GMC-80MA Equivalent & Substitute Parts Reference

Part Overview

The GMC-80MA is a glass cartridge fuse manufactured by Eaton - Electronics Division, rated for 80 mA at 125 V AC/DC with a 5mm x 20mm form factor. This component is classified as obsolete, indicating discontinued production and limited availability for new designs. The fuse requires an external holder for installation and is approved by CSA, KC, and UL standards. Due to its obsolete status, identification of compatible substitute parts is necessary for system maintenance, repair, and component sourcing.

Substiute Parts

GMC-80MA

Eaton - Electronics DivisionIn Stock: 948GMC-80MA Datasheet

Current PartRFQ

GMC-80-R

Eaton - Electronics DivisionIn Stock: 1105GMC-80-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the GMC-80MA is limited to components that maintain identical electrical and mechanical characteristics within the allowed parameter set. The primary substitute identified is the GMC-80-R, which shares the following critical parameters:

Matching Parameters:

• Current Rating: 80 mA (identical)
• Package / Case: 5mm x 20mm (identical)
• Fuse Type: Cartridge, Glass (identical)
• Response Time: Medium Blow (identical)
• Breaking Capacity @ Rated Voltage: 35 A (identical)
• Melting I²t: 0.005 (identical)
• Mounting Type: Requires Holder (identical)

Differing Parameter:

• Voltage Rating - AC: GMC-80MA rated 125 V; GMC-80-R rated 250 V

The GMC-80-R operates at a higher voltage rating (250 V AC) while maintaining all other electrical and mechanical specifications. This difference permits substitution in applications where the circuit voltage does not exceed the original 125 V specification, as the higher-rated component provides equivalent or superior performance at lower voltages.

Parameter Comparison

Engineering Selection Recommendations

The GMC-80-R is the direct substitute for the obsolete GMC-80MA based on electrical and mechanical parameter equivalence. Selection criteria are as follows:

Voltage Consideration: The GMC-80-R is rated for 250 V AC, exceeding the GMC-80MA's 125 V rating. In circuits operating at or below 125 V AC, the GMC-80-R provides functionally equivalent protection with no performance degradation. The higher voltage rating does not compromise circuit protection at lower voltages.

Product Status: The GMC-80MA is obsolete with no ongoing production. The GMC-80-R is active production, ensuring long-term availability and supply chain reliability for replacement and maintenance applications.

Compliance: The GMC-80-R meets ROHS3 compliance requirements, whereas the GMC-80MA is non-compliant. For applications subject to RoHS regulations, the GMC-80-R is the required selection.

Certifications: Both components carry equivalent approval agencies (CSA, KC, UL), confirming regulatory acceptance for the same application domains.

Physical Compatibility: Identical 5mm x 20mm form factor and holder mounting requirements ensure direct mechanical substitution without modification to existing installations.

Frequently Asked Questions (FAQ)

Q: Can the GMC-80-R replace the GMC-80MA in a 125 V circuit?

A: Yes. The GMC-80-R is rated for 250 V AC and operates safely at 125 V AC. The higher voltage rating does not affect performance at lower voltages. All other electrical parameters (current, response time, breaking capacity, melting I²t) are identical.

Q: Are the physical dimensions identical between GMC-80MA and GMC-80-R?

A: Yes. Both components are 5mm x 20mm (0.205" Dia x 0.787" L) and require the same holder. Direct mechanical substitution is possible without modification.

Q: What is the significance of the different voltage ratings?

A: The GMC-80MA is rated for maximum 125 V AC operation. The GMC-80-R is rated for maximum 250 V AC operation. In applications where circuit voltage does not exceed 125 V, the GMC-80-R provides equivalent protection. The substitute's higher rating does not degrade performance at lower voltages.

Q: Why is RoHS compliance important for this substitution?

A: The GMC-80MA is RoHS non-compliant, while the GMC-80-R is ROHS3 compliant. Applications subject to RoHS regulations (EU Directive 2011/65/EU and amendments) require the compliant GMC-80-R. For non-regulated applications, either component is acceptable from a functional standpoint.

Q: Are both components approved by the same regulatory agencies?

A: Both carry CSA, KC, and UL approvals. The GMC-80-R includes KC-MARK designation. Regulatory acceptance is equivalent for both components in their respective voltage ratings.

Q: What is the current rating tolerance, and does it affect substitution?

A: Both components are rated for 80 mA with identical melting I²t of 0.005. Current rating and thermal response are identical, ensuring equivalent circuit protection characteristics.

Q: Can the GMC-80-R be used in applications rated above 125 V but below 250 V?

A: Yes. The GMC-80-R is rated for 250 V AC and operates safely at any voltage up to its maximum rating. Applications operating at 125 V, 150 V, or any voltage below 250 V AC can use the GMC-80-R without performance compromise.