BK/S501-250-R Equivalent & Substitute Parts

Part Overview

The BK/S501-250-R is a ceramic cartridge fuse rated at 250 mA, 250 V AC/DC with fast-blow response characteristics. Manufactured by Eaton Electronics Division, this component is designed for overcurrent protection in electrical circuits requiring a 5mm x 20mm form factor. The fuse is active in production status and widely stocked. Substitute parts are identified to provide alternative sourcing options when the primary part number is unavailable or when design flexibility permits cross-platform component selection.

Substiute Parts

BK/S501-250-R

Eaton - Electronics DivisionIn Stock: 1087BK/S501-250-R Datasheet

Current PartRFQ

BK/GDA-250MA

Eaton - Electronics DivisionIn Stock: 866BK/GDA-250MA Datasheet

Parametric EquivalentRFQ

S501-250-R

Eaton - Electronics DivisionIn Stock: 789S501-250-R Datasheet

Parametric EquivalentRFQ

0216.250HXP

Littelfuse Inc.In Stock: 11760216.250HXP Datasheet

DirectRFQ

0216.250MXP

Littelfuse Inc.In Stock: 21620216.250MXP Datasheet

DirectRFQ

FCD-250MA

OptiFuseIn Stock: 6811FCD-250MA Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the BK/S501-250-R is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Current Rating: 250 mA
• Voltage Rating (AC): 250 V
• Fuse Type: Cartridge, Ceramic
• Package / Case: 5mm x 20mm
• Response Time: Fast Blow
• Breaking Capacity @ Rated Voltage: 1.5 kA
• Mounting Type: Requires Holder

All identified substitute parts meet these requirements. Variations in secondary parameters such as melting I²t, DC cold resistance, and operating temperature range do not preclude substitution when the mandatory parameters align. Approval agency certifications differ across manufacturers but remain valid within their respective regulatory frameworks.

Parameter Comparison

Engineering Selection Recommendations

Eaton Electronics Division Parts (BK/S501-250-R, BK/GDA-250MA, S501-250-R): These parts share identical electrical and mechanical specifications. BK/S501-250-R and S501-250-R both carry BSI, CCC, CSA, cULus, IMQ, SEMKO, and VDE certifications. BK/GDA-250MA carries CCC, CSA, IMQ, SEMKO, and UL certifications. Selection among Eaton variants depends on certification requirements for the target application and regional compliance mandates.

Littelfuse Parts (0216.250HXP, 0216.250MXP): Both Littelfuse variants meet all mandatory electrical and mechanical parameters. These parts feature a defined operating temperature range of -55°C to 125°C and lower DC cold resistance (2.35 Ohms versus 4.4 Ohms for Eaton parts). Littelfuse certifications include CCC, CE, CSA, SEMKO, UR, and VDE. Selection is appropriate when extended temperature operation or lower resistance characteristics are required.

OptiFuse Part (FCD-250MA): The FCD-250MA meets all mandatory parameters and explicitly specifies 250 V DC voltage rating. This part carries IEC 60127 certification and features the lowest melting I²t value (0.004). Selection is appropriate for applications requiring explicit DC voltage rating confirmation or IEC 60127 compliance.

Inventory Availability: FCD-250MA (6,768 pcs), 0216.250MXP (2,076 pcs), and 0216.250HXP (1,155 pcs) offer the highest stock levels. BK/S501-250-R (1,036 pcs) and BK/GDA-250MA (756 pcs) provide secondary sourcing options.

Frequently Asked Questions (FAQ)

Q: Can BK/S501-250-R be directly replaced with BK/GDA-250MA? A: Yes. Both parts are manufactured by Eaton and share identical current rating (250 mA), voltage rating (250 V AC), fuse type (ceramic cartridge), package (5mm x 20mm), response time (fast blow), and breaking capacity (1.5 kA). The primary difference is the series designation and approval agency certifications. Verify that the target application accepts the certification set provided by BK/GDA-250MA.

Q: What is the difference between Eaton and Littelfuse variants? A: Eaton parts (BK/S501-250-R, BK/GDA-250MA, S501-250-R) and Littelfuse parts (0216.250HXP, 0216.250MXP) are electrically and mechanically equivalent. Littelfuse variants specify an operating temperature range (-55°C to 125°C) and feature lower DC cold resistance (2.35 Ohms). Eaton parts do not specify operating temperature. Certification bodies differ between manufacturers. Selection depends on application temperature requirements and regional compliance mandates.

Q: Is FCD-250MA compatible with applications designed for BK/S501-250-R? A: Yes. FCD-250MA meets all mandatory electrical and mechanical parameters. The part explicitly specifies 250 V DC rating, whereas the BK/S501-250-R does not specify DC voltage. FCD-250MA carries IEC 60127 certification. Verify that the application accepts OptiFuse as a manufacturer and IEC 60127 as the primary certification standard.

Q: What does "Requires Holder" mean for mounting type? A: All identified substitute parts are cartridge fuses that require a separate fuse holder for installation. The fuse itself is not self-contained and must be inserted into a compatible 5mm x 20mm fuse holder. Ensure the target circuit includes an appropriate fuse holder rated for 250 V AC and 250 mA minimum breaking capacity.

Q: Can these fuses be used in DC applications? A: FCD-250MA explicitly specifies 250 V DC rating. Eaton parts (BK/S501-250-R, BK/GDA-250MA, S501-250-R) specify 250 V AC without explicit DC rating. Littelfuse parts (0216.250HXP, 0216.250MXP) specify 250 V AC without explicit DC rating. For DC applications, FCD-250MA is the recommended choice based on explicit DC voltage specification.

Q: What is the significance of melting I²t values? A: Melting I²t indicates the thermal energy required to melt the fuse element. Lower values indicate faster response to overcurrent conditions. FCD-250MA (0.004) responds fastest, followed by Littelfuse variants (0.00891), and Eaton variants (0.027). Selection depends on circuit protection requirements and coordination with upstream protective devices.

Q: Are all substitute parts RoHS compliant? A: Yes. All identified substitute parts carry RoHS3 compliance status. BK/GDA-250MA carries general RoHS compliance. All other parts explicitly state ROHS3 compliance. All parts are suitable for applications requiring RoHS-compliant components.