Equivalent & Substitute Parts for S505-4-R

Part Overview

The Eaton S505-4-R is a ceramic cartridge fuse rated at 4 A, 250 V AC, 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 is active in production and widely stocked. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity when the primary part number becomes unavailable or when alternative manufacturers' products meet identical electrical and mechanical specifications.

Substiute Parts

S505-4-R

Eaton - Electronics DivisionIn Stock: 5276S505-4-R Datasheet

Current PartRFQ

BK/S505-4-R

Eaton - Electronics DivisionIn Stock: 1818BK/S505-4-R Datasheet

DirectRFQ

BK1/S505-4-R

Eaton - Electronics DivisionIn Stock: 1673BK1/S505-4-R Datasheet

Parametric EquivalentRFQ

0215004.MXP

Littelfuse Inc.In Stock: 170030215004.MXP Datasheet

DirectRFQ

0001.2510

SCHURTER Inc.In Stock: 165340001.2510 Datasheet

Parametric EquivalentRFQ

0001.2710.11

SCHURTER Inc.In Stock: 16220001.2710.11 Datasheet

Parametric EquivalentRFQ

0215004.HXP

Littelfuse Inc.In Stock: 229400215004.HXP Datasheet

Parametric EquivalentRFQ

0215004.TXP

Littelfuse Inc.In Stock: 8590215004.TXP Datasheet

Parametric EquivalentRFQ

0215004.VXP

Littelfuse Inc.In Stock: 7810215004.VXP Datasheet

Parametric EquivalentRFQ

0659C4000-12

Bel Fuse Inc.In Stock: 216810659C4000-12 Datasheet

Parametric EquivalentRFQ

TCC-4A

OptiFuseIn Stock: 1243TCC-4A Datasheet

Parametric EquivalentRFQ

TCD-4A

OptiFuseIn Stock: 1747TCD-4A Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the S505-4-R ceramic cartridge fuse is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

• Current Rating: 4 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)
• Mounting Type: Requires Holder (exact match required)

Secondary Compatibility Parameters:

• Breaking Capacity @ Rated Voltage: 1.5 kA or greater
• Melting I²t: Within acceptable range for circuit protection coordination
• DC Cold Resistance: Consistent with ceramic cartridge fuse technology
• Approval Agencies: Compliance with relevant international standards (BSI, CSA, cULus, VDE, etc.)
• RoHS Status: ROHS3 Compliant

All substitute parts listed below meet or exceed these criteria and are functionally interchangeable with the S505-4-R in applications requiring 4 A, 250 V AC ceramic cartridge fuse protection in a 5mm x 20mm form factor.

Parameter Comparison

Engineering Selection Recommendations

Direct Manufacturer Equivalents (Eaton - Electronics Division):

The part numbers BK/S505-4-R and BK1/S505-4-R are direct equivalents manufactured by Eaton and share identical electrical specifications with the S505-4-R. These parts are suitable for direct substitution without any circuit design modifications. All three Eaton variants carry the same approval agencies (BSI, CCC/CQC, CSA, cULus, IMQ, KC, PSE/JET, SEMKO, VDE) and maintain ROHS3 compliance.

Littelfuse Series 215 Alternatives (0215004.MXP, 0215004.HXP, 0215004.TXP, 0215004.VXP):

The Littelfuse 215 series ceramic cartridge fuses meet all primary substitution criteria with identical current, voltage, and package specifications. These parts feature an extended operating temperature range (-55°C ~ 125°C) compared to the S505-4-R and carry comprehensive international approvals (CCC, CE, CSA, KC, PSE, SEMKO, UL, VDE). The melting I²t value of 46.96 is higher than the S505-4-R (38.45), indicating a slightly slower thermal response. These parts are suitable for applications where the extended temperature range provides operational advantage.

SCHURTER SPT Series Alternatives (0001.2510, 0001.2710.11):

The SCHURTER SPT 5x20 series fuses provide dual voltage capability with 250 V AC and 150 V DC ratings, compared to the S505-4-R which is rated for AC/DC without specified DC voltage. These parts carry approvals from CCC, cURus, KC, PSE/JET, VDE and feature an extended operating temperature range (-55°C ~ 125°C). The melting I²t of 62.4 indicates a slower thermal response profile. These parts are suitable for applications requiring DC voltage protection capability.

Bel Fuse 0659C Series Alternative (0659C4000-12):

The Bel Fuse 0659C4000-12 meets all primary substitution criteria with identical current, voltage, and package specifications. This part features an extended operating temperature range (-55°C ~ 125°C) and carries approvals from CCC, cURus, PSE, VDE. The melting I²t of 51.2 and DC cold resistance of 0.016 Ohms are within acceptable ranges for ceramic cartridge fuse technology.

OptiFuse TCC Series Alternative (TCC-4A):

The OptiFuse TCC-4A meets primary substitution criteria for current, voltage, and package specifications. This part features an extended operating temperature range (-55°C ~ 125°C) and carries cULus and UL 248 approvals. The breaking capacity of 0.2 kA is significantly lower than the S505-4-R (1.5 kA), and the melting I²t of 24.023 indicates a faster thermal response. This part is suitable only for applications where the lower breaking capacity and faster response time are compatible with circuit protection requirements.

Frequently Asked Questions (FAQ)

Q: Can I substitute the S505-4-R with any of the listed alternatives without circuit modifications?

A: All listed alternatives meet the primary substitution criteria of 4 A current rating, 250 V AC voltage rating, 5mm x 20mm package, ceramic cartridge type, and slow-blow response. Direct substitution is mechanically and electrically compatible. However, differences in melting I²t values and breaking capacity may affect circuit protection coordination. The OptiFuse TCC-4A has a significantly lower breaking capacity (0.2 kA vs. 1.5 kA) and should be evaluated for compatibility with your specific circuit protection requirements.

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

A: The melting I²t value determines the thermal energy required to melt the fuse element. Higher I²t values indicate slower thermal response. The S505-4-R has a melting I²t of 38.45, while alternatives range from 24.023 (OptiFuse TCC-4A) to 62.4 (SCHURTER SPT series). Selection should be based on circuit protection coordination requirements and the thermal characteristics of the protected circuit.

Q: Are the Eaton BK/S505-4-R and BK1/S505-4-R identical to the S505-4-R?

A: Yes. The BK/S505-4-R and BK1/S505-4-R are direct equivalents with identical electrical specifications, breaking capacity, melting I²t, DC cold resistance, and approval agencies. These parts are functionally interchangeable with the S505-4-R.

Q: What is the difference between the Littelfuse 215 series variants (0215004.MXP, 0215004.HXP, 0215004.TXP, 0215004.VXP)?

A: All four Littelfuse 215 series variants share identical electrical specifications, current rating, voltage rating, package, breaking capacity, and melting I²t. The designations (MXP, HXP, TXP, VXP) represent different packaging or distribution configurations. All are suitable for direct substitution with the S505-4-R.

Q: Do the SCHURTER alternatives offer any advantage over the S505-4-R?

A: The SCHURTER SPT series (0001.2510 and 0001.2710.11) provide dual voltage capability with 150 V DC rating in addition to 250 V AC. This is beneficial for applications requiring DC circuit protection. Both parts feature an extended operating temperature range (-55°C ~ 125°C) and higher melting I²t (62.4), indicating slower thermal response suitable for circuits with higher inrush currents.

Q: Can I use the OptiFuse TCC-4A as a direct replacement for the S505-4-R?

A: The OptiFuse TCC-4A meets the primary substitution criteria for current, voltage, and package. However, the breaking capacity is significantly lower (0.2 kA vs. 1.5 kA) and the melting I²t is lower (24.023 vs. 38.45), indicating faster thermal response. This part is suitable only if your circuit protection requirements are compatible with these characteristics. Consult circuit protection coordination requirements before substitution.

Q: Are all listed alternatives RoHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant, matching the compliance status of the S505-4-R.

Q: What approval agencies are common across all alternatives?

A: All alternatives carry CCC and VDE approvals. Additional approvals vary by manufacturer. The S505-4-R and Eaton variants carry the most comprehensive approval set including BSI, CSA, cULus, IMQ, KC, PSE/JET, and SEMKO.

Q: Can I mix different substitute parts in the same circuit or equipment?

A: All listed alternatives are electrically and mechanically compatible for use in the same 5mm x 20mm fuse holder. However, mixing fuses with different melting I²t values in the same circuit may affect protection coordination. Consistent use of a single part number is recommended for optimal circuit protection performance.