2JS 500-R Equivalent & Substitute Parts

Part Overview

The 2JS 500-R is a 500 mA slow-blow glass cartridge fuse manufactured by Bel Fuse Inc., rated for 350 V AC and 140 V DC operation. It is housed in a 2AG form factor (5mm x 15mm) and requires a compatible fuse holder for installation. The product is currently active and widely stocked, with 1818 units available in inventory. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances for this fuse category.

Substiute Parts

2JS 500-R

Bel Fuse Inc.In Stock: 18602JS 500-R Datasheet

Current PartRFQ

0229.500MXP

Littelfuse Inc.In Stock: 11360229.500MXP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 2JS 500-R is determined by the following critical parameters:

• Current Rating: Must be 500 mA to ensure proper circuit protection
• Fuse Type & Package: Must be cartridge glass fuse in 2AG form factor (5mm x 15mm) for mechanical compatibility with existing holders
• Response Time: Must be slow-blow to match the original protection profile
• Voltage Ratings: AC and DC voltage ratings must meet or exceed the application requirements (350 V AC / 140 V DC minimum)
• Operating Temperature: Must support the -55°C ~ 125°C range
• Regulatory Compliance: Must maintain equivalent approval agency certifications

The substitute part 0229.500MXP from Littelfuse Inc. meets the current rating, fuse type, package, response time, and temperature range requirements. However, voltage ratings are lower (250 V AC / 125 V DC), which restricts its use to applications with reduced voltage demands.

Parameter Comparison

Engineering Selection Recommendations

Primary Part (2JS 500-R): Use for applications requiring 350 V AC / 140 V DC rated protection. This part is active, widely available (1818 units in stock), and carries CSA and cURus approvals suitable for North American markets.

Substitute Part (0229.500MXP): Use only in applications where the circuit voltage does not exceed 250 V AC or 125 V DC. This part is also active and in stock (1053 units), with broader regulatory coverage (CE, CSA, UL). The lower voltage rating restricts its application scope but provides additional international compliance certifications.

Both parts are ROHS3 compliant and operate across the same temperature range. Selection between them depends on the specific voltage requirements of the target application and regional certification needs.

Frequently Asked Questions (FAQ)

Q: Can the 0229.500MXP substitute for the 2JS 500-R in all applications?

A: No. The 0229.500MXP has lower voltage ratings (250 V AC / 125 V DC versus 350 V AC / 140 V DC). It is suitable only for circuits operating at or below these voltage levels. Applications requiring the full 350 V AC / 140 V DC rating must use the 2JS 500-R.

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

A: Yes. Both parts use the 2AG form factor (5mm x 15mm) and require the same holder type. Physical installation is interchangeable.

Q: What is the difference in breaking capacity between these parts?

A: The 2JS 500-R has a breaking capacity of 100A AC and 150A DC at rated voltage. The 0229.500MXP has 35A AC and 10kA DC at its rated voltage. Breaking capacity indicates the maximum fault current the fuse can safely interrupt. The 2JS 500-R is rated for higher AC fault currents, while the 0229.500MXP is rated for higher DC fault currents.

Q: Do both parts have the same response time?

A: Yes. Both are slow-blow fuses, meaning they tolerate temporary inrush currents before opening. This characteristic is identical between the two parts.

Q: Which certifications apply to each part?

A: The 2JS 500-R carries CSA and cURus approvals. The 0229.500MXP carries CE, CSA, and UL approvals. Selection depends on regional regulatory requirements for your application.

Q: What is the melting I²t value and why does it differ?

A: Melting I²t (1.6 for 2JS 500-R, 1.16 for 0229.500MXP) is a thermal characteristic indicating the energy required to melt the fuse element. The difference reflects different fuse element designs and contributes to the different breaking capacities and voltage ratings between the two parts.