GSA 15 Ceramic Fuse Equivalent & Substitute Parts

Part Overview

The GSA 15 is a 15A ceramic cartridge fuse rated for 125V AC/DC operation, manufactured by Bel Fuse Inc. This component is classified as obsolete, requiring identification of suitable alternatives for new designs and ongoing maintenance applications. The GSA 15 utilizes a 3AB/3AG holder format with 1/4" x 1-1/4" dimensions and provides slow-blow response characteristics suitable for circuit protection in low-voltage AC/DC systems.

Substiute Parts

GSA 15

Bel Fuse Inc.In Stock: 1149GSA 15 Datasheet

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GSA 15-R

Bel Fuse Inc.In Stock: 8109GSA 15-R Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the GSA 15 is determined by the following critical parameters:

Current Rating: The substitute must maintain 15A current rating to ensure equivalent circuit protection.

Fuse Type and Package: The substitute must be a ceramic cartridge fuse compatible with 3AB/3AG holders and maintain the 1/4" x 1-1/4" form factor for mechanical interchangeability.

Response Time: The substitute must provide slow-blow characteristics to match the original thermal response profile.

Voltage Rating: The substitute voltage rating must equal or exceed the system voltage requirement. A higher voltage rating (250V) is acceptable for 125V systems and provides enhanced safety margin.

Melting I²t: The substitute must maintain identical melting I²t value (2123) to preserve thermal-magnetic coordination with upstream protection devices.

Operating Temperature Range: The substitute must support the full -55°C ~ 125°C operating envelope.

DC Cold Resistance: The substitute must maintain 0.006 Ohms DC cold resistance for consistent electrical performance.

Parameter Comparison

Engineering Selection Recommendations

The GSA 15-R is the direct substitute for the obsolete GSA 15. Both components share identical current rating (15A), fuse type (ceramic cartridge), response time (slow blow), package format (3AB/3AG), melting I²t (2123), operating temperature range (-55°C ~ 125°C), and DC cold resistance (0.006 Ohms).

The GSA 15-R provides enhanced voltage rating (250V versus 125V), which is acceptable for applications originally specified for 125V operation and provides additional safety margin. The GSA 15-R maintains active product status with current manufacturing availability and ROHS3 compliance, addressing obsolescence and regulatory requirements of the original GSA 15.

Both components hold equivalent international certifications (CE, CSA, PSE) with GSA 15-R additionally certified as cURus. Mechanical interchangeability is confirmed through identical package dimensions and holder compatibility.

Frequently Asked Questions (FAQ)

Q: Can GSA 15-R be used as a direct replacement for GSA 15 in existing circuits?

A: Yes. GSA 15-R is mechanically and electrically compatible with GSA 15. Both components share identical current rating, fuse type, response time, package format, and thermal characteristics. The higher voltage rating of GSA 15-R (250V) is acceptable for 125V systems.

Q: What is the significance of the different breaking capacity values?

A: Breaking capacity is specified at the component's rated voltage. GSA 15 specifies 10 kA at 125V; GSA 15-R specifies 750A at 250V. Both values are within acceptable ranges for their respective voltage ratings and do not affect substitution compatibility for standard circuit protection applications.

Q: Why is RoHS compliance important for this substitution?

A: The GSA 15 is RoHS non-compliant, while GSA 15-R is ROHS3 compliant. For new designs and applications subject to RoHS regulations, GSA 15-R is the required choice. For legacy system maintenance, either component may be acceptable depending on regulatory jurisdiction and application requirements.

Q: Are the holder requirements identical between GSA 15 and GSA 15-R?

A: Yes. Both components require 3AB/3AG holders and maintain identical 1/4" x 1-1/4" form factor. No holder modifications or upgrades are necessary for substitution.

Q: What certifications apply to both components?

A: Both GSA 15 and GSA 15-R hold CE, CSA, and PSE certifications. GSA 15 additionally holds UL certification; GSA 15-R holds cURus certification. These certifications are equivalent for circuit protection applications.