Equivalent & Substitute Parts for 3JQ 3

Part Overview

The 3JQ 3 is a 3 A, 350 V AC / 140 V DC fast-blow glass cartridge fuse in 2AG package format (5mm × 15mm axial). Manufactured by Bel Fuse Inc., this component is classified as obsolete. Due to its obsolete status, equivalent substitute parts with active product status are necessary for new designs and ongoing procurement requirements. Substitute parts maintain electrical and mechanical compatibility while offering improved availability and compliance certifications.

Substiute Parts

3JQ 3

Bel Fuse Inc.In Stock: 8743JQ 3 Datasheet

Current PartRFQ

3JQ 3-R

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

DirectRFQ

BK/C517-3-R

Eaton - Electronics DivisionIn Stock: 1094BK/C517-3-R Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters:

• Current Rating: 3 A (exact match required)
• Voltage Rating - AC: 350 V (exact match required)
• Package / Case: 2AG, 5mm × 15mm (Axial) (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Fast Blow (exact match required)
• Mounting Type: Through Hole (exact match required)

Two substitute parts meet these criteria:

1. 3JQ 3-R (Bel Fuse Inc.) – Direct manufacturer equivalent with active product status
2. BK/C517-3-R (Eaton - Electronics Division) – Cross-manufacturer equivalent with active product status

Parameter Comparison

Engineering Selection Recommendations

3JQ 3-R (Bel Fuse Inc.) is the primary substitute. It maintains identical electrical specifications, mechanical dimensions, and operating temperature range as the main part. It carries active product status with improved RoHS3 compliance and expanded approval certifications (PSE added). This part is recommended for applications requiring direct compatibility with the original 3JQ 3 specification.

BK/C517-3-R (Eaton - Electronics Division) is a secondary substitute suitable for applications where cross-manufacturer sourcing is acceptable. It meets core electrical and mechanical requirements (3 A, 350 V AC, 2AG package, fast-blow response). However, DC voltage rating is not specified in available data, and physical dimensions show a minor length variation (15.20mm vs. 15.00mm). This part carries RoHS compliance and CSA/UR certifications. Verification of DC voltage capability and mechanical fit is necessary before selection for DC-rated circuits.

Frequently Asked Questions (FAQ)

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

A: Yes. The 3JQ 3-R maintains identical current rating (3 A), AC voltage rating (350 V), DC voltage rating (140 V), package format (2AG, 5mm × 15mm), response time (fast-blow), and operating temperature range (-55°C to 125°C). It is mechanically and electrically interchangeable.

Q: What is the difference between 3JQ 3-R and BK/C517-3-R?

A: Both are 3 A, 350 V AC fast-blow glass cartridge fuses in 2AG package. The 3JQ 3-R is manufactured by Bel Fuse Inc. and specifies 140 V DC rating. The BK/C517-3-R is manufactured by Eaton and does not specify DC voltage rating. Physical length differs slightly (15.00mm vs. 15.20mm). The 3JQ 3-R is recommended for direct replacement; BK/C517-3-R requires verification of DC capability and mechanical fit.

Q: Why is the main part 3JQ 3 marked as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The 3JQ 3-R (active status) is the manufacturer's current equivalent and is recommended for new designs and ongoing procurement.

Q: Are there compliance differences between the substitutes?

A: Yes. The 3JQ 3-R carries RoHS3 compliance and certifications from CE, CSA, cURus, and PSE. The BK/C517-3-R carries RoHS compliance with CSA and UR certifications. The 3JQ 3 is RoHS non-compliant. Select based on your application's regulatory requirements.

Q: Can BK/C517-3-R be used in DC circuits?

A: The BK/C517-3-R specification does not include DC voltage rating. Verification with the manufacturer is required before use in DC-rated applications. The 3JQ 3-R explicitly supports 140 V DC and is the recommended choice for DC circuits.

Q: What is the significance of the melting I²t values?

A: Melting I²t indicates the thermal energy required to melt the fuse element. The 3JQ 3 has I²t of 6.9, the 3JQ 3-R has 4.6, and the BK/C517-3-R has 5.87. These variations reflect different fuse element designs. For applications with specific I²t requirements, verify compatibility with your circuit protection design.