GSA 2.5 Ceramic Fuse Equivalent & Substitute Parts

Part Overview

The GSA 2.5 is a 2.5 A ceramic cartridge fuse rated for 250 V AC operation, designed for applications requiring slow-blow response characteristics. The main part (GSA 2.5) carries an obsolete product status, making identification of active equivalent parts essential for procurement and design continuity. Substitute parts must maintain identical electrical ratings and mechanical compatibility with standard 3AB/3AG holder requirements.

Substiute Parts

GSA 2.5

Bel Fuse Inc.In Stock: 970GSA 2.5 Datasheet

Current PartRFQ

GSA 2.5-R

Bel Fuse Inc.In Stock: 1503GSA 2.5-R Datasheet

DirectRFQ

0001.2508

SCHURTER Inc.In Stock: 11040001.2508 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the GSA 2.5 is determined by strict equivalence across the following critical parameters:

Current Rating: 2.5 A (exact match required) Voltage Rating: 250 V AC minimum (exact match required) Fuse Type: Cartridge, Ceramic (exact match required) Response Time: Slow Blow (exact match required) Mechanical Compatibility: Package case and physical dimensions must accommodate existing holder requirements

The GSA 2.5-R qualifies as a direct manufacturer substitute, maintaining identical electrical and mechanical specifications while offering active product status and improved RoHS3 compliance. The SCHURTER 0001.2508 is classified as a similar substitute due to different mechanical packaging (5mm x 20mm versus 3AB/3AG) and higher DC voltage rating (300 V DC), which introduces holder incompatibility despite matching AC voltage and current ratings.

Parameter Comparison

Engineering Selection Recommendations

For direct replacement of the obsolete GSA 2.5, the GSA 2.5-R is the primary selection. Both parts are manufactured by Bel Fuse Inc., maintain identical electrical specifications (2.5 A, 250 V AC, slow-blow ceramic cartridge), and share mechanical compatibility with 3AB/3AG holders. The GSA 2.5-R offers the advantage of active product status and ROHS3 compliance, addressing regulatory requirements for new designs and procurement continuity.

The SCHURTER 0001.2508 is not recommended as a direct replacement due to mechanical incompatibility. Although it matches the current rating (2.5 A) and AC voltage rating (250 V), its 5mm x 20mm package case differs from the 3AB/3AG standard, requiring a different holder assembly. Additionally, the significantly lower melting I²t value (11.7 versus 94) indicates different thermal response characteristics that may not align with the original circuit protection design intent.

Frequently Asked Questions (FAQ)

Q: Can the GSA 2.5-R be used as a direct replacement for the GSA 2.5?

A: Yes. The GSA 2.5-R maintains identical current rating (2.5 A), voltage rating (250 V AC), fuse type (ceramic cartridge), response time (slow blow), and mechanical package (3AB/3AG, 1/4" x 1-1/4"). No holder modification is required.

Q: Why is the SCHURTER 0001.2508 not suitable as a replacement?

A: The 0001.2508 uses a 5mm x 20mm package case, which is mechanically incompatible with 3AB/3AG holders designed for the GSA 2.5. Additionally, its melting I²t of 11.7 differs significantly from the GSA 2.5 specification of 94, indicating different thermal response behavior.

Q: What is the significance of the melting I²t parameter?

A: Melting I²t defines the thermal energy required to melt the fuse element and is critical for circuit protection coordination. The GSA 2.5 and GSA 2.5-R both specify 94, ensuring identical protection characteristics. The 0001.2508 value of 11.7 represents a fundamentally different fuse design unsuitable for direct substitution.

Q: Does the GSA 2.5-R offer improved compliance compared to the original GSA 2.5?

A: Yes. The GSA 2.5-R is ROHS3 compliant, whereas the GSA 2.5 is RoHS non-compliant. Both maintain equivalent regulatory approvals (CE, CSA, PSE) with the GSA 2.5-R adding cULus certification.

Q: Are there DC voltage considerations for these fuses?

A: The GSA 2.5 and GSA 2.5-R do not specify DC voltage ratings in their technical data. The SCHURTER 0001.2508 specifies 300 V DC capability. If DC operation is required, consult manufacturer datasheets or contact technical support for clarification on AC-only versus AC/DC rated variants.