MJS 6 Equivalent & Substitute Parts

Part Overview

The MJS 6 is a 6A 250VAC glass cartridge fuse in 2AG form factor (5mm x 15mm axial) manufactured by Bel Fuse Inc. This through-hole mounted slow-blow fuse is designed for circuit protection in AC and DC applications with a breaking capacity of 200A at rated voltage. The main part (MJS 6) carries an obsolete product status, making identification of active equivalent parts essential for ongoing design support and procurement.

Substiute Parts

MJS 6

Bel Fuse Inc.In Stock: 785MJS 6 Datasheet

Current PartRFQ

MJS 6-R

Bel Fuse Inc.In Stock: 778MJS 6-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MJS 6 is determined by strict equivalence across the following critical parameters:

• Current Rating: 6 A (exact match required)
• Voltage Rating: 250 V AC (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Package / Case: 2AG, 5mm x 15mm (Axial) (exact match required)
• Response Time: Slow Blow (exact match required)
• Breaking Capacity: 200A (exact match required)
• Melting I²t: 211 (exact match required)

The MJS 6-R variant meets all substitution criteria and is classified as an active product, providing a direct replacement path for the obsolete MJS 6.

Parameter Comparison

Engineering Selection Recommendations

The MJS 6-R is the direct active equivalent for the obsolete MJS 6. Both parts share identical electrical and mechanical specifications across all critical parameters: 6A current rating, 250V AC voltage rating, slow-blow response, 2AG glass cartridge form factor, and 200A breaking capacity.

The MJS 6-R offers improved compliance status: it carries ROHS3 compliance compared to the non-compliant MJS 6, and includes cULus certification in addition to CE and CSA approvals. The DC cold resistance of the MJS 6-R (0.014 Ohms) is marginally lower than the MJS 6 (0.015 Ohms), representing a negligible difference within normal manufacturing tolerances and presenting no functional impact on circuit protection performance.

For new designs and ongoing procurement, the MJS 6-R is the appropriate selection due to its active product status and enhanced regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can MJS 6-R be used as a direct replacement for MJS 6 in existing designs?

A: Yes. The MJS 6-R is electrically and mechanically identical to the MJS 6 across all critical parameters: current rating, voltage rating, fuse type, package dimensions, response time, and breaking capacity. Both are 6A 250VAC slow-blow glass cartridge fuses in 2AG form factor with identical thermal and electrical performance characteristics.

Q: What is the difference between MJS 6 and MJS 6-R?

A: The primary differences are product status and regulatory compliance. The MJS 6 is obsolete and RoHS non-compliant, while the MJS 6-R is an active product with ROHS3 compliance. The MJS 6-R also includes cULus certification. DC cold resistance differs marginally (0.014 Ohms vs. 0.015 Ohms), which is within normal manufacturing variation and does not affect circuit protection function.

Q: Are there packaging differences between MJS 6 and MJS 6-R?

A: Both parts use identical 2AG packaging (5mm x 15mm axial form factor) and are through-hole mounted. The MJS 6-R is supplied in bulk packaging, while the MJS 6 was supplied in standard packaging. Physical dimensions and mounting characteristics are identical.

Q: What certifications apply to the MJS 6-R?

A: The MJS 6-R carries CE, CSA, and cULus approvals. The original MJS 6 carried CE, CSA, and UL approvals. Both meet international safety standards for fuse components.

Q: Is the MJS 6-R suitable for both AC and DC applications?

A: Yes. The MJS 6-R is rated for 250V AC and is suitable for both AC and DC circuit protection applications within the specified voltage and current parameters.