GSA 1 Ceramic Fuse 1A 250VAC Equivalent & Substitute Parts

Part Overview

The GSA 1 is a 1 A, 250 V AC ceramic cartridge fuse manufactured by Bel Fuse Inc. in the 3AB/3AG form factor (1/4" x 1-1/4"). This fuse is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new designs. The GSA 1 requires a compatible fuse holder for installation and operates across a temperature range of -55°C to 125°C with slow-blow response characteristics.

Substiute Parts

GSA 1

Bel Fuse Inc.In Stock: 984GSA 1 Datasheet

Current PartRFQ

GSA 1-R

Bel Fuse Inc.In Stock: 1855GSA 1-R Datasheet

DirectRFQ

0001.2504

SCHURTER Inc.In Stock: 31810001.2504 Datasheet

SimilarRFQ

TCA-1A

OptiFuseIn Stock: 5734TCA-1A Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the GSA 1 are classified based on electrical and mechanical compatibility:

Direct Manufacturer Equivalent (GSA 1-R): Identical electrical specifications (1 A, 250 V AC, slow-blow ceramic cartridge) and mechanical form factor (3AB/3AG, 1/4" x 1-1/4"). This part is manufactured by the same supplier (Bel Fuse Inc.) and maintains active product status with improved RoHS3 compliance.

Similar Manufacturer Equivalent (0001.2504): Matches core electrical parameters (1 A, 250 V AC, slow-blow ceramic cartridge) but differs in mechanical form factor (5mm x 20mm instead of 3AB/3AG) and voltage rating (adds 300 V DC capability). Manufactured by SCHURTER Inc. with active status and higher breaking capacity (1.5 kA).

Parametric Equivalent (TCA-1A): Matches electrical specifications (1 A, 250 V AC, slow-blow ceramic cartridge) and mechanical form factor (3AB/3AG, 1/4" x 1-1/4"). Manufactured by OptiFuse with active status and higher breaking capacity (100 A). RoHS3 compliant.

Substitution is determined by: current rating, AC voltage rating, fuse type (ceramic cartridge), response time (slow-blow), and mechanical package compatibility with existing holders.

Parameter Comparison

Engineering Selection Recommendations

GSA 1-R (Direct Equivalent): Select this part for direct replacement in existing 3AB/3AG holder installations. It maintains identical electrical and mechanical specifications while offering active product status and RoHS3 compliance. Approval agencies include CE, CSA, cULus, and PSE.

TCA-1A (Parametric Equivalent): Select this part for new designs or replacements requiring 3AB/3AG form factor compatibility. It provides higher breaking capacity (100 A) and RoHS3 compliance with cULus and UL 248 certifications. Suitable for applications where the GSA 1-R is unavailable.

0001.2504 (Similar Equivalent): This part is suitable only when mechanical form factor can be changed to 5mm x 20mm. It offers the highest breaking capacity (1.5 kA) and extended DC voltage rating (300 V). Requires different holder hardware and is not a direct mechanical substitute for existing GSA 1 installations.

Selection priority is determined by holder compatibility, product availability, and regulatory compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can GSA 1-R be used as a direct replacement for GSA 1? A: Yes. GSA 1-R is electrically and mechanically identical to GSA 1, with the same 1 A current rating, 250 V AC voltage rating, 3AB/3AG form factor, and slow-blow response. It fits existing GSA 1 holders without modification.

Q: What is the difference between GSA 1-R and TCA-1A? A: Both parts share identical electrical specifications (1 A, 250 V AC, slow-blow ceramic cartridge) and mechanical form factor (3AB/3AG, 1/4" x 1-1/4"). The primary differences are manufacturer (Bel Fuse Inc. vs. OptiFuse) and breaking capacity (35 A vs. 100 A). Both are RoHS3 compliant and active products.

Q: Why is 0001.2504 listed as a similar equivalent rather than a direct substitute? A: The 0001.2504 uses a different mechanical form factor (5mm x 20mm instead of 3AB/3AG, 1/4" x 1-1/4"). It cannot be installed in existing GSA 1 holders without changing the holder hardware. It is suitable only for new designs or applications where holder replacement is feasible.

Q: Are all substitute parts RoHS3 compliant? A: GSA 1-R, TCA-1A, and 0001.2504 are all RoHS3 compliant. The original GSA 1 is RoHS non-compliant. For applications requiring RoHS compliance, use one of the active substitute parts.

Q: What approval agencies certify these fuses? A: GSA 1-R carries CE, CSA, cULus, and PSE approvals. TCA-1A carries cULus and UL 248 approvals. 0001.2504 carries CCC, cURus, KC, PSE/JET, and VDE approvals. Verify that the selected part meets your application's regulatory requirements.

Q: Can I use 0001.2504 in a 3AB/3AG holder? A: No. The 0001.2504 has a 5mm x 20mm form factor and is physically incompatible with 3AB/3AG holders. A different holder designed for 5mm x 20mm fuses is required.