BK/S501-10A Ceramic Fuse 10A 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The BK/S501-10A is a ceramic cartridge fuse manufactured by Eaton - Electronics Division, rated for 10 amperes at 250 volts AC/DC with fast-blow response characteristics. The fuse element is housed in a 5mm x 20mm ceramic body and requires a compatible fuse holder for installation. This part carries an obsolete product status, necessitating identification of active equivalent and substitute components that maintain identical electrical and mechanical specifications for continued system support and procurement.

Key Parameters

Parameter	Value
Current Rating	10 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Ceramic
Response Time	Fast Blow
Package / Case	5mm x 20mm
Breaking Capacity @ Rated Voltage	1.5 kA
Mounting Type	Requires Holder
Size / Dimension	0.205" Dia x 0.787" L (5.20mm x 20.00mm)

Substitute Part Grouping Explanation

Substitution eligibility for the BK/S501-10A is determined by strict equivalence across the following parameters: current rating (10 A), voltage rating (250 V AC), fuse type (cartridge ceramic), response time (fast blow), package dimensions (5mm x 20mm), and breaking capacity (1.5 kA). All substitute parts listed maintain these core electrical and mechanical specifications, ensuring direct functional replacement without circuit modification or holder redesign.

The substitute parts are categorized as follows:

Parametric Equivalents (Eaton - Electronics Division): BK1/S501-10-R and S501-10-R represent active-status variants within the same manufacturer series, offering improved RoHS compliance and expanded inventory availability compared to the obsolete BK/S501-10A.

Direct Manufacturer Equivalents: 0001.1014 (SCHURTER Inc.) and 5HF 10-R (Bel Fuse Inc.) are functionally identical ceramic cartridge fuses from alternative manufacturers, each meeting the specified electrical parameters and dimensional requirements.

Similar Manufacturer Equivalents: The Littelfuse 216 series components (0216010.HXP, 0216010.MXP, 0216010.MXBP, 0216010.MXF11P, 0216010.TXP, 0216010.VXP) provide ceramic cartridge fuse solutions with matching current, voltage, response time, and package specifications, with variations in internal construction and certification profiles.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (A)	Voltage Rating (V AC)	Fuse Type	Response Time	Package (mm)	Breaking Capacity (kA)	Product Status	RoHS Status
BK/S501-10A	Eaton - Electronics Division	10	250	Cartridge, Ceramic	Fast Blow	5 x 20	1.5	Obsolete	Non-compliant
BK1/S501-10-R	Eaton - Electronics Division	10	250	Cartridge, Ceramic	Fast Blow	5 x 20	1.5	Active	Compliant
S501-10-R	Eaton - Electronics Division	10	250	Cartridge, Ceramic	Fast Blow	5 x 20	1.5	Active	ROHS3 Compliant
0001.1014	SCHURTER Inc.	10	250	Cartridge, Ceramic	Fast Blow	5 x 20	1.5	Active	ROHS3 Compliant
5HF 10-R	Bel Fuse Inc.	10	250	Cartridge, Ceramic	Fast Blow	5 x 20	1.5	Active	ROHS3 Compliant
0216010.HXP	Littelfuse	10	250	Cartridge, Ceramic	Fast Blow	5 x 20	1.5	Active	ROHS3 Compliant
0216010.MXP	Littelfuse Inc.	10	250	Cartridge, Ceramic	Fast Blow	5 x 20	1.5	Active	ROHS3 Compliant
0216010.MXBP	Littelfuse Inc.	10	250	Cartridge, Ceramic	Fast Blow	5 x 20	1.5	Active	ROHS3 Compliant
0216010.MXF11P	Littelfuse Inc.	10	250	Cartridge, Ceramic	Fast Blow	5 x 20	1.5	Active	ROHS3 Compliant
0216010.TXP	Littelfuse Inc.	10	250	Cartridge, Ceramic	Fast Blow	5 x 20	1.5	Active	ROHS3 Compliant
0216010.VXP	Littelfuse Inc.	10	250	Cartridge, Ceramic	Fast Blow	5 x 20	1.5	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation - Eaton Series S501 Active Variants:

S501-10-R represents the optimal direct replacement for BK/S501-10A within the Eaton product line. This part maintains identical electrical specifications while offering active product status, ROHS3 compliance, and significantly higher inventory availability (80,100 units in stock). The S501-10-R carries certification from BSI, CSA, cULus, IMQ, SEMKO, and VDE, matching the approval agencies of the original part.

BK1/S501-10-R serves as an alternative within the same manufacturer series, with active status and RoHS compliance, though with lower inventory levels (1,691 units).

Secondary Recommendation - Cross-Manufacturer Direct Equivalents:

0001.1014 (SCHURTER Inc., SP 5x20 series) and 5HF 10-R (Bel Fuse Inc., 5HF series) are functionally identical ceramic cartridge fuses meeting all electrical and dimensional parameters. Both parts carry active product status and ROHS3 compliance. SCHURTER 0001.1014 includes expanded operating temperature specification (-55°C to 125°C) and REACH unaffected status. Bel Fuse 5HF 10-R provides equivalent performance with CCC, CE, CSA, cURus, PSE, and SEMKO certifications.

Tertiary Recommendation - Littelfuse 216 Series:

The Littelfuse 216 series (0216010.HXP, 0216010.MXP, 0216010.MXBP, 0216010.MXF11P, 0216010.TXP, 0216010.VXP) comprises parametric equivalents with identical electrical specifications and ROHS3 compliance. These parts feature comprehensive certification coverage including CCC, CE, CSA, KC, PSE, SEMKO, UL, and VDE. Operating temperature range extends to -55°C to 125°C. Selection among Littelfuse variants depends on specific internal construction requirements and certification profile alignment with system design standards.

Compliance Considerations:

All recommended substitute parts carry ROHS3 compliance or equivalent environmental certification, addressing the non-compliant status of the obsolete BK/S501-10A. Littelfuse and SCHURTER components include REACH unaffected status documentation. Certification agency alignment should be verified against system design requirements, particularly for applications requiring specific approval bodies (UL, VDE, CSA, etc.).

Frequently Asked Questions (FAQ)

Q: Can S501-10-R directly replace BK/S501-10A without any circuit or holder modifications?

A: Yes. S501-10-R is a parametric equivalent with identical current rating (10 A), voltage rating (250 V AC), fuse type (cartridge ceramic), response time (fast blow), package dimensions (5mm x 20mm), and breaking capacity (1.5 kA). No circuit redesign or holder replacement is required. The part installs directly into existing BK/S501-10A fuse holders.

Q: What is the difference between the Eaton S501-10-R variants (BK1/S501-10-R and S501-10-R)?

A: Both are active-status replacements for the obsolete BK/S501-10A. S501-10-R offers significantly higher inventory availability (80,100 units versus 1,691 units for BK1/S501-10-R) and carries ROHS3 compliance designation. BK1/S501-10-R carries RoHS compliant status. Both maintain identical electrical specifications and approval certifications. S501-10-R is the preferred choice for new procurement due to inventory depth and compliance status.

Q: Are Littelfuse 216 series fuses (0216010.HXP, 0216010.MXP, etc.) interchangeable with each other?

A: Yes, within the context of the BK/S501-10A replacement requirement. All Littelfuse 216 series variants listed maintain identical electrical parameters (10 A, 250 V AC, fast blow, 5x20mm, 1.5 kA breaking capacity) and ROHS3 compliance. Differences exist in internal construction and specific certification profiles, but electrical performance and physical compatibility are equivalent. Selection should be based on specific certification requirements or internal construction specifications for the application.

Q: What is the significance of the melting I²t parameter shown for some substitute parts?

A: Melting I²t values (141 for SCHURTER 0001.1014, 227 for Bel Fuse 5HF 10-R, 154.34 for Littelfuse 216 series) represent the thermal energy required to melt the fuse element. While these values differ among manufacturers, all parts maintain the same fast-blow response time classification and 1.5 kA breaking capacity at rated voltage. These variations reflect different internal fuse element designs but do not affect functional equivalence for the specified 10 A, 250 V AC application.

Q: Can I use a substitute part from a different manufacturer if my system design specifies Eaton components?

A: Substitution depends on system design requirements and certification specifications. If the design specifies Eaton brand exclusively, S501-10-R or BK1/S501-10-R must be used. If the design specifies electrical parameters (10 A, 250 V AC, ceramic cartridge, 5x20mm, fast blow) and approval agencies (CSA, cULus, VDE, etc.), cross-manufacturer equivalents such as SCHURTER 0001.1014, Bel Fuse 5HF 10-R, or Littelfuse 216 series parts are acceptable. Verify certification agency alignment with system design documentation before substitution.

Q: What is the difference between RoHS compliant and ROHS3 compliant status?

A: RoHS compliant indicates conformance to the original Restriction of Hazardous Substances directive. ROHS3 compliant indicates conformance to the updated RoHS 3 directive (2015/863/EU), which includes additional restricted substances. ROHS3 compliance represents a more current environmental standard. S501-10-R carries ROHS3 compliant status, while BK1/S501-10-R carries RoHS compliant status. For new designs, ROHS3 compliant parts are preferred.

Q: Are there any operating temperature limitations I should consider when selecting a substitute?

A: The original BK/S501-10A does not specify operating temperature range. SCHURTER 0001.1014, Bel Fuse 5HF 10-R, and all Littelfuse 216 series variants specify -55°C to 125°C operating temperature range. Eaton S501 series variants do not specify operating temperature. If your application requires operation outside standard ambient conditions, select parts with documented temperature specifications (SCHURTER, Bel Fuse, or Littelfuse options).

Q: What inventory considerations should influence my selection?

A: S501-10-R offers the highest inventory availability (80,100 units in stock), making it the optimal choice for high-volume procurement or long-term supply assurance. SCHURTER 0001.1014 (5,333 units), Bel Fuse 5HF 10-R (4,792 units), and Littelfuse 216 series variants (ranging from 822 to 1,636 units) provide adequate inventory for standard applications. BK1/S501-10-R (1,691 units) offers moderate availability within the Eaton product line.

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