Equivalent & Substitute Parts for S505-1-R

Part Overview

The Eaton S505-1-R is a 1 A, 250 V AC ceramic cartridge fuse with a 5mm x 20mm form factor and slow-blow response characteristics. This fuse is designed for applications requiring overcurrent protection in AC and DC circuits and requires a compatible fuse holder for installation. The part maintains active product status with 844 units in current inventory. Equivalent and substitute parts are identified to provide design flexibility, support supply chain continuity, and accommodate specific application requirements such as extended operating temperature ranges or alternative approval certifications.

Key Parameters

Parameter	Value
Current Rating	1 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Ceramic
Package / Case	5mm x 20mm
Response Time	Slow Blow
Breaking Capacity @ Rated Voltage	1.5 kA
Mounting Type	Requires Holder
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Current Rating: 1 A (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Fuse Type: Cartridge, Ceramic (exact match required)
Response Time: Slow Blow (exact match required)
Breaking Capacity @ Rated Voltage: 1.5 kA (exact match required)
Mounting Type: Requires Holder (exact match required)

Secondary Compatibility Factors:

Approval Agency certifications (must include relevant regional standards)
RoHS compliance status
Operating temperature range (extended ranges provide additional application flexibility)
DC Cold Resistance (minor variations acceptable within engineering tolerance)
Melting I²t characteristics (variations noted but do not preclude substitution when primary criteria are met)

Substitute parts are grouped into three categories: Direct Manufacturer equivalents from Eaton, Parametric Equivalents from alternative manufacturers meeting all primary criteria, and Similar parts with identical electrical specifications but minor variations in secondary characteristics.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current (A)	Voltage AC (V)	Package	Response Time	Breaking Capacity (kA)	Melting I²t	DC Resistance (Ω)	Operating Temp (°C)	RoHS Status
S505-1-R	Eaton	1	250	5x20mm	Slow Blow	1.5	1.28	0.1401	—	RoHS Compliant
BK/S505-1-R	Eaton	1	250	5x20mm	Slow Blow	1.5	1.28	0.1401	—	ROHS3 Compliant
BK1/S505-1-R	Eaton	1	250	5x20mm	Slow Blow	1.5	1.28	0.1401	—	RoHS Compliant
0215001.MXP	Littelfuse Inc.	1	250	5x20mm	Slow Blow	1.5	1.52	0.1515	-55 to 125	ROHS3 Compliant
0215001.HXP	Littelfuse Inc.	1	250	5x20mm	Slow Blow	1.5	1.52	0.1515	-55 to 125	ROHS3 Compliant
0215001.VXP	Littelfuse Inc.	1	250	5x20mm	Slow Blow	1.5	1.52	0.1515	-55 to 125	ROHS3 Compliant
0001.2504	SCHURTER Inc.	1	250	5x20mm	Slow Blow	1.5	1.1	—	-55 to 125	ROHS3 Compliant
0001.2704.11	SCHURTER Inc.	1	250	5x20mm	Slow Blow	1.5	1.1	—	-55 to 125	ROHS3 Compliant
0215001.TXP	Littelfuse Inc.	1	250	5x20mm	Slow Blow	1.5	1.52	0.1515	-55 to 125	ROHS3 Compliant
0285001.HXP	Littelfuse Inc.	1	250	5x20mm	Slow Blow	1.5	1.6	0.1455	-55 to 125	ROHS3 Compliant
0659C1000-12	Bel Fuse Inc.	1	250	5x20mm	Slow Blow	1.5	2.4	0.134	-55 to 125	ROHS3 Compliant

Engineering Selection Recommendations

Direct Manufacturer Equivalents (Eaton S505 Series):

BK/S505-1-R and BK1/S505-1-R are direct equivalents manufactured by Eaton and maintain identical electrical and mechanical specifications to the S505-1-R. Both parts carry active product status and ROHS3 compliance. These parts are recommended for applications where maintaining a single manufacturer source is preferred or where existing design documentation specifies the S505 series. BK/S505-1-R offers higher inventory availability (1,279 units) compared to the main part.

Littelfuse 215 Series (0215001.MXP, 0215001.HXP, 0215001.VXP, 0215001.TXP):

These Littelfuse parts meet all primary substitution criteria and provide extended operating temperature range (-55°C to 125°C) compared to the Eaton S505-1-R. All four variants carry ROHS3 compliance and comprehensive approval certifications including CCC, CE, CSA, KC, PSE, SEMKO, UL, and VDE. The 0215001.MXP variant offers the highest inventory availability (99,138 units) among all substitute options. These parts are suitable for applications requiring broader temperature performance or where Littelfuse certification is specified.

SCHURTER SPT Series (0001.2504, 0001.2704.11):

Both SCHURTER parts satisfy all primary electrical and mechanical criteria and provide extended operating temperature range (-55°C to 125°C). These parts carry ROHS3 compliance and are approved by CCC, cURus, and VDE. The 0001.2504 variant provides additional DC voltage rating (300 V DC) beyond the AC specification. These parts are appropriate for applications requiring SCHURTER certification or where dual AC/DC voltage ratings provide design advantages.

Bel Fuse 0659C Series (0659C1000-12):

This part meets all primary substitution criteria with extended operating temperature range (-55°C to 125°C) and ROHS3 compliance. Approvals include CCC, cURus, PSE, and VDE. The 0659C1000-12 exhibits the highest melting I²t value (2.4) among all substitutes, which may be relevant for applications with specific thermal response requirements. Inventory availability is substantial (3,544 units).

Littelfuse 285 Series (0285001.HXP):

This part meets all primary criteria with extended operating temperature range (-55°C to 125°C) and ROHS3 compliance. PSE approval is provided. The melting I²t value (1.6) and DC cold resistance (0.1455 Ω) differ slightly from the main part but remain within acceptable engineering tolerance for ceramic fuse cartridges.

Frequently Asked Questions (FAQ)

Q: Can I substitute BK/S505-1-R or BK1/S505-1-R for the S505-1-R in my application?

A: Yes. Both BK/S505-1-R and BK1/S505-1-R are direct Eaton equivalents with identical current rating (1 A), voltage rating (250 V AC), package dimensions (5mm x 20mm), response time (slow blow), and breaking capacity (1.5 kA). All three parts require a compatible fuse holder and carry RoHS compliance. These substitutions are electrically and mechanically interchangeable.

Q: What is the primary difference between Eaton S505 series fuses and Littelfuse 215 series fuses?

A: The primary difference is operating temperature range. Eaton S505 fuses do not specify an operating temperature range, while Littelfuse 215 series fuses are rated for -55°C to 125°C operation. All other electrical and mechanical parameters are identical. If your application requires operation at temperatures below 0°C or above 70°C, the Littelfuse 215 series provides documented temperature performance.

Q: Are there any differences in approval certifications between the S505-1-R and its substitutes?

A: Yes. The S505-1-R carries approvals from BSI, CCC/CQC, CSA, cULus, IMQ, KC, PSE/JET, SEMKO, and VDE. Littelfuse 215 series parts carry CCC, CE, CSA, KC, PSE, SEMKO, UL, and VDE approvals. SCHURTER parts carry CCC, cURus, and VDE approvals. Bel Fuse 0659C series carries CCC, cURus, PSE, and VDE approvals. Verify that the substitute part's certification portfolio meets your regional and application-specific requirements before selection.

Q: Can I use a SCHURTER fuse with 300 V DC rating in place of the S505-1-R?

A: Yes, from an electrical and mechanical standpoint. The SCHURTER 0001.2504 meets all primary substitution criteria for 1 A, 250 V AC operation and provides additional 300 V DC rating capability. However, verify that your application design and fuse holder are compatible with SCHURTER fuse dimensions and that SCHURTER certifications satisfy your regulatory requirements.

Q: What does "melting I²t" mean and why do substitute fuses have different values?

A: Melting I²t is a thermal characteristic that describes the fuse element's energy absorption capacity before melting. Different manufacturers use different fuse element materials and designs, resulting in variations in melting I²t values. For the S505-1-R (1.28), substitutes range from 1.1 to 2.4. These variations do not affect substitutability for the specified 1 A current rating but may influence performance in transient overcurrent conditions. Consult application-specific requirements if transient response is critical.

Q: Which substitute part has the highest inventory availability?

A: The Littelfuse 0215001.MXP has the highest inventory availability with 99,138 units in stock. This part meets all primary substitution criteria and carries comprehensive certifications. If supply continuity is a primary concern, this part provides the strongest inventory position.

Q: Do all substitute fuses require the same holder as the S505-1-R?

A: All substitute parts specified in this reference maintain the identical 5mm x 20mm package dimensions and cartridge ceramic fuse type, which means they are mechanically compatible with fuse holders designed for 5mm x 20mm cartridge fuses. However, verify that your specific fuse holder model is rated for the substitute manufacturer's fuse design and that any holder-specific contact materials or spring tensions are compatible.

Q: Is RoHS compliance consistent across all parts?

A: The S505-1-R carries RoHS Compliant status. All substitute parts carry ROHS3 Compliant status, which represents a more recent RoHS standard revision. ROHS3 compliance is backward compatible with RoHS requirements, so substitution does not create compliance issues.

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