Equivalent & Substitute Parts for BK/S505SC-4-R

Part Overview

The BK/S505SC-4-R is a 4 A, 250 V AC/DC ceramic cartridge fuse with a 5mm x 20mm (axial) form factor, manufactured by Eaton - Electronics Division. This slow-blow fuse is designed for through-hole mounting applications and is currently in active production status with 937 pieces in stock. Alternative equivalent parts are necessary to support supply chain flexibility, extended lead time management, and design validation across multiple manufacturer sources while maintaining identical electrical and mechanical specifications.

Substiute Parts

BK/S505SC-4-R

Eaton - Electronics DivisionIn Stock: 1037BK/S505SC-4-R Datasheet

Current PartRFQ

BK-S505SC-4-R

Eaton - Electronics DivisionIn Stock: 1085BK-S505SC-4-R Datasheet

Parametric EquivalentRFQ

0215004.MXESPP

Littelfuse Inc.In Stock: 30240215004.MXESPP Datasheet

Parametric EquivalentRFQ

0659P4000-13

Bel Fuse Inc.In Stock: 25010659P4000-13 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the BK/S505SC-4-R ceramic cartridge fuse is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Current Rating: 4 A
• Voltage Rating (AC): 250 V
• Fuse Type: Cartridge, Ceramic
• Response Time: Slow Blow
• Package / Case: 5mm x 20mm (Axial)
• Mounting Type: Through Hole
• Breaking Capacity @ Rated Voltage: 1.5 kA
• Physical Dimensions: 0.205" Dia x 0.787" L (5.20mm x 20.00mm)

All substitute parts listed meet these mandatory parameters. Variations in secondary characteristics such as melting I²t, DC cold resistance, and operating temperature ranges do not disqualify substitution eligibility when primary electrical and mechanical specifications are identical.

Parameter Comparison

Engineering Selection Recommendations

All four parts listed are functionally equivalent and interchangeable based on electrical and mechanical specifications. Selection among these alternatives should be based on the following factors:

Manufacturer Continuity: The BK-S505SC-4-R maintains identical manufacturer sourcing (Eaton - Electronics Division) as the primary part, with higher inventory availability (1075 pieces) and represents the most direct substitution path.

Multi-Source Qualification: The 0215004.MXESPP (Littelfuse Inc.) and 0659P4000-13 (Bel Fuse Inc.) provide independent manufacturer alternatives with the highest inventory levels (2971 and 2403 pieces respectively), supporting supply chain diversification and extended availability.

Regulatory Compliance: All substitute parts maintain active product status and RoHS3 compliance. The Littelfuse and Bel Fuse alternatives provide expanded operating temperature ranges (-55°C ~ 125°C) compared to the Eaton variants, which may be advantageous in temperature-sensitive applications.

Certification Coverage: All parts carry relevant international approvals. The Eaton primary part includes BSI, CCC/CQC, CSA, cURus, IMQ, KC, PSE/JET, SEMKO, and VDE certifications. Littelfuse and Bel Fuse alternatives carry overlapping certifications (CE, CQC, CSA, KC, PSE, UR, VDE) suitable for equivalent regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can BK-S505SC-4-R be used as a direct replacement for BK/S505SC-4-R?

A: Yes. Both parts are manufactured by Eaton - Electronics Division and share identical electrical ratings (4 A, 250 V AC/DC), fuse type (ceramic cartridge), response time (slow blow), and physical dimensions (5mm x 20mm axial). The parts are functionally interchangeable.

Q: What is the difference between the Eaton S505 series and the Littelfuse 215SP series?

A: Both series meet identical electrical and mechanical specifications for this 4 A, 250 V application. The primary differences are manufacturer-specific characteristics including melting I²t values (41 vs. 46.96), DC cold resistance (0.018 vs. 0.0185 Ohms), and operating temperature range (-55°C ~ 125°C for Littelfuse). These differences do not affect substitution eligibility.

Q: Are there any compatibility issues with the 5mm x 20mm form factor across manufacturers?

A: No. All substitute parts maintain the identical 5mm x 20mm (axial) package specification with 0.205" diameter and 0.787" length. Through-hole mounting compatibility is preserved across all alternatives.

Q: Which substitute part offers the best inventory availability?

A: The 0215004.MXESPP (Littelfuse Inc.) provides the highest inventory level at 2971 pieces in stock, followed by 0659P4000-13 (Bel Fuse Inc.) at 2403 pieces.

Q: Do all substitute parts carry the same regulatory certifications?

A: All parts carry relevant international certifications. The Eaton primary part includes BSI, CCC/CQC, CSA, cURus, IMQ, KC, PSE/JET, SEMKO, and VDE approvals. Littelfuse and Bel Fuse alternatives carry CE, CQC, CSA, KC, PSE, UR, and VDE certifications, providing equivalent regulatory coverage for most applications.

Q: What is the significance of the melting I²t variation across these parts?

A: Melting I²t represents the thermal energy required to melt the fuse element. Variations (41 to 51.2 across the four parts) reflect manufacturer-specific design characteristics but do not affect substitution eligibility when all other electrical parameters remain constant at 4 A, 250 V, and 1.5 kA breaking capacity.

Q: Can these fuses be used in both AC and DC applications?

A: Yes. All parts are rated for 4 A at 250 V AC/DC, supporting both alternating and direct current applications within the specified voltage and current limits.