GSAP 500-R Equivalent & Substitute Parts

Part Overview

The GSAP 500-R is a 500 mA, 250 V AC ceramic cartridge fuse manufactured by Bel Fuse Inc. in a 3AB, 3AG form factor (1/4" x 1-1/4" axial). This fuse is classified as obsolete, making identification of functionally equivalent substitute parts essential for system maintenance, repair, and new design implementations where this component is specified.

Substiute Parts

GSAP 500-R

Bel Fuse Inc.In Stock: 937GSAP 500-R Datasheet

Current PartRFQ

0325.500MXP

Littelfuse Inc.In Stock: 11110325.500MXP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the GSAP 500-R is determined by strict equivalence in the following parameters:

• Current Rating: 500 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 (exact match required)

The substitute part 0325.500MXP manufactured by Littelfuse Inc. meets all these core electrical and mechanical parameters, enabling direct functional replacement in applications where the GSAP 500-R is specified.

Parameter Comparison

Engineering Selection Recommendations

The 0325.500MXP from Littelfuse Inc. is the direct functional equivalent for the obsolete GSAP 500-R. Both components share identical electrical ratings (500 mA, 250 V AC), fuse type (ceramic cartridge), response characteristic (slow blow), and mechanical form factor (3AB, 3AG, 1/4" x 1-1/4" axial).

The 0325.500MXP carries active product status, ensuring ongoing availability and supply chain continuity. Both parts maintain ROHS3 compliance and REACH unaffected status, meeting current environmental and regulatory requirements.

Approval agency coverage differs slightly: the GSAP 500-R holds CE, CSA, and cULus certifications, while the 0325.500MXP holds CE, CSA, and UL certifications. Both certifications satisfy standard industrial and commercial safety requirements.

The 0325.500MXP provides enhanced breaking capacity (100 A AC, 10 kA DC versus 35 A) and lower melting I²t (2.5 versus 4.4), representing improved performance characteristics within the same package and electrical rating envelope.

Frequently Asked Questions (FAQ)

Q: Can the 0325.500MXP directly replace the GSAP 500-R in existing applications?

A: Yes. Both components share identical current rating (500 mA), AC voltage rating (250 V), fuse type (ceramic cartridge), response time (slow blow), package form factor (3AB, 3AG, 1/4" x 1-1/4" axial), and operating temperature range (-55°C ~ 125°C). Physical and electrical compatibility is confirmed.

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

A: The GSAP 500-R does not specify a DC voltage rating. The 0325.500MXP specifies 125 V DC. In AC-only applications, this difference is not relevant. In applications requiring DC operation, the 0325.500MXP provides explicit DC rating coverage.

Q: How do the breaking capacity and melting I²t differences affect substitution?

A: The 0325.500MXP exhibits higher breaking capacity (100 A AC, 10 kA DC) and lower melting I²t (2.5) compared to the GSAP 500-R (35 A breaking capacity, 4.4 melting I²t). These represent improved performance margins and faster response characteristics, both favorable for system protection.

Q: Are there compliance or certification concerns with substitution?

A: Both components maintain ROHS3 compliance and REACH unaffected status. Certification coverage differs slightly (cULus versus UL), but both satisfy standard industrial safety requirements. No compliance barriers exist for substitution.

Q: Is the 0325.500MXP currently available?

A: Yes. The 0325.500MXP carries active product status, ensuring ongoing manufacturing and supply availability, unlike the obsolete GSAP 500-R.