Equivalent & Substitute Parts for Eaton BK/SFE-4 Glass Cartridge Fuse

Part Overview

The Eaton BK/SFE-4 is a fast-blow glass cartridge fuse rated at 4 A, 32 V DC, housed in a 1AG form factor (1/4" x 5/8"). This component is designed for circuit protection in low-voltage DC applications and requires a compatible fuse holder for installation. The part maintains Active product status with UL approval certification. Substitute parts are identified based on matching electrical ratings, mechanical dimensions, and functional characteristics to ensure direct interchangeability in existing circuit designs.

Substiute Parts

BK/SFE-4

Eaton - Electronics DivisionIn Stock: 864BK/SFE-4 Datasheet

Current PartRFQ

SFE-4

Eaton - Electronics DivisionIn Stock: 1176SFE-4 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Eaton BK/SFE-4 is determined by strict equivalence across the following parameters:

• Current Rating: Must be exactly 4 A
• Voltage Rating (DC): Must be exactly 32 V
• Fuse Type: Must be Cartridge, Glass construction
• Response Time: Must be Fast Blow characteristic
• Package / Case: Must be 1AG form factor, 1/4" x 5/8" dimensions
• Physical Dimensions: Must match 0.250" Dia x 0.626" L (6.35mm x 15.90mm)
• Mounting Type: Must require holder installation
• Approval Agency: Must carry UL certification

Only parts meeting all these criteria are classified as parametric equivalents and direct substitutes.

Parameter Comparison

Engineering Selection Recommendations

The SFE-4 substitute part is a direct parametric equivalent to the BK/SFE-4. Both components are manufactured by Eaton - Electronics Division, carry identical electrical and mechanical specifications, and maintain Active product status with UL certification. Selection between these parts may be based on inventory availability and packaging preferences. The main part (BK/SFE-4) has 811 pieces in stock, while the substitute (SFE-4) has 1097 pieces available. Both parts are RoHS non-compliant and REACH Unaffected, with identical ECCN (EAR99) and HTSUS (8536.10.0020) classifications.

Frequently Asked Questions (FAQ)

Q: Can the SFE-4 be used as a direct replacement for the BK/SFE-4?

A: Yes. The SFE-4 is a parametric equivalent with identical current rating (4 A), voltage rating (32 V DC), fuse type (Cartridge, Glass), response time (Fast Blow), package form factor (1AG, 1/4" x 5/8"), and physical dimensions (0.250" Dia x 0.626" L). Both parts carry UL approval and require a compatible fuse holder for installation.

Q: What determines if a fuse can substitute for the BK/SFE-4?

A: A substitute fuse must match all of the following: 4 A current rating, 32 V DC voltage rating, glass cartridge construction, fast-blow response characteristic, 1AG package form factor, and 1/4" x 5/8" physical dimensions. Deviations in any parameter disqualify the part as a direct substitute.

Q: Are there any compliance or certification differences between these parts?

A: No. Both the BK/SFE-4 and SFE-4 carry identical UL certification, ECCN classification (EAR99), and HTSUS code (8536.10.0020). Both are RoHS non-compliant and REACH Unaffected.

Q: What is the difference between the BK/SFE-4 and SFE-4 part numbers?

A: The part numbers reflect different packaging or distribution configurations from Eaton - Electronics Division. The electrical and mechanical specifications are identical, making them interchangeable in circuit applications.

Q: Does the fuse holder compatibility differ between these parts?

A: No. Both parts require a compatible 1AG fuse holder. The identical 1/4" x 5/8" dimensions ensure mechanical compatibility with the same holder designs.