GSA 12 Equivalent & Substitute Parts

Part Overview

The GSA 12 is a 12 A, 125 V AC ceramic cartridge fuse manufactured by Bel Fuse Inc. with slow-blow response characteristics. This component is classified as obsolete, necessitating identification of active equivalent alternatives for continued system support and procurement. The GSA 12 requires a 3AB or 3AG holder and is rated for breaking capacity of 10 kA at rated voltage with operating temperature range of -55°C to 125°C.

Substiute Parts

GSA 12

Bel Fuse Inc.In Stock: 1232GSA 12 Datasheet

Current PartRFQ

GSA 12-R

Bel Fuse Inc.In Stock: 2278GSA 12-R Datasheet

DirectRFQ

0326012.MXDP

Littelfuse Inc.In Stock: 23350326012.MXDP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the GSA 12 is determined by the following critical parameters:

• Current Rating: 12 A (must match exactly)
• Fuse Type: Cartridge, Ceramic (must match exactly)
• Response Time: Slow Blow (must match exactly)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (must match exactly)
• Operating Temperature Range: -55°C ~ 125°C (must match or exceed)
• Voltage Rating - AC: Must be equal to or greater than 125 V

Two substitute parts meet these criteria: GSA 12-R (Bel Fuse Inc.) and 0326012.MXDP (Littelfuse Inc.). Both are active products with identical current ratings, fuse type, response characteristics, and physical dimensions. Both support the required 3AB and 3AG holder compatibility and maintain the specified operating temperature range.

Parameter Comparison

Engineering Selection Recommendations

GSA 12-R is the direct manufacturer equivalent from Bel Fuse Inc. It maintains identical electrical characteristics (12 A current rating, slow-blow response, 1277 melting I²t) and physical dimensions. The GSA 12-R operates at 250 V AC, which exceeds the original 125 V AC specification and is backward compatible. GSA 12-R holds active product status and is ROHS3 compliant, addressing regulatory obsolescence of the original part.

0326012.MXDP from Littelfuse Inc. is a cross-manufacturer alternative meeting all substitution criteria. It provides 250 V AC and 60 V DC ratings with identical 12 A current and slow-blow characteristics. Physical dimensions are equivalent within tolerance (0.250" Dia x 1.250" L versus 1.252" L). The 0326012.MXDP is ROHS3 compliant and holds active product status. Differences include lower melting I²t (445 versus 1277) and lower DC cold resistance (0.0011 Ohms versus 0.008 Ohms).

Both substitutes are suitable for applications requiring 125 V AC operation. Selection between GSA 12-R and 0326012.MXDP depends on manufacturer preference, supply chain considerations, and specific application requirements regarding melting I²t and DC resistance characteristics.

Frequently Asked Questions (FAQ)

Q: Can GSA 12-R directly replace GSA 12 in a 125 V AC circuit?

A: Yes. GSA 12-R is rated for 250 V AC, which exceeds the 125 V AC requirement of the original GSA 12. Both parts share identical current rating (12 A), fuse type (ceramic cartridge), response time (slow blow), and physical dimensions (0.250" Dia x 1.252" L). Both require 3AB or 3AG holders.

Q: What is the difference between GSA 12-R and 0326012.MXDP?

A: Both parts meet core substitution criteria: 12 A current rating, ceramic cartridge type, slow-blow response, and 3AB/3AG compatibility. GSA 12-R is manufactured by Bel Fuse Inc. with melting I²t of 1277 and DC cold resistance of 0.008 Ohms. 0326012.MXDP is manufactured by Littelfuse Inc. with melting I²t of 445 and DC cold resistance of 0.0011 Ohms. Physical dimensions are equivalent within tolerance.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both GSA 12-R and 0326012.MXDP are ROHS3 compliant, whereas the original GSA 12 is RoHS non-compliant. This addresses regulatory requirements for new procurements.

Q: Do the substitute parts fit the same holder as GSA 12?

A: Yes. Both GSA 12-R and 0326012.MXDP are compatible with 3AB and 3AG holders, identical to the original GSA 12 requirement.

Q: Why does 0326012.MXDP have lower melting I²t than GSA 12?

A: Melting I²t is a thermal characteristic determined by fuse element design. The 0326012.MXDP has a melting I²t of 445 compared to 1277 for GSA 12 and GSA 12-R. This reflects different thermal mass and element composition. Both values are within acceptable ranges for 12 A slow-blow ceramic cartridge fuses and do not affect basic substitution eligibility.

Q: Can I use these fuses in DC applications?

A: GSA 12 and GSA 12-R are rated for AC operation only. 0326012.MXDP is rated for both AC (250 V) and DC (60 V) operation. For DC applications, 0326012.MXDP is the appropriate selection.