2JS 4-R Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The 2JS 4-R is a 4A slow-blow glass cartridge fuse manufactured by Bel Fuse Inc., rated for 350V AC and 140V DC operation. This component is classified as Active product status and is designed for applications requiring reliable overcurrent protection in industrial and commercial equipment. The 2AG package format (5mm x 15mm) requires a compatible fuse holder for installation. Substitute parts are identified when equivalent electrical ratings, mechanical dimensions, and approval certifications align with the original specification.

Substiute Parts

2JS 4-R

Bel Fuse Inc.In Stock: 27752JS 4-R Datasheet

Current PartRFQ

0209004.MXP

Littelfuse Inc.In Stock: 27740209004.MXP Datasheet

SimilarRFQ

0229004.MXP

Littelfuse Inc.In Stock: 18550229004.MXP Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 2JS 4-R are identified based on the following critical parameters:

• Current Rating: 4 A (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Package / Case: 2AG, 5mm x 15mm (exact match required)
• Response Time: Slow Blow (exact match required)
• Mounting Type: Requires Holder (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)
• Approval Agencies: CE, CSA, cURus, PSE certifications

The following parts meet these substitution criteria:

• 0209004.MXP (Littelfuse Inc., Series 209)
• 0229004.MXP (Littelfuse Inc., Series 229)

Parameter Comparison

Engineering Selection Recommendations

0209004.MXP (Littelfuse Series 209): This substitute maintains the 350V AC rating and 4A current specification. It is certified by CE, cULus, and PSE. The melting I²t value of 148 differs from the original 86, and DC voltage rating is not specified in available data. This part is suitable for applications where 350V AC operation is the primary requirement and DC voltage specification is not critical.

0229004.MXP (Littelfuse Series 229): This substitute is rated for 125V AC/DC operation, which is lower than the original 350V AC and 140V DC ratings. It carries the broadest approval certifications including CE, CSA, PSE, and UL. The breaking capacity of 400A exceeds the original specification. This part is suitable only for applications operating at 125V or lower and where the higher breaking capacity provides additional margin.

Selection between substitutes depends on the actual voltage requirements of the target application. The 2JS 4-R original specification must be verified against circuit voltage before substitution.

Frequently Asked Questions (FAQ)

Q: Can 0209004.MXP be used as a direct replacement for 2JS 4-R?

A: 0209004.MXP matches the 350V AC rating, 4A current, 2AG package, and slow-blow response time. However, the DC voltage rating is not specified for this part, and the melting I²t differs (148 vs. 86). Verification against circuit requirements is necessary.

Q: What is the key difference between 0209004.MXP and 0229004.MXP?

A: The primary difference is voltage rating. 0209004.MXP is rated 350V AC, while 0229004.MXP is rated 125V AC/DC. Both share the same 4A current rating and 2AG package format. 0229004.MXP has a higher breaking capacity (400A vs. 100A).

Q: Can 0229004.MXP replace 2JS 4-R in a 350V AC circuit?

A: No. 0229004.MXP is rated for 125V AC maximum. Using it in a 350V AC circuit exceeds its voltage rating and creates a safety hazard.

Q: Are all three parts mechanically compatible with the same fuse holder?

A: Yes. All three parts use the 2AG package format (5mm x 15mm) and require a compatible 2AG fuse holder. Physical installation is interchangeable.

Q: What certifications are common across all three parts?

A: CE and PSE certifications are present on all three parts. CSA and cURus certifications are on the original 2JS 4-R. UL certification is on 0229004.MXP only.