GDC-6.3A Equivalent & Substitute Parts

Part Overview

The GDC-6.3A is a 6.3 A, 250 V AC/DC slow blow glass cartridge fuse manufactured by Eaton - Electronics Division. This fuse is designed for use in 5mm x 20mm fuse holders and provides circuit protection in applications requiring a slow blow response characteristic. The part is currently active in production with 1134 pieces in stock. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity when the primary part becomes unavailable or when design requirements necessitate alternative manufacturers or series designations.

Key Parameters

Parameter	Value
Current Rating	6.3 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	5mm x 20mm
Breaking Capacity @ Rated Voltage	63 A
Mounting Type	Requires Holder
Size / Dimension	0.205" Dia x 0.787" L (5.20mm x 20.00mm)

Substitute Part Grouping Explanation

Substitution of the GDC-6.3A is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Criteria:

Current Rating: 6.3 A
Voltage Rating (AC): 250 V
Fuse Type: Cartridge, Glass
Response Time: Slow Blow
Package / Case: 5mm x 20mm
Breaking Capacity @ Rated Voltage: 63 A
Mounting Type: Requires Holder

All substitute parts listed meet these criteria without exception. Substitute parts are grouped by manufacturer and series designation. Parametric equivalents share identical electrical and mechanical specifications. Direct manufacturer parts from alternative suppliers (Littelfuse Inc., SCHURTER Inc.) provide functional equivalence within the same application context.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Series	Current Rating (A)	Voltage Rating (V AC)	Response Time	Package	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ohms)	Inventory (Pcs)
GDC-6.3A	Eaton - Electronics Division	GDC	6.3	250	Slow Blow	5mm x 20mm	63	237.6	0.0071	1134
BK/GDC-6.3A	Eaton - Electronics Division	GDC	6.3	250	Slow Blow	5mm x 20mm	63	237.6	0.0071	1668
BK/S506-6.3-R	Eaton - Electronics Division	S506	6.3	250	Slow Blow	5mm x 20mm	63	237.6	0.0071	1506
021306.3MXP	Littelfuse Inc.	213	6.3	250	Slow Blow	5mm x 20mm	63	600	0.0095	1719
0034.3125	SCHURTER Inc.	FST 5x20	6.3	250	Slow Blow	5mm x 20mm	63	190	Not Provided	59595
0034.5625.11	SCHURTER Inc.	SMD-FST	6.3	250	Slow Blow	5mm x 20mm	63	190	Not Provided	1692
021806.3HXP	Littelfuse Inc.	218	6.3	250	Slow Blow	5mm x 20mm	63	198.5	0.0076	1600
021806.3MXBP	Littelfuse Inc.	218	6.3	250	Slow Blow	5mm x 20mm	63	198.5	0.0076	1768
021806.3MXF34P	Littelfuse Inc.	218	6.3	250	Slow Blow	5mm x 20mm	63	198.5	0.0076	1499
021806.3MXP	Littelfuse Inc.	218	6.3	250	Slow Blow	5mm x 20mm	63	198.5	0.0076	2743
021806.3TXP	Littelfuse Inc.	218	6.3	250	Slow Blow	5mm x 20mm	63	198.5	0.0076	990

Engineering Selection Recommendations

Eaton - Electronics Division Equivalents: BK/GDC-6.3A and BK/S506-6.3-R are parametric equivalents manufactured by Eaton - Electronics Division. Both parts maintain identical electrical specifications and mechanical dimensions to the GDC-6.3A. BK/GDC-6.3A carries cULus, IMQ, and MITI/JET approvals. BK/S506-6.3-R carries expanded regulatory approvals including BSI, CCC, CSA, cURUS, IMQ, PSE/JET, SEMKO, and VDE, providing broader international compliance coverage.

Littelfuse Inc. Alternatives: The Littelfuse 218 series (021806.3HXP, 021806.3MXBP, 021806.3MXF34P, 021806.3MXP, 021806.3TXP) and 213 series (021306.3MXP) provide direct functional equivalence. All Littelfuse parts are ROHS3 compliant and REACH unaffected. Operating temperature range is specified as -55°C to 125°C. Littelfuse parts carry comprehensive regulatory approvals including CCC, CE, CSA, K-MARK, PSE, SEMKO, UL, and VDE. Melting I²t values range from 198.5 to 600, with DC cold resistance values between 0.0076 and 0.0095 Ohms.

SCHURTER Inc. Alternatives: SCHURTER FST 5x20 series (0034.3125) and SMD-FST series (0034.5625.11) provide parametric equivalence with melting I²t of 190. Both are ROHS3 compliant and REACH unaffected. Operating temperature range is -55°C to 125°C. SCHURTER parts carry approvals from CCC, cURus, PSE/JET, and VDE. SCHURTER inventory availability is notably high at 59,595 pieces for the 0034.3125 variant.

Regulatory Compliance: All substitute parts maintain active product status. Selection should be based on required regulatory approvals for the target application region and existing supply chain relationships with preferred manufacturers.

Frequently Asked Questions (FAQ)

Q: Can GDC-6.3A be directly replaced with BK/GDC-6.3A? A: Yes. BK/GDC-6.3A is a parametric equivalent manufactured by the same supplier (Eaton - Electronics Division) with identical current rating (6.3 A), voltage rating (250 V AC), response time (Slow Blow), and package dimensions (5mm x 20mm). Both require a fuse holder for installation.

Q: What is the difference between Littelfuse 213 series and 218 series fuses? A: Both series meet the 6.3 A, 250 V AC/DC, slow blow, 5mm x 20mm specification. The primary difference is melting I²t: the 213 series (021306.3MXP) has a melting I²t of 600, while the 218 series variants have a melting I²t of 198.5. Both are ROHS3 compliant and carry equivalent regulatory approvals.

Q: Are SCHURTER fuses compatible with the same fuse holder as Eaton GDC-6.3A? A: Yes. SCHURTER 0034.3125 and 0034.5625.11 share identical package dimensions (5mm x 20mm) and mounting type (requires holder) as the GDC-6.3A. Both are slow blow glass cartridge fuses rated for 6.3 A at 250 V AC.

Q: What does "Slow Blow" response time mean? A: Slow blow fuses tolerate temporary current surges without opening the circuit. They are designed to open only when sustained overcurrent conditions occur, making them suitable for applications with inrush currents or temporary load spikes.

Q: Which substitute part has the highest inventory availability? A: SCHURTER 0034.3125 has the highest inventory with 59,595 pieces in stock, followed by Littelfuse 021806.3MXP with 2,743 pieces.

Q: Can I use a substitute fuse with different melting I²t value? A: Melting I²t is a thermal characteristic that affects the fuse's response to overcurrent conditions. While all listed substitutes meet the 6.3 A, 250 V AC/DC, slow blow specification, variations in melting I²t (ranging from 190 to 600 in the substitute list) may affect circuit protection behavior. Application-specific thermal requirements should be evaluated.

Q: What regulatory approvals should I verify for my application? A: Regulatory requirements depend on the target market and application. Eaton parts carry cULus, IMQ, and MITI/JET approvals. Littelfuse parts carry CCC, CE, CSA, K-MARK, PSE, SEMKO, UL, and VDE approvals. SCHURTER parts carry CCC, cURus, PSE/JET, and VDE approvals. BK/S506-6.3-R from Eaton carries the broadest approval set including BSI, CCC, CSA, cURUS, IMQ, PSE/JET, SEMKO, and VDE.

Q: Are all substitute parts RoHS compliant? A: All Littelfuse and SCHURTER substitute parts listed are ROHS3 compliant. Eaton BK/GDC-6.3A is ROHS3 compliant. RoHS status for the original GDC-6.3A is not specified in the provided data.

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