GMA-8A Equivalent & Substitute Parts Reference

Part Overview

The GMA-8A is a glass cartridge fuse rated at 8 A, 125 V AC/DC with a 5mm x 20mm form factor, manufactured by Eaton - Electronics Division. This fuse is designed for use in applications requiring fast-blow response characteristics and operates within the GMA series product line. The part requires a compatible fuse holder for installation. Substitute parts are identified based on matching electrical ratings, mechanical dimensions, response characteristics, and approval certifications to ensure direct functional equivalence in circuit protection applications.

Substiute Parts

GMA-8A

Eaton - Electronics DivisionIn Stock: 1140GMA-8A Datasheet

Current PartRFQ

GMA-8-R

Eaton - Electronics DivisionIn Stock: 796GMA-8-R Datasheet

DirectRFQ

BK/GMA-8-R

Eaton - Electronics DivisionIn Stock: 3305BK/GMA-8-R Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the GMA-8A are identified through parametric equivalence across all critical electrical and mechanical specifications. The substitution logic is based on the following matching criteria:

Electrical Parameters:

• Current Rating: 8 A (exact match required)
• Voltage Rating (AC): 125 V (exact match required)
• Response Time: Fast Blow (exact match required)
• Breaking Capacity @ Rated Voltage: 200 A (exact match required)
• Melting I²t: 280 (exact match required)
• DC Cold Resistance: 0.009 Ohms (exact match required)

Mechanical Parameters:

• Fuse Type: Cartridge, Glass (exact match required)
• Package / Case: 5mm x 20mm (exact match required)
• Mounting Type: Requires Holder (exact match required)

Compliance Parameters:

• Approval Agencies: CSA, PSE, UL (minimum requirement)
• RoHS Status: Compliant (required)

All substitute parts listed below satisfy these criteria and are therefore electrically and mechanically interchangeable with the GMA-8A in applications requiring 8 A, 125 V AC/DC circuit protection with fast-blow characteristics.

Parameter Comparison

Engineering Selection Recommendations

All three parts—GMA-8A, GMA-8-R, and BK/GMA-8-R—are active products manufactured by Eaton - Electronics Division and carry identical electrical and mechanical specifications. Selection among these parts should be based on the following factors:

Availability: BK/GMA-8-R offers the highest inventory level at 3271 pieces, followed by GMA-8A at 1037 pieces, and GMA-8-R at 688 pieces.

Compliance: All parts meet CSA, PSE, and UL approval requirements. BK/GMA-8-R carries ROHS3 compliance, while GMA-8A and GMA-8-R carry standard RoHS compliance. Both compliance levels are acceptable for circuit protection applications.

Packaging: GMA-8-R and BK/GMA-8-R are supplied in bulk packaging, while GMA-8A packaging specification is not provided in the input data.

Functional Equivalence: All three parts are direct substitutes and will perform identically in 8 A, 125 V AC/DC fast-blow circuit protection applications requiring a 5mm x 20mm cartridge fuse form factor.

Frequently Asked Questions (FAQ)

Q: Can GMA-8-R be used as a direct replacement for GMA-8A?

A: Yes. GMA-8-R is a direct substitute for GMA-8A. Both parts share identical electrical ratings (8 A, 125 V AC/DC), response characteristics (fast-blow), mechanical dimensions (5mm x 20mm), and approval certifications (CSA, PSE, UL).

Q: What is the difference between GMA-8-R and BK/GMA-8-R?

A: GMA-8-R and BK/GMA-8-R are electrically and mechanically identical. The primary difference is RoHS compliance level: GMA-8-R carries standard RoHS compliance, while BK/GMA-8-R carries ROHS3 compliance. Both are acceptable for circuit protection applications.

Q: Are these fuses suitable for both AC and DC applications?

A: Yes. All three parts are rated for 125 V AC/DC operation and are suitable for both alternating and direct current applications within the specified voltage and current parameters.

Q: What is the significance of the 5mm x 20mm form factor?

A: The 5mm x 20mm dimension specifies the physical size of the cartridge fuse. This form factor determines compatibility with fuse holders designed for this size. All substitute parts share this identical dimension and are therefore mechanically interchangeable.

Q: Do these fuses require a holder for installation?

A: Yes. All three parts require a compatible fuse holder for installation. The fuse holder must be designed to accommodate the 5mm x 20mm cartridge form factor.

Q: What does "Fast Blow" response time mean?

A: Fast Blow indicates that the fuse will open quickly when current exceeds the rated 8 A threshold. This response characteristic is identical across all three parts and is suitable for applications requiring rapid circuit protection.

Q: Are there any differences in breaking capacity among these parts?

A: No. All three parts have an identical breaking capacity of 200 A at rated voltage (125 V), indicating they can safely interrupt fault currents up to this level.