Equivalent & Substitute Parts for BK/GDC-800MA

Part Overview

The BK/GDC-800MA is an 800 mA, 250 V AC/DC slow-blow glass fuse cartridge manufactured by Eaton - Electronics Division. This component is a 5mm x 20mm cartridge fuse requiring a holder for installation. The part maintains Active product status and is RoHS Compliant with cULus and IMQ approval certifications. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity for applications requiring 800 mA protection at 250 V AC/DC with slow-blow response characteristics.

Key Parameters

Parameter	Value
Current Rating	800 mA
Voltage Rating - AC	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	5mm x 20mm
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	35A
Size / Dimension	0.205" Dia x 0.787" L (5.20mm x 20.00mm)

Substitute Part Grouping Explanation

Substitute parts for the BK/GDC-800MA are classified based on strict electrical and mechanical parameter alignment. All substitute parts share the following critical parameters:

Current Rating: 800 mA
Voltage Rating - AC: 250 V
Fuse Type: Cartridge, Glass
Response Time: Slow Blow
Package / Case: 5mm x 20mm
Mounting Type: Requires Holder
Breaking Capacity @ Rated Voltage: 35A
Size / Dimension: 0.205" Dia x 0.787" L (5.20mm x 20.00mm)

Substitution is permitted when all electrical parameters and physical dimensions match the main part specification. Variations in secondary parameters such as Melting I²t, DC Cold Resistance, approval agencies, and operating temperature ranges do not preclude substitution when the primary electrical and mechanical criteria are satisfied.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Series	Current Rating (Amps)	Voltage Rating - AC	Response Time	Package / Case	Breaking Capacity @ Rated Voltage	Melting I²t	DC Cold Resistance (Ohms)	Product Status
BK/GDC-800MA	Eaton - Electronics Division	GDC	800 mA	250 V	Slow Blow	5mm x 20mm	35A	2.78	0.129	Active
BK/S506-800-R	Eaton - Electronics Division	S506	800 mA	250 V	Slow Blow	5mm x 20mm	35A	2.78	0.129	Active
BK/GMD-800-R	Eaton - Electronics Division	GMD	800 mA	250 V	Slow Blow	5mm x 20mm	35A	6.6	0.4475	Active
BK1/S506-800-R	Eaton - Electronics Division	S506	800 mA	250 V	Slow Blow	5mm x 20mm	35A	2.78	0.129	Active
S506-800-R	Eaton - Electronics Division	S506	800 mA	250 V	Slow Blow	5mm x 20mm	35A	2.78	0.129	Active
0034.3116	SCHURTER Inc.	FST 5x20	800 mA	250 V	Slow Blow	5mm x 20mm	35A	3.85	Not Specified	Active
0218.800MXP	Littelfuse Inc.	218	800 mA	250 V	Slow Blow	5mm x 20mm	35A	3.37	0.0813	Active
0218.800TXP	Littelfuse Inc.	218	800 mA	250 V	Slow Blow	5mm x 20mm	35A	3.37	0.0813	Active
0034.3774	SCHURTER Inc.	FSL 5x20	800 mA	250 V	Slow Blow	5mm x 20mm	35A	5.12	Not Specified	Active
0034.5042	SCHURTER Inc.	FTT 5x20	800 mA	250 V	Slow Blow	5mm x 20mm	35A	19.6	Not Specified	Active
0034.5616.11	SCHURTER Inc.	SMD-FST	800 mA	250 V	Slow Blow	5mm x 20mm	35A	3.85	Not Specified	Active

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and satisfy the core electrical and mechanical requirements for 800 mA, 250 V AC/DC slow-blow fuse cartridge applications in 5mm x 20mm form factor.

Eaton - Electronics Division Substitutes (BK/S506-800-R, BK1/S506-800-R, S506-800-R, BK/GMD-800-R): These parts are manufactured by the same supplier as the main part and carry expanded approval certifications including BSI, CCC, CSA, cULus, IMQ, SEMKO, and VDE. The S506 series variants (BK/S506-800-R, BK1/S506-800-R, S506-800-R) are electrically and mechanically identical to the main part with matching Melting I²t (2.78) and DC Cold Resistance (0.129 Ohms). The BK/GMD-800-R variant exhibits higher Melting I²t (6.6) and DC Cold Resistance (0.4475 Ohms), indicating different thermal response characteristics while maintaining the same current and voltage ratings.

Littelfuse Inc. Substitutes (0218.800MXP, 0218.800TXP): Both Littelfuse 218 series parts meet electrical and mechanical specifications with Melting I²t of 3.37 and lower DC Cold Resistance (0.0813 Ohms). These parts carry comprehensive approval certifications including CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE. Operating temperature range extends to -55°C ~ 125°C.

SCHURTER Inc. Substitutes (0034.3116, 0034.3774, 0034.5042, 0034.5616.11): SCHURTER parts are available across multiple series (FST 5x20, FSL 5x20, FTT 5x20, SMD-FST) with varying Melting I²t values (3.85, 5.12, 19.6, 3.85 respectively). All maintain the required electrical and mechanical parameters. Operating temperature ranges vary by series. SCHURTER parts carry certifications from CCC, cULus, cURus, and VDE.

Selection among substitute parts should be based on approval agency requirements for the target application, inventory availability, and any specific thermal response characteristics required by the circuit design.

Frequently Asked Questions (FAQ)

Q: Can BK/S506-800-R be used as a direct replacement for BK/GDC-800MA?

A: Yes. Both parts share identical electrical parameters (800 mA, 250 V AC/DC, slow-blow response), mechanical dimensions (5mm x 20mm), and breaking capacity (35A). Both require a holder for installation. Melting I²t and DC Cold Resistance values are identical (2.78 and 0.129 Ohms respectively). BK/S506-800-R carries additional approval certifications (BSI, CCC, SEMKO, VDE) beyond the main part.

Q: What is the difference between BK/GMD-800-R and BK/S506-800-R?

A: Both parts meet the same electrical and mechanical specifications for 800 mA, 250 V AC/DC protection in 5mm x 20mm form factor. The primary difference is thermal response: BK/GMD-800-R has Melting I²t of 6.6 and DC Cold Resistance of 0.4475 Ohms, while BK/S506-800-R has Melting I²t of 2.78 and DC Cold Resistance of 0.129 Ohms. This indicates BK/GMD-800-R exhibits slower thermal response. Selection depends on circuit requirements for trip time characteristics.

Q: Are Littelfuse 0218.800MXP and 0218.800TXP interchangeable?

A: Yes. Both Littelfuse 218 series parts are electrically and mechanically identical with 800 mA current rating, 250 V voltage rating, 5mm x 20mm package, and identical Melting I²t (3.37) and DC Cold Resistance (0.0813 Ohms). Both require a holder for installation. Approval certifications differ slightly (0218.800MXP includes K-MARK; 0218.800TXP includes KC), but both carry UL, CSA, VDE, and SEMKO certifications.

Q: What does Melting I²t indicate in fuse selection?

A: Melting I²t is a thermal characteristic that indicates the fuse's response to overcurrent conditions. Lower Melting I²t values indicate faster thermal response to overcurrent. Higher values indicate slower response. When substituting fuses, Melting I²t differences may affect trip time characteristics. Verify that substitute parts with different Melting I²t values are acceptable for the specific circuit application.

Q: Do all substitute parts require the same holder as BK/GDC-800MA?

A: All listed substitute parts are 5mm x 20mm cartridge fuses requiring a holder for installation. Mechanical dimensions are identical (0.205" Dia x 0.787" L). Verify that the holder is rated for the specific fuse series being used, as some manufacturers design series-specific holders. Consult the holder manufacturer's documentation for compatibility with substitute fuse series.

Q: Which substitute parts have the widest operating temperature range?

A: Littelfuse 0218.800MXP and 0218.800TXP, along with SCHURTER 0034.5616.11, operate across -55°C ~ 125°C. SCHURTER 0034.3116 operates across -55°C ~ 125°C. SCHURTER 0034.3774 and 0034.5042 operate across -40°C ~ 85°C. The main part BK/GDC-800MA does not specify an operating temperature range. Select substitute parts based on the target application's temperature requirements.

Q: Are all substitute parts RoHS Compliant?

A: Yes. All listed substitute parts carry ROHS3 Compliance status or are RoHS Compliant. The main part BK/GDC-800MA is RoHS Compliant. All parts are suitable for applications requiring RoHS compliance.

Q: What approval certifications are most common across substitute parts?

A: cULus and VDE certifications appear across multiple substitute parts. CSA and CCC certifications are present in most Eaton and Littelfuse parts. SCHURTER parts carry cULus and cURus certifications. Verify that substitute parts carry the specific approval certifications required by the target application's regulatory framework.

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