Compliant

Two substitute parts are identified from the Littelfuse product line. The 020901.5MXEP meets all critical electrical parameters with equivalent AC voltage rating and matching current/response characteristics. The 023001.5MXP shares the same current rating and response time but operates at reduced voltage levels (250 V AC, 125 V DC), making it suitable only for applications with lower voltage requirements.

Parameter Comparison

Engineering Selection Recommendations

The 020901.5MXEP from Littelfuse Series 209 is the primary substitute for the 3JS 1.5-R. Both parts share identical current ratings, AC voltage ratings, response characteristics, and melting I²t values. Physical dimensions are comparable within standard 2AG cartridge specifications. Both maintain ROHS3 compliance and support the full operating temperature range. Regulatory approvals overlap significantly (CE, PSE), with the substitute offering cULus certification in place of CSA and cURus certifications on the original part.

The 023001.5MXP from Littelfuse Series 230 is a secondary substitute applicable only to applications operating at reduced voltage levels (250 V AC maximum, 125 V DC maximum). This part is not suitable for circuits designed for the full 350 V AC / 140 V DC rating of the 3JS 1.5-R. The non-standard cartridge package may require mechanical accommodation verification. This substitute offers UL certification in addition to CE and PSE approvals.

Frequently Asked Questions (FAQ)

Q: Can the 020901.5MXEP directly replace the 3JS 1.5-R in all applications?

A: The 020901.5MXEP meets the critical electrical parameters (1.5 A current, 350 V AC, slow-blow response, 15 melting I²t). Physical dimensions are within standard 2AG specifications. Verify that your circuit design does not depend on the specific DC voltage rating or the particular regulatory certifications (CSA, cURus) of the original part.

Q: What is the difference between the 020901.5MXEP and 023001.5MXP substitutes?

A: The 020901.5MXEP maintains the full 350 V AC rating of the original part and is suitable for equivalent high-voltage applications. The 023001.5MXP operates at 250 V AC and 125 V DC, making it suitable only for lower-voltage circuits. The 023001.5MXP also uses a non-standard cartridge package rather than the standard 2AG form factor.

Q: Are there any physical dimension differences between these fuses?

A: The 3JS 1.5-R and 020901.5MXEP both use the standard 2AG package (5mm x 15mm). Minor dimensional variations exist (3JS: 5.50mm x 15.00mm; 020901.5MXEP: 4.70mm x 14.48mm), but both fit standard 2AG fuse holders. The 023001.5MXP uses a non-standard cartridge package (4.50mm x 14.50mm) and may not be mechanically compatible with standard 2AG holders.

Q: Which regulatory certifications should I verify for my application?

A: The 3JS 1.5-R carries CE, CSA, cURus, and PSE approvals. The 020901.5MXEP carries CE, cULus, and PSE approvals. If your application specifically requires CSA or cURus certification, verify that cULus certification on the substitute meets your regulatory requirements. The 023001.5MXP adds UL certification to the CE and PSE approvals.

Q: What is the significance of the melting I²t value of 15?

A: The melting I²t of 15 defines the thermal energy required to melt the fuse element. All three parts share this value, ensuring equivalent thermal response characteristics and trip times under overcurrent conditions. This parameter is critical for circuit protection coordination.

Q: How do the DC cold resistance values affect substitution?

A: The 3JS 1.5-R has a DC cold resistance of 0.094 Ohms, while both Littelfuse substitutes measure 0.1077 Ohms. This minor difference (approximately 14% higher on substitutes) may introduce negligible voltage drop variations in low-impedance circuits. Verify that your application tolerates this resistance variation.