Equivalent & Substitute Parts for BK/GMD-800MA

Part Overview

The BK/GMD-800MA is an 800 mA, 250 V AC/DC slow-blow glass cartridge fuse in a 5mm x 20mm package manufactured by Eaton - Electronics Division. This part is classified as obsolete and requires a holder for installation. Due to its obsolete status, equivalent and substitute parts from active product lines are necessary for ongoing system maintenance and new designs requiring compatible fuse protection.

Key Parameters

Parameter	Value
Current Rating	800 mA
Voltage Rating (AC)	250 V
Response Time	Slow Blow
Package / Case	5mm x 20mm
Fuse Type	Cartridge, Glass
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	35A

Substitute Part Grouping Explanation

Substitution for the BK/GMD-800MA is determined by strict equivalence across the following parameters:

Current Rating: 800 mA (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Response Time: Slow Blow (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Breaking Capacity @ Rated Voltage: 35A (exact match required)

All substitute parts listed maintain these core electrical and mechanical specifications. Variations in secondary parameters such as melting I²t, DC cold resistance, and approval agencies do not affect functional substitutability within the defined electrical envelope.

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage (AC)	Response Time	Package	Breaking Capacity	Product Status	RoHS Status
BK/GMD-800MA	Eaton	800 mA	250 V	Slow Blow	5x20mm	35A	Obsolete	Non-compliant
BK/GMD-800-R	Eaton	800 mA	250 V	Slow Blow	5x20mm	35A	Active	ROHS3 Compliant
BK/GDC-800MA	Eaton	800 mA	250 V	Slow Blow	5x20mm	35A	Active	RoHS Compliant
BK/S506-800-R	Eaton	800 mA	250 V	Slow Blow	5x20mm	35A	Active	ROHS3 Compliant
BK1/GMD-800-R	Eaton	800 mA	250 V	Slow Blow	5x20mm	35A	Active	ROHS3 Compliant
BK1/S506-800-R	Eaton	800 mA	250 V	Slow Blow	5x20mm	35A	Active	ROHS3 Compliant
GDC-800MA	Eaton	800 mA	250 V	Slow Blow	5x20mm	35A	Active	Not specified
GMD-800-R	Eaton	800 mA	250 V	Slow Blow	5x20mm	35A	Active	ROHS3 Compliant
S506-800-R	Eaton	800 mA	250 V	Slow Blow	5x20mm	35A	Active	ROHS3 Compliant
0239.800MXP	Littelfuse	800 mA	250 V	Slow Blow	5x20mm	35A	Active	ROHS3 Compliant
0239.800TXP	Littelfuse	800 mA	250 V	Slow Blow	5x20mm	35A	Active	ROHS3 Compliant

Engineering Selection Recommendations

Eaton Active Alternatives (Direct Manufacturer Continuity)

The Eaton GMD series active variants—BK/GMD-800-R, BK1/GMD-800-R, and GMD-800-R—provide direct series continuity from the obsolete BK/GMD-800MA. These parts maintain identical electrical specifications and are ROHS3 compliant, making them the primary choice for direct replacement in new designs and maintenance applications.

Eaton GDC Series (Alternative Eaton Line)

The BK/GDC-800MA and GDC-800MA represent an alternative Eaton product line with equivalent electrical performance. These parts carry broader international approval certifications (cULus, IMQ) and are RoHS compliant, suitable for applications requiring expanded regulatory coverage.

Eaton S506 Series (Broadest Certification Coverage)

The BK/S506-800-R, BK1/S506-800-R, and S506-800-R variants offer the most extensive approval agency coverage (BSI, CCC, CSA, cULus, IMQ, SEMKO, VDE), making them optimal for international applications and markets with stringent regulatory requirements.

Littelfuse 239 Series (Cross-Manufacturer Compatibility)

The 0239.800MXP and 0239.800TXP from Littelfuse provide functionally equivalent protection with active product status and ROHS3 compliance. These parts are suitable for applications where cross-manufacturer sourcing is acceptable and offer extended operating temperature range (-55°C to 125°C).

Frequently Asked Questions (FAQ)

Q: Can BK/GMD-800MA be directly replaced with any of the listed substitutes?

A: Yes. All listed substitute parts maintain the core electrical parameters: 800 mA current rating, 250 V AC voltage rating, slow-blow response time, 5mm x 20mm package, and 35A breaking capacity. Direct mechanical and electrical substitution is valid.

Q: What is the difference between Eaton GMD, GDC, and S506 series fuses?

A: All three series meet the specified electrical requirements. The primary differences are approval agency certifications and secondary electrical characteristics (melting I²t and DC cold resistance). The S506 series carries the broadest international certifications, while GMD and GDC series are optimized for specific regional markets.

Q: Are Littelfuse 0239.800MXP and 0239.800TXP interchangeable with Eaton parts?

A: Yes. Both Littelfuse parts meet all core electrical and mechanical specifications. The primary advantage is the extended operating temperature range (-55°C to 125°C) compared to Eaton variants. Cross-manufacturer substitution is electrically valid.

Q: Does RoHS compliance affect substitutability?

A: RoHS compliance does not affect electrical substitutability. The obsolete BK/GMD-800MA is RoHS non-compliant, while all active substitutes are RoHS compliant. For new designs and applications subject to RoHS regulations, active compliant variants are required.

Q: What holder is required for these 5mm x 20mm cartridge fuses?

A: All listed parts require a standard 5mm x 20mm fuse holder. The specific holder model depends on the application circuit design and is not specified in this reference. Verify holder compatibility with your equipment documentation.

Q: Can I use these fuses in AC-only or DC-only applications?

A: All listed parts are rated for 250 V AC/DC operation. They are suitable for both AC and DC circuits within the specified voltage envelope.

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