Littelfuse 0312.031V Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0312.031V is a 31 mA, 250 V AC/DC fast-blow glass cartridge fuse designed for 3AB and 3AG holder applications. This fuse is classified as obsolete, making identification of active equivalent parts essential for ongoing system maintenance and component procurement. Substitute parts must maintain identical electrical ratings, mechanical dimensions, and holder compatibility to ensure proper circuit protection without modification to existing installations.

Substiute Parts

0312.031V

Littelfuse Inc.In Stock: 10360312.031V Datasheet

Current PartRFQ

AGC-1/32

Eaton - Electronics DivisionIn Stock: 770AGC-1/32 Datasheet

Parametric EquivalentRFQ

BK/AGC-1/32

Eaton - Electronics DivisionIn Stock: 1030BK/AGC-1/32 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the Littelfuse 0312.031V are qualified based on the following mandatory parameters:

• Current Rating: 31 mA (exact match required)
• Voltage Rating - AC: 250 V (exact match required)
• Response Time: Fast Blow (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
• Mounting Type: Requires Holder (exact match required)
• Operating Temperature Range: -55°C to 125°C (exact match required)

The Eaton AGC-1/32 and BK/AGC-1/32 fuses meet all substitution criteria. Both are active products with identical current ratings, voltage specifications, response characteristics, physical dimensions, and temperature operating ranges. These parts are direct replacements for the obsolete Littelfuse 0312.031V in applications requiring 31 mA protection at 250 V AC.

Parameter Comparison

Engineering Selection Recommendations

Both Eaton substitute parts are active products with full electrical and mechanical compatibility to the obsolete Littelfuse 0312.031V. The Eaton AGC-1/32 carries CSA and UL approvals matching the original part's certification profile. The Eaton BK/AGC-1/32 is also an active product with identical electrical and mechanical specifications, though approval agency information is not provided in the available data.

For applications requiring documented compliance with CSA and UL standards, the Eaton AGC-1/32 is the preferred substitute. Both parts are suitable for direct replacement in existing 3AB and 3AG holder installations without circuit modification.

Frequently Asked Questions (FAQ)

Q: Can the Eaton AGC-1/32 and BK/AGC-1/32 be used interchangeably with the Littelfuse 0312.031V?

A: Yes. Both Eaton parts meet all substitution criteria: identical 31 mA current rating, 250 V AC voltage rating, fast-blow response time, glass cartridge construction, 3AB/3AG package compatibility, and -55°C to 125°C operating temperature range.

Q: What is the difference between AGC-1/32 and BK/AGC-1/32?

A: Both parts share identical electrical ratings and physical dimensions. The AGC-1/32 carries CSA and UL approvals. The BK/AGC-1/32 designation indicates a variant within the AGC series. Selection depends on specific approval requirements for your application.

Q: Will these substitute fuses fit existing 3AB and 3AG holders?

A: Yes. All three fuses share the same physical dimensions of 0.250" diameter by 1.250" length (6.35mm x 31.75mm) and are designed for 3AB and 3AG holder applications.

Q: Are there any temperature operating differences between the original and substitute parts?

A: No. All three fuses operate across the identical temperature range of -55°C to 125°C.

Q: What is the breaking capacity of these substitute fuses?

A: The Littelfuse 0312.031V has a specified breaking capacity of 35 A at rated voltage. Breaking capacity data for the Eaton substitutes is not provided in the available specifications.