Equivalent & Substitute Parts for 0313.040MXP

Part Overview

The 0313.040MXP is a 40 mA, 250 V AC/DC glass cartridge fuse manufactured by Littelfuse Inc. as part of the 313 series. This slow-blow fuse is designed for applications requiring circuit protection in equipment operating at 250 V AC with a current rating of 40 mA. The fuse requires a standard 3AB or 3AG holder and operates across a temperature range of -55°C to 125°C. With active product status and full compliance certifications (CE, CSA, UL), this component remains in production and is suitable for new designs and maintenance applications.

Substiute Parts

0313.040MXP

Littelfuse Inc.In Stock: 8320313.040MXP Datasheet

Current PartRFQ

0313.040HXP

Littelfuse Inc.In Stock: 8410313.040HXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The 0313.040MXP has one parametric equivalent substitute: 0313.040HXP. Substitution eligibility is determined by the following critical parameters:

• Current Rating: 40 mA (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Slow Blow (exact match required)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
• Breaking Capacity @ Rated Voltage: 35 A (exact match required)
• Operating Temperature Range: -55°C to 125°C (exact match required)
• Approval Agencies: CE, CSA, UL (exact match required)

The substitute part 0313.040HXP meets all these criteria and is therefore electrically and mechanically interchangeable with the main part.

Parameter Comparison

Engineering Selection Recommendations

Both the 0313.040MXP and 0313.040HXP are active products from Littelfuse Inc. with identical electrical and mechanical specifications. Both parts carry full compliance certifications (CE, CSA, UL) and meet ROHS3 requirements. Selection between these two parts may be based on inventory availability or procurement lead times, as they are functionally equivalent for all circuit protection applications requiring a 40 mA, 250 V AC slow-blow glass cartridge fuse in a 3AB/3AG holder configuration.

Frequently Asked Questions (FAQ)

Q: Can 0313.040HXP be used as a direct replacement for 0313.040MXP?

A: Yes. Both parts are identical in all electrical and mechanical parameters, including current rating, voltage rating, response time, package configuration, and approval certifications. Direct substitution is permissible without circuit modification.

Q: What holder types are compatible with these fuses?

A: Both fuses require a 3AB or 3AG holder. The physical dimensions are 0.250" diameter by 1.250" length (6.35 mm x 31.75 mm), which conform to standard 3AB and 3AG holder specifications.

Q: Are these fuses suitable for DC applications?

A: These fuses are rated for 250 V AC. The DC cold resistance is specified at 300 Ohms. Consult application requirements and safety standards before use in DC circuits.

Q: What is the difference between the MXP and HXP designations?

A: The MXP and HXP designations represent different internal manufacturing codes within the Littelfuse 313 series. Both parts meet identical performance and compliance specifications and are electrically and mechanically interchangeable.

Q: What is the operating temperature range for these fuses?

A: Both fuses operate across a temperature range of -55°C to 125°C, suitable for industrial and commercial applications with wide environmental conditions.