Equivalent & Substitute Parts for S506-100-R

Part Overview

The S506-100-R is a 100 mA, 250 V AC/DC glass cartridge fuse manufactured by Eaton - Electronics Division. This slow-blow fuse is designed for 5mm x 20mm holder applications and requires an external fuse holder for installation. The part is active in production with 729 units currently in stock. Alternative equivalent parts are necessary to support supply chain flexibility, accommodate regional availability constraints, and provide options across multiple manufacturer certifications and approval agencies.

Key Parameters

Parameter	Value
Current Rating	100 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)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the S506-100-R is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Current Rating: 100 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 minimum
Size / Dimension: 0.205" Dia x 0.787" L (5.20mm x 20.00mm)

All substitute parts listed meet these mandatory parameters. Variations in secondary parameters such as melting I²t, DC cold resistance, approval agencies, and operating temperature ranges do not disqualify substitution eligibility when the core electrical and mechanical specifications align.

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage (AC)	Response Time	Package	Breaking Capacity	Melting I²t	DC Cold Resistance (Ohms)	RoHS Status	Inventory (Pcs)
S506-100-R	Eaton	100 mA	250 V	Slow Blow	5x20mm	35A	0.045	2.8	ROHS3	729
BK/S506-100-R	Eaton	100 mA	250 V	Slow Blow	5x20mm	35A	0.045	2.8	ROHS3	710
BK/GDC-100MA	Eaton	100 mA	250 V	Slow Blow	5x20mm	35A	0.045	2.8	ROHS3	1929
BK1/S506-100-R	Eaton	100 mA	250 V	Slow Blow	5x20mm	35A	0.045	2.8	ROHS3	1501
GDC-100MA	Eaton	100 mA	250 V	Slow Blow	5x20mm	35A	0.045	2.8	ROHS3	921
0034.3107	SCHURTER Inc.	100 mA	250 V	Slow Blow	5x20mm	35A	0.107	Not Specified	ROHS3	4715
0034.5607.11	SCHURTER Inc.	100 mA	250 V	Slow Blow	5x20mm	35A	0.107	Not Specified	ROHS3	1030
0218.100HXP	Littelfuse Inc.	100 mA	250 V	Slow Blow	5x20mm	35A	0.0482	8.905	ROHS3	787
0218.100MXP	Littelfuse Inc.	100 mA	250 V	Slow Blow	5x20mm	35A	0.0482	8.905	ROHS3	10490
0218.100TXP	Littelfuse Inc.	100 mA	250 V	Slow Blow	5x20mm	35A	0.079	6.018	ROHS3	1133
0219.100MXAP	Littelfuse Inc.	100 mA	250 V	Slow Blow	5x20mm	150A	0.079	6.018	ROHS3	3061

Engineering Selection Recommendations

Eaton Series (S506 and GDC): Parts BK/S506-100-R, BK/GDC-100MA, BK1/S506-100-R, and GDC-100MA are direct Eaton equivalents with identical electrical characteristics and DC cold resistance values. These parts carry approval from BSI, CCC, CSA, IMQ, SEMKO, UR, and VDE. Selection from this group is appropriate when maintaining consistency with existing Eaton component specifications or when specific Eaton certifications are required.

SCHURTER Series (FST 5x20 and SMD-FST): Parts 0034.3107 and 0034.5607.11 are SCHURTER equivalents with identical current, voltage, and breaking capacity ratings. These parts operate across -55°C to 125°C and carry CCC, cURus, and VDE approvals. The melting I²t value of 0.107 differs from the Eaton baseline, but this does not affect substitution eligibility. Selection from this group is appropriate when SCHURTER certifications are required or when extended operating temperature range is beneficial.

Littelfuse Series (218 and 219XA): Parts 0218.100HXP, 0218.100MXP, 0218.100TXP, and 0219.100MXAP are Littelfuse equivalents meeting all mandatory electrical and mechanical parameters. These parts operate across -55°C to 125°C and carry CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE approvals. The 0219.100MXAP variant features a breaking capacity of 150A, exceeding the 35A baseline. Littelfuse parts are appropriate when UL or CE certifications are required or when higher breaking capacity is beneficial.

All substitute parts are ROHS3 compliant and active in production. Selection should be based on required approval agencies, regional compliance needs, and inventory availability.

Frequently Asked Questions (FAQ)

Q: Can I substitute the S506-100-R with any of the listed equivalent parts?

A: Yes. All listed parts meet the mandatory electrical and mechanical specifications: 100 mA current rating, 250 V AC voltage rating, slow-blow response, 5mm x 20mm package, 35A minimum breaking capacity, and cartridge glass fuse type. Physical dimensions and holder compatibility are identical across all parts.

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

A: Both series are manufactured by Eaton and meet identical electrical specifications for the 100 mA, 250 V application. The GDC series carries cULus and IMQ approvals, while the S506 series carries BSI, CCC, CSA, IMQ, SEMKO, UR, and VDE approvals. Selection between series depends on required certifications.

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

A: Melting I²t represents the thermal energy required to melt the fuse element and is a secondary characteristic that does not affect substitution eligibility when all primary electrical and mechanical parameters match. Variations in melting I²t among equivalent parts reflect different fuse element designs while maintaining identical current and voltage ratings.

Q: Are the Littelfuse 0218 series parts interchangeable with Eaton parts?

A: Yes. The 0218.100HXP, 0218.100MXP, and 0218.100TXP parts meet all mandatory specifications and are mechanically and electrically compatible. These parts carry UL and CE certifications in addition to other approvals. The 0219.100MXAP variant offers enhanced breaking capacity (150A versus 35A) and is also fully compatible.

Q: What is the significance of the BK and BK1 prefixes on Eaton part numbers?

A: The BK and BK1 prefixes indicate packaging or distribution variants of the base S506-100-R part. All variants maintain identical electrical and mechanical specifications and are fully interchangeable.

Q: Do all substitute parts require the same holder?

A: Yes. All parts are 5mm x 20mm cartridge fuses and require a standard 5mm x 20mm fuse holder. Physical dimensions are identical across all listed parts.

Q: Which substitute part has the highest inventory availability?

A: The Littelfuse 0218.100MXP has the highest inventory with 10,490 units in stock, followed by SCHURTER 0034.3107 with 4,715 units.

Q: Can I use the 0219.100MXAP as a direct replacement for the S506-100-R?

A: Yes. The 0219.100MXAP meets all mandatory electrical and mechanical specifications and is fully compatible. The higher breaking capacity (150A versus 35A) provides additional safety margin and does not prevent substitution.

Q: What approval agencies are common across all substitute parts?

A: All parts are ROHS3 compliant. CCC approval is present on most parts. Specific approval agency combinations vary by manufacturer and part number. Verify required certifications for your application before selection.

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