Equivalent & Substitute Parts for BK/S505-V-8-R

Part Overview

The BK/S505-V-8-R is an 8 A, 250 V AC/DC ceramic cartridge fuse with a 5mm x 20mm axial form factor and slow-blow response characteristics. This component is classified as obsolete, which necessitates identification of active equivalent alternatives for ongoing design support and procurement continuity. The fuse is designed for through-hole mounting applications requiring reliable overcurrent protection in industrial and commercial equipment.

Substiute Parts

BK/S505-V-8-R

Eaton - Electronics DivisionIn Stock: 1045BK/S505-V-8-R Datasheet

Current PartRFQ

BK-S505SC-8-R

Eaton - Electronics DivisionIn Stock: 3799BK-S505SC-8-R Datasheet

DirectRFQ

0215008.MRET1P

Littelfuse Inc.In Stock: 18410215008.MRET1P Datasheet

SimilarRFQ

0215008.MXEP

Littelfuse Inc.In Stock: 161270215008.MXEP Datasheet

SimilarRFQ

0215008.MXESPP

Littelfuse Inc.In Stock: 25920215008.MXESPP Datasheet

SimilarRFQ

5HTP 8-R

Bel Fuse Inc.In Stock: 21225HTP 8-R Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

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

• Current Rating: 8 A (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Fuse Type: Cartridge, Ceramic (exact match required)
• Response Time: Slow Blow (exact match required)
• Package / Case: 5mm x 20mm (Axial) (exact match required)
• Mounting Type: Through Hole (exact match required)
• Breaking Capacity @ Rated Voltage: 1.5 kA (exact match required)

All identified substitute parts meet these core electrical and mechanical parameters. Variations in physical dimensions (within manufacturing tolerances), DC cold resistance, melting I²t values, and approval agency certifications do not preclude substitution when the primary functional parameters align.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: BK-S505SC-8-R

The BK-S505SC-8-R is the direct successor from Eaton - Electronics Division. This part maintains identical electrical specifications and melting I²t characteristics to the obsolete BK/S505-V-8-R. The part is active in production with 3,753 units in stock. It carries the same approval agencies as the original part, including BSI, CQC, CSA, cULus, IMQ, KC, PSE/JET, SEMKO, and VDE. RoHS compliance status is confirmed. This part is the preferred choice for direct replacement in existing designs.

Secondary Recommendations: Littelfuse 215 Series (0215008.MRET1P, 0215008.MXEP, 0215008.MXESPP)

The Littelfuse 215 series parts meet all core electrical and mechanical parameters. These parts are active with substantial inventory availability (1,751 to 16,100 units). All three variants carry ROHS3 compliance and support operating temperatures from -55°C to 125°C. Approval agencies include CE, CSA, KC, PSE, SEMKO, UL, and VDE. The melting I²t value of 209.88 differs slightly from the original specification of 228, but remains within acceptable substitution parameters for slow-blow ceramic cartridge fuses. Packaging options include Cut Tape (0215008.MRET1P) and Bulk (0215008.MXEP, 0215008.MXESPP).

Tertiary Recommendation: Bel Fuse 5HTP 8-R

The 5HTP 8-R from Bel Fuse Inc. satisfies all core electrical and mechanical requirements. This part is active with 2,105 units in stock and carries ROHS3 compliance. Approval agencies include CE, CSA, cULus, and PSE. The melting I²t value of 330 is elevated compared to the original specification, indicating a slightly slower thermal response. This part is suitable for applications where the extended thermal response does not conflict with circuit protection requirements.

Frequently Asked Questions (FAQ)

Q: Can BK-S505SC-8-R be used as a direct replacement for BK/S505-V-8-R?

A: Yes. BK-S505SC-8-R is the active equivalent from the same manufacturer (Eaton - Electronics Division). It maintains identical current rating (8 A), voltage rating (250 V AC), fuse type (ceramic cartridge), response time (slow blow), package dimensions (5mm x 20mm axial), and breaking capacity (1.5 kA). The part is in active production status with confirmed RoHS compliance.

Q: What is the difference between the Littelfuse 215 series parts?

A: All three Littelfuse 215 series parts (0215008.MRET1P, 0215008.MXEP, 0215008.MXESPP) are electrically and mechanically equivalent. The primary difference is packaging: 0215008.MRET1P is supplied in Cut Tape format, while 0215008.MXEP and 0215008.MXESPP are supplied in Bulk. The 0215008.MXESPP variant is designated as 215SP series. All three carry identical electrical specifications and certifications.

Q: Are there dimensional differences between substitute parts?

A: Minor dimensional variations exist within manufacturing tolerances. The main part BK/S505-V-8-R specifies 0.218" Dia x 0.831" L (5.54mm x 21.10mm). BK-S505SC-8-R specifies 0.205" Dia x 0.787" L (5.20mm x 20.00mm). Littelfuse parts specify 0.228" Dia x 0.886" L (5.80mm x 22.50mm). Bel Fuse 5HTP 8-R specifies 0.217" Dia x 0.827" L (5.50mm x 21.00mm). These variations remain within the 5mm x 20mm nominal package classification and do not affect through-hole mounting compatibility.

Q: Does the melting I²t difference affect substitution suitability?

A: The melting I²t parameter characterizes thermal response time. The original part specifies 228. BK-S505SC-8-R maintains this value. Littelfuse parts specify 209.88 (slightly faster response). Bel Fuse 5HTP 8-R specifies 330 (slightly slower response). All values are consistent with slow-blow ceramic fuse characteristics. Substitution is valid when circuit protection requirements do not mandate the exact original I²t value.

Q: Which substitute part has the best approval agency coverage?

A: BK-S505SC-8-R maintains the broadest approval agency alignment with the original part, including BSI, CCC/CQC, CSA, cURus, IMQ, KC, PSE/JET, SEMKO, and VDE. For applications requiring specific regional certifications, verify that the selected substitute carries the required approval agencies for the target market.

Q: Are all substitute parts RoHS compliant?

A: BK-S505SC-8-R is confirmed RoHS Compliant. All Littelfuse 215 series parts (0215008.MRET1P, 0215008.MXEP, 0215008.MXESPP) are ROHS3 Compliant. Bel Fuse 5HTP 8-R is ROHS3 Compliant. The original BK/S505-V-8-R RoHS status is not specified in the provided data.

Q: What is the inventory status of each substitute?

A: BK-S505SC-8-R: 3,753 units. 0215008.MRET1P: 1,751 units. 0215008.MXEP: 16,100 units. 0215008.MXESPP: 2,551 units. 5HTP 8-R: 2,105 units. All substitute parts are in active production with confirmed stock availability.