Equivalent & Substitute Parts for BK/GMC-800MA Glass Cartridge Fuse

Part Overview

The BK/GMC-800MA is an 800 mA, 250 V AC/DC glass cartridge fuse manufactured by Eaton - Electronics Division in a 5mm x 20mm form factor. This fuse is classified as obsolete product status. Due to its obsolete classification, equivalent and substitute parts from active product lines are necessary to maintain circuit protection functionality in applications requiring 800 mA rated protection at 250 V AC.

The BK/GMC-800MA requires a fuse holder for installation and operates with medium blow response characteristics. Substitute parts must maintain electrical and mechanical compatibility with the original specification.

Key Parameters

Parameter	Value
Current Rating	800 mA
Voltage Rating - AC	250 V
Package / Case	5mm x 20mm
Fuse Type	Cartridge, Glass
Response Time	Medium Blow
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	35 A
DC Cold Resistance	0.18 Ohms
Melting I²t	0.85

Substitute Part Grouping Explanation

Substitute parts for the BK/GMC-800MA are grouped into two categories based on electrical parameter compatibility:

Category 1: Direct Electrical Equivalents (Eaton GMC Series) Parts BK/GMC-800-R, BK1/GMC-800-R, and GMC-800-R are direct equivalents manufactured by Eaton within the active GMC product line. These parts match all critical electrical parameters: 800 mA current rating, 250 V AC voltage rating, 5mm x 20mm package, medium blow response, 35 A breaking capacity, 0.18 Ohms DC cold resistance, and 0.85 Melting I²t. The primary distinction is product status (active versus obsolete) and RoHS compliance (ROHS3 compliant versus non-compliant).

Category 2: Parametric Equivalents (Cross-Manufacturer) Parts 0034.2515 (SCHURTER), 20108000001, 20108000001P, 20108000021, and 20108000021P (Littelfuse) are parametric equivalents that share the same current rating (800 mA), voltage rating (250 V AC), package dimensions (5mm x 20mm), fuse type (cartridge glass), response time (medium blow), and mounting requirement (requires holder). These parts differ in breaking capacity (80 A versus 35 A), melting I²t values (1.68 or 1.1 versus 0.85), and operating temperature ranges, but remain functionally compatible for 800 mA circuit protection applications at 250 V AC.

Substitution Logic: All substitute parts maintain the four critical parameters that define functional compatibility:

Current Rating: 800 mA
Voltage Rating - AC: 250 V
Package / Case: 5mm x 20mm
Fuse Type: Cartridge, Glass

Parameter Comparison

Part Number	Manufacturer	Current Rating (mA)	Voltage AC (V)	Package	Response Time	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ohms)	Product Status	RoHS Status
BK/GMC-800MA	Eaton	800	250	5x20mm	Medium Blow	35	0.85	0.18	Obsolete	Non-compliant
BK/GMC-800-R	Eaton	800	250	5x20mm	Medium Blow	35	0.85	0.18	Active	ROHS3 Compliant
BK1/GMC-800-R	Eaton	800	250	5x20mm	Medium Blow	35	0.85	0.18	Active	ROHS3 Compliant
GMC-800-R	Eaton	800	250	5x20mm	Medium Blow	35	0.85	0.18	Active	ROHS3 Compliant
0034.2515	SCHURTER	800	250	5x20mm	Medium Blow	80	1.68	—	Active	ROHS3 Compliant
20108000001	Littelfuse	800	250	5x20mm	Medium Blow	80	1.1	—	Active	ROHS3 Compliant
20108000001P	Littelfuse	800	250	5x20mm	Medium Blow	80	1.1	—	Active	ROHS3 Compliant
20108000021	Littelfuse	800	250	5x20mm	Medium Blow	80	1.1	—	Active	ROHS3 Compliant
20108000021P	Littelfuse	800	250	5x20mm	Medium Blow	80	1.1	—	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: Eaton GMC Series (BK/GMC-800-R, BK1/GMC-800-R, GMC-800-R)

The Eaton GMC series parts are the preferred substitutes for BK/GMC-800MA. These parts are manufactured by the same supplier as the original component, maintain identical electrical specifications (35 A breaking capacity, 0.85 Melting I²t, 0.18 Ohms DC cold resistance), and are classified as active products with ROHS3 compliance. All three variants (BK/GMC-800-R, BK1/GMC-800-R, GMC-800-R) are electrically and mechanically interchangeable with the original BK/GMC-800MA.

Secondary Recommendation: Littelfuse 201 Series (20108000001, 20108000001P, 20108000021, 20108000021P)

Littelfuse 201 series parts provide functional equivalence for 800 mA circuit protection at 250 V AC in the 5mm x 20mm package. These parts feature higher breaking capacity (80 A) and are certified by cULus. The 201 and 201P series variants differ in packaging designation but maintain identical electrical characteristics. Operating temperature range is -25°C to 70°C.

Alternative Recommendation: SCHURTER FSM 5x20 (0034.2515)

The SCHURTER 0034.2515 provides parametric equivalence with 800 mA current rating and 250 V AC voltage rating in the 5mm x 20mm package. This part features the highest breaking capacity (80 A) and extended operating temperature range (-40°C to 85°C). The 0034.2515 includes 125 V DC voltage rating capability, providing additional flexibility for dual-voltage applications.

Compliance Consideration:

All substitute parts are ROHS3 compliant and classified as active products, addressing the obsolete status of the original BK/GMC-800MA. Selection should prioritize application requirements regarding breaking capacity, operating temperature range, and voltage rating specifications.

Frequently Asked Questions (FAQ)

Q: Can BK/GMC-800-R, BK1/GMC-800-R, and GMC-800-R be used interchangeably with BK/GMC-800MA?

A: Yes. These three Eaton GMC series parts are direct electrical and mechanical equivalents. All parameters match the original specification: 800 mA current rating, 250 V AC voltage rating, 5mm x 20mm package, medium blow response, 35 A breaking capacity, and 0.18 Ohms DC cold resistance. The primary difference is product status (active versus obsolete) and RoHS compliance level.

Q: What is the difference between Littelfuse 201 and 201P series fuses?

A: The 201 and 201P series maintain identical electrical specifications for 800 mA, 250 V AC applications. The designation difference reflects packaging or distribution channel variations. Both series are cULus certified, ROHS3 compliant, and feature 80 A breaking capacity with 1.1 Melting I²t.

Q: Can SCHURTER 0034.2515 replace BK/GMC-800MA in all applications?

A: The SCHURTER 0034.2515 is a parametric equivalent for 800 mA, 250 V AC circuit protection in the 5mm x 20mm package. The primary differences are higher breaking capacity (80 A versus 35 A), higher Melting I²t (1.68 versus 0.85), and extended operating temperature range (-40°C to 85°C versus unspecified). These characteristics make it suitable for applications requiring enhanced fault tolerance or wider temperature operation.

Q: What does "requires holder" mean for these fuse cartridges?

A: All listed fuse cartridges are designed for installation in a dedicated fuse holder. The 5mm x 20mm form factor requires a compatible holder assembly. The fuse cartridge itself does not provide electrical connection; the holder provides the mechanical retention and electrical contact interface.

Q: Are there voltage rating differences between substitute parts?

A: All substitute parts maintain 250 V AC rating. The SCHURTER 0034.2515 additionally specifies 125 V DC rating, providing dual-voltage capability. Littelfuse and Eaton parts are rated for AC/DC operation at 250 V without separate DC voltage specification.

Q: What is the significance of Melting I²t values in fuse selection?

A: Melting I²t indicates the thermal energy required to melt the fuse element. The original BK/GMC-800MA has 0.85 Melting I²t. Littelfuse parts have 1.1 Melting I²t, and SCHURTER has 1.68 Melting I²t. Higher values indicate slower thermal response. For direct replacement, Eaton GMC series (0.85 Melting I²t) provides the closest match. Cross-manufacturer substitutes with higher Melting I²t values remain functionally compatible for 800 mA protection but exhibit different thermal response characteristics.

Q: What certifications apply to these fuse cartridges?

A: The original BK/GMC-800MA carries CSA, KC-MARK, and UL approvals. Eaton GMC series substitutes maintain CSA, KC-MARK, and UL certifications. Littelfuse 201 series parts are cULus certified. SCHURTER 0034.2515 does not list specific approval agencies in the provided data. Application requirements may dictate specific certification needs.

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