GSAP 3-R Ceramic Fuse - Equivalent & Substitute Parts

Part Overview

The GSAP 3-R is a 3A 250VAC ceramic cartridge fuse manufactured by Bel Fuse Inc., designed for through-hole mounting in 3AB and 3AG package configurations. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system maintenance and new design implementations. Substitute parts must maintain identical electrical ratings, mechanical dimensions, and approval certifications to ensure direct compatibility without circuit redesign.

Substiute Parts

GSAP 3-R

Bel Fuse Inc.In Stock: 763GSAP 3-R Datasheet

Current PartRFQ

0325003.MXP

Littelfuse Inc.In Stock: 11590325003.MXP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the GSAP 3-R is determined by the following critical parameters:

• Current Rating: 3 A (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" (Axial) (exact match required)
• Mounting Type: Through Hole (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (minimum requirement)
• Approval Certifications: CE, CSA, cULus, PSE (baseline requirement)

The substitute part 0325003.MXP manufactured by Littelfuse Inc. meets all mandatory electrical and mechanical parameters for direct substitution. Additional DC voltage rating and enhanced breaking capacity in the substitute part do not preclude compatibility in AC-primary applications.

Parameter Comparison

Engineering Selection Recommendations

The 0325003.MXP from Littelfuse Inc. is the qualified substitute for the obsolete GSAP 3-R. Selection rationale is based on:

• Identical AC voltage and current ratings (250V, 3A)
• Matching ceramic cartridge fuse type with slow-blow response
• Identical 3AB/3AG package and through-hole mounting configuration
• Mechanical dimensions within acceptable tolerance (0.003" diameter variance, 0.008" length variance)
• Active product status ensuring ongoing availability and supply chain continuity
• Comprehensive approval certifications (CE, CSA, K-MARK, PSE, UL) exceeding the original part's baseline requirements
• DC voltage rating and enhanced breaking capacity provide additional operational margin without introducing incompatibility

The marginal increase in melting I²t (200 vs. 146) and DC cold resistance (0.0605 vs. 0.058 Ohms) remain within acceptable engineering tolerances for AC circuit protection applications.

Frequently Asked Questions (FAQ)

Q: Can the 0325003.MXP be used as a direct replacement for GSAP 3-R in existing circuit boards?

A: Yes. The substitute part maintains identical current rating (3A), AC voltage rating (250V), fuse type (ceramic cartridge), response time (slow blow), and package configuration (3AB/3AG, 1/4" x 1-1/4"). Mechanical dimensions are within acceptable tolerance. No circuit redesign or board modification is required.

Q: What is the significance of the DC voltage rating on the substitute part?

A: The 0325003.MXP includes a 125V DC rating, whereas the original GSAP 3-R does not specify DC voltage capability. This additional rating does not affect AC circuit operation and provides expanded application flexibility without compromising AC protection performance.

Q: How do the melting I²t values affect substitution compatibility?

A: The melting I²t parameter (146 for GSAP 3-R vs. 200 for 0325003.MXP) indicates thermal energy dissipation characteristics. The higher value in the substitute part represents a slightly slower thermal response, which remains compatible with slow-blow fuse applications and does not introduce nuisance tripping in properly designed circuits.

Q: Are the dimensional tolerances between parts acceptable for mechanical fit?

A: Yes. The diameter variance (0.272" vs. 0.275") and length variance (1.280" vs. 1.288") are within standard manufacturing tolerances for 3AB/3AG cartridge fuses and do not affect mechanical fit in standard fuse holders.

Q: What certifications should be verified for the substitute part?

A: The 0325003.MXP carries CE, CSA, K-MARK, PSE, and UL certifications. These exceed the original part's baseline certifications (CE, CSA, cULus, PSE) and confirm compliance with applicable safety standards for ceramic cartridge fuses.

Q: Is the substitute part currently available?

A: Yes. The 0325003.MXP is classified as active product status with documented inventory availability, ensuring reliable supply for both replacement and new design applications.