Littelfuse 0230.375DRT3P Equivalent & Substitute Parts

Part Overview

The Littelfuse 0230.375DRT3P is a 375 mA, 250 V AC / 125 V DC glass cartridge fuse with slow-blow response characteristics. This through-hole component is designed for circuit protection in applications requiring reliable overcurrent interruption. The part maintains active product status with 753 units in current inventory. Substitute parts are identified when equivalent electrical performance, mechanical compatibility, and regulatory compliance can be maintained across alternative manufacturers and package configurations.

Substiute Parts

0230.375DRT3P

Littelfuse Inc.In Stock: 8040230.375DRT3P Datasheet

Current PartRFQ

BK/C515-375-R

Eaton - Electronics DivisionIn Stock: 2123BK/C515-375-R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Littelfuse 0230.375DRT3P is determined by the following critical parameters:

Electrical Equivalence Requirements:

• Current Rating: 375 mA (exact match required)
• Voltage Rating - AC: 250 V (minimum requirement)
• Response Time: Slow Blow (functional characteristic match)
• Fuse Type: Cartridge, Glass (construction type match)

Mechanical Compatibility Requirements:

• Mounting Type: Through Hole (circuit board interface)
• Package Configuration: Axial cartridge format (physical form factor)

Regulatory & Compliance Requirements:

• Approval Agencies: CSA and/or UL certification (minimum overlap with original part)
• RoHS Status: ROHS3 Compliant (environmental compliance)

The Eaton BK/C515-375-R meets these substitution criteria through equivalent current and AC voltage ratings, matching response time classification, identical fuse construction type, and compatible through-hole mounting. Both parts carry CSA and UL approvals and maintain ROHS3 compliance. Physical dimensions differ slightly (5.50mm x 15.20mm vs. 4.50mm x 14.50mm), representing a transition from non-standard to 2AG package format, which remains mechanically compatible in standard through-hole fuse holders.

Parameter Comparison

Engineering Selection Recommendations

Both the Littelfuse 0230.375DRT3P and Eaton BK/C515-375-R maintain active product status with current manufacturing support. Selection between these parts should be based on the following factors:

Littelfuse 0230.375DRT3P is the original specification component, offering the documented DC voltage rating of 125 V and CE certification in addition to CSA and UL approvals. This part is appropriate for applications requiring explicit DC performance data and multi-agency compliance documentation.

Eaton BK/C515-375-R provides equivalent AC circuit protection with identical current and voltage ratings, matching response time, and CSA/UL certification. The 2AG package format offers broader availability and standardized fuse holder compatibility. This substitute is suitable for applications where AC protection is the primary requirement and the non-standard package format of the original part creates supply or mechanical constraints.

Both parts carry ROHS3 compliance and are suitable for the specified operating temperature range. The difference in melting I²t values (0.58 vs. 1.531) reflects the distinct package geometries and should be evaluated against specific circuit protection requirements.

Frequently Asked Questions (FAQ)

Q: Can the Eaton BK/C515-375-R directly replace the Littelfuse 0230.375DRT3P in all applications?

A: The Eaton part provides equivalent AC circuit protection at 375 mA and 250 V with matching slow-blow response. However, the original Littelfuse part specifies 125 V DC rating, which is not documented for the Eaton substitute. Applications requiring explicit DC voltage performance should retain the original part specification. Physical dimensions differ slightly; verify fuse holder compatibility before substitution.

Q: What is the significance of the 2AG package designation for the Eaton part?

A: 2AG is an industry-standard cartridge fuse format (5mm x 15mm). This standardization provides broader component availability and compatibility with common fuse holder designs. The Littelfuse 0230.375DRT3P uses a non-standard axial format (4.50mm x 14.50mm), which may have more limited holder compatibility.

Q: Are there differences in breaking capacity between these parts?

A: The Littelfuse part specifies 35A AC and 10kA DC breaking capacity. The Eaton part specifies 35A breaking capacity without separate DC rating. Both meet the 35A AC requirement for equivalent AC circuit protection.

Q: Do both parts meet the same regulatory certifications?

A: Both parts carry CSA and UL certifications. The Littelfuse part additionally carries CE certification. For applications requiring CE compliance, the original part should be specified.

Q: What does the difference in melting I²t values indicate?

A: The melting I²t value (0.58 vs. 1.531) reflects the thermal mass and geometry of each fuse element. This parameter affects the time-current characteristic curve. Applications with specific inrush current or thermal protection requirements should evaluate this difference against circuit specifications.

Q: Can these parts be used interchangeably in existing inventory systems?

A: These parts have different manufacturer part numbers, package formats, and dimensional specifications. Inventory management systems should maintain separate part records. Physical verification of fuse holder compatibility is required before field substitution.