Equivalent & Substitute Parts for 3AG 10 Glass Fuse

Part Overview

The 3AG 10 is a 10 A, 250 V AC/DC fast-blow glass cartridge fuse manufactured by Bel Fuse Inc. This component is classified as obsolete, making equivalent substitutes necessary for ongoing system maintenance and new designs. The fuse requires a 3AB or 3AG holder and is designed for applications requiring fast response protection in industrial and commercial equipment. Substitute parts must maintain identical electrical ratings, mechanical dimensions, and holder compatibility to ensure proper circuit protection without modification to existing installations.

Substiute Parts

3AG 10

Bel Fuse Inc.In Stock: 11273AG 10 Datasheet

Current PartRFQ

3AG 10-R

Bel Fuse Inc.In Stock: 48783AG 10-R Datasheet

DirectRFQ

BK/AGC-B-10

Eaton - Electronics DivisionIn Stock: 1109BK/AGC-B-10 Datasheet

SimilarRFQ

FSA-10A

OptiFuseIn Stock: 803FSA-10A Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 3AG 10 is determined by strict equivalence across the following parameters: current rating (10 A), voltage rating (250 V AC), fuse type (cartridge glass), response time (fast blow), physical dimensions (1/4" x 1-1/4"), and holder compatibility (3AB/3AG). All substitute parts listed maintain these core electrical and mechanical specifications, ensuring direct interchangeability without circuit modification or holder replacement.

The substitute parts are grouped as follows:

Direct Manufacturer Equivalent (3AG 10-R): Same manufacturer (Bel Fuse Inc.), identical series designation, and matching electrical characteristics. This part differs only in packaging format (bulk vs. standard) and product status (active vs. obsolete).

Similar Manufacturer Equivalent (BK/AGC-B-10): Manufactured by Eaton - Electronics Division under the AGC series designation. Maintains all critical electrical parameters and physical dimensions. Differs in melting I²t value (486 vs. 316) and approval agency certifications.

Parametric Equivalent (FSA-10A): Manufactured by OptiFuse under the FSA series. Meets all electrical and mechanical requirements with matching current, voltage, and dimensional specifications. Differs in melting I²t value (370.2 vs. 316) and approval certifications.

Parameter Comparison

Engineering Selection Recommendations

3AG 10-R (Bel Fuse Inc.): This is the primary substitute for the obsolete 3AG 10. It is manufactured by the same supplier, maintains identical electrical and mechanical specifications, and carries active product status. The 3AG 10-R is ROHS3 compliant and includes cURus certification, making it suitable for applications requiring updated regulatory compliance. DC cold resistance is marginally lower (0.008 Ohms vs. 0.009 Ohms), which is within acceptable tolerance for this component class.

BK/AGC-B-10 (Eaton - Electronics Division): This substitute is suitable for applications where Eaton components are preferred or standardized. It maintains all critical electrical parameters and physical dimensions. The melting I²t value (486) is higher than the original part (316), indicating a slightly slower thermal response. This part is not ROHS3 compliant and carries CSA and UL certifications only. Selection should be based on existing supplier relationships and certification requirements.

FSA-10A (OptiFuse): This substitute provides an alternative from a third-party manufacturer with active product status and ROHS3 compliance. The melting I²t value (370.2) falls between the original and Eaton equivalent, providing intermediate thermal characteristics. This part carries cULus and UL 248 certifications. Selection is appropriate for applications requiring ROHS3 compliance and where OptiFuse components are acceptable.

Frequently Asked Questions (FAQ)

Q: Can the 3AG 10-R be used as a direct replacement for the obsolete 3AG 10?

A: Yes. The 3AG 10-R is manufactured by Bel Fuse Inc. and maintains identical current rating (10 A), voltage rating (250 V AC), fuse type (cartridge glass), response time (fast blow), and physical dimensions (1/4" x 1-1/4"). It is compatible with existing 3AB and 3AG holders without modification.

Q: What is the difference between the 3AG 10 and 3AG 10-R?

A: The primary differences are product status (obsolete vs. active), RoHS compliance (non-compliant vs. ROHS3 compliant), and packaging format (standard vs. bulk). Electrical and mechanical specifications are identical.

Q: Are BK/AGC-B-10 and FSA-10A fully interchangeable with the 3AG 10?

A: Both parts are mechanically and electrically compatible for direct installation in 3AB/3AG holders. However, they differ in melting I²t values and approval certifications. BK/AGC-B-10 has a melting I²t of 486, while FSA-10A has 370.2, compared to the original 316. These differences may affect thermal response characteristics in specific circuit applications.

Q: Which substitute should I select for new designs?

A: For new designs, 3AG 10-R or FSA-10A are recommended due to ROHS3 compliance and active product status. Selection between these two depends on supplier availability, certification requirements, and existing component standardization.

Q: Do all substitute parts fit in the same holder?

A: Yes. All substitute parts maintain the 3AB/3AG package designation and physical dimensions (0.250" diameter x 1.25" length nominal), ensuring compatibility with existing holders. Minor dimensional variations (1.250" vs. 1.252" length) are within mechanical tolerance for holder fitment.

Q: What certifications should I consider when selecting a substitute?

A: The original 3AG 10 carries CE, CSA, PSE, and UL certifications. 3AG 10-R adds cURus certification. BK/AGC-B-10 carries CSA and UL only. FSA-10A carries cULus and UL 248. Selection should align with the regulatory requirements of your target market and application.