3JS 750-R Equivalent & Substitute Parts

Part Overview

The 3JS 750-R is a 750 mA slow-blow glass cartridge fuse manufactured by Bel Fuse Inc., rated for 350 V AC and 140 V DC operation. This component is designed for through-hole mounting in 2AG form factor (5mm x 15mm axial configuration). The part maintains active product status with full RoHS3 compliance and international certifications including CE, CSA, and cURus approval. Substitute parts are identified when equivalent current ratings, response characteristics, and mounting compatibility are maintained within specified voltage and mechanical tolerances.

Substiute Parts

3JS 750-R

Bel Fuse Inc.In Stock: 17783JS 750-R Datasheet

Current PartRFQ

0230.750MXP

Littelfuse Inc.In Stock: 19770230.750MXP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3JS 750-R is determined by the following criteria:

Primary Matching Parameters:

• Current Rating: 750 mA (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Slow Blow (exact match required)
• Mounting Type: Through Hole (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

Voltage Tolerance Parameters:

• AC Voltage Rating: Must be equal to or greater than 350 V
• DC Voltage Rating: Must be equal to or greater than 140 V

Mechanical Compatibility:

• Package form factor must support through-hole mounting in equivalent footprint dimensions
• Physical dimensions must be compatible with 2AG or equivalent non-standard cartridge configurations

The identified substitute 0230.750MXP from Littelfuse Inc. matches the primary electrical parameters (750 mA, slow-blow glass cartridge) and operating temperature range. However, this substitute operates at reduced voltage ratings (250 V AC, 125 V DC) and uses a non-standard cartridge package form factor with slightly different physical dimensions (4.50mm x 14.50mm versus 5.50mm x 15.00mm).

Parameter Comparison

Engineering Selection Recommendations

Primary Part (3JS 750-R): The 3JS 750-R is the specified component for applications requiring 350 V AC and 140 V DC rated protection. This part maintains active product status with full international certifications (CE, CSA, cURus) and is available in standard 2AG form factor. Selection of this part is appropriate for circuits operating at or near the specified voltage ratings.

Substitute Part (0230.750MXP): The 0230.750MXP substitute is suitable only for applications where circuit voltage ratings do not exceed 250 V AC and 125 V DC. This part carries equivalent RoHS3 compliance and CE/CSA/UL certifications. The non-standard cartridge package form factor requires mechanical compatibility assessment with the target application's fuse holder or mounting configuration. The reduced breaking capacity (35A AC versus 100A AC) and slightly lower melting I²t value (2.95 versus 3) indicate different fault current handling characteristics.

Frequently Asked Questions (FAQ)

Q: Can the 0230.750MXP be used as a direct replacement for the 3JS 750-R?

A: Direct replacement is not applicable. The 0230.750MXP operates at lower voltage ratings (250 V AC / 125 V DC versus 350 V AC / 140 V DC) and uses a non-standard cartridge package form factor. Substitution is only valid for applications where circuit voltage ratings remain below the substitute part's maximum ratings and the mechanical package is compatible with the fuse holder.

Q: What are the key electrical differences between these parts?

A: Both parts share identical 750 mA current ratings and slow-blow response characteristics. Primary differences include AC voltage rating (350 V versus 250 V), DC voltage rating (140 V versus 125 V), breaking capacity (100A AC / 150A DC versus 35A AC / 10kA DC), and DC cold resistance (0.28 Ohms versus 0.343 Ohms).

Q: Are both parts RoHS3 compliant?

A: Yes, both the 3JS 750-R and 0230.750MXP are RoHS3 compliant and carry equivalent environmental compliance status.

Q: What certifications apply to each part?

A: The 3JS 750-R carries CE, CSA, and cURus approvals. The 0230.750MXP carries CE, CSA, and UL approvals. Both meet international safety standards for their respective voltage and current ratings.

Q: How do the package dimensions affect substitution?

A: The 3JS 750-R uses standard 2AG form factor (5.50mm x 15.00mm). The 0230.750MXP uses a non-standard cartridge configuration (4.50mm x 14.50mm). Physical compatibility with the application's fuse holder or mounting socket must be confirmed before substitution.