Equivalent & Substitute Parts for BK-S505SC-2.5-R

Part Overview

The BK-S505SC-2.5-R is a ceramic cartridge fuse manufactured by Eaton - Electronics Division, rated at 2.5 A, 250 V AC/DC with a 5mm x 20mm axial form factor. This slow-blow fuse is designed for through-hole mounting applications requiring circuit protection in industrial and commercial equipment. The part is currently active in production with 826 pieces in stock. Substitute parts are identified when equivalent electrical and mechanical parameters are required due to supply constraints, design standardization, or component lifecycle management.

Substiute Parts

BK-S505SC-2.5-R

Eaton - Electronics DivisionIn Stock: 845BK-S505SC-2.5-R Datasheet

Current PartRFQ

021502.5MXESPP

Littelfuse Inc.In Stock: 1583021502.5MXESPP Datasheet

Parametric EquivalentRFQ

TUC UDA-P 2.5A 250V (PF)

ConquerIn Stock: 2075TUC UDA-P 2.5A 250V (PF) Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the BK-S505SC-2.5-R are qualified based on strict equivalence of the following electrical and mechanical parameters:

• Current Rating: 2.5 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)
• Physical Dimensions: 0.205" Dia x 0.787" L (exact match required)

All identified substitute parts meet these criteria and are therefore electrically and mechanically interchangeable with the main part in applications requiring a 2.5 A, 250 V AC/DC ceramic cartridge fuse in a 5mm x 20mm axial configuration.

Parameter Comparison

Engineering Selection Recommendations

All three parts—BK-S505SC-2.5-R (Eaton), 021502.5MXESPP (Littelfuse), and TUC UDA-P 2.5A 250V (PF) (Conquer)—are active products with equivalent electrical and mechanical specifications. Selection among these parts should be based on the following factors:

Compliance and Certifications: The BK-S505SC-2.5-R carries approvals from BSI, CCC/CQC, CSA, cURus, IMQ, KC, PSE/JET, SEMKO, and VDE. The 021502.5MXESPP carries approvals from CE, CQC, CSA, KC, PSE, UR, and VDE. The TUC UDA-P 2.5A 250V (PF) carries approvals from CCC, cURus, KC, PSE, and TUV. Verify that the selected part meets all regulatory requirements for the target application and geographic market.

RoHS Compliance: The BK-S505SC-2.5-R is RoHS Compliant. Both substitute parts are ROHS3 Compliant, indicating compliance with the latest RoHS directive revision.

Inventory Availability: BK-S505SC-2.5-R has 826 pieces in stock, 021502.5MXESPP has 1473 pieces in stock, and TUC UDA-P 2.5A 250V (PF) has 1967 pieces in stock.

Operating Temperature Range: The BK-S505SC-2.5-R does not specify an operating temperature range. Both 021502.5MXESPP and TUC UDA-P 2.5A 250V (PF) specify -55°C ~ 125°C operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can the 021502.5MXESPP (Littelfuse) be used as a direct replacement for the BK-S505SC-2.5-R (Eaton)?

A: Yes. Both parts are 2.5 A, 250 V AC/DC ceramic cartridge fuses with slow-blow response, 1.5 kA breaking capacity, and identical 5mm x 20mm axial form factor. They are electrically and mechanically interchangeable.

Q: Can the TUC UDA-P 2.5A 250V (PF) (Conquer) be used as a direct replacement for the BK-S505SC-2.5-R (Eaton)?

A: Yes. Both parts are 2.5 A, 250 V AC/DC ceramic cartridge fuses with slow-blow response, 1.5 kA breaking capacity, and identical 5mm x 20mm axial form factor. They are electrically and mechanically interchangeable.

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

A: The melting I²t values are 16.6 (BK-S505SC-2.5-R), 22.29 (021502.5MXESPP), and 24.75 (TUC UDA-P 2.5A 250V (PF)). These values represent the thermal energy required to melt the fuse element. All parts are rated for the same current and voltage, and the differences in I²t fall within the acceptable range for slow-blow ceramic fuses of this specification.

Q: Are there any differences in regulatory approvals among these parts?

A: Yes. Each manufacturer carries different approval agency certifications. Verify that the selected part carries all certifications required for your specific application and target market before implementation.

Q: What is the DC cold resistance specification, and why does it vary among these parts?

A: DC cold resistance is the resistance of the fuse element at room temperature when no current is flowing. The values are 0.0395 Ohms (BK-S505SC-2.5-R), 0.0386 Ohms (021502.5MXESPP), and 0.0385 Ohms (TUC UDA-P 2.5A 250V (PF)). These minor variations are within acceptable tolerances for ceramic cartridge fuses and do not affect interchangeability.

Q: Are all three parts RoHS compliant?

A: Yes. The BK-S505SC-2.5-R is RoHS Compliant. Both 021502.5MXESPP and TUC UDA-P 2.5A 250V (PF) are ROHS3 Compliant, indicating compliance with the current RoHS directive.