S505-500-R Ceramic Fuse Equivalent & Substitute Parts

Part Overview

The Eaton S505-500-R is a ceramic cartridge fuse rated at 500 mA, 250 V AC/DC with slow-blow response characteristics. The fuse is designed for 5mm x 20mm holder mounting and is classified as Active product status. Equivalent and substitute parts are identified when component availability is limited, supply chain disruptions occur, or design flexibility is required while maintaining electrical and mechanical compatibility within the specified parameter envelope.

Key Parameters

Parameter	Value	Unit	Criticality
Current Rating	500	mA	Critical
Voltage Rating - AC	250	V	Critical
Fuse Type	Cartridge, Ceramic	-	Critical
Package / Case	5mm x 20mm	-	Critical
Response Time	Slow Blow	-	Critical
Breaking Capacity @ Rated Voltage	1.5	kA	Critical
Mounting Type	Requires Holder	-	Critical

Substitute Part Grouping Explanation

Substitute parts for the S505-500-R are classified based on strict electrical and mechanical parameter alignment. All substitute candidates must satisfy the following mandatory criteria:

Electrical Parameters (Non-negotiable):

Current Rating: 500 mA
Voltage Rating - AC: 250 V
Breaking Capacity @ Rated Voltage: 1.5 kA
Response Time: Slow Blow

Mechanical Parameters (Non-negotiable):

Fuse Type: Cartridge, Ceramic
Package / Case: 5mm x 20mm
Mounting Type: Requires Holder

Compliance Parameters:

RoHS Status: RoHS3 Compliant or RoHS Compliant
Product Status: Active

Substitutes are grouped into two categories:

Direct Manufacturer Equivalents: Parts from the same manufacturer (Eaton) with identical electrical and mechanical specifications. These include BK/S505-500-R and BK1/S505-500-R.

Cross-Manufacturer Parametric Equivalents: Parts from alternative manufacturers (Littelfuse Inc., OptiFuse) that meet all critical electrical and mechanical parameters. These include 0215.500MXP, 0215.500TXP, 0285.500HXP, and TCD-500MA.

Parameter Comparison

Part Number	Manufacturer	Current Rating (mA)	Voltage Rating - AC (V)	Response Time	Package / Case	Breaking Capacity @ Rated Voltage (kA)	DC Cold Resistance (Ohms)	Melting I²t	RoHS Status	Product Status
S505-500-R	Eaton - Electronics Division	500	250	Slow Blow	5mm x 20mm	1.5	0.507	0.188	RoHS Compliant	Active
BK/S505-500-R	Eaton - Electronics Division	500	250	Slow Blow	5mm x 20mm	1.5	0.507	0.188	ROHS3 Compliant	Active
BK1/S505-500-R	Eaton - Electronics Division	500	250	Slow Blow	5mm x 20mm	1.5	0.507	0.188	ROHS3 Compliant	Active
0215.500MXP	Littelfuse Inc.	500	250	Slow Blow	5mm x 20mm	1.5	1.1675	0.42	ROHS3 Compliant	Active
0215.500TXP	Littelfuse Inc.	500	250	Slow Blow	5mm x 20mm	1.5	1.1675	0.42	ROHS3 Compliant	Active
0285.500HXP	Littelfuse Inc.	500	250	Slow Blow	5mm x 20mm	1.5	1.1215	0.3	ROHS3 Compliant	Active
TCD-500MA	OptiFuse	500	250	Slow Blow	5mm x 20mm	1.5	-	-	ROHS3 Compliant	Active

Engineering Selection Recommendations

Tier 1 - Direct Manufacturer Equivalents (Preferred):

BK/S505-500-R and BK1/S505-500-R are direct equivalents from Eaton - Electronics Division. Both parts maintain identical electrical characteristics (current rating, voltage rating, breaking capacity, response time) and mechanical specifications (5mm x 20mm package). Both are Active status products with ROHS3 compliance. These parts are recommended as primary substitutes when S505-500-R availability is constrained.

Tier 2 - Cross-Manufacturer Parametric Equivalents (Acceptable):

0215.500MXP, 0215.500TXP, 0285.500HXP (Littelfuse Inc.) and TCD-500MA (OptiFuse) meet all critical electrical and mechanical parameters. All are Active status products with ROHS3 compliance. These parts are functionally equivalent within the specified parameter envelope and are suitable for substitution when Tier 1 options are unavailable.

Compliance Considerations:

All substitute parts maintain Active product status and RoHS3 compliance. Littelfuse parts (0215.500MXP, 0215.500TXP, 0285.500HXP) carry CE, CSA, SEMKO, UL, and VDE certifications. OptiFuse TCD-500MA carries cURus and IEC 60127 certifications. The original S505-500-R carries BSI, CCC/CQC, CSA, cULus, IMQ, SEMKO, and VDE certifications. Certification alignment should be verified against application-specific regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can 0215.500MXP and 0215.500TXP be used interchangeably with S505-500-R?

A: Yes. Both Littelfuse parts meet all critical electrical parameters (500 mA, 250 V AC, 1.5 kA breaking capacity, slow-blow response) and mechanical specifications (5mm x 20mm ceramic cartridge). Both are Active status products with ROHS3 compliance. Differences in DC cold resistance (1.1675 Ohms vs. 0.507 Ohms) and melting I²t (0.42 vs. 0.188) are within acceptable tolerance for ceramic fuse cartridges of this class.

Q: What is the difference between BK/S505-500-R and BK1/S505-500-R?

A: Both are Eaton direct equivalents with identical electrical and mechanical specifications. The primary difference is RoHS compliance designation (ROHS3 vs. ROHS3) and approval agency certifications. BK1/S505-500-R lists cURus certification while BK/S505-500-R lists cULus certification. Both are suitable substitutes for the original S505-500-R.

Q: Are there operating temperature differences between substitute parts?

A: The original S505-500-R does not specify an operating temperature range. Littelfuse parts (0215.500MXP, 0215.500TXP, 0285.500HXP) and OptiFuse TCD-500MA specify -55°C to 125°C operating range. This extended temperature specification does not affect substitution compatibility for standard applications.

Q: Can TCD-500MA from OptiFuse be used as a direct replacement?

A: Yes. TCD-500MA meets all critical electrical parameters (500 mA, 250 V AC, 1.5 kA breaking capacity, slow-blow response) and mechanical specifications (5mm x 20mm ceramic cartridge). It is an Active status product with ROHS3 compliance and carries cURus and IEC 60127 certifications. DC cold resistance and melting I²t values are not provided for this part.

Q: What is the significance of melting I²t values in fuse selection?

A: Melting I²t is a thermal characteristic that indicates the energy required to melt the fuse element. Variations in melting I²t (0.188 to 0.42 across the substitute parts) reflect different fuse element designs while maintaining the same current rating and response time classification. All listed substitutes are rated for 500 mA slow-blow operation and are compatible within this parameter class.

Q: Are all substitute parts available in bulk packaging?

A: Yes. All substitute parts listed are available in bulk packaging. Inventory levels vary: S505-500-R (1189 pcs), BK/S505-500-R (1829 pcs), BK1/S505-500-R (1574 pcs), 0215.500MXP (16170 pcs), 0215.500TXP (1213 pcs), 0285.500HXP (1027 pcs), and TCD-500MA (2302 pcs).

Q: Do all substitute parts require the same holder as the original S505-500-R?

A: Yes. All substitute parts are 5mm x 20mm ceramic cartridge fuses that require a holder for mounting. The mechanical package specification is identical across all listed parts, ensuring compatibility with existing holder installations.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message