Equivalent & Substitute Parts for 3JQ 3-R Glass Cartridge Fuse

Part Overview

The 3JQ 3-R is a 3 A, 350 V AC / 140 V DC fast-blow glass cartridge fuse manufactured by Bel Fuse Inc. in 2AG package format (5mm x 15mm axial). This component is designed for circuit protection in applications requiring fast response characteristics and is currently in active production status. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when inventory constraints require component alternatives that maintain equivalent electrical and mechanical performance within specified parameters.

Substiute Parts

3JQ 3-R

Bel Fuse Inc.In Stock: 10903JQ 3-R Datasheet

Current PartRFQ

0208003.MXEP

Littelfuse Inc.In Stock: 15750208003.MXEP Datasheet

SimilarRFQ

0224003.MXP

Littelfuse Inc.In Stock: 18090224003.MXP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 3JQ 3-R are identified based on the following critical parameters that determine functional equivalence:

• Current Rating: 3 A (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Package / Case: 2AG, 5mm x 15mm (Axial) (exact match required)
• Response Time: Fast Blow (exact match required)
• Voltage Rating - AC: 350 V minimum (equal or higher acceptable)
• Voltage Rating - DC: 140 V minimum (equal or higher acceptable)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)
• Mounting Type: Through Hole (exact match required)

Two substitute parts meet these criteria:

0208003.MXEP (Littelfuse Inc., Series 208): Matches all critical parameters with 350 V AC rating and fast-blow response. DC voltage rating not specified in provided data but AC rating matches primary specification.

0224003.MXP (Littelfuse Inc., Series 224): Matches all critical parameters with 250 V AC and 125 V DC ratings. Voltage ratings are lower than the primary part but remain within acceptable substitution range for applications not requiring the full 350 V AC / 140 V DC capability.

Parameter Comparison

Engineering Selection Recommendations

0208003.MXEP (Littelfuse Series 208): This substitute provides the closest electrical equivalence to the 3JQ 3-R, matching the 350 V AC rating and fast-blow response characteristics. All three manufacturers (Bel Fuse, Littelfuse) maintain active production status. Compliance certifications include CE, cURus, and PSE. This part is suitable for direct substitution in applications requiring 350 V AC operation.

0224003.MXP (Littelfuse Series 224): This substitute operates at reduced voltage ratings (250 V AC / 125 V DC) compared to the primary part. Selection of this part is appropriate only for applications where the circuit voltage does not exceed 250 V AC or 125 V DC. This part carries expanded compliance certifications including CE, CSA, PSE, and UL, and provides higher DC breaking capacity (10kA DC) compared to the primary part (150A DC). All three parts maintain ROHS3 compliance and active production status.

Frequently Asked Questions (FAQ)

Q: Can 0208003.MXEP be used as a direct replacement for 3JQ 3-R?

A: Yes. Both parts share identical current rating (3 A), voltage rating (350 V AC), response time (fast blow), package format (2AG, 5mm x 15mm), operating temperature range (-55°C ~ 125°C), and mounting type (through hole). Physical dimensions differ slightly (0.185" Dia x 0.570" L vs. 0.217" Dia x 0.591" L), but both conform to 2AG package specifications and are mechanically compatible with standard 2AG fuse holders.

Q: When should 0224003.MXP be selected instead of the primary part?

A: The 0224003.MXP is appropriate for applications where circuit voltage does not exceed 250 V AC or 125 V DC. This part should not be used in circuits designed for the full 350 V AC / 140 V DC capability of the 3JQ 3-R. Selection depends on actual circuit voltage requirements, not on the availability of higher-rated alternatives.

Q: Are there physical compatibility issues between these substitute parts and 2AG fuse holders?

A: All three parts conform to the 2AG package standard (5mm x 15mm axial). Minor dimensional variations exist (0208003.MXEP and 0224003.MXP measure 4.70mm diameter vs. 5.50mm for the 3JQ 3-R), but these fall within 2AG tolerance specifications and are compatible with standard 2AG through-hole fuse holders.

Q: What is the difference in melting I²t between these parts?

A: The 3JQ 3-R has a melting I²t of 4.6, while both Littelfuse substitutes (0208003.MXEP and 0224003.MXP) have a melting I²t of 4.62. This difference is negligible and does not affect functional equivalence for circuit protection applications.

Q: Do all three parts carry the same regulatory certifications?

A: No. The 3JQ 3-R carries CE, CSA, cURus, and PSE certifications. The 0208003.MXEP carries CE, cURus, and PSE. The 0224003.MXP carries CE, CSA, PSE, and UL. Application requirements determine which certifications are necessary for your specific use case.