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Equivalent & Substitute Parts for S505-8-R Ceramic Fuse
Part Overview
The S505-8-R is an 8 A, 250 V AC ceramic cartridge fuse manufactured by Eaton - Electronics Division. This slow-blow fuse is designed for applications requiring circuit protection in 5mm x 20mm form factor and requires a compatible fuse holder for installation. The part is active in production with 1140 pieces currently in stock. Alternative equivalent parts are necessary to support supply chain flexibility, regional availability, and design variations across different manufacturers while maintaining identical electrical and mechanical performance.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Current Rating | 8 A |
| Voltage Rating (AC) | 250 V |
| Fuse Type | Cartridge, Ceramic |
| Response Time | Slow Blow |
| Package / Case | 5mm x 20mm |
| Breaking Capacity @ Rated Voltage | 1.5kA |
| Mounting Type | Requires Holder |
| Size / Dimension | 0.205" Dia x 0.787" L (5.20mm x 20.00mm) |
| RoHS Status | RoHS Compliant |
Substitute Part Grouping Explanation
Substitute parts for the S505-8-R are classified based on strict electrical and mechanical parameter matching:
Direct Manufacturer Equivalents (Eaton - Electronics Division): Parts BK/S505-8-R and BK1/S505-8-R are direct equivalents from the same manufacturer, differing only in RoHS compliance designation and approval agency certifications. These parts maintain identical electrical specifications: 8 A current rating, 250 V AC voltage rating, 1.5kA breaking capacity, slow-blow response, and 5mm x 20mm package dimensions.
Parametric Equivalents (Cross-Manufacturer): Parts 0215008.MXP, 0215008.HXP, 0215008.TXP (Littelfuse Inc.), 0001.2713.11 and 0001.2513 (SCHURTER Inc.), TCC-8A and TCD-8A (OptiFuse) are classified as parametric equivalents. These parts match all critical electrical parameters: 8 A current rating, 250 V AC voltage rating, slow-blow response time, 5mm x 20mm package dimensions, and 1.5kA breaking capacity. Substitution is valid when these parameters align with application requirements.
Similar Part (Non-Standard Package): Part 0835008.MXP (Littelfuse) shares electrical specifications but uses a non-standard cartridge package format. This part is not a direct substitute due to package incompatibility with standard 5mm x 20mm fuse holders.
Key Parameters Determining Substitution: Current Rating (8 A), Voltage Rating AC (250 V), Fuse Type (Cartridge, Ceramic), Response Time (Slow Blow), Package/Case (5mm x 20mm), Breaking Capacity (1.5kA).
Parameter Comparison
| Part Number | Manufacturer | Current Rating (A) | Voltage AC (V) | Response Time | Package | Breaking Capacity (kA) | Melting I²t | DC Cold Resistance (Ω) | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|
| S505-8-R | Eaton | 8 | 250 | Slow Blow | 5x20mm | 1.5 | 228 | 0.0077 | RoHS Compliant |
| BK/S505-8-R | Eaton | 8 | 250 | Slow Blow | 5x20mm | 1.5 | 228 | 0.0077 | ROHS3 Compliant |
| BK1/S505-8-R | Eaton | 8 | 250 | Slow Blow | 5x20mm | 1.5 | 228 | 0.0077 | ROHS3 Compliant |
| 0215008.MXP | Littelfuse | 8 | 250 | Slow Blow | 5x20mm | 1.5 | 209.88 | 0.0092 | ROHS3 Compliant |
| 0215008.HXP | Littelfuse | 8 | 250 | Slow Blow | 5x20mm | 1.5 | 209.88 | 0.0092 | ROHS3 Compliant |
| 0215008.TXP | Littelfuse | 8 | 250 | Slow Blow | 5x20mm | 1.5 | 209.88 | 0.0092 | ROHS3 Compliant |
| 0001.2713.11 | SCHURTER | 8 | 250 | Slow Blow | 5x20mm | 1.5 DC | 268 | — | ROHS3 Compliant |
| 0001.2513 | SCHURTER | 8 | 250 | Slow Blow | 5x20mm | 1.5 DC | 268 | — | ROHS3 Compliant |
| TCC-8A | OptiFuse | 8 | 250 | Slow Blow | 5x20mm | 0.2 | 75.422 | 0.0104 | ROHS3 Compliant |
| TCD-8A | OptiFuse | 8 | 250 | Slow Blow | 5x20mm | 1.5 | — | — | ROHS3 Compliant |
| 0835008.MXP | Littelfuse | 8 | 250 | Slow Blow | Non-Standard | 1.5 | 230 | 0.0092 | ROHS3 Compliant |
Engineering Selection Recommendations
Tier 1 - Direct Manufacturer Equivalents: BK/S505-8-R and BK1/S505-8-R are the primary substitutes. Both are manufactured by Eaton - Electronics Division and maintain identical electrical and mechanical specifications to the S505-8-R. These parts carry the same approval agencies (BSI, CQC, CSA, cULus, IMQ, KC, PSE/JET, SEMKO, VDE) and are suitable for direct replacement without design modification. BK1/S505-8-R has the highest inventory availability (1449 pieces).
Tier 2 - Cross-Manufacturer Parametric Equivalents: 0215008.MXP, 0215008.HXP, and 0215008.TXP (Littelfuse Inc., Series 215) are parametric equivalents with identical current, voltage, response time, and package specifications. These parts carry UL, CSA, and VDE certifications. Littelfuse 0215008.MXP has the highest inventory (35100 pieces), providing supply chain redundancy. DC cold resistance is slightly higher (0.0092 Ω vs. 0.0077 Ω), and melting I²t is lower (209.88 vs. 228), which remains within acceptable tolerance for slow-blow ceramic fuse applications.
Tier 3 - Extended Voltage Rating Equivalents: 0001.2713.11 and 0001.2513 (SCHURTER Inc.) are parametric equivalents with extended DC voltage rating (150 V DC in addition to 250 V AC). These parts are suitable for applications requiring dual AC/DC voltage protection. Breaking capacity is specified as 1kA AC and 1.5kA DC. Melting I²t is higher (268), indicating slightly slower response characteristics.
Tier 4 - Alternative Manufacturer Options: TCC-8A (OptiFuse, Series TCC) and TCD-8A (OptiFuse, Series TCD) are parametric equivalents. TCC-8A has a significantly lower breaking capacity (0.2kA vs. 1.5kA) and lower melting I²t (75.422), indicating faster response characteristics unsuitable for slow-blow applications requiring 1.5kA breaking capacity. TCD-8A maintains 1.5kA breaking capacity and is suitable for direct substitution.
Not Recommended: 0835008.MXP (Littelfuse, Series 835) uses a non-standard cartridge package format and is incompatible with standard 5mm x 20mm fuse holders.
Frequently Asked Questions (FAQ)
Q: Can I substitute S505-8-R with BK/S505-8-R or BK1/S505-8-R? A: Yes. Both parts are manufactured by Eaton - Electronics Division and are direct equivalents with identical electrical specifications (8 A, 250 V AC, slow-blow, 1.5kA breaking capacity, 5mm x 20mm package). The only differences are RoHS compliance designation and approval agency certifications, which do not affect electrical performance.
Q: What is the difference between Littelfuse 0215008.MXP, 0215008.HXP, and 0215008.TXP? A: All three parts are from Littelfuse Series 215 and share identical electrical specifications: 8 A, 250 V AC, slow-blow response, 1.5kA breaking capacity, and 5mm x 20mm package. The suffix designations (MXP, HXP, TXP) indicate different packaging or lead configurations. All three are parametric equivalents suitable for substitution.
Q: Can I use SCHURTER 0001.2713.11 or 0001.2513 as substitutes? A: Yes, with consideration for extended DC voltage rating. Both parts maintain the required 8 A, 250 V AC, slow-blow, 1.5kA breaking capacity, and 5mm x 20mm package. These parts additionally support 150 V DC operation, making them suitable for dual AC/DC applications. Melting I²t is higher (268 vs. 228), indicating slightly slower response.
Q: Why is 0835008.MXP not recommended? A: Part 0835008.MXP uses a non-standard cartridge package format and is physically incompatible with standard 5mm x 20mm fuse holders. Although electrical specifications match, mechanical incompatibility prevents installation.
Q: What is the significance of melting I²t values in the comparison table? A: Melting I²t indicates the thermal energy required to melt the fuse element. Lower values indicate faster response to overcurrent. S505-8-R has melting I²t of 228. Littelfuse equivalents (209.88) respond slightly faster, while SCHURTER parts (268) respond slightly slower. All values remain within acceptable range for slow-blow ceramic fuse applications.
Q: Can I substitute S505-8-R with OptiFuse TCC-8A? A: TCC-8A is not recommended as a direct substitute. Although it matches current, voltage, response time, and package specifications, its breaking capacity is only 0.2kA compared to the required 1.5kA, and melting I²t is significantly lower (75.422 vs. 228). This indicates substantially faster response characteristics unsuitable for slow-blow applications. OptiFuse TCD-8A is the appropriate OptiFuse equivalent.
Q: Are all substitute parts RoHS compliant? A: Yes. All listed substitute parts carry ROHS3 Compliant or RoHS Compliant status. The original S505-8-R is RoHS Compliant, and all direct and parametric equivalents maintain this compliance level.
Q: What approval agencies are common across all substitute parts? A: VDE and CSA certifications are present across most substitute parts. Littelfuse parts carry UL certification. SCHURTER parts carry cURus and VDE. OptiFuse parts carry cURus or UL 248 / IEC 60127. Verify specific application requirements against required approval agencies before final selection.
Q: Can I mix different substitute parts in the same circuit or equipment? A: All listed substitute parts are parametric equivalents with identical electrical specifications for the critical parameters (8 A, 250 V AC, slow-blow, 1.5kA breaking capacity, 5mm x 20mm package). However, design documentation and equipment certification should be reviewed to confirm whether mixed manufacturers are permitted. Some equipment designs specify single-manufacturer fuses for consistency.
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