Littelfuse 03121.75VXP Equivalent & Substitute Parts

Part Overview

The Littelfuse 03121.75VXP is a 1.75 A, 250 V AC/DC fast-blow glass cartridge fuse designed for applications requiring reliable overcurrent protection in holder-based installations. This component belongs to the 312 series and is classified as Active product status. Substitute parts are identified when equivalent electrical and mechanical parameters align with the original specification, ensuring functional compatibility in circuit protection applications.

Substiute Parts

03121.75VXP

Littelfuse Inc.In Stock: 89503121.75VXP Datasheet

Current PartRFQ

BK/AGC-1-3/4-R

Eaton - Electronics DivisionIn Stock: 1094BK/AGC-1-3/4-R Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the Littelfuse 03121.75VXP are identified based on strict equivalence of the following critical parameters:

• Current Rating: 1.75 A
• Voltage Rating (AC): 250 V
• Fuse Type: Cartridge, Glass
• Response Time: Fast Blow
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4"
• Size / Dimension: 0.250" Dia x 1.250" L (6.35mm x 31.75mm)
• Operating Temperature Range: -55°C ~ 125°C
• Mounting Type: Requires Holder

The Eaton BK/AGC-1-3/4-R meets all specified electrical and mechanical parameters, confirming functional interchangeability in holder-based circuit protection applications.

Parameter Comparison

Engineering Selection Recommendations

Both the Littelfuse 03121.75VXP and Eaton BK/AGC-1-3/4-R maintain Active product status and comply with ROHS3 and REACH requirements. Both components carry identical ECCN and HTSUS classifications. Selection between these parts may be based on inventory availability, supply chain considerations, or established procurement preferences, as electrical and mechanical specifications are equivalent.

Frequently Asked Questions (FAQ)

Q: Can the Eaton BK/AGC-1-3/4-R be used as a direct replacement for the Littelfuse 03121.75VXP?

A: Yes. Both components share identical current rating (1.75 A), voltage rating (250 V AC), fuse type (cartridge, glass), response time (fast blow), package designation (3AB, 3AG), physical dimensions (0.250" Dia x 1.250" L), and operating temperature range (-55°C ~ 125°C). They are mechanically and electrically interchangeable in holder-based applications.

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

A: Both parts are ROHS3 compliant and REACH unaffected. Both carry EAR99 ECCN classification and identical HTSUS codes (8536.10.0020). No compliance or certification differences exist.

Q: What holder types are compatible with these fuses?

A: Both fuses require a holder and are designated for 3AB and 3AG package types with 1/4" x 1-1/4" dimensions. Ensure the holder matches these specifications.

Q: Do these fuses have different breaking capacities?

A: The Littelfuse 03121.75VXP specifies a breaking capacity of 100 A at rated voltage. The Eaton BK/AGC-1-3/4-R does not provide a breaking capacity specification in the available data.

Q: What is the difference between the 312 series and AGC series designations?

A: The series designation identifies the manufacturer's product line. The Littelfuse 03121.75VXP belongs to the 312 series, while the Eaton BK/AGC-1-3/4-R belongs to the AGC series. Both series produce functionally equivalent 1.75 A, 250 V fast-blow glass cartridge fuses.