2JQ 2 Equivalent & Substitute Parts

Part Overview

The 2JQ 2 is a fast-blow glass cartridge fuse rated at 2A, 350VAC/140VDC with a 2AG form factor (5mm x 15mm). Manufactured by Bel Fuse Inc., this component is designed for circuit protection in applications requiring rapid response to overcurrent conditions. The main part is currently listed as obsolete, making identification of active equivalent substitutes essential for ongoing system maintenance and new design implementations.

Substiute Parts

2JQ 2

Bel Fuse Inc.In Stock: 7352JQ 2 Datasheet

Current PartRFQ

2JQ 2-R

Bel Fuse Inc.In Stock: 25892JQ 2-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 2JQ 2 is determined by strict equivalence across electrical and mechanical parameters. The primary substitute, 2JQ 2-R, maintains identical specifications for current rating, voltage ratings (AC and DC), fuse type, response time, package dimensions, breaking capacity, and melting I²t value. Both parts are manufactured by Bel Fuse Inc. within the same 2JQ series, ensuring design compatibility.

The key substitution criteria are:

• Current Rating: 2 A (exact match required)
• Voltage Ratings: 350VAC / 140VDC (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Fast Blow (exact match required)
• Package / Case: 2AG, 5mm x 15mm (exact match required)
• Breaking Capacity: 100A AC, 150A DC (exact match required)
• Melting I²t: 2.3 (exact match required)

Parameter Comparison

Engineering Selection Recommendations

The 2JQ 2-R is the direct active substitute for the obsolete 2JQ 2. Both components are electrically and mechanically equivalent across all critical fuse parameters. The 2JQ 2-R offers the advantage of active product status, ensuring continued availability and supply chain reliability.

The 2JQ 2-R provides enhanced compliance posture with ROHS3 certification compared to the non-compliant status of the original 2JQ 2. Additional regulatory approval for PSE is included with the substitute part. The DC cold resistance differential (0.041 Ohms versus 0.044 Ohms) is within acceptable tolerance for fuse cartridge applications and does not affect functional equivalence.

For new designs or system replacements, the 2JQ 2-R should be specified. For legacy systems currently using the 2JQ 2, direct substitution with 2JQ 2-R is supported without circuit redesign or holder modification.

Frequently Asked Questions (FAQ)

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

A: Yes. The 2JQ 2-R is electrically and mechanically equivalent to the 2JQ 2 across all critical parameters including current rating, voltage ratings, response time, breaking capacity, and package dimensions. No circuit modifications or holder changes are required.

Q: What is the difference in DC cold resistance between the two parts?

A: The 2JQ 2 has a DC cold resistance of 0.044 Ohms, while the 2JQ 2-R measures 0.041 Ohms. This minor difference does not affect fuse operation or circuit protection performance.

Q: Why is the 2JQ 2 listed as obsolete?

A: The 2JQ 2 has reached end-of-life status. The 2JQ 2-R, as an active product from the same manufacturer and series, is the recommended replacement for continued supply and support.

Q: Are there compliance differences between the two parts?

A: The 2JQ 2-R includes ROHS3 compliance and PSE approval in addition to the CE, CSA, and cURus certifications shared with the 2JQ 2. The original 2JQ 2 is RoHS non-compliant. For applications requiring RoHS compliance, the 2JQ 2-R is the appropriate selection.

Q: Will the 2JQ 2-R fit in the same holder as the 2JQ 2?

A: Yes. Both parts use the identical 2AG form factor with 5mm x 15mm dimensions and require the same holder type. Physical installation is identical.

Q: What is the melting I²t specification and why is it important?

A: The melting I²t value of 2.3 defines the thermal energy required to melt the fuse element. Both the 2JQ 2 and 2JQ 2-R share this specification, ensuring identical response characteristics and protection behavior in circuit applications.