2JQ 4 Equivalent & Substitute Parts

Part Overview

The 2JQ 4 is a fast-blow glass cartridge fuse rated at 4 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, making identification of active equivalent parts essential for ongoing system maintenance and component procurement. Substitute parts must maintain identical electrical ratings, mechanical dimensions, and approval certifications to ensure direct compatibility in existing fuse holder assemblies.

Substiute Parts

2JQ 4

Bel Fuse Inc.In Stock: 9432JQ 4 Datasheet

Current PartRFQ

2JQ 4-R

Bel Fuse Inc.In Stock: 27572JQ 4-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 2JQ 4 is determined by strict equivalence across the following parameters:

• Current Rating: 4 A (exact match required)
• Voltage Ratings: 350 V AC and 140 V DC (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Package / Case: 2AG, 5mm x 15mm (exact match required)
• Response Time: Fast Blow (exact match required)
• Breaking Capacity: 100A AC, 150A DC (exact match required)
• Melting I²t: 12 (exact match required)
• Approval Certifications: CE, CSA, cURus, PSE (all certifications must be present)

The 2JQ 4-R is a direct substitute manufactured by the same supplier, Bel Fuse Inc., with identical electrical and mechanical specifications. The primary distinction is product status: the 2JQ 4 is obsolete, while the 2JQ 4-R is active and available in bulk packaging.

Parameter Comparison

Engineering Selection Recommendations

The 2JQ 4-R is the direct active equivalent for the obsolete 2JQ 4. Both parts maintain identical electrical ratings, mechanical dimensions, and approval certifications required for 2AG fuse holder compatibility. The 2JQ 4-R offers improved compliance status (ROHS3 Compliant versus RoHS non-compliant) and marginally lower DC cold resistance (0.018 Ohms versus 0.02 Ohms), with no functional impact on circuit protection performance. For new designs or component replacement, the 2JQ 4-R is the specified substitute.

Frequently Asked Questions (FAQ)

Q: Can the 2JQ 4-R be used as a direct replacement for the 2JQ 4?

A: Yes. Both parts are identical in current rating (4 A), voltage ratings (350 V AC, 140 V DC), fuse type (cartridge, glass), package dimensions (2AG, 5mm x 15mm), response time (fast blow), breaking capacity, and approval certifications. The 2JQ 4-R is the active equivalent.

Q: What is the significance of the product status difference?

A: The 2JQ 4 is classified as obsolete, indicating it is no longer manufactured or supported by Bel Fuse Inc. The 2JQ 4-R is active and available in production quantities, making it the appropriate choice for procurement and system maintenance.

Q: Are there differences in RoHS compliance between these parts?

A: Yes. The 2JQ 4 is RoHS non-compliant, while the 2JQ 4-R is ROHS3 Compliant. For applications subject to RoHS regulations, the 2JQ 4-R is required.

Q: Does the DC cold resistance difference affect circuit performance?

A: The DC cold resistance values (0.02 Ohms for 2JQ 4 versus 0.018 Ohms for 2JQ 4-R) are negligible for fuse applications and do not impact circuit protection characteristics or compatibility.

Q: Will the 2JQ 4-R fit existing 2AG fuse holders?

A: Yes. Both parts conform to the 2AG form factor with identical dimensions (5mm x 15mm), ensuring mechanical compatibility with all standard 2AG fuse holder assemblies.