MJS 750 Equivalent & Substitute Parts

Part Overview

The MJS 750 is a 750 mA, 250 V AC/DC slow-blow glass cartridge fuse in 2AG package format (5mm x 15mm axial). Manufactured by Bel Fuse Inc., this through-hole fuse is designed for circuit protection applications requiring moderate current ratings and slow-blow response characteristics. The MJS 750 is currently listed as obsolete, making identification of compatible substitute parts essential for ongoing system maintenance and component sourcing.

Substiute Parts

MJS 750

Bel Fuse Inc.In Stock: 1039MJS 750 Datasheet

Current PartRFQ

MJS 750-R

Bel Fuse Inc.In Stock: 861MJS 750-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MJS 750 are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

• Current Rating: 750 mA (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Slow Blow (exact match required)
• Package / Case: 2AG, 5mm x 15mm (Axial) (exact match required)
• Mounting Type: Through Hole (exact match required)
• Breaking Capacity @ Rated Voltage: 200 A (exact match required)
• Melting I²t: 3 (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

The MJS 750-R meets all substitution criteria and is classified as a direct equivalent.

Parameter Comparison

Engineering Selection Recommendations

The MJS 750-R is the direct equivalent substitute for the obsolete MJS 750. Both parts share identical electrical and mechanical specifications across all critical parameters: 750 mA current rating, 250 V AC voltage rating, slow-blow response, 2AG package format, and 200 A breaking capacity.

The MJS 750-R offers additional advantages for new designs and system updates. It maintains active product status with current manufacturing support, whereas the MJS 750 is obsolete. The MJS 750-R achieves ROHS3 compliance compared to the non-compliant status of the original part, meeting modern regulatory requirements. Certification coverage includes CE, CSA, and cULus approvals, providing comprehensive international standards compliance.

The DC cold resistance of the MJS 750-R (0.31 Ohms) is lower than the MJS 750 (0.487 Ohms), representing an improvement in electrical performance characteristics while maintaining all functional equivalence.

Frequently Asked Questions (FAQ)

Q: Can the MJS 750-R be used as a direct replacement for the MJS 750?

A: Yes. The MJS 750-R is a direct equivalent substitute. All critical electrical parameters (current rating, voltage rating, response time, breaking capacity, and melting I²t) and mechanical specifications (package format, dimensions, and mounting type) are identical.

Q: What is the difference between the MJS 750 and MJS 750-R?

A: The primary differences are product status and compliance. The MJS 750 is obsolete, while the MJS 750-R is active. The MJS 750-R is ROHS3 compliant, whereas the MJS 750 is non-compliant. The MJS 750-R also features lower DC cold resistance (0.31 Ohms vs. 0.487 Ohms) and includes cULus certification in addition to CE and CSA approvals.

Q: Are there any compatibility concerns when substituting the MJS 750-R for the MJS 750?

A: No compatibility concerns exist. Both parts are 2AG cartridge fuses with identical through-hole mounting, physical dimensions (5mm x 15mm), and electrical ratings. Direct socket compatibility is assured.

Q: What certifications does the MJS 750-R carry?

A: The MJS 750-R holds CE, CSA, and cULus approvals, providing compliance with European, Canadian, and North American safety standards.

Q: Is the MJS 750-R RoHS compliant?

A: Yes. The MJS 750-R is ROHS3 compliant, meeting current environmental and material restriction requirements for electronic components.