Eaton BK/HMR Fuse Holder Cartridge 250V 30A Panel Mount - Equivalent & Substitute Parts

Part Overview

The Eaton BK/HMR is a cartridge fuse holder designed for panel mount applications, rated at 30 amperes and 250 volts. This single-circuit holder accommodates 0.25" diameter by 1.26" length cartridge fuses (6.35mm x 32mm), commonly referenced as 3AG or 1/4" x 1-1/4" (SFE-20) fuse types. The component features solder lug termination and is classified as an active product with 683 units currently in stock. Identification of equivalent substitute parts becomes necessary when primary inventory is depleted, when supply chain constraints occur, or when design flexibility permits selection from multiple qualified manufacturers meeting identical electrical and mechanical specifications.

Substiute Parts

BK/HMR

Eaton - Electronics DivisionIn Stock: 771BK/HMR Datasheet

Current PartRFQ

03400312Z

Littelfuse Inc.In Stock: 103303400312Z Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Eaton BK/HMR fuse holder is determined by strict alignment of the following critical parameters:

Mandatory Matching Parameters:

• Mounting Type: Panel Mount
• Fuse Size: 0.25" Dia x 1.26" L (6.35mm x 32mm)
• Voltage Rating: 250V
• Number of Circuits: 1
• Fuse Type: Cartridge
• Termination Style: Solder Lug
• Compatible Fuse Reference: 3AG, 1/4" x 1-1/4" (SFE-20)

Current Rating Consideration: The Littelfuse 03400312Z substitute part is rated at 20 amperes, which differs from the primary part's 30-ampere rating. This substitute is classified as a functional equivalent within the same product category and mechanical envelope, sharing all other electrical and mechanical specifications. The 20-ampere rating represents a lower current capacity within the same fuse holder form factor and voltage class.

Parameter Comparison

Engineering Selection Recommendations

Primary Part Selection: The Eaton BK/HMR remains the specified component for applications requiring a 30-ampere cartridge fuse holder rated at 250 volts with panel mount configuration and solder lug termination. This part is active and maintains adequate inventory levels.

Compliance Considerations: The Littelfuse 03400312Z substitute achieves ROHS3 compliance and REACH unaffected status, whereas the Eaton BK/HMR is classified as RoHS non-compliant. Selection between these parts must account for regulatory requirements applicable to the end application and target market.

Current Rating Differential: The Littelfuse 03400312Z operates at a 20-ampere rating compared to the Eaton part's 30-ampere rating. This difference reflects distinct design specifications and must be evaluated against circuit protection requirements. Both parts accommodate identical fuse types and physical dimensions, ensuring mechanical interchangeability within the panel mount envelope.

Inventory and Availability: The Littelfuse substitute maintains higher inventory availability at 1008 units compared to 683 units for the Eaton part, supporting supply chain flexibility when extended lead times or allocation constraints affect primary sourcing.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 03400312Z directly replace the Eaton BK/HMR in existing designs?

A: Both parts share identical mechanical dimensions (0.25" Dia x 1.26" L), voltage rating (250V), fuse type (cartridge), termination style (solder lug), and panel mount configuration. The primary difference is the current rating: 20 amperes versus 30 amperes. Direct substitution is mechanically feasible; however, the lower current rating of the Littelfuse part must be evaluated against circuit protection specifications.

Q: What fuse types are compatible with both holders?

A: Both the Eaton BK/HMR and Littelfuse 03400312Z accommodate 3AG cartridge fuses with dimensions 1/4" x 1-1/4" (SFE-20 reference standard), matching the 0.25" diameter by 1.26" length specification.

Q: Are there differences in regulatory compliance between these parts?

A: The Littelfuse 03400312Z is ROHS3 compliant and REACH unaffected. The Eaton BK/HMR is classified as RoHS non-compliant. Applications subject to RoHS or REACH regulations must select the Littelfuse part accordingly.

Q: What is the significance of the contact material and finish specifications?

A: The Littelfuse 03400312Z specifies copper alloy contacts with tin finish, providing defined electrical and corrosion resistance characteristics. The Eaton BK/HMR does not provide contact material or finish specifications in available documentation. Contact material and finish affect long-term reliability in specific environmental conditions.

Q: How do the current ratings affect circuit protection design?

A: The 30-ampere Eaton BK/HMR and 20-ampere Littelfuse 03400312Z represent different protection thresholds. Selection must align with the maximum circuit current and protection requirements. These are distinct product specifications, not interchangeable ratings.

Q: Are both parts suitable for solder lug termination in PCB or panel applications?

A: Both parts feature solder lug termination, enabling direct soldering to printed circuit boards or panel-mounted electrical connections. Mechanical and electrical compatibility is established for this termination method.