BK/S500-12-R Equivalent & Substitute Parts

Part Overview

The BK/S500-12-R is a 12 A, 250 V AC/DC fast-blow glass cartridge fuse manufactured by Eaton - Electronics Division in the S500 series. This fuse is designed for 5mm x 20mm holder applications and requires an external fuse holder for installation. The product is classified as obsolete, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for continued system support and component replacement.

Substiute Parts

BK/S500-12-R

Eaton - Electronics DivisionIn Stock: 793BK/S500-12-R Datasheet

Current PartRFQ

FSC-12A

OptiFuseIn Stock: 837FSC-12A Datasheet

Parametric EquivalentRFQ

FSD-12A

OptiFuseIn Stock: 6264FSD-12A Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the BK/S500-12-R are identified based on strict parametric equivalence across the following critical specifications:

Electrical Parameters:

• Current Rating: 12 A (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Response Time: Fast Blow (exact match required)

Mechanical Parameters:

• Fuse Type: Cartridge, Glass (exact match required)
• Package / Case: 5mm x 20mm (exact match required)
• Mounting Type: Requires Holder (exact match required)
• Physical Dimensions: 0.205" Dia x 0.787" L (exact match required)

Environmental Parameters:

• Moisture Sensitivity Level: 1 (Unlimited) (exact match required)

Both substitute parts FSC-12A and FSD-12A satisfy all mandatory parametric requirements for direct substitution with the obsolete BK/S500-12-R.

Parameter Comparison

Engineering Selection Recommendations

Both FSC-12A and FSD-12A are active product alternatives to the obsolete BK/S500-12-R and provide parametric equivalence across all critical electrical and mechanical specifications.

FSC-12A Selection Criteria: The FSC-12A is certified to UL 248 standard with a breaking capacity of 100 A at rated voltage and an operating temperature range of -55°C to 90°C. This substitute is suitable for applications requiring UL certification compliance and higher breaking capacity performance.

FSD-12A Selection Criteria: The FSD-12A is certified to IEC 60127 standard with a breaking capacity of 35 A at rated voltage and an extended operating temperature range of -55°C to 125°C. This substitute is suitable for applications requiring IEC certification compliance and extended high-temperature operation.

Both substitute parts are ROHS3 compliant and REACH unaffected. Selection between FSC-12A and FSD-12A depends on the specific regulatory certification requirements and operating temperature constraints of the target application.

Frequently Asked Questions (FAQ)

Q: Can FSC-12A and FSD-12A be used interchangeably with BK/S500-12-R?

A: Both FSC-12A and FSD-12A meet all mandatory parametric requirements for direct substitution with BK/S500-12-R. Selection between the two alternatives depends on certification requirements (UL 248 versus IEC 60127) and operating temperature range specifications of the application.

Q: What are the key differences between FSC-12A and FSD-12A?

A: The primary differences are certification standards, breaking capacity, and operating temperature range. FSC-12A carries UL 248 certification with 100 A breaking capacity and -55°C to 90°C operating range. FSD-12A carries IEC 60127 certification with 35 A breaking capacity and -55°C to 125°C operating range.

Q: Are the physical dimensions identical across all three fuses?

A: Yes. BK/S500-12-R, FSC-12A, and FSD-12A all share identical physical dimensions of 0.205" diameter by 0.787" length (5.20mm x 20.00mm) and are compatible with standard 5mm x 20mm fuse holders.

Q: Do the substitute parts require the same holder as the original BK/S500-12-R?

A: Yes. All three fuses require an external holder for installation. The 5mm x 20mm package specification ensures mechanical compatibility with existing holder installations.

Q: What is the electrical rating equivalence?

A: All three fuses share identical electrical ratings: 12 A current rating, 250 V AC voltage rating, and fast-blow response time. This ensures functional equivalence in circuit protection applications.

Q: Are environmental compliance certifications important for selection?

A: Both substitute parts are ROHS3 compliant and REACH unaffected. If the application requires specific regulatory certification (UL or IEC), selection should be based on the applicable standard for the target market or application.