Equivalent & Substitute Parts for BK/S505-8-R Ceramic Fuse

Part Overview

The BK/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 5mm x 20mm holder applications and is currently active in production with 840 pieces in stock. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, fuse type, and response characteristics to ensure direct functional replacement in circuit protection applications.

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
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the BK/S505-8-R is determined by the following critical parameters:

Primary Matching Criteria:

Current Rating: 8 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 Factors:

Breaking Capacity @ Rated Voltage: 1.5kA or higher
Melting I²t: Within acceptable range for application
RoHS3 Compliance: Required for regulatory alignment
Product Status: Active

All substitute parts listed meet these criteria and are direct functional equivalents suitable for replacement in the same circuit protection application.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (A)	Voltage Rating - AC (V)	Package / Case	Breaking Capacity @ Rated Voltage	Melting I²t	DC Cold Resistance (Ohms)	Product Status	Inventory (Pcs)
BK/S505-8-R	Eaton - Electronics Division	8	250	5mm x 20mm	1.5kA	228	0.0077	Active	840
BK1/S505-8-R	Eaton - Electronics Division	8	250	5mm x 20mm	1.5kA	228	0.0077	Active	1449
0215008.HXP	Littelfuse	8	250	5mm x 20mm	1.5kA	209.88	0.0092	Active	1654
0001.2513	SCHURTER Inc.	8	250	5mm x 20mm	1kA AC, 1.5kA DC	268	Not Specified	Active	55913
0001.2713.11	SCHURTER Inc.	8	250	5mm x 20mm	1kA AC, 1.5kA DC	268	Not Specified	Active	1466
0215008.MXP	Littelfuse Inc.	8	250	5mm x 20mm	1.5kA	209.88	0.0092	Active	35100
0215008.TXP	Littelfuse Inc.	8	250	5mm x 20mm	1.5kA	209.88	0.0092	Active	926
TCC-8A	OptiFuse	8	250	5mm x 20mm	200A	75.422	0.0104	Active	1162
TCD-8A	OptiFuse	8	250	5mm x 20mm	1.5kA	Not Specified	Not Specified	Active	3883

Engineering Selection Recommendations

Primary Equivalent (Eaton Series): BK1/S505-8-R is the direct parametric equivalent from Eaton - Electronics Division with identical electrical and mechanical specifications to the BK/S505-8-R. This part offers higher inventory availability (1449 pcs) and maintains full compatibility with existing Eaton S505 series applications.

Littelfuse Alternatives (215 Series): 0215008.HXP, 0215008.MXP, and 0215008.TXP are parametric equivalents from Littelfuse Inc. All three parts meet the core electrical requirements (8 A, 250 V AC, 5mm x 20mm) with 1.5kA breaking capacity. The 0215008.MXP variant offers the highest inventory level (35100 pcs) among Littelfuse options. These parts carry CE, CSA, KC, PSE, SEMKO, UL, and VDE certifications.

SCHURTER Options (SPT and SMD-SPT Series): 0001.2513 and 0001.2713.11 provide extended DC voltage rating (150 V DC) in addition to 250 V AC, making them suitable for dual-voltage applications. The 0001.2513 variant has exceptional inventory availability (55913 pcs). Both carry cURus and VDE certifications.

OptiFuse Alternatives (TCC and TCD Series): TCC-8A and TCD-8A meet the core electrical and mechanical specifications. TCD-8A maintains 1.5kA breaking capacity matching the original part. Both carry cURus certification and support extended operating temperature range (-55°C to 125°C).

All substitute parts are ROHS3 compliant and active in production status.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts directly in place of the BK/S505-8-R?

A: Yes. All listed substitute parts match the critical parameters: 8 A current rating, 250 V AC voltage rating, 5mm x 20mm package dimensions, ceramic cartridge fuse type, and slow-blow response characteristic. Direct mechanical and electrical compatibility is confirmed for all listed alternatives.

Q: What is the difference between the Eaton BK/S505-8-R and BK1/S505-8-R?

A: Both parts are identical in electrical specifications (8 A, 250 V AC, 1.5kA breaking capacity, 228 melting I²t) and mechanical dimensions (5mm x 20mm). The BK1/S505-8-R variant has higher inventory availability (1449 pcs vs. 840 pcs) and includes CCC/CQC certification in addition to the standard approvals.

Q: Why do SCHURTER parts (0001.2513 and 0001.2713.11) have different breaking capacity specifications?

A: SCHURTER parts specify breaking capacity separately for AC and DC: 1kA AC and 1.5kA DC. This dual specification indicates the fuse can handle 1.5kA breaking capacity in DC applications while maintaining 1kA in AC applications. Both values meet or exceed the 1.5kA AC requirement of the original BK/S505-8-R.

Q: What does "Requires Holder" mean for mounting type?

A: All listed fuses are cartridge-type fuses that require a separate fuse holder for installation. The 5mm x 20mm dimensions specify the holder cavity size. The fuse itself does not mount directly to a PCB or panel; it must be inserted into a compatible 5mm x 20mm fuse holder.

Q: Are there voltage rating differences I should consider?

A: The main part and most substitutes are rated for 250 V AC. SCHURTER parts (0001.2513 and 0001.2713.11) additionally specify 150 V DC rating. If your application requires DC voltage protection, SCHURTER parts provide this extended capability. For AC-only applications, all parts are equivalent.

Q: What is the significance of melting I²t values?

A: Melting I²t indicates the thermal energy required to melt the fuse element. Values range from 75.422 (TCC-8A) to 268 (SCHURTER parts). Lower I²t values indicate faster response to overcurrent. All values are within acceptable ranges for 8 A slow-blow fuse applications. Selection should match your specific circuit protection requirements.

Q: Which substitute offers the best inventory availability?

A: The SCHURTER 0001.2513 offers the highest inventory level with 55913 pieces in stock. For Littelfuse options, 0215008.MXP provides 35100 pieces. For Eaton equivalents, BK1/S505-8-R has 1449 pieces available.

Q: Do all substitutes carry the same regulatory certifications?

A: No. Certification coverage varies by manufacturer. Eaton parts carry BSI, CQC, CSA, cULus, IMQ, KC, PSE/JET, SEMKO, and VDE approvals. Littelfuse parts carry CE, CSA, KC, PSE, SEMKO, UL, and VDE. SCHURTER parts carry cURus and VDE. OptiFuse parts carry cULus and UL 248 (TCC-8A) or cURus and IEC 60127 (TCD-8A). Verify certification requirements for your specific application region.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message