2JS 750-R Equivalent & Substitute Parts

Part Overview

The 2JS 750-R is a slow-blow glass cartridge fuse manufactured by Bel Fuse Inc., rated at 750 mA with 350 V AC and 140 V DC voltage ratings. This fuse is designed for applications requiring reliable overcurrent protection in the 2AG form factor (5mm x 15mm). The part maintains active product status with 1952 units in current inventory. Equivalent and substitute parts are identified to support procurement flexibility, supply chain continuity, and application-specific voltage or performance requirements.

Substiute Parts

2JS 750-R

Bel Fuse Inc.In Stock: 20252JS 750-R Datasheet

Current PartRFQ

0229.750MXP

Littelfuse Inc.In Stock: 15150229.750MXP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 2JS 750-R is determined by the following critical parameters:

• Current Rating: Must be 750 mA (exact match required)
• Package / Case: Must be 2AG, 5mm x 15mm (mechanical and electrical compatibility)
• Response Time: Slow Blow characteristic (functional requirement)
• Fuse Type: Glass cartridge (form factor requirement)
• Voltage Ratings: AC and DC voltage ratings must meet or exceed application requirements
• Operating Temperature Range: Must support -55°C ~ 125°C or equivalent
• Regulatory Approvals: Must maintain CE, CSA, or equivalent certifications

The substitute part 0229.750MXP (Littelfuse Inc.) meets the current rating, package, response time, and fuse type requirements. However, voltage ratings are lower (250 V AC / 125 V DC versus 350 V AC / 140 V DC), making this part suitable only for applications with reduced voltage requirements.

Parameter Comparison

Engineering Selection Recommendations

The 2JS 750-R is the primary specification for applications requiring 750 mA protection at 350 V AC / 140 V DC with slow-blow response characteristics. This part carries active product status and maintains full regulatory compliance (CE, CSA, cURus).

The 0229.750MXP substitute is applicable only when application voltage requirements are reduced to 250 V AC / 125 V DC or lower. This part maintains active status and carries CE, CSA, and UL approvals. Selection of the substitute requires explicit confirmation that the lower voltage ratings are compatible with the target application.

Both parts are ROHS3 compliant and operate across the identical temperature range (-55°C ~ 125°C). The primary distinction is voltage rating and breaking capacity; the 2JS 750-R provides higher voltage margin and greater AC breaking capacity (100A versus 35A).

Frequently Asked Questions (FAQ)

Q: Can 0229.750MXP be used as a direct replacement for 2JS 750-R?

A: Direct replacement is not recommended without voltage verification. The 0229.750MXP has lower AC and DC voltage ratings (250 V AC / 125 V DC versus 350 V AC / 140 V DC). Use only if the application operates at or below the substitute's voltage ratings.

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

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

Q: What is the significance of the melting I²t difference?

A: The melting I²t value (3.04 for 2JS 750-R versus 2.95 for 0229.750MXP) indicates the thermal energy required to melt the fuse element. The 2JS 750-R requires slightly more energy, reflecting its higher voltage rating and breaking capacity design.

Q: Do both parts meet the same regulatory standards?

A: Both parts carry CE and CSA approvals. The 2JS 750-R includes cURus certification, while the 0229.750MXP includes UL certification. Both are acceptable for most industrial and commercial applications requiring these standards.

Q: What is the impact of DC cold resistance difference?

A: The DC cold resistance of 0229.750MXP (0.343 Ohms) is slightly higher than the 2JS 750-R (0.31 Ohms). This minor difference has negligible impact on circuit performance in typical applications but may be relevant in low-voltage, high-current circuits requiring precise resistance calculations.

Q: Are both parts RoHS compliant?

A: Yes. Both the 2JS 750-R and 0229.750MXP are ROHS3 compliant and REACH unaffected, meeting environmental regulatory requirements.