GSA 1.25 Equivalent & Substitute Parts

Part Overview

The GSA 1.25 is a 1.25 A ceramic cartridge fuse rated for 250 V AC/DC operation, manufactured by Bel Fuse Inc. This component is classified as obsolete, necessitating identification of active equivalent alternatives for ongoing system support and procurement. The fuse requires a 3AB or 3AG holder and operates across a temperature range of -55°C to 125°C with slow-blow response characteristics.

Substiute Parts

GSA 1.25

Bel Fuse Inc.In Stock: 1004GSA 1.25 Datasheet

Current PartRFQ

GSA 1.25-R

Bel Fuse Inc.In Stock: 1014GSA 1.25-R Datasheet

DirectRFQ

0001.2505

SCHURTER Inc.In Stock: 122240001.2505 Datasheet

SimilarRFQ

TCA-1.25A

OptiFuseIn Stock: 2297TCA-1.25A Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the GSA 1.25 are categorized based on electrical and mechanical compatibility:

Direct Manufacturer Substitute (GSA 1.25-R): Identical electrical specifications and package dimensions. Same manufacturer with active product status and improved RoHS3 compliance.

Similar Manufacturer Substitute (0001.2505 by SCHURTER Inc.): Matches current rating, AC voltage rating, and ceramic cartridge type. Differs in package format (5mm x 20mm versus 3AB/3AG), DC voltage rating (300 V), and breaking capacity (1.5 kA). Requires mechanical compatibility verification with holder.

Parametric Equivalent (TCA-1.25A by OptiFuse): Matches current rating, AC voltage rating, package dimensions, and response time. Identical mechanical form factor and electrical performance envelope.

Substitution eligibility is determined by: current rating (1.25 A), AC voltage rating (250 V), fuse type (ceramic cartridge), response time (slow blow), and package/holder compatibility.

Parameter Comparison

Engineering Selection Recommendations

GSA 1.25-R (Bel Fuse Inc.): Primary substitute for direct replacement. Maintains identical electrical and mechanical specifications with active product status and RoHS3 compliance. Recommended for applications requiring no design modification.

TCA-1.25A (OptiFuse): Suitable alternative with matching package dimensions and electrical performance. Active product status with RoHS3 compliance and UL 248 certification. Appropriate for applications where manufacturer flexibility is acceptable.

0001.2505 (SCHURTER Inc.): Electrical equivalent with different package format (5mm x 20mm). Substitution requires mechanical compatibility verification with existing holder infrastructure. Higher breaking capacity (1.5 kA) and extended DC voltage rating (300 V) provide additional performance margin. Suitable only where holder accommodation is confirmed.

Frequently Asked Questions (FAQ)

Q: Can GSA 1.25-R directly replace GSA 1.25 without design changes? A: Yes. GSA 1.25-R maintains identical current rating (1.25 A), voltage rating (250 V AC), package dimensions (3AB/3AG, 1/4" x 1-1/4"), and response time (slow blow). No holder or circuit modification is required.

Q: What is the primary difference between GSA 1.25 and TCA-1.25A? A: Both components share identical electrical specifications and package form factor. The primary difference is manufacturer (Bel Fuse Inc. versus OptiFuse) and product status (obsolete versus active). TCA-1.25A is an active equivalent suitable for new designs or replacement procurement.

Q: Can 0001.2505 be used as a direct substitute? A: 0001.2505 matches the current rating (1.25 A) and AC voltage rating (250 V) but uses a different package format (5mm x 20mm versus 3AB/3AG). Substitution requires verification that the existing fuse holder accommodates the 5mm x 20mm cartridge. Mechanical compatibility must be confirmed before implementation.

Q: What compliance certifications are relevant for substitute selection? A: GSA 1.25-R and TCA-1.25A both carry RoHS3 compliance, addressing environmental regulatory requirements. GSA 1.25 is RoHS non-compliant. All three components hold relevant safety certifications (CE, CSA, UL, PSE). Compliance requirements should be verified against system-level regulatory obligations.

Q: Are there differences in DC voltage rating among these substitutes? A: GSA 1.25, GSA 1.25-R, and TCA-1.25A are rated for 250 V AC/DC operation. 0001.2505 extends DC rating to 300 V. For applications requiring DC operation, all four components are suitable at 250 V DC maximum. The 0001.2505 provides additional DC margin if system requirements exceed 250 V DC.