Equivalent & Substitute Parts for BK/S506-V-8-R

Part Overview

The BK/S506-V-8-R is an 8A 250VAC slow-blow glass cartridge fuse manufactured by Eaton - Electronics Division. This through-hole component is designed for circuit protection in AC/DC applications with a 5mm x 20mm form factor. The part maintains active product status with 963 units in current inventory. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when supply chain optimization is required.

Substiute Parts

BK/S506-V-8-R

Eaton - Electronics DivisionIn Stock: 979BK/S506-V-8-R Datasheet

Current PartRFQ

0218008.MXEP

Littelfuse Inc.In Stock: 17440218008.MXEP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the BK/S506-V-8-R is determined by strict equivalence across all critical electrical and mechanical parameters. The following parameters must match exactly:

• Current Rating: 8 A (no tolerance variation permitted)
• Voltage Rating (AC): 250 V (no tolerance variation permitted)
• Fuse Type: Cartridge, Glass (form factor and construction method)
• Response Time: Slow Blow (thermal response characteristic)
• Package / Case: 5mm x 20mm (Axial) (physical dimensions and mounting orientation)
• Mounting Type: Through Hole (PCB assembly method)
• Breaking Capacity @ Rated Voltage: 80 A (fault current handling capability)
• RoHS Compliance: ROHS3 Compliant (environmental and regulatory requirement)

The substitute part 0218008.MXEP (Littelfuse Inc., Series 218) meets all critical substitution criteria and is classified as a direct equivalent.

Parameter Comparison

Engineering Selection Recommendations

The 0218008.MXEP (Littelfuse Inc.) is a direct functional equivalent to the BK/S506-V-8-R based on matching critical electrical and mechanical parameters. Both components are active products with ROHS3 compliance and appropriate regulatory certifications for their respective markets.

Selection Basis:

• Both parts satisfy identical current rating (8 A), voltage rating (250 V AC), fuse type (Cartridge, Glass), response time (Slow Blow), package dimensions (5mm x 20mm), and breaking capacity (80 A) requirements.
• Physical dimensions are within acceptable tolerance for through-hole PCB mounting.
• Both components hold overlapping regulatory approvals including CSA, PSE, and VDE certifications.
• Inventory availability differs: BK/S506-V-8-R has 963 units in stock; 0218008.MXEP has 1734 units in stock.

The substitute part is suitable for direct replacement in applications where the BK/S506-V-8-R is specified, provided that the application does not require specific manufacturer certification or performance characteristics beyond the stated electrical parameters.

Frequently Asked Questions (FAQ)

Q: Can the 0218008.MXEP replace the BK/S506-V-8-R in all applications?

A: Yes, the 0218008.MXEP meets all critical electrical and mechanical substitution criteria. Both components share identical current rating (8 A), voltage rating (250 V AC), fuse type (Cartridge, Glass), response time (Slow Blow), package dimensions (5mm x 20mm), and breaking capacity (80 A). Physical dimensions are within acceptable tolerance for through-hole mounting.

Q: What is the difference in melting I²t between these parts?

A: The BK/S506-V-8-R has a melting I²t of 255.8, while the 0218008.MXEP has a melting I²t of 341.5. Both parts are classified as slow-blow fuses with identical response time characteristics. The difference in I²t values reflects different thermal mass and construction methods between manufacturers but does not affect substitution eligibility for standard circuit protection applications.

Q: Are the physical dimensions identical?

A: Physical dimensions are slightly different but within acceptable tolerance for through-hole PCB mounting. The BK/S506-V-8-R measures 0.218" Dia x 0.831" L (5.54mm x 21.10mm), while the 0218008.MXEP measures 0.228" Dia x 0.886" L (5.80mm x 22.50mm). Both conform to the 5mm x 20mm (Axial) package specification and are compatible with standard fuse holders designed for this form factor.

Q: Which regulatory certifications are common to both parts?

A: Both the BK/S506-V-8-R and 0218008.MXEP hold CSA, PSE, and VDE certifications. The Eaton part includes additional certifications (BSI, cULus, IMQ, SEMKO), while the Littelfuse part includes CE, K-MARK, and UL certifications. Selection should be based on the specific regulatory requirements of the target application and market.

Q: What is the DC cold resistance difference?

A: The BK/S506-V-8-R has a DC cold resistance of 0.007 Ohms, while the 0218008.MXEP has 0.0059 Ohms. This minor difference reflects different internal conductor materials and construction but does not affect circuit protection performance or substitution eligibility.

Q: Is there a difference in operating temperature range?

A: The BK/S506-V-8-R does not specify an operating temperature range in the provided data. The 0218008.MXEP specifies -55°C ~ 125°C. For applications requiring operation outside standard ambient conditions, the Littelfuse part provides documented temperature performance specifications.