Equivalent & Substitute Parts for 3AG 2 Glass Cartridge Fuse

Part Overview

The 3AG 2 is a 2 A, 250 V AC/DC fast-blow glass cartridge fuse manufactured by Bel Fuse Inc. in the 3AG series. This component is classified as obsolete, which necessitates identification of active equivalent alternatives for ongoing system support and procurement. The fuse is designed for use with 3AB and 3AG holders and meets multiple international approval standards including CE, CSA, PSE, and UL certifications.

Substiute Parts

3AG 2

Bel Fuse Inc.In Stock: 11043AG 2 Datasheet

Current PartRFQ

3AG 2-R

Bel Fuse Inc.In Stock: 37393AG 2-R Datasheet

DirectRFQ

0034.5131

SCHURTER Inc.In Stock: 16900034.5131 Datasheet

Parametric EquivalentRFQ

FSA-2A

OptiFuseIn Stock: 4253FSA-2A Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3AG 2 fuse is determined by strict equivalence across the following critical parameters:

• Current Rating: 2 A (exact match required)
• Voltage Rating: 250 V AC (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Fast Blow (exact match required)
• Physical Package: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
• Mounting Configuration: Requires Holder (exact match required)

All identified substitute parts meet these criteria. The primary distinction between substitutes is product status (active vs. obsolete) and compliance certifications. Breaking capacity and melting I²t values may vary within acceptable engineering tolerances for the same current and voltage ratings.

Parameter Comparison

Engineering Selection Recommendations

For new designs and ongoing procurement, the 3AG 2-R (Bel Fuse Inc.) is the primary recommended substitute. This part maintains identical electrical and mechanical specifications to the original 3AG 2 while offering active product status and ROHS3 compliance. The 3AG 2-R is manufactured by the same supplier as the original component, ensuring consistency in design and performance characteristics.

The FSA-2A (OptiFuse) is an alternative substitute with active product status and ROHS3 compliance. This part meets all critical electrical and mechanical parameters. The FSA-2A has a lower breaking capacity (100 A vs. 200 A) and higher melting I²t (8.57 vs. 7.2), which may be acceptable depending on circuit protection requirements.

The 0034.5131 (SCHURTER Inc.) is a parametric equivalent with ROHS3 compliance but carries obsolete product status, limiting its suitability for new procurement despite meeting all electrical and mechanical specifications.

Frequently Asked Questions (FAQ)

Q: Can the 3AG 2-R directly replace the 3AG 2 in existing applications?

A: Yes. The 3AG 2-R is a direct substitute with identical current rating (2 A), voltage rating (250 V), fuse type (cartridge, glass), response time (fast blow), and physical package (3AB, 3AG, 1/4" x 1-1/4"). Both parts require the same holder configuration.

Q: What is the difference between the 3AG 2 and 3AG 2-R?

A: The primary differences are product status and compliance. The 3AG 2 is obsolete and RoHS non-compliant, while the 3AG 2-R is active and ROHS3 compliant. Electrical and mechanical specifications are identical.

Q: Can the FSA-2A be used as a substitute for the 3AG 2?

A: Yes, the FSA-2A meets all critical electrical and mechanical parameters: 2 A current rating, 250 V voltage rating, fast-blow response, and 3AG package dimensions. However, the FSA-2A has a lower breaking capacity (100 A vs. 200 A). Verify that the lower breaking capacity is acceptable for your circuit protection requirements.

Q: Are there any compatibility issues with holder types?

A: No. All substitute parts are designed for use with 3AB and 3AG holders. Physical dimensions are identical across all substitutes (0.250" Dia x 1.252" L / 6.35mm x 31.80mm).

Q: What certifications do the substitute parts carry?

A: The 3AG 2-R carries CE, CSA, cULus, and PSE certifications. The FSA-2A carries cULus and UL 248 certifications. The 0034.5131 carries CSA and UL certifications. All meet international safety standards for glass cartridge fuses.

Q: Is RoHS compliance a requirement for my application?

A: If RoHS compliance is mandated by your design or procurement standards, select either the 3AG 2-R or FSA-2A, both of which are ROHS3 compliant. The original 3AG 2 and 0034.5131 are not RoHS compliant.