Equivalent & Substitute Parts for S500-6.3-R

Part Overview

The Eaton S500-6.3-R is a 6.3 A, 250 V AC/DC fast-blow glass cartridge fuse with a 5mm x 20mm form factor. This fuse is designed for circuit protection in applications requiring fast response to overcurrent conditions. The component requires a compatible fuse holder for installation and is actively manufactured. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	S500-6.3-R
Manufacturer	Eaton - Electronics Division
Series	S500
Fuse Type	Cartridge, Glass
Current Rating	6.3 A
Voltage Rating (AC)	250 V
Response Time	Fast Blow
Package / Case	5mm x 20mm
Breaking Capacity @ Rated Voltage	63 A
Mounting Type	Requires Holder
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the S500-6.3-R is determined by the following critical parameters:

Primary Substitution Criteria:

Current Rating: 6.3 A (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Fast Blow (exact match required)
Mounting Type: Requires Holder (exact match required)

Secondary Compatibility Factors:

Breaking Capacity @ Rated Voltage: 63 A or higher
Melting I²t: 40.8 to 69 (acceptable range for fast-blow cartridge fuses)
DC Cold Resistance: 0.0095 to 0.01 Ohms (acceptable range)
Approval Agencies: Must include at least one common certification (BSI, CCC, CSA, VDE, or equivalent)
RoHS Status: ROHS3 Compliant (required)
Product Status: Active (required)

Parts meeting all primary criteria and at least one secondary factor are classified as parametric equivalents or direct manufacturer alternatives.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Series	Current Rating (A)	Voltage Rating (AC)	Response Time	Package / Case	Breaking Capacity @ Rated Voltage	Melting I²t	DC Cold Resistance (Ohms)	RoHS Status	Product Status
S500-6.3-R	Eaton - Electronics Division	S500	6.3	250 V	Fast Blow	5mm x 20mm	63 A	69	0.01	ROHS3 Compliant	Active
BK/GDB-6.3A	Eaton - Electronics Division	GDB	6.3	250 V	Fast Blow	5mm x 20mm	63 A	69	0.01	ROHS3 Compliant	Active
BK/S500-6.3-R	Eaton - Electronics Division	S500	6.3	250 V	Fast Blow	5mm x 20mm	63 A	69	0.01	ROHS3 Compliant	Active
BK1/S500-6.3-R	Eaton - Electronics Division	S500	6.3	250 V	Fast Blow	5mm x 20mm	63 A	69	0.01	ROHS3 Compliant	Active
GDB-6.3A	Eaton - Electronics Division	GDB	6.3	250 V	Fast Blow	5mm x 20mm	63 A	69	0.01	Not Specified	Active
021706.3MXP	Littelfuse Inc.	217	6.3	250 V	Fast Blow	5mm x 20mm	63 A	62.465	0.0095	ROHS3 Compliant	Active
0034.1524	SCHURTER Inc.	FSF 5x20	6.3	250 V	Fast Blow	5mm x 20mm	63 A	53.2	Not Specified	ROHS3 Compliant	Active
0034.3885	SCHURTER Inc.	FSK 5x20	6.3	250 V	Fast Blow	5mm x 20mm	200 A	40.8	Not Specified	ROHS3 Compliant	Active
021706.3HXP	Littelfuse Inc.	217	6.3	250 V	Fast Blow	5mm x 20mm	63 A	62.465	0.0095	ROHS3 Compliant	Active
021706.3TXP	Littelfuse Inc.	217	6.3	250 V	Fast Blow	5mm x 20mm	63 A	62.465	0.0095	ROHS3 Compliant	Active
FSC-6.3A	OptiFuse	FSC	6.3	250 V	Fast Blow	5mm x 20mm	200 A	Not Specified	59.24	ROHS3 Compliant	Active

Engineering Selection Recommendations

Eaton Parametric Equivalents (Same Manufacturer):

The parts BK/GDB-6.3A, BK/S500-6.3-R, BK1/S500-6.3-R, and GDB-6.3A are manufactured by Eaton - Electronics Division and share identical electrical specifications with the S500-6.3-R. These parts carry active product status and ROHS3 compliance. Selection among these Eaton variants is based on series designation and approval agency requirements. BK/S500-6.3-R and BK1/S500-6.3-R maintain the S500 series designation and are direct line replacements.

Littelfuse Cross-Manufacturer Alternatives:

The Littelfuse 217 series parts (021706.3MXP, 021706.3HXP, 021706.3TXP) are parametric equivalents with identical current, voltage, and package specifications. These parts feature melting I²t values of 62.465, which fall within the acceptable range for fast-blow cartridge fuses. All three Littelfuse variants carry comprehensive approval agency certifications including BSI, CCC, CE, CSA, KC, PSE, SEMKO, UR, and VDE. Operating temperature range is -55°C to 125°C.

SCHURTER Cross-Manufacturer Alternatives:

The SCHURTER 0034.1524 (FSF 5x20 series) and 0034.3885 (FSK 5x20 series) meet all primary substitution criteria. The 0034.1524 features a melting I²t of 53.2 with a 63 A breaking capacity. The 0034.3885 features a melting I²t of 40.8 with a 200 A breaking capacity. Both parts are ROHS3 compliant and active products. Operating temperature for 0034.3885 is -40°C to 85°C.

OptiFuse Alternative:

The FSC-6.3A from OptiFuse meets all primary substitution criteria with a 200 A breaking capacity. This part carries cULus and UL 248 certifications and operates across -55°C to 90°C. ROHS3 compliance is confirmed.

Selection Basis:

All listed substitute parts are active products with ROHS3 compliance. Selection should be based on:

Approval agency requirements for the target application
Operating temperature range compatibility
Breaking capacity requirements (63 A minimum; 200 A available for higher-fault-current applications)
Inventory availability and lead time
Manufacturer preference or qualification requirements

Frequently Asked Questions (FAQ)

Q: Can I substitute the S500-6.3-R with any of the listed alternatives without circuit redesign?

A: Yes. All listed substitute parts meet the primary electrical and mechanical specifications: 6.3 A current rating, 250 V AC voltage rating, fast-blow response, and 5mm x 20mm package. No circuit redesign is required. The fuse holder compatibility remains unchanged.

Q: What is the difference between the Eaton S500 and GDB series fuses?

A: Both series are manufactured by Eaton and share identical electrical parameters for the 6.3 A, 250 V rating. The primary difference is the series designation. BK/GDB-6.3A and GDB-6.3A belong to the GDB series, while S500-6.3-R, BK/S500-6.3-R, and BK1/S500-6.3-R belong to the S500 series. Selection between series is based on approval agency requirements and application specifications.

Q: Are there differences in breaking capacity among the substitutes?

A: Yes. The main S500-6.3-R and most Eaton and Littelfuse variants have a 63 A breaking capacity. The SCHURTER 0034.3885 and OptiFuse FSC-6.3A have a 200 A breaking capacity. Higher breaking capacity is suitable for applications with higher fault currents. Verify application requirements before selecting a higher breaking capacity variant.

Q: What is the significance of melting I²t values?

A: Melting I²t indicates the thermal energy required to melt the fuse element. The S500-6.3-R has a melting I²t of 69. Substitute parts range from 40.8 to 62.465. These variations reflect different fuse element designs but remain within acceptable parameters for fast-blow cartridge fuses in this current and voltage class. Application-specific thermal requirements should be verified.

Q: Do all substitute parts have the same approval certifications?

A: No. The S500-6.3-R carries BSI, CCC, CSA, cURus, IMQ, SEMKO, and VDE certifications. Littelfuse 217 series parts carry BSI, CCC, CE, CSA, KC, PSE, SEMKO, UR, and VDE certifications. SCHURTER and OptiFuse variants carry different certification subsets. Verify that the selected substitute meets the approval agency requirements for your target application.

Q: What is the operating temperature range for each substitute?

A: The S500-6.3-R does not specify an operating temperature range. Littelfuse 217 series parts operate from -55°C to 125°C. SCHURTER 0034.1524 operates from -55°C to 125°C. SCHURTER 0034.3885 operates from -40°C to 85°C. OptiFuse FSC-6.3A operates from -55°C to 90°C. Select based on your application's thermal environment.

Q: Can I use the FSC-6.3A from OptiFuse as a direct replacement?

A: Yes. The FSC-6.3A meets all primary substitution criteria: 6.3 A, 250 V, fast-blow, 5mm x 20mm package, and requires a holder. It carries cULus and UL 248 certifications. The 200 A breaking capacity provides higher fault-current protection than the original 63 A rating. Verify that your application's approval agency requirements align with OptiFuse certifications.

Q: What does ROHS3 compliance mean?

A: ROHS3 compliance indicates the part meets the Restriction of Hazardous Substances Directive 3 requirements, restricting the use of specific hazardous materials in electrical and electronic equipment. All listed substitute parts are ROHS3 compliant, ensuring environmental and regulatory compliance.

Q: Are there inventory considerations when selecting a substitute?

A: Yes. Inventory levels vary significantly among substitutes. BK/S500-6.3-R has 8,391 pieces in stock, while GDB-6.3A has 819 pieces. Littelfuse 021706.3MXP has 2,549 pieces. SCHURTER 0034.1524 has 175,658 pieces. Consider lead time and availability for your procurement timeline.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message