GSA 750 Equivalent & Substitute Parts

Part Overview

The GSA 750 is a 750 mA ceramic cartridge fuse rated for 250 V AC with slow-blow response characteristics. Manufactured by Bel Fuse Inc., this component is classified as obsolete product status. Due to its obsolete designation, identifying equivalent and substitute parts with active product status is necessary for ongoing system maintenance and new design implementations. The GSA 750 requires a 3AB or 3AG fuse holder and is housed in a 1/4" x 1-1/4" form factor.

Key Parameters

Parameter	Value
Current Rating	750 mA
Voltage Rating - AC	250 V
Fuse Type	Cartridge, Ceramic
Response Time	Slow Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4"
Mounting Type	Requires Holder
Operating Temperature Range	-55°C ~ 125°C
Approval Agencies	CE, CSA, UL

Substitute Part Grouping Explanation

Substitution eligibility for the GSA 750 is determined by the following critical parameters:

Current Rating: 750 mA (exact match required)
Voltage Rating - AC: 250 V (exact match required)
Fuse Type: Cartridge, Ceramic (exact match required)
Response Time: Slow Blow (exact match required)
Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
Operating Temperature Range: -55°C ~ 125°C (minimum requirement)

Substitute parts must satisfy all critical parameters to ensure mechanical and electrical compatibility within existing fuse holder assemblies. Secondary parameters such as breaking capacity, melting I²t, and DC cold resistance may vary within acceptable engineering tolerances for the application.

Parameter Comparison

Parameter	GSA 750	GSA 750-R	0326.750HXP
Manufacturer	Bel Fuse Inc.	Bel Fuse Inc.	Littelfuse Inc.
Current Rating (Amps)	750 mA	750 mA	750 mA
Voltage Rating - AC	250 V	250 V	250 V
Voltage Rating - DC	Not specified	Not specified	125 V
Fuse Type	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic
Response Time	Slow Blow	Slow Blow	Slow Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"
Size / Dimension	0.250" Dia x 1.252" L (6.35mm x 31.80mm)	0.250" Dia x 1.252" L (6.35mm x 31.80mm)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)
Breaking Capacity @ Rated Voltage	35A	35A	100A AC, 10kA DC
Melting I²t	9.7	10	7
DC Cold Resistance	0.7 Ohms	0.642 Ohms	0.641 Ohms
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	CE, CSA, UL	CE, CSA, cULus	CE, CSA, UL

Engineering Selection Recommendations

GSA 750-R is the primary direct substitute for the obsolete GSA 750. Both components are manufactured by Bel Fuse Inc. and share identical electrical and mechanical specifications. The GSA 750-R carries active product status and holds ROHS3 compliance, addressing regulatory requirements that the original GSA 750 does not meet. Approval certifications include CE, CSA, and cULus.

0326.750HXP manufactured by Littelfuse Inc. is a compatible alternative that meets all critical substitution parameters. This part adds DC voltage rating capability (125 V DC) and provides higher breaking capacity (100A AC, 10kA DC) compared to the GSA 750. The 0326.750HXP is ROHS3 compliant and holds CE, CSA, and UL certifications. Dimensional tolerance of 0.002" in length (31.75mm vs 31.80mm) remains within acceptable mechanical fit for standard 3AB and 3AG fuse holders.

Frequently Asked Questions (FAQ)

Q: Can GSA 750-R be used as a direct replacement for GSA 750?

A: Yes. GSA 750-R is electrically and mechanically identical to GSA 750. Both components share the same current rating (750 mA), voltage rating (250 V AC), fuse type (ceramic cartridge), response time (slow blow), and package dimensions (3AB, 3AG, 1/4" x 1-1/4"). GSA 750-R is the recommended substitute due to active product status and improved regulatory compliance.

Q: What are the differences between GSA 750-R and 0326.750HXP?

A: Both parts meet the critical substitution parameters for the GSA 750. Key differences include manufacturer (Bel Fuse Inc. vs Littelfuse Inc.), DC voltage rating (0326.750HXP adds 125 V DC capability), breaking capacity (0326.750HXP provides 100A AC and 10kA DC vs 35A for GSA 750-R), and melting I²t values (7 vs 10). Physical dimensions vary by 0.002" in length.

Q: Are there compatibility concerns with existing fuse holders?

A: No. All three parts conform to 3AB and 3AG fuse holder standards with 1/4" x 1-1/4" form factor. Dimensional variations are within mechanical tolerance for standard holder assemblies.

Q: Which substitute part should be selected for new designs?

A: Selection depends on application requirements. For direct replacement of existing GSA 750 installations, GSA 750-R is the primary choice. For applications requiring DC voltage protection or higher breaking capacity, 0326.750HXP is appropriate. Both parts are ROHS3 compliant and hold current regulatory certifications.

Q: Does the DC voltage rating of 0326.750HXP affect AC-only applications?

A: No. The presence of DC voltage rating does not impact AC circuit performance. 0326.750HXP is fully compatible with AC-only applications and provides equivalent protection characteristics to GSA 750 in such circuits.

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