BK/GMD-3A Equivalent & Substitute Parts

Part Overview

The BK/GMD-3A is a 3 A, 250 V AC/DC glass cartridge fuse with a 5mm x 20mm form factor manufactured by Eaton - Electronics Division. This component is classified as obsolete, requiring identification of active equivalent alternatives for continued system support and procurement. The slow-blow response characteristic and 100 A breaking capacity at rated voltage define its application scope in circuit protection. Substitute parts must maintain identical electrical ratings, mechanical dimensions, and fuse response characteristics to ensure direct functional replacement without circuit redesign.

Key Parameters

Parameter	Value
Current Rating	3 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm
Response Time	Slow Blow
Breaking Capacity @ Rated Voltage	100 A
Mounting Type	Requires Holder
Size / Dimension	0.205" Dia x 0.787" L (5.20mm x 20.00mm)

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters: current rating (3 A), voltage rating (250 V AC), fuse type (cartridge glass), package dimensions (5mm x 20mm), response time (slow blow), and breaking capacity (100 A). All substitute parts listed maintain these core electrical and mechanical specifications. Substitutes are grouped by manufacturer: Eaton - Electronics Division (BK/GMD-3-R, BK1/GMD-3-R, GMD-3-R) and Littelfuse Inc. (0239003.HXP, 0239003.MXF11P, 0239003.MXF20P, 0239003.MXF34P, 0239003.MXP, 0239003.TXP, 0239003.VXP). All listed substitutes are active products with current manufacturing status, distinguishing them from the obsolete BK/GMD-3A.

Parameter Comparison

Part Number	Manufacturer	Current Rating (A)	Voltage Rating (V AC)	Package	Response Time	Breaking Capacity (A)	Product Status	RoHS Status
BK/GMD-3A	Eaton	3	250	5x20mm	Slow Blow	100	Obsolete	Non-compliant
BK/GMD-3-R	Eaton	3	250	5x20mm	Slow Blow	100	Active	ROHS3 Compliant
BK1/GMD-3-R	Eaton	3	250	5x20mm	Slow Blow	100	Active	ROHS3 Compliant
GMD-3-R	Eaton	3	250	5x20mm	Slow Blow	100	Active	ROHS3 Compliant
0239003.HXP	Littelfuse	3	250	5x20mm	Slow Blow	100	Active	ROHS3 Compliant
0239003.MXF11P	Littelfuse	3	250	5x20mm	Slow Blow	100	Active	ROHS3 Compliant
0239003.MXF20P	Littelfuse	3	250	5x20mm	Slow Blow	100	Active	ROHS3 Compliant
0239003.MXF34P	Littelfuse	3	250	5x20mm	Slow Blow	100	Active	ROHS3 Compliant
0239003.MXP	Littelfuse	3	250	5x20mm	Slow Blow	100	Active	ROHS3 Compliant
0239003.TXP	Littelfuse	3	250	5x20mm	Slow Blow	100	Active	ROHS3 Compliant
0239003.VXP	Littelfuse	3	250	5x20mm	Slow Blow	100	Active	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts are active products with current manufacturing status, providing long-term procurement stability compared to the obsolete BK/GMD-3A. Eaton-manufactured substitutes (BK/GMD-3-R, BK1/GMD-3-R, GMD-3-R) maintain the original manufacturer lineage and carry CSA, PSE/JET, and UL certifications. Littelfuse alternatives (0239003 series) provide expanded certification coverage including CE and KC approvals, with extended operating temperature range (-55°C to 125°C) and MSL rating of 1 (Unlimited). All substitutes are ROHS3 compliant and REACH unaffected, meeting modern regulatory requirements. Selection between Eaton and Littelfuse alternatives depends on existing supply chain relationships and certification requirements specific to the application.

Frequently Asked Questions (FAQ)

Q: Can BK/GMD-3A be directly replaced with any of the listed substitutes?

A: Yes. All listed substitutes maintain identical electrical ratings (3 A, 250 V AC), fuse type (cartridge glass), package dimensions (5mm x 20mm), response time (slow blow), and breaking capacity (100 A). Direct mechanical and electrical compatibility is confirmed.

Q: What is the difference between Eaton GMD-3-R variants (BK/GMD-3-R, BK1/GMD-3-R, GMD-3-R)?

A: All three Eaton variants are parametrically equivalent with identical electrical and mechanical specifications. Differences exist only in part number designation and packaging format. Selection among these variants depends on internal part numbering systems and inventory management practices.

Q: Why do Littelfuse 0239003 series parts have different suffixes (HXP, MXF11P, MXF20P, MXF34P, MXP, TXP, VXP)?

A: The suffix designations indicate internal Littelfuse product line variations. All variants maintain identical electrical ratings, dimensions, and response characteristics. Suffix differences reflect manufacturing process or packaging variations that do not affect functional performance in the circuit protection application.

Q: Are there compliance differences between Eaton and Littelfuse substitutes?

A: Eaton substitutes carry CSA, PSE/JET, and UL certifications. Littelfuse substitutes carry CE, CSA, KC, PSE, and UL certifications, providing broader geographic approval coverage. Both meet ROHS3 compliance and REACH requirements. Selection should align with application certification requirements.

Q: What is the significance of the operating temperature range in Littelfuse parts?

A: Littelfuse substitutes specify -55°C to 125°C operating temperature range, while Eaton parts do not specify this parameter in available data. For applications requiring extended temperature operation, Littelfuse alternatives provide documented performance across this range.

Q: Can the BK/GMD-3A be used interchangeably with these substitutes in existing designs?

A: Yes. Mechanical form factor (5mm x 20mm cartridge), electrical ratings (3 A, 250 V), and fuse response characteristics (slow blow) are identical across all parts. No circuit modifications or holder changes are required for substitution.

Q: What inventory levels are available for these substitutes?

A: Littelfuse 0239003.MXP maintains the highest inventory at 2,802 pieces. Eaton BK/GMD-3-R provides 1,525 pieces. All listed substitutes maintain active stock levels suitable for production and replacement applications.

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