BK/SFE-7-1/2 Equivalent & Substitute Parts

Part Overview

The BK/SFE-7-1/2 is a 7.5 A fast-blow glass cartridge fuse rated for 32 V DC operation, manufactured by Eaton - Electronics Division under the SFE series. This component requires a dedicated fuse holder for installation and is classified as a cartridge-type fuse with a 7AG package format (1/4" x 7/8" dimensions). The part maintains active product status with 693 units currently in stock. Substitute parts are identified when equivalent electrical ratings, mechanical dimensions, fuse type, and response characteristics align with the original specification, enabling direct functional replacement in circuit protection applications.

Substiute Parts

BK/SFE-7-1/2

Eaton - Electronics DivisionIn Stock: 757BK/SFE-7-1/2 Datasheet

Current PartRFQ

SFE-7-1/2

Eaton - Electronics DivisionIn Stock: 1010SFE-7-1/2 Datasheet

Parametric EquivalentRFQ

FSW-7.5A

OptiFuseIn Stock: 3433FSW-7.5A Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the BK/SFE-7-1/2 are qualified based on strict equivalence across the following critical parameters:

Electrical Equivalence:

• Current Rating: 7.5 A (exact match required)
• Voltage Rating - DC: 32 V (exact match required)
• Response Time: Fast Blow (exact match required)

Mechanical Equivalence:

• Package / Case: 7AG, 1/4" x 7/8" (exact match required)
• Size / Dimension: 0.250" Dia x 0.874" L (exact match required)
• Mounting Type: Requires Holder (exact match required)

Functional Equivalence:

• Fuse Type: Cartridge, Glass (exact match required)

Compliance:

• Approval Agency: UL certification required

All identified substitutes meet these criteria and are therefore suitable for direct replacement in applications requiring the BK/SFE-7-1/2 specification.

Parameter Comparison

Engineering Selection Recommendations

BK/SFE-7-1/2 (Eaton - Electronics Division): This is the primary part specification. It maintains active product status and carries UL approval. The part is RoHS non-compliant. Selection is appropriate for applications where Eaton SFE series continuity is required or where existing inventory supports procurement strategy.

SFE-7-1/2 (Eaton - Electronics Division): This part is electrically and mechanically identical to the BK/SFE-7-1/2, differing only in manufacturer part number designation. Both are produced by Eaton under the SFE series with identical specifications and UL approval. This variant offers higher inventory availability (993 units) and is suitable for direct substitution. RoHS non-compliance status matches the primary part.

FSW-7.5A (OptiFuse): This part meets all critical electrical and mechanical equivalence criteria: 7.5 A current rating, 32 V DC voltage rating, fast-blow response, 7AG package format, and identical physical dimensions. The FSW-7.5A carries UL 248 certification and provides additional AC voltage rating (32 V AC) not specified in the primary part. Notably, this substitute offers ROHS3 compliance and a higher breaking capacity specification (1kA). Inventory availability is significantly higher (3382 units). Selection is appropriate for applications where RoHS compliance is required or where OptiFuse supply chain integration is preferred.

All three parts are suitable for direct functional replacement based on provided specifications and certifications.

Frequently Asked Questions (FAQ)

Q: Can the SFE-7-1/2 be used as a direct replacement for the BK/SFE-7-1/2?

A: Yes. Both parts are manufactured by Eaton under the SFE series with identical electrical ratings (7.5 A, 32 V DC), response characteristics (fast-blow), mechanical dimensions (7AG, 1/4" x 7/8"), and UL approval. The difference is in part number designation only. Direct substitution is supported.

Q: Is the FSW-7.5A from OptiFuse compatible with applications designed for the BK/SFE-7-1/2?

A: Yes. The FSW-7.5A meets all critical equivalence parameters: 7.5 A current rating, 32 V DC voltage rating, fast-blow response, 7AG package format, and identical physical dimensions (0.250" Dia x 0.874" L). Both parts require a fuse holder and carry UL certification. Direct substitution is supported.

Q: What is the difference between the BK/SFE-7-1/2 and FSW-7.5A?

A: The primary differences are manufacturer (Eaton vs. OptiFuse), series designation (SFE vs. FSW), and compliance status. The FSW-7.5A offers ROHS3 compliance compared to RoHS non-compliance of the BK/SFE-7-1/2. The FSW-7.5A also specifies a breaking capacity of 1kA and includes AC voltage rating (32 V AC). All electrical and mechanical parameters required for circuit protection are equivalent.

Q: Do all three parts require the same fuse holder?

A: Yes. All three parts use the 7AG package format with identical dimensions (1/4" x 7/8" or 6.35mm x 22.20mm) and require a dedicated fuse holder for installation. Existing holders compatible with the BK/SFE-7-1/2 are compatible with both substitute parts.

Q: Which substitute part should be selected for new designs?

A: Selection depends on specific application requirements. For RoHS compliance requirements, the FSW-7.5A (OptiFuse) is appropriate. For Eaton supply chain continuity, the SFE-7-1/2 is appropriate. All three parts meet the core electrical and mechanical specifications for 7.5 A, 32 V DC fast-blow cartridge fuse applications.

Q: Are there any voltage or current rating differences between these parts?

A: No. All three parts are rated for 7.5 A current and 32 V DC. The FSW-7.5A additionally specifies 32 V AC rating, which is not stated for the Eaton parts but does not affect DC-only applications.