2JQ 3 Glass Fuse Equivalent & Substitute Parts

Part Overview

The 2JQ 3 is a fast-blow glass cartridge fuse rated at 3 A, 350 V AC, and 140 V DC, manufactured by Bel Fuse Inc. in the 2AG form factor (5mm x 15mm). This component is classified as obsolete, indicating that direct procurement from original inventory may become limited. Identifying equivalent substitute parts ensures design continuity and supply chain reliability for applications requiring this fuse specification.

Substiute Parts

2JQ 3

Bel Fuse Inc.In Stock: 9942JQ 3 Datasheet

Current PartRFQ

2JQ 3-R

Bel Fuse Inc.In Stock: 27342JQ 3-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The 2JQ 3-R qualifies as a direct substitute for the 2JQ 3 based on the following critical parameters:

• Current Rating: Both parts are rated at 3 A
• Voltage Ratings: Both maintain 350 V AC and 140 V DC specifications
• Fuse Type and Package: Both are fast-blow glass cartridge fuses in the 2AG form factor (5mm x 15mm)
• Mechanical Compatibility: Identical physical dimensions and holder requirements
• Thermal Range: Both operate across -55°C to 125°C
• Regulatory Approvals: Both carry CE, CSA, cURus, and PSE certifications

The 2JQ 3-R differs in product status (Active vs. Obsolete) and RoHS compliance (ROHS3 Compliant vs. non-compliant), making it the preferred long-term alternative for new designs and ongoing supply requirements.

Parameter Comparison

Engineering Selection Recommendations

The 2JQ 3-R is the appropriate substitute for the 2JQ 3 in all new designs and ongoing applications. The substitute maintains electrical and mechanical compatibility across all critical parameters: current rating, voltage specifications, form factor, and thermal operating range. Both parts carry identical regulatory approvals (CE, CSA, cURus, PSE), ensuring compliance in regulated applications.

The 2JQ 3-R offers the additional advantage of Active product status and ROHS3 compliance, supporting long-term supply chain stability and alignment with modern environmental regulations. The marginal difference in DC cold resistance (0.026 Ω vs. 0.027 Ω) and melting I²t (6.9 vs. 4.6) remains within acceptable engineering tolerances for standard circuit protection applications.

Frequently Asked Questions (FAQ)

Q: Can the 2JQ 3-R be used as a direct replacement for the 2JQ 3 in existing assemblies?

A: Yes. The 2JQ 3-R is mechanically and electrically compatible with the 2JQ 3. Both parts share identical current ratings (3 A), voltage specifications (350 V AC, 140 V DC), package dimensions (2AG, 5mm x 15mm), and holder requirements. No circuit modifications or mechanical adjustments are necessary.

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

A: The 2JQ 3 has a melting I²t of 6.9, while the 2JQ 3-R has a melting I²t of 4.6. This difference reflects variations in fuse element design but does not affect compatibility for standard circuit protection applications where both parts meet the same current and voltage ratings.

Q: Why is the 2JQ 3 classified as obsolete?

A: Obsolete status indicates that the 2JQ 3 is no longer in active production. The 2JQ 3-R, classified as Active, represents the current manufacturing equivalent and is the recommended choice for new designs and ongoing procurement.

Q: Are there any compliance differences between the two parts?

A: Both parts carry CE, CSA, cURus, and PSE certifications. The 2JQ 3-R is ROHS3 compliant, while the 2JQ 3 is RoHS non-compliant. For applications subject to RoHS requirements, the 2JQ 3-R is the appropriate selection.

Q: What is the DC cold resistance specification, and does the difference matter?

A: DC cold resistance is 0.026 Ω for the 2JQ 3 and 0.027 Ω for the 2JQ 3-R. This minimal difference (0.001 Ω) has negligible impact on circuit performance in standard fuse applications and does not affect substitution suitability.