GSA 300-R Equivalent & Substitute Parts

Part Overview

The GSA 300-R is a 300 mA ceramic cartridge fuse rated for 250 V AC operation, manufactured by Bel Fuse Inc. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new designs. The GSA 300-R requires a 3AB or 3AG fuse holder and is designed for slow-blow response applications requiring ceramic construction and holder-based mounting.

Substiute Parts

GSA 300-R

Bel Fuse Inc.In Stock: 988GSA 300-R Datasheet

Current PartRFQ

0326.300MXP

Littelfuse Inc.In Stock: 10230326.300MXP Datasheet

DirectRFQ

0326.300HXP

Littelfuse Inc.In Stock: 10150326.300HXP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the GSA 300-R is based on matching the following critical parameters:

• Current Rating: 300 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)
• Mounting Type: Requires Holder (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

The substitute parts listed below meet all these criteria and are manufactured by Littelfuse Inc., an active product line alternative to the obsolete GSA 300-R.

Parameter Comparison

Engineering Selection Recommendations

Both 0326.300MXP and 0326.300HXP from Littelfuse Inc. are direct substitutes for the obsolete GSA 300-R. These parts are active products with current manufacturing support and meet all critical electrical and mechanical parameters.

The Littelfuse substitutes provide additional DC voltage rating capability (125 V DC) not specified in the original GSA 300-R, offering enhanced flexibility for applications requiring DC protection. Both substitute parts maintain ROHS3 compliance and carry CE, CSA, and UL certifications, ensuring regulatory alignment for most industrial and commercial applications.

Selection between 0326.300MXP and 0326.300HXP should be based on application-specific requirements and packaging preferences, as both parts are electrically and mechanically equivalent.

Frequently Asked Questions (FAQ)

Q: Can 0326.300MXP or 0326.300HXP be used as direct replacements for GSA 300-R?

A: Yes. Both Littelfuse parts match the GSA 300-R in current rating (300 mA), AC voltage rating (250 V), fuse type (ceramic cartridge), response time (slow blow), package dimensions (3AB, 3AG, 1/4" x 1-1/4"), and operating temperature range (-55°C ~ 125°C).

Q: What is the difference between 0326.300MXP and 0326.300HXP?

A: Both parts are electrically and mechanically identical. They share the same current rating, voltage ratings, fuse type, response time, package, and operating temperature range. Selection between them should be based on availability and packaging format.

Q: Are the substitute parts compatible with existing 3AB and 3AG fuse holders?

A: Yes. Both 0326.300MXP and 0326.300HXP are designed for 3AB and 3AG fuse holders and maintain the required 1/4" x 1-1/4" form factor.

Q: Do the substitute parts have DC voltage ratings?

A: Yes. Both Littelfuse substitutes are rated for 125 V DC, providing additional capability beyond the AC-only specification of the original GSA 300-R.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both 0326.300MXP and 0326.300HXP are ROHS3 compliant and carry CE, CSA, and UL certifications.