BK/GMA-750MA Equivalent & Substitute Parts

Part Overview

The BK/GMA-750MA is a 750 mA, 250 V AC/DC fast-blow glass cartridge fuse in 5mm x 20mm form factor manufactured by Eaton - Electronics Division. This component is classified as obsolete product status. Identification of equivalent and substitute parts is necessary to maintain circuit protection functionality in applications where the original part is no longer available through standard distribution channels. All substitute parts listed maintain the same electrical ratings and mechanical form factor required for direct replacement in fuse holder assemblies.

Substiute Parts

BK/GMA-750MA

Eaton - Electronics DivisionIn Stock: 827BK/GMA-750MA Datasheet

Current PartRFQ

BK/GMA-750-R

Eaton - Electronics DivisionIn Stock: 1232BK/GMA-750-R Datasheet

DirectRFQ

GMA-750-R

Eaton - Electronics DivisionIn Stock: 1127GMA-750-R Datasheet

Parametric EquivalentRFQ

0034.3870

SCHURTER Inc.In Stock: 10180034.3870 Datasheet

DirectRFQ

FSC-750MA

OptiFuseIn Stock: 8122FSC-750MA Datasheet

Parametric EquivalentRFQ

FSD-750MA

OptiFuseIn Stock: 4678FSD-750MA Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BK/GMA-750MA is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Parameters:

• Current Rating: 750 mA
• Voltage Rating (AC): 250 V
• Fuse Type: Cartridge, Glass
• Response Time: Fast Blow
• Package / Case: 5mm x 20mm
• Mounting Type: Requires Holder

All substitute parts listed maintain identical values for these parameters. Substitute parts are grouped into two categories: direct manufacturer equivalents from Eaton - Electronics Division (BK/GMA-750-R and GMA-750-R) and parametric equivalents from alternative manufacturers (SCHURTER Inc., OptiFuse) that satisfy all mandatory equivalence criteria.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation - Eaton Direct Equivalents:

BK/GMA-750-R and GMA-750-R are direct manufacturer equivalents from Eaton - Electronics Division. Both parts maintain active product status and provide ROHS3 compliance, addressing the RoHS non-compliance status of the obsolete BK/GMA-750MA. These parts are preferred for applications requiring manufacturer continuity and established supply chain relationships.

Secondary Recommendation - SCHURTER Alternative:

0034.3870 (SCHURTER Inc., FSK 5x20 series) is a parametric equivalent with active product status and ROHS3 compliance. This part carries cULus approval and operates across -40°C to 85°C temperature range. Selection of this part is appropriate when SCHURTER supply chain availability is preferred or when extended operating temperature range is beneficial.

Tertiary Recommendation - OptiFuse Alternatives:

FSC-750MA and FSD-750MA (OptiFuse) are parametric equivalents with active product status and ROHS3 compliance. FSC-750MA provides higher breaking capacity (100A vs. 35A) and operates across -55°C to 90°C. FSD-750MA operates across -55°C to 125°C, providing the widest temperature range among all substitutes. Selection of OptiFuse parts is appropriate when higher breaking capacity or extended temperature operation is required by application specifications.

All substitute parts satisfy the mandatory equivalence parameters and are suitable for direct replacement in fuse holder assemblies designed for 5mm x 20mm cartridge fuses rated at 750 mA, 250 V AC/DC.

Frequently Asked Questions (FAQ)

Q: Can BK/GMA-750-R directly replace BK/GMA-750MA?

A: Yes. BK/GMA-750-R is a direct manufacturer equivalent from Eaton - Electronics Division. Both parts share identical electrical ratings (750 mA, 250 V AC/DC), fuse type (cartridge, glass), response time (fast blow), and mechanical form factor (5mm x 20mm). The primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant).

Q: What is the difference between GMA-750-R and BK/GMA-750-R?

A: Both are Eaton - Electronics Division GMA series 750 mA, 250 V fast-blow glass cartridge fuses in 5mm x 20mm form factor with active product status. GMA-750-R is listed with RoHS Compliant status, while BK/GMA-750-R is listed with ROHS3 Compliant status. Both are electrically and mechanically equivalent for replacement purposes.

Q: Are OptiFuse FSC-750MA and FSD-750MA interchangeable with the original BK/GMA-750MA?

A: Yes, both OptiFuse parts are parametric equivalents. FSC-750MA and FSD-750MA maintain the same current rating (750 mA), voltage rating (250 V AC), response time (fast blow), and mechanical form factor (5mm x 20mm). Both are ROHS3 compliant and carry appropriate safety certifications (cULus, UL 248 for FSC-750MA; cURus, IEC 60127 for FSD-750MA). Selection between these parts and Eaton equivalents depends on supply chain availability and application-specific requirements.

Q: What is the significance of breaking capacity differences among substitute parts?

A: Breaking capacity indicates the maximum fault current the fuse can safely interrupt at rated voltage. The original BK/GMA-750MA and most substitutes (BK/GMA-750-R, GMA-750-R, 0034.3870, FSD-750MA) are rated at 35A breaking capacity. FSC-750MA provides 100A breaking capacity. Selection of higher breaking capacity does not compromise circuit protection but provides additional safety margin in applications with higher available fault currents. Application circuit design determines whether higher breaking capacity is necessary.

Q: Does operating temperature range affect fuse selection?

A: Operating temperature range is provided for reference but does not affect substitution eligibility. The original BK/GMA-750MA does not specify operating temperature. SCHURTER 0034.3870 operates -40°C to 85°C, OptiFuse FSC-750MA operates -55°C to 90°C, and OptiFuse FSD-750MA operates -55°C to 125°C. Selection of a substitute with extended temperature range is appropriate only when application environment requires operation outside standard temperature conditions.

Q: Are all substitute parts available in the same packaging as the original?

A: The original BK/GMA-750MA is listed with packaging designation "-" (not specified). All substitute parts are available in bulk packaging. Packaging format does not affect electrical or mechanical equivalence. Procurement quantities and packaging preferences should be coordinated with supplier availability.