Equivalent & Substitute Parts for 3JQ 2-R Glass Fuse Cartridge

Part Overview

The 3JQ 2-R is a 2A fast-blow glass fuse cartridge manufactured by Bel Fuse Inc., rated for 350V AC and 140V DC operation. This through-hole component is designed for circuit protection in applications requiring reliable overcurrent interruption across a wide operating temperature range of -55°C to 125°C. The part maintains active product status with full RoHS3 compliance and multiple international certifications including CE, CSA, cURus, and PSE. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and application-specific voltage or performance requirements.

Substiute Parts

3JQ 2-R

Bel Fuse Inc.In Stock: 13503JQ 2-R Datasheet

Current PartRFQ

0224002.MXP

Littelfuse Inc.In Stock: 19140224002.MXP Datasheet

DirectRFQ

0208002.MXEP

Littelfuse Inc.In Stock: 19460208002.MXEP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3JQ 2-R is determined by the following critical parameters: current rating (2A), fuse type (cartridge glass), package format (2AG, 5mm x 15mm axial), response time (fast blow), mounting configuration (through hole), and operating temperature range (-55°C to 125°C). Voltage ratings and breaking capacity must meet or exceed the application requirements. The substitute parts identified maintain identical current ratings, package dimensions, and response characteristics while offering alternative voltage specifications and breaking capacity ratings suitable for different circuit protection scenarios.

Two substitute parts are qualified:

1. 0224002.MXP (Littelfuse Inc.) — Direct substitute with reduced AC voltage rating (250V AC vs. 350V AC) and reduced DC voltage rating (125V DC vs. 140V DC), but enhanced breaking capacity (10kA DC vs. 150A DC). Suitable for lower-voltage applications requiring higher fault current interruption capability.

2. 0208002.MXEP (Littelfuse Inc.) — Similar substitute with matching 350V AC rating but no specified DC voltage rating. Maintains 100A breaking capacity and identical package format. Suitable for AC-dominant applications.

Parameter Comparison

Engineering Selection Recommendations

0224002.MXP Selection Criteria: This Littelfuse substitute is appropriate for applications operating at 250V AC or lower and 125V DC or lower. The enhanced 10kA DC breaking capacity provides superior fault current handling compared to the original 3JQ 2-R. This part carries UL certification in addition to CE, CSA, and PSE approvals, expanding compliance coverage for North American markets. The lower melting I²t value (1.5 vs. 2.3) indicates faster thermal response, suitable for sensitive circuit protection requirements.

0208002.MXEP Selection Criteria: This Littelfuse substitute maintains the full 350V AC rating of the original part, making it directly compatible with high-voltage AC applications. The absence of a specified DC voltage rating restricts its use to AC-only circuits. This part carries CE and cURus certifications along with PSE approval. The matching 100A AC breaking capacity and identical package format ensure mechanical and electrical compatibility in AC-dominant protection schemes.

Primary Recommendation: For direct replacement in existing 350V AC / 140V DC circuits, the 3JQ 2-R remains the specified choice. For new designs or applications with lower voltage requirements, 0224002.MXP offers enhanced DC breaking capacity and broader certification coverage. For AC-only applications at 350V AC, 0208002.MXEP provides a compatible alternative.

Frequently Asked Questions (FAQ)

Q: Can 0224002.MXP be used in a 350V AC circuit? A: No. The 0224002.MXP is rated for 250V AC maximum. Using it in a 350V AC circuit exceeds its voltage rating and violates safe operating parameters.

Q: What is the significance of the melting I²t difference between these parts? A: Melting I²t (2.3 for 3JQ 2-R vs. 1.5 for substitutes) indicates the thermal energy required to melt the fuse element. Lower I²t values result in faster response to overcurrent conditions. The 3JQ 2-R provides slower thermal response, while substitutes respond more quickly.

Q: Are all three parts mechanically interchangeable? A: Yes, all three parts share identical 2AG package dimensions (5mm x 15mm axial) and through-hole mounting configuration, ensuring mechanical compatibility in standard fuse holders.

Q: Which substitute has the broadest certification coverage? A: The 0224002.MXP carries four certifications (CE, CSA, PSE, UL), including UL approval for North American applications. The original 3JQ 2-R carries CE, CSA, cURus, and PSE. The 0208002.MXEP carries CE, cURus, and PSE.

Q: Can 0208002.MXEP be used in DC circuits? A: No. The 0208002.MXEP does not specify a DC voltage rating and is intended for AC applications only. The 3JQ 2-R and 0224002.MXP are both rated for DC operation.

Q: What is the difference in DC cold resistance between these parts? A: The 3JQ 2-R has 0.041 Ohms DC cold resistance, while both Littelfuse substitutes have 0.0497 Ohms. This slight increase in resistance may affect voltage drop calculations in low-impedance circuits.