GSAP 125-R Equivalent & Substitute Parts

Part Overview

The GSAP 125-R is a 125 mA, 250 V AC/DC ceramic cartridge fuse manufactured by Bel Fuse Inc. in the 3AB, 3AG form factor with slow-blow response characteristics. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system maintenance and component procurement. The part operates across a temperature range of -55°C to 125°C and meets CE, CSA, and cULus approval standards.

Substiute Parts

GSAP 125-R

Bel Fuse Inc.In Stock: 985GSAP 125-R Datasheet

Current PartRFQ

0325.125MXP

Littelfuse Inc.In Stock: 8890325.125MXP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the GSAP 125-R is determined by strict equivalence across the following critical parameters:

• Current Rating: 125 mA (exact match required)
• Voltage Rating: 250 V AC (exact match required)
• Fuse Type: Ceramic cartridge (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)

The substitute part 0325.125MXP from Littelfuse Inc. meets all critical electrical and mechanical parameters for direct substitution. Both parts share identical current, voltage, fuse type, response characteristics, and physical form factor specifications.

Parameter Comparison

Engineering Selection Recommendations

The 0325.125MXP from Littelfuse Inc. is the direct equivalent substitute for the obsolete GSAP 125-R. Both components are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. The substitute part maintains active product status, ensuring continued availability and supply chain reliability. Dimensional tolerances between the two parts are within acceptable mechanical fit parameters for standard 3AB, 3AG through-hole fuse holders. CE approval certification is maintained on the substitute part, supporting compliance requirements for applications utilizing this fuse type.

Frequently Asked Questions (FAQ)

Q: Can the 0325.125MXP be used as a direct replacement for the GSAP 125-R?

A: Yes. Both parts share identical electrical ratings (125 mA, 250 V AC), fuse type (ceramic cartridge), response characteristics (slow blow), and physical form factor (3AB, 3AG, 1/4" x 1-1/4" axial). Dimensional variations are within acceptable tolerances for standard through-hole mounting.

Q: What is the primary reason for substitution?

A: The GSAP 125-R is classified as obsolete. The 0325.125MXP maintains active product status, ensuring reliable procurement and supply chain continuity.

Q: Are there compliance differences between the two parts?

A: Both parts are ROHS3 compliant and REACH unaffected. The GSAP 125-R carries CE, CSA, and cULus approvals, while the 0325.125MXP carries CE approval. Verify specific certification requirements for your application.

Q: Do the dimensional differences affect mechanical compatibility?

A: The dimensional differences (0.272" vs 0.275" diameter; 1.280" vs 1.288" length) are minor and fall within standard tolerances for 3AB, 3AG fuse holder specifications. No mechanical modification is required.

Q: What are the key parameters that must match for substitution?

A: Current rating, voltage rating, fuse type, response time, package form factor, and mounting type must all match exactly. These parameters determine functional equivalence in circuit protection applications.