3AG 6 Glass Cartridge Fuse - Equivalent & Substitute Parts

Part Overview

The 3AG 6 is a 6 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, requiring identification of active equivalent alternatives for new designs and ongoing maintenance applications. The 3AG form factor (1/4" x 1-1/4") with 3AB/3AG holder mounting remains a standard industrial fuse package, making direct substitutes readily available from multiple manufacturers.

Substiute Parts

3AG 6

Bel Fuse Inc.In Stock: 9443AG 6 Datasheet

Current PartRFQ

3AG 6-R

Bel Fuse Inc.In Stock: 78533AG 6-R Datasheet

DirectRFQ

0312006.HXP

Littelfuse Inc.In Stock: 31200312006.HXP Datasheet

SimilarRFQ

0034.5140

SCHURTER Inc.In Stock: 8190034.5140 Datasheet

Parametric EquivalentRFQ

FSA-6A

OptiFuseIn Stock: 2284FSA-6A Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3AG 6 fuse is determined by strict equivalence across the following parameters:

• Current Rating: 6 A (exact match required)
• Voltage Rating: 250 V AC (exact match required)
• Response Time: Fast Blow (exact match required)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
• Breaking Capacity: 200 A (exact match required)
• Operating Temperature: -55°C ~ 125°C (exact match required)

All substitute parts listed maintain these core electrical and mechanical parameters, ensuring direct compatibility with existing 3AB/3AG holder installations. Variations in secondary parameters such as melting I²t, DC cold resistance, and RoHS compliance do not affect functional substitution but may influence selection based on application requirements and regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

For applications requiring replacement of the obsolete 3AG 6 fuse, the following selection criteria apply:

Active Product Status Priority: 3AG 6-R (Bel Fuse Inc.), 0312006.HXP (Littelfuse Inc.), and FSA-6A (OptiFuse) are all active products with current manufacturing support and availability.

RoHS3 Compliance: All active substitutes are ROHS3 compliant, meeting modern regulatory requirements. The original 3AG 6 is RoHS non-compliant and should be replaced in new designs.

Certification Coverage: 3AG 6-R provides CE, CSA, cURus, and PSE certifications. 0312006.HXP offers the broadest certification scope including CE, CSA, KC, PSE, and UL. FSA-6A carries cULus and UL 248 certifications. Selection should align with target market regulatory requirements.

Electrical Characteristics: All substitutes maintain identical current, voltage, and breaking capacity ratings. Melting I²t values range from 107 to 120.2, and DC cold resistance from 0.014 to 0.0178 Ohms. These variations are within acceptable tolerance for fast-blow cartridge fuse applications and do not affect functional compatibility.

Frequently Asked Questions (FAQ)

Q: Can 3AG 6-R directly replace the obsolete 3AG 6?

A: Yes. Both parts share identical electrical ratings (6 A, 250 V AC, fast-blow response), mechanical dimensions (1/4" x 1-1/4"), and holder compatibility (3AB/3AG). The primary difference is product status: 3AG 6-R is active with ROHS3 compliance, while 3AG 6 is obsolete and RoHS non-compliant.

Q: Are Littelfuse 0312006.HXP and OptiFuse FSA-6A compatible with existing 3AG holders?

A: Yes. Both parts conform to the 3AB/3AG package standard with identical 1/4" x 1-1/4" dimensions. They mount directly into existing 3AG holder installations without modification.

Q: What is the significance of melting I²t differences between substitutes?

A: Melting I²t (107 to 120.2 across the substitute range) indicates the thermal energy required to melt the fuse element. These variations are characteristic of different manufacturer designs but do not affect the 6 A current rating or fast-blow response time. All values are within acceptable tolerance for this fuse class.

Q: Which substitute offers the broadest international certification?

A: The Littelfuse 0312006.HXP carries CE, CSA, KC, PSE, and UL certifications, providing coverage across North American, European, Korean, and Japanese markets. Selection should match your target regulatory jurisdictions.

Q: Is RoHS3 compliance mandatory for substitution?

A: RoHS3 compliance is required for new product designs and applications subject to EU Directive 2011/65/EU. All active substitutes (3AG 6-R, 0312006.HXP, FSA-6A) are ROHS3 compliant. The original 3AG 6 is non-compliant and unsuitable for new designs in regulated markets.