GSAP 750-R Ceramic Fuse Equivalent & Substitute Parts

Part Overview

The GSAP 750-R is a 750 mA, 250 V AC ceramic cartridge fuse manufactured by Bel Fuse Inc. in the 3AB, 3AG form factor (1/4" x 1-1/4" axial). This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for system maintenance and component sourcing.

The fuse is designed for through-hole mounting applications requiring slow-blow response characteristics with ceramic construction. Its obsolete status necessitates evaluation of active substitute components that maintain electrical and mechanical compatibility.

Substiute Parts

GSAP 750-R

Bel Fuse Inc.In Stock: 825GSAP 750-R Datasheet

Current PartRFQ

0325.750MXP

Littelfuse Inc.In Stock: 9830325.750MXP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the GSAP 750-R 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" (Axial) (exact match required)
• Mounting Type: Through Hole (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (minimum requirement)

The substitute part 0325.750MXP manufactured by Littelfuse Inc. meets all critical substitution criteria. This part maintains identical current rating, AC voltage rating, ceramic cartridge construction, slow-blow response, and 3AB/3AG axial package format. Physical dimensions remain within acceptable tolerance, and operating temperature range is equivalent.

Parameter Comparison

Engineering Selection Recommendations

The 0325.750MXP from Littelfuse Inc. is a direct functional equivalent for the obsolete GSAP 750-R. Both components share identical electrical ratings for AC operation (750 mA, 250 V) and maintain the same ceramic cartridge construction with slow-blow response characteristics.

The substitute part carries active product status, ensuring continued availability and supply chain reliability. Both components hold equivalent regulatory approvals (CE, CSA) and maintain ROHS3 compliance and REACH unaffected status, satisfying environmental and regulatory requirements.

Physical dimensions are within acceptable tolerance for through-hole mounting applications. The 0325.750MXP provides enhanced breaking capacity (100A AC versus 35A) and includes DC voltage rating specification (125 V DC), offering expanded application flexibility without compromising AC circuit protection performance.

Frequently Asked Questions (FAQ)

Q: Can the 0325.750MXP directly replace the GSAP 750-R in existing circuits?

A: Yes. Both components share identical current rating (750 mA), AC voltage rating (250 V), ceramic cartridge construction, slow-blow response, and 3AB/3AG axial package format. Physical dimensions are within acceptable tolerance for through-hole mounting. No circuit modifications are required.

Q: What is the significance of the DC voltage rating difference?

A: The GSAP 750-R does not specify a DC voltage rating. The 0325.750MXP specifies 125 V DC rating. For AC-only applications, this difference is not relevant. For circuits requiring DC protection, the 0325.750MXP provides explicit DC rating specification.

Q: How do the melting I²t values affect substitution?

A: The GSAP 750-R has melting I²t of 10; the 0325.750MXP has melting I²t of 7. Both values fall within the slow-blow fuse category. The lower I²t of the substitute indicates slightly faster thermal response. For applications with specific I²t requirements, circuit performance should be evaluated against the actual application profile.

Q: Are there compliance differences between the two parts?

A: Both components hold CE and CSA approvals. The GSAP 750-R includes cULus certification; the 0325.750MXP holds UL certification. Both maintain ROHS3 compliance and REACH unaffected status. Certification differences are minimal for standard industrial applications.

Q: What is the physical dimension tolerance between these parts?

A: The GSAP 750-R measures 0.272" Dia x 1.280" L (6.90mm x 32.50mm). The 0325.750MXP measures 0.275" Dia x 1.288" L (6.99mm x 32.72mm). Differences are approximately 0.003" in diameter and 0.008" in length, within standard mechanical tolerance for 3AB/3AG cartridge fuses and compatible with existing through-hole mounting.

Q: Why does the substitute have higher breaking capacity?

A: The 0325.750MXP specifies 100A AC and 10kA DC breaking capacity compared to the GSAP 750-R's 35A. Enhanced breaking capacity indicates improved fault current handling capability. This does not affect normal circuit operation and provides additional safety margin in fault conditions.