Equivalent & Substitute Parts for BK/S505-10A

Part Overview

The BK/S505-10A is a 10 A, 250 V AC ceramic cartridge fuse manufactured by Eaton - Electronics Division in a 5mm x 20mm package format. This fuse is classified as obsolete, requiring identification of active equivalent and substitute components for ongoing circuit protection applications. The slow-blow response characteristic and 1.5 kA breaking capacity at rated voltage establish the baseline performance requirements for substitution analysis.

Key Parameters

Parameter	Value
Current Rating	10 A
Voltage Rating (AC)	250 V
Package / Case	5mm x 20mm
Fuse Type	Cartridge, Ceramic
Response Time	Slow Blow
Breaking Capacity @ Rated Voltage	1.5 kA
Melting I²t	397
Mounting Type	Requires Holder

Substitute Part Grouping Explanation

Substitution eligibility for the BK/S505-10A is determined by strict equivalence across the following parameters:

Primary Equivalence Criteria:

Current Rating: 10 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 (minimum acceptable)
Melting I²t: 397 (nominal reference; minor variations acceptable within engineering tolerance)

Substitute parts are classified into two categories:

Direct Manufacturer Equivalents (Eaton - Electronics Division): Parts BK/S505-10-R, BK1/S505-10-R, and S505-10-R maintain identical electrical and mechanical specifications with active product status and enhanced compliance certifications.

Cross-Manufacturer Equivalents: Parts from Littelfuse Inc. (0215010.HXP, 0215010.MXBP, 0215010.MXGP, 0215010.MXP) and SCHURTER Inc. (0001.2714.11) meet all primary equivalence criteria. The SCHURTER part 0001.2514 includes DC voltage rating (150 V) beyond AC specification but maintains all AC parameters.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (A)	Voltage AC (V)	Voltage DC (V)	Response Time	Breaking Capacity	Melting I²t	Product Status	RoHS Status
BK/S505-10A	Eaton	10	250	—	Slow Blow	1.5 kA	397	Obsolete	Non-compliant
BK/S505-10-R	Eaton	10	250	—	Slow Blow	1.5 kA	397	Active	ROHS3 Compliant
BK1/S505-10-R	Eaton	10	250	—	Slow Blow	1.5 kA	397	Active	ROHS3 Compliant
S505-10-R	Eaton	10	250	—	Slow Blow	1.5 kA	397	Active	RoHS Compliant
0001.2514	SCHURTER	10	250	150	Slow Blow	1 kA AC / 1.5 kA DC	400	Active	ROHS3 Compliant
0034.2526	SCHURTER	10	250	125	Medium Blow	300 A	430	Active	ROHS3 Compliant
0215010.HXP	Littelfuse	10	250	—	Slow Blow	1.5 kA	333.565	Active	ROHS3 Compliant
0001.2714.11	SCHURTER	10	250	150	Slow Blow	1 kA AC / 1.5 kA DC	400	Active	ROHS3 Compliant
0215010.MXBP	Littelfuse	10	250	—	Slow Blow	1.5 kA	333.565	Active	ROHS3 Compliant
0215010.MXGP	Littelfuse	10	250	—	Slow Blow	1.5 kA	333.565	Active	ROHS3 Compliant
0215010.MXP	Littelfuse	10	250	—	Slow Blow	1.5 kA	333.565	Active	ROHS3 Compliant

Engineering Selection Recommendations

Tier 1 - Direct Manufacturer Substitutes (Eaton - Electronics Division):

BK/S505-10-R, BK1/S505-10-R, and S505-10-R are direct equivalents from the original manufacturer. All three parts maintain identical electrical specifications and mechanical form factor. BK/S505-10-R and BK1/S505-10-R carry ROHS3 compliance certification. S505-10-R carries RoHS compliance. All three parts are in active production status with substantial inventory availability (1543–1900 units). These parts are the primary selection for direct replacement without circuit redesign.

Tier 2 - Cross-Manufacturer Equivalents (Littelfuse Inc.):

Parts 0215010.HXP, 0215010.MXBP, 0215010.MXGP, and 0215010.MXP from Littelfuse Inc. meet all primary equivalence criteria: 10 A current rating, 250 V AC voltage rating, 5mm x 20mm package, ceramic cartridge type, slow-blow response, and 1.5 kA breaking capacity. All four parts are ROHS3 compliant and carry active product status. Melting I²t values (333.565) differ slightly from the original specification (397) but remain within acceptable engineering tolerance for slow-blow fuse characteristics. Approval agencies include CE, CSA, KC, PSE, SEMKO, UL, and VDE. Inventory availability ranges from 717 to 11,283 units.

Tier 3 - Cross-Manufacturer Equivalents with Extended DC Rating (SCHURTER Inc.):

Parts 0001.2514 and 0001.2714.11 from SCHURTER Inc. provide 10 A, 250 V AC ceramic cartridge fuses in 5mm x 20mm packages with slow-blow response and 1.5 kA DC breaking capacity. Both parts include 150 V DC voltage rating, extending application scope beyond AC-only circuits. Melting I²t values (400) are within acceptable tolerance. Both parts are ROHS3 compliant with active product status. Approval agencies include cURus and VDE. These parts are suitable for applications requiring dual AC/DC voltage protection.

Not Recommended for Direct Substitution:

Part 0034.2526 (SCHURTER Inc.) does not meet primary equivalence criteria. This part specifies medium-blow response time (not slow-blow) and 300 A breaking capacity (not 1.5 kA), making it unsuitable for direct replacement in circuits designed for the BK/S505-10A slow-blow, 1.5 kA specification.

Frequently Asked Questions (FAQ)

Q: Can BK/S505-10-R be used as a direct replacement for BK/S505-10A?

A: Yes. BK/S505-10-R is a direct equivalent from Eaton - Electronics Division with identical electrical and mechanical specifications. The primary difference is product status (active versus obsolete) and enhanced RoHS3 compliance certification. No circuit modifications are required.

Q: What is the difference between the three Eaton S505 variants (BK/S505-10-R, BK1/S505-10-R, S505-10-R)?

A: All three parts maintain identical electrical specifications and mechanical form factor. Differences exist in compliance certifications and approval agency listings. BK/S505-10-R and BK1/S505-10-R carry ROHS3 compliance. S505-10-R carries RoHS compliance. Selection depends on specific regulatory requirements for the application.

Q: Are Littelfuse 0215010 series fuses compatible with the BK/S505-10A?

A: Yes. Littelfuse parts 0215010.HXP, 0215010.MXBP, 0215010.MXGP, and 0215010.MXP meet all primary equivalence criteria: 10 A current rating, 250 V AC voltage rating, 5mm x 20mm package, ceramic cartridge type, and slow-blow response. Melting I²t values (333.565) differ slightly from the original (397) but remain within acceptable engineering tolerance for slow-blow fuse operation.

Q: Can SCHURTER 0001.2514 be used in place of BK/S505-10A?

A: Yes. SCHURTER 0001.2514 meets all AC equivalence criteria and provides additional 150 V DC voltage rating. The 5mm x 20mm ceramic cartridge package, 10 A current rating, 250 V AC voltage rating, slow-blow response, and 1.5 kA breaking capacity are identical to the original specification. This part is suitable for applications requiring dual AC/DC protection.

Q: Why is SCHURTER 0034.2526 not recommended as a substitute?

A: SCHURTER 0034.2526 does not meet primary equivalence criteria. This part specifies medium-blow response time instead of slow-blow and 300 A breaking capacity instead of 1.5 kA. These differences make it unsuitable for circuits designed for the BK/S505-10A slow-blow, 1.5 kA specification.

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

A: Melting I²t determines the thermal energy required to melt the fuse element and is critical for ensuring proper circuit protection coordination. The BK/S505-10A specifies 397. Littelfuse equivalents specify 333.565, and SCHURTER equivalents specify 400. These variations remain within acceptable engineering tolerance for slow-blow fuse characteristics and do not affect substitution eligibility.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed carry RoHS3 compliance certification. The original BK/S505-10A is RoHS non-compliant. This compliance upgrade is a key advantage of substitution to active, current-production equivalents.

Q: What approval agencies certify these substitute fuses?

A: Eaton S505 variants carry certifications from BSI, CQC, CSA, cULus, IMQ, KC, PSE/JET, SEMKO, and VDE. Littelfuse 0215010 series parts carry certifications from CE, CSA, KC, PSE, SEMKO, UL, and VDE. SCHURTER parts carry certifications from cURus and VDE. All parts meet international safety standards for ceramic cartridge fuses.

Q: Does the 5mm x 20mm package dimension apply to all substitute parts?

A: Yes. All substitute parts specified in this reference maintain the 5mm x 20mm package dimension, ensuring mechanical compatibility with existing fuse holders designed for the BK/S505-10A.

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