BK/S501-V-250-R Equivalent & Substitute Parts

Part Overview

The BK/S501-V-250-R is a ceramic cartridge fuse manufactured by Eaton - Electronics Division, rated at 250 mA, 250 V AC/DC with fast-blow response characteristics. This through-hole component is designed for circuit protection in industrial and commercial applications. The part maintains active product status with 929 units in current inventory. Substitute parts are identified to provide design flexibility, supply chain alternatives, and component availability options when the primary part is unavailable or when design requirements permit equivalent electrical and mechanical specifications.

Substiute Parts

BK/S501-V-250-R

Eaton - Electronics DivisionIn Stock: 998BK/S501-V-250-R Datasheet

Current PartRFQ

0216.250MXEP

Littelfuse Inc.In Stock: 56400216.250MXEP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the BK/S501-V-250-R are identified based on strict electrical and mechanical parameter matching. The substitution logic requires equivalence in the following critical parameters:

Electrical Parameters (Must Match):

• Current Rating: 250 mA
• Voltage Rating (AC): 250 V
• Response Time: Fast Blow
• Breaking Capacity @ Rated Voltage: 1.5 kA

Mechanical Parameters (Must Match):

• Fuse Type: Cartridge, Ceramic
• Package / Case: 5mm x 20mm (Axial)
• Mounting Type: Through Hole

Compliance Parameters (Must Maintain or Exceed):

• RoHS Status: Compliant or equivalent
• Approval Agencies: Recognized certifications

The substitute part 0216.250MXEP (Littelfuse Inc.) satisfies all critical electrical and mechanical parameters, enabling direct substitution in applications where the BK/S501-V-250-R is specified or where equivalent performance is required.

Parameter Comparison

Engineering Selection Recommendations

Primary Part: BK/S501-V-250-R

Use the BK/S501-V-250-R when:

• Original equipment manufacturer (OEM) specifications explicitly require Eaton components
• Design validation has been completed with this specific part number
• Supply chain preference favors Eaton - Electronics Division
• Current inventory (929 units) meets project timeline requirements
• Certifications from BSI, cULus, or IMQ are specifically required

Substitute Part: 0216.250MXEP

Use the 0216.250MXEP (Littelfuse Inc.) when:

• Electrical and mechanical equivalence is acceptable per design specifications
• Supply chain requires alternative sourcing from Littelfuse Inc.
• Higher inventory availability (5591 units) supports project scheduling
• Operating temperature range (-55°C ~ 125°C) is required
• Certifications from CCC, CE, CSA, SEMKO, UR, or VDE satisfy compliance requirements
• ROHS3 compliance status meets regulatory requirements

Compatibility Considerations:

Both parts are certified to the same breaking capacity (1.5 kA) and share overlapping approval agencies (CCC, CSA, SEMKO, VDE). The dimensional variation (0.218" vs 0.236" diameter; 0.831" vs 0.886" length) is within typical fuse holder tolerances for 5mm x 20mm cartridge fuses. The difference in DC cold resistance (4.4 Ohms vs 2.35 Ohms) and melting I²t values reflects different ceramic formulations but does not affect fast-blow response characteristics at rated current.

Frequently Asked Questions (FAQ)

Q: Can 0216.250MXEP be used as a direct replacement for BK/S501-V-250-R?

A: Yes. Both parts share identical electrical ratings (250 mA, 250 V AC/DC), response time (fast blow), breaking capacity (1.5 kA), and package specifications (5mm x 20mm cartridge, through-hole mounting). The parts are mechanically and electrically interchangeable for circuit protection applications.

Q: What is the significance of the dimensional differences between these parts?

A: The BK/S501-V-250-R measures 0.218" diameter x 0.831" length, while the 0216.250MXEP measures 0.236" diameter x 0.886" length. These variations fall within standard tolerances for 5mm x 20mm cartridge fuses and do not affect compatibility with standard fuse holders designed for this package size.

Q: How do the DC cold resistance values differ, and does this affect substitution?

A: The BK/S501-V-250-R has 4.4 Ohms DC cold resistance, while the 0216.250MXEP has 2.35 Ohms. This difference reflects different ceramic materials but does not affect fast-blow response at rated current (250 mA) or circuit protection performance. Both values are within acceptable ranges for ceramic cartridge fuses in this current class.

Q: What is the difference in melting I²t values?

A: The BK/S501-V-250-R has a melting I²t of 0.027, while the 0216.250MXEP has 0.00891. The I²t value characterizes thermal energy required to melt the fuse element. The lower value in the Littelfuse part indicates faster thermal response, which is consistent with fast-blow fuse design. Both parts meet the 250 mA fast-blow specification.

Q: Are there approval agency differences that affect substitution?

A: Both parts carry overlapping certifications (CCC, CSA, SEMKO, VDE). The BK/S501-V-250-R includes BSI, cULus, and IMQ certifications, while the 0216.250MXEP includes CE and UR certifications. For applications requiring specific approval agencies, verify that the substitute part carries the required certifications.

Q: What is the operating temperature range for each part?

A: The BK/S501-V-250-R does not specify an operating temperature range in the provided data. The 0216.250MXEP operates from -55°C to 125°C. For applications requiring operation outside standard ambient conditions, the Littelfuse part provides documented temperature performance.

Q: How do RoHS compliance statuses compare?

A: The BK/S501-V-250-R is RoHS Compliant. The 0216.250MXEP is ROHS3 Compliant, which represents the current RoHS directive revision. Both parts meet RoHS requirements; ROHS3 indicates compliance with the most recent regulatory standard.

Q: Which part should be selected for new designs?

A: For new designs, either part is acceptable based on electrical and mechanical equivalence. Selection should be based on supply chain strategy, inventory availability, required certifications, and operating environment specifications. The 0216.250MXEP offers higher inventory availability (5591 units vs 929 units) and documented operating temperature range.