Equivalent & Substitute Parts for S506-6.3-R Glass Cartridge Fuse

Part Overview

The S506-6.3-R 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 holder applications and is currently in active production status. Equivalent and substitute parts are necessary to support supply chain flexibility, inventory management, and design standardization across multiple manufacturers while maintaining identical electrical and mechanical performance characteristics.

Key Parameters

Parameter	Value
Current Rating	6.3 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm
Response Time	Slow Blow
Breaking Capacity @ Rated Voltage	63 A
Mounting Type	Requires Holder
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for the S506-6.3-R is determined by strict equivalence across the following parameters:

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

All substitute parts listed below meet these criteria. Variations in melting I²t, DC cold resistance, operating temperature range, and approval agency certifications do not disqualify substitution eligibility, as these parameters represent performance enhancements or regional compliance certifications rather than functional incompatibilities.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (A)	Voltage Rating (V AC)	Fuse Type	Package / Case	Response Time	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ohms)	Operating Temperature	RoHS Status	Inventory (Pcs)
S506-6.3-R	Eaton - Electronics Division	6.3	250	Cartridge, Glass	5mm x 20mm	Slow Blow	63	237.6	0.0071	Not specified	ROHS3 Compliant	1093
BK/S506-6.3-R	Eaton - Electronics Division	6.3	250	Cartridge, Glass	5mm x 20mm	Slow Blow	63	237.6	0.0071	Not specified	ROHS3 Compliant	1506
BK/GDC-6.3A	Eaton - Electronics Division	6.3	250	Cartridge, Glass	5mm x 20mm	Slow Blow	63	237.6	0.0071	Not specified	ROHS3 Compliant	1668
GDC-6.3A	Eaton - Electronics Division	6.3	250	Cartridge, Glass	5mm x 20mm	Slow Blow	63	237.6	0.0071	Not specified	ROHS3 Compliant	1134
0034.3125	SCHURTER Inc.	6.3	250	Cartridge, Glass	5mm x 20mm	Slow Blow	63	190	Not specified	-55°C ~ 125°C	ROHS3 Compliant	59595
0034.5625.11	SCHURTER Inc.	6.3	250	Cartridge, Glass	5mm x 20mm	Slow Blow	63	190	Not specified	-55°C ~ 125°C	ROHS3 Compliant	1692
021306.3MXP	Littelfuse Inc.	6.3	250	Cartridge, Glass	5mm x 20mm	Slow Blow	63	600	0.0095	-55°C ~ 125°C	ROHS3 Compliant	1719
021806.3HXP	Littelfuse Inc.	6.3	250	Cartridge, Glass	5mm x 20mm	Slow Blow	63	198.5	0.0076	-55°C ~ 125°C	ROHS3 Compliant	1600
021806.3MXBP	Littelfuse Inc.	6.3	250	Cartridge, Glass	5mm x 20mm	Slow Blow	63	198.5	0.0076	-55°C ~ 125°C	ROHS3 Compliant	1768
021806.3MXF34P	Littelfuse Inc.	6.3	250	Cartridge, Glass	5mm x 20mm	Slow Blow	63	198.5	0.0076	-55°C ~ 125°C	ROHS3 Compliant	1499
021806.3MXP	Littelfuse Inc.	6.3	250	Cartridge, Glass	5mm x 20mm	Slow Blow	63	198.5	0.0076	-55°C ~ 125°C	ROHS3 Compliant	2743

Engineering Selection Recommendations

All listed substitute parts are in active production status and ROHS3 compliant. Selection among equivalent parts should be based on the following criteria:

Eaton Series (S506, GDC): Direct manufacturer equivalents with identical melting I²t (237.6) and DC cold resistance (0.0071 Ohms). BK/S506-6.3-R and BK/GDC-6.3A offer higher inventory availability (1506 and 1668 units respectively) compared to the main part number S506-6.3-R (1093 units). GDC-6.3A and BK/GDC-6.3A differ only in approval agency certifications; GDC-6.3A carries cURus, IMQ, and MITI/JET approvals, while BK/GDC-6.3A includes the same certifications.

SCHURTER Series (FST 5x20, SMD-FST): 0034.3125 and 0034.5625.11 provide extended operating temperature range (-55°C ~ 125°C) and lower melting I²t (190), with significantly higher inventory availability (59595 and 1692 units respectively). These parts carry CCC, cURus, PSE/JET, and VDE certifications.

Littelfuse Series (213, 218): 021306.3MXP, 021806.3HXP, 021806.3MXBP, 021806.3MXF34P, and 021806.3MXP all provide extended operating temperature range (-55°C ~ 125°C) and comprehensive approval agency coverage including CCC, CE, CSA, PSE, SEMKO, UL, and VDE. Melting I²t values range from 198.5 to 600, with DC cold resistance between 0.0076 and 0.0095 Ohms. 021806.3MXP offers the highest inventory (2743 units).

All parts meet the mandatory substitution criteria and are suitable for direct replacement in 5mm x 20mm holder applications rated for 6.3 A at 250 V AC/DC with slow-blow response characteristics.

Frequently Asked Questions (FAQ)

Q: Can I substitute S506-6.3-R with BK/S506-6.3-R?

A: Yes. BK/S506-6.3-R is a direct equivalent manufactured by Eaton - Electronics Division with identical electrical specifications, breaking capacity, melting I²t, and DC cold resistance. Both are ROHS3 compliant and require the same 5mm x 20mm holder.

Q: What is the difference between Eaton GDC series and S506 series?

A: Both series are manufactured by Eaton - Electronics Division and share identical electrical parameters (6.3 A, 250 V, 63 A breaking capacity, 237.6 melting I²t, 0.0071 Ohms DC cold resistance). The primary difference is approval agency certification. GDC series carries cURus, IMQ, and MITI/JET certifications, while S506 series carries BSI, CCC, CSA, CURUS, IMQ, PSE/JET, SEMKO, and VDE certifications.

Q: Are SCHURTER 0034.3125 and Littelfuse 021806.3MXP interchangeable with S506-6.3-R?

A: Yes, both are parametric equivalents. All three parts meet the mandatory substitution criteria: 6.3 A current rating, 250 V AC voltage rating, slow-blow response, 63 A breaking capacity, 5mm x 20mm package, and cartridge glass fuse type. Differences in melting I²t (190 for SCHURTER, 198.5 for Littelfuse 218 series, 237.6 for Eaton) and operating temperature range do not affect substitution eligibility.

Q: What does "Requires Holder" mean for mounting type?

A: All listed parts are cartridge fuses that must be installed in a compatible 5mm x 20mm fuse holder. They are not surface-mount or panel-mount components and cannot be used without an appropriate holder assembly.

Q: Why do some parts have higher melting I²t values?

A: Melting I²t is a thermal characteristic that affects the fuse's response curve. Higher values indicate slower thermal response. All listed parts maintain the slow-blow classification and 6.3 A current rating, making them functionally equivalent for circuit protection purposes. Variations in melting I²t do not disqualify substitution.

Q: Which substitute part has the best inventory availability?

A: SCHURTER 0034.3125 has the highest inventory with 59595 units in stock, followed by Littelfuse 021806.3MXP with 2743 units. Eaton BK/GDC-6.3A offers 1668 units.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all listed substitute parts are ROHS3 compliant, matching the compliance status of the main part S506-6.3-R.

Q: Can I use 021806.3MXP in applications requiring BSI certification?

A: 021806.3MXP carries CCC, CE, CSA, K-MARK, PSE, SEMKO, UL, and VDE certifications. It does not carry BSI certification. If BSI certification is a mandatory requirement, use S506-6.3-R, BK/S506-6.3-R, BK/GDC-6.3A, or GDC-6.3A, which all include BSI approval.

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