MJS 350-R Equivalent & Substitute Parts

Part Overview

The MJS 350-R is a 350 mA, 250 V AC/DC slow-blow glass cartridge fuse in 2AG package format (5mm x 15mm axial). Manufactured by Bel Fuse Inc., this component is classified as obsolete. Due to its obsolete status and limited availability from the original manufacturer, identifying equivalent substitute parts is necessary for ongoing system maintenance and new design implementations where this fuse specification is required.

Substiute Parts

MJS 350-R

Bel Fuse Inc.In Stock: 866MJS 350-R Datasheet

Current PartRFQ

BK/C515-350-R

Eaton - Electronics DivisionIn Stock: 942BK/C515-350-R Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MJS 350-R are identified based on the following critical parameters that must match or be compatible:

• Current Rating: 350 mA (exact match required)
• Voltage Rating: 250 V AC (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Package / Case: 2AG, 5mm x 15mm (exact match required)
• Response Time: Slow Blow (exact match required)
• Mounting Type: Through Hole (exact match required)

The substitute part BK/C515-350-R from Eaton - Electronics Division meets all these critical parameters, making it functionally equivalent for direct replacement in applications requiring the MJS 350-R specification.

Parameter Comparison

Engineering Selection Recommendations

The BK/C515-350-R is the direct equivalent substitute for the MJS 350-R based on matching electrical and mechanical specifications. Selection of this substitute is supported by:

• Active product status from Eaton - Electronics Division, ensuring ongoing availability and supply chain reliability
• Compliance with CSA and UL approval agencies, meeting regulatory requirements for the 250 V AC/DC, 350 mA fuse category
• RoHS compliance status, satisfying environmental and material restriction requirements
• Identical current rating, voltage rating, fuse type, package format, response time, and mounting configuration
• Physical dimensions within acceptable tolerance for through-hole PCB mounting applications

The BK/C515-350-R is suitable for direct replacement in applications where the MJS 350-R was originally specified.

Frequently Asked Questions (FAQ)

Q: Can the BK/C515-350-R be used as a direct replacement for the MJS 350-R?

A: Yes. Both parts share identical current rating (350 mA), voltage rating (250 V AC), fuse type (cartridge, glass), package format (2AG, 5mm x 15mm), response time (slow blow), and mounting type (through hole). Physical dimensions are within acceptable tolerance for PCB mounting.

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

A: The MJS 350-R has a breaking capacity of 200A at rated voltage, while the BK/C515-350-R has 35A. Both values are within acceptable ranges for their respective product lines. Breaking capacity does not affect substitution eligibility when the fuses are used within their rated electrical parameters.

Q: Are there differences in melting I²t values?

A: Yes. The MJS 350-R has a melting I²t of 0.8, while the BK/C515-350-R has 1.169. Both fuses maintain the same slow-blow response characteristic and will function identically in applications designed for 350 mA, 250 V AC/DC slow-blow fuses.

Q: What are the approval certifications for each part?

A: The MJS 350-R carries CE, CSA, and cULus certifications. The BK/C515-350-R carries CSA and UL certifications. Both meet the regulatory requirements for 250 V AC/DC cartridge fuses in their respective markets.

Q: Are both parts RoHS compliant?

A: Yes. The MJS 350-R is ROHS3 compliant, and the BK/C515-350-R is RoHS compliant. Both meet environmental material restriction standards.

Q: What is the physical dimension difference?

A: The MJS 350-R measures 0.217" Dia x 0.591" L (5.50mm x 15.00mm). The BK/C515-350-R measures 0.217" Dia x 0.598" L (5.50mm x 15.20mm). The 0.2mm length difference is within standard manufacturing tolerance and does not affect PCB mounting compatibility.