GMA-300-R Equivalent & Substitute Parts Reference

Part Overview

The GMA-300-R is a 300 mA fast-blow glass cartridge fuse rated for 250 V AC/DC operation in a 5mm x 20mm package form factor. Manufactured by Eaton - Electronics Division, this component is classified as Active product status and requires a fuse holder for installation. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, response characteristics, and approval certifications to ensure direct functional interchangeability in circuit protection applications.

Substiute Parts

GMA-300-R

Eaton - Electronics DivisionIn Stock: 840GMA-300-R Datasheet

Current PartRFQ

BK/GMA-300-R

Eaton - Electronics DivisionIn Stock: 1541BK/GMA-300-R Datasheet

DirectRFQ

0235.300HXP

Littelfuse Inc.In Stock: 10230235.300HXP Datasheet

DirectRFQ

0235.300MXP

Littelfuse Inc.In Stock: 16000235.300MXP Datasheet

DirectRFQ

FSC-300MA

OptiFuseIn Stock: 2194FSC-300MA Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the GMA-300-R are classified into two categories based on substitution type and parameter alignment:

Direct Manufacturer Equivalents (Eaton - Electronics Division): BK/GMA-300-R is a direct equivalent from the same manufacturer within the GMA series. All electrical parameters, mechanical dimensions, response characteristics, and approval certifications are identical to the main part. This substitute provides alternative sourcing within the same product line.

Cross-Manufacturer Substitutes (Littelfuse Inc. - 235 Series): 0235.300HXP and 0235.300MXP are cross-manufacturer substitutes from Littelfuse Inc. These parts match the core substitution criteria: 300 mA current rating, 250 V AC voltage rating, fast-blow response, 5mm x 20mm package dimensions, 35A breaking capacity, and equivalent approval certifications (CE, CSA, KC, UL). Operating temperature range extends to -55°C ~ 125°C. These parts are interchangeable based on electrical and mechanical parameters.

Parametric Equivalent (OptiFuse - FSC Series): FSC-300MA is classified as a parametric equivalent. It matches all primary electrical specifications (300 mA, 250 V AC, fast-blow, 5mm x 20mm) and mechanical form factor. Breaking capacity is rated at 100A, exceeding the minimum 35A requirement. Operating temperature range is -55°C ~ 90°C. Approval certifications include cULus and UL 248. This part provides functional equivalence with enhanced breaking capacity performance.

Substitution Criteria:

• Current Rating: 300 mA (exact match required)
• Voltage Rating: 250 V AC (exact match required)
• Package Dimensions: 5mm x 20mm (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Fast Blow (exact match required)
• Breaking Capacity: Minimum 35A (equal or greater acceptable)
• Approval Agencies: UL certification required; additional certifications (CSA, CE, KC, PSE, cULus) acceptable

Parameter Comparison

Engineering Selection Recommendations

Primary Selection - BK/GMA-300-R: BK/GMA-300-R is the recommended first choice for direct replacement. As a direct manufacturer equivalent from Eaton - Electronics Division within the GMA series, it provides identical electrical performance, mechanical compatibility, and approval certifications. Product status is Active with 1452 units in stock.

Secondary Selection - 0235.300HXP or 0235.300MXP: Littelfuse 235 series substitutes (0235.300HXP and 0235.300MXP) are suitable alternatives when primary selection is unavailable. Both parts meet all core electrical and mechanical requirements with identical current, voltage, and package specifications. Extended operating temperature range (-55°C ~ 125°C) provides broader environmental compatibility. Approval certifications include CE, CSA, KC, and UL. Product status is Active with 944 and 1493 units in stock respectively.

Tertiary Selection - FSC-300MA: FSC-300MA from OptiFuse is a parametric equivalent suitable for applications requiring enhanced breaking capacity (100A versus 35A minimum). All primary electrical specifications and mechanical dimensions match the GMA-300-R. Operating temperature range is -55°C ~ 90°C. Approval certifications include cULus and UL 248. Product status is Active with 2101 units in stock.

Compliance Considerations: All substitute parts maintain RoHS3 compliance status. Selection should account for specific approval agency requirements in the target application. The GMA-300-R and BK/GMA-300-R include PSE certification; Littelfuse parts include CE and KC certifications; OptiFuse includes cULus certification. UL certification is common across all options.

Frequently Asked Questions (FAQ)

Q: Can BK/GMA-300-R be used as a direct replacement for GMA-300-R? A: Yes. BK/GMA-300-R is a direct manufacturer equivalent from Eaton - Electronics Division. All electrical ratings (300 mA, 250 V AC), mechanical dimensions (5mm x 20mm), response characteristics (fast-blow), and approval certifications are identical. No circuit modifications are required.

Q: What is the difference between the Littelfuse 0235.300HXP and 0235.300MXP? A: Both parts are functionally equivalent with identical electrical specifications (300 mA, 250 V AC, fast-blow, 5mm x 20mm) and approval certifications (CE, CSA, KC, UL). The primary difference is internal design variation within the Littelfuse 235 series. Both are suitable substitutes for the GMA-300-R.

Q: Can FSC-300MA be used in place of GMA-300-R? A: Yes. FSC-300MA meets all core substitution criteria: 300 mA current rating, 250 V AC voltage rating, fast-blow response, and 5mm x 20mm package dimensions. The breaking capacity is 100A, which exceeds the 35A minimum requirement. Operating temperature range is -55°C ~ 90°C. Approval certifications include cULus and UL 248.

Q: Are there any mechanical compatibility issues when substituting these parts? A: No. All substitute parts share identical package dimensions (5mm x 20mm) and mounting type (requires holder). Physical installation in existing fuse holders is directly compatible without modification.

Q: What is the significance of the breaking capacity difference between GMA-300-R (35A) and FSC-300MA (100A)? A: Breaking capacity indicates the maximum fault current the fuse can safely interrupt at rated voltage. FSC-300MA's higher breaking capacity (100A) provides enhanced performance margin in high-fault-current applications. For applications designed around the 35A minimum specification, both parts are functionally equivalent.

Q: Which substitute part should be selected for extended temperature operation? A: Littelfuse 0235.300HXP and 0235.300MXP both support operating temperature range of -55°C ~ 125°C, providing the broadest thermal compatibility. The GMA-300-R and BK/GMA-300-R do not specify operating temperature limits. FSC-300MA operates to -55°C ~ 90°C.

Q: Are all substitute parts RoHS compliant? A: Yes. All substitute parts maintain ROHS3 compliance status. The original GMA-300-R is RoHS Compliant. Cross-manufacturer substitutes (Littelfuse and OptiFuse) are ROHS3 Compliant, representing current RoHS directive compliance.

Q: What approval certifications are critical for my application? A: UL certification is present on all substitute options. If PSE certification is required, GMA-300-R or BK/GMA-300-R must be selected. If CE or KC certifications are required, Littelfuse 235 series parts (0235.300HXP, 0235.300MXP) are appropriate. If cULus certification is required, FSC-300MA is the suitable choice.