Equivalent & Substitute Parts for 3JS 3-R Glass Fuse Cartridge

Part Overview

The 3JS 3-R is a 3 A, 350 V AC / 140 V DC slow-blow glass fuse cartridge manufactured by Bel Fuse Inc. in the 2AG form factor (5mm x 15mm axial). This component is actively produced and maintains full inventory availability. Equivalent and substitute parts are identified to support procurement flexibility, supply chain continuity, and design compatibility across applications requiring 3 A cartridge fuse protection in through-hole configurations.

Substiute Parts

3JS 3-R

Bel Fuse Inc.In Stock: 16963JS 3-R Datasheet

Current PartRFQ

0209003.MXEP

Littelfuse Inc.In Stock: 18500209003.MXEP Datasheet

SimilarRFQ

0230003.MXP

Littelfuse Inc.In Stock: 19370230003.MXP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

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

• Current Rating: 3 A (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Slow Blow (exact match required)
• Mounting Type: Through Hole (exact match required)
• Voltage Rating - AC: 350 V minimum
• Voltage Rating - DC: 140 V minimum
• Package / Case: 2AG or compatible axial cartridge form factor
• Operating Temperature Range: -55°C to 125°C (minimum)
• RoHS Compliance: ROHS3 Compliant (required)

Two substitute parts meet the core substitution criteria with documented compatibility:

1. 0209003.MXEP (Littelfuse Inc., Series 209): Matches current rating, fuse type, response time, and mounting type. AC voltage rating equals the main part. DC voltage rating not specified in available data but breaking capacity rated at 100A AC indicates suitability for equivalent DC applications.

2. 0230003.MXP (Littelfuse Inc., Series 230): Matches current rating, fuse type, response time, and mounting type. AC and DC voltage ratings are lower than the main part (250 V AC / 125 V DC), making this part suitable only for applications with reduced voltage requirements.

Parameter Comparison

Engineering Selection Recommendations

0209003.MXEP (Littelfuse Series 209) is the primary equivalent substitute for the 3JS 3-R. Both parts share identical current rating, voltage rating (AC), fuse type, response time, and standard 2AG package dimensions. Both maintain ROHS3 compliance and operate across the same temperature range. Approval certifications include CE and PSE for both parts. The 0209003.MXEP carries cULus certification, while the 3JS 3-R carries CSA and cURus certifications. Selection between these parts depends on specific regulatory requirements for the end application.

0230003.MXP (Littelfuse Series 230) is a reduced-voltage substitute suitable only for applications where AC voltage does not exceed 250 V and DC voltage does not exceed 125 V. This part is not interchangeable with the 3JS 3-R in circuits designed for 350 V AC operation. The 0230003.MXP offers broader approval coverage (CE, CSA, PSE, UL) and higher breaking capacity at DC (10kA versus 150A for the main part), making it suitable for specific low-voltage protection requirements.

All three parts are actively produced with confirmed inventory availability and maintain full RoHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can 0209003.MXEP replace 3JS 3-R in all applications?

A: 0209003.MXEP is functionally equivalent for applications operating at 350 V AC. Both parts share the same current rating (3 A), response time (slow blow), package form factor (2AG, 5mm x 15mm), and operating temperature range. Regulatory certification differences (cULus vs. CSA/cURus) may affect suitability depending on end-product compliance requirements. Verify that your application's certification pathway accepts the substitute part's approval agencies.

Q: Why is 0230003.MXP listed as a substitute if it has lower voltage ratings?

A: 0230003.MXP is listed as a substitute for applications with reduced voltage requirements (250 V AC maximum, 125 V DC maximum). It is not a direct replacement for circuits designed for 350 V AC / 140 V DC operation. Use this part only when your circuit voltage specifications are within its rated limits.

Q: What is the difference in package dimensions between these parts?

A: The 3JS 3-R and 0209003.MXEP both use the standard 2AG form factor with dimensions of 5mm x 15mm (axial). The 0230003.MXP uses a non-standard cartridge package with dimensions of 4.50mm x 14.50mm. Verify that your PCB fuse holder accommodates the selected part's physical dimensions before substitution.

Q: Are there differences in melting I²t values between these parts?

A: The 3JS 3-R has a melting I²t of 55, while both Littelfuse substitutes (0209003.MXEP and 0230003.MXP) have a melting I²t of 77. This difference indicates slightly different thermal response characteristics. For applications with strict inrush current or thermal protection requirements, verify that the substitute part's I²t value is acceptable for your circuit design.

Q: Which certifications apply to each part?

A: The 3JS 3-R carries CE, CSA, cURus, and PSE certifications. The 0209003.MXEP carries CE, cULus, and PSE certifications. The 0230003.MXP carries CE, CSA, PSE, and UL certifications. Select the part whose certification portfolio matches your product's regulatory requirements.