SCHURTER 2040.0818 Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The SCHURTER 2040.0818 is a 2 A, 250 V AC board mount fuse with radial, can, vertical package configuration. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The MSU 250 series fuse is designed for through-hole mounting applications requiring slow-blow response characteristics and operates across -40°C to 85°C temperature range.

Substiute Parts

2040.0818

SCHURTER Inc.In Stock: 8272040.0818 Datasheet

Current PartRFQ

0034.6818

SCHURTER Inc.In Stock: 31670034.6818 Datasheet

DirectRFQ

0034.6978

SCHURTER Inc.In Stock: 33570034.6978 Datasheet

Parametric EquivalentRFQ

0034.7318

SCHURTER Inc.In Stock: 16220034.7318 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the obsolete 2040.0818 is determined by the following critical parameters:

• Current Rating: 2 A (fixed requirement)
• Voltage Rating - AC: 250 V (fixed requirement)
• Response Time: Slow Blow (fixed requirement)
• Mounting Type: Through Hole (fixed requirement)
• Package / Case: Radial, Can, Vertical (fixed requirement)
• Physical Dimensions: 0.335" Dia x 0.335" H (8.50mm x 8.50mm) (fixed requirement)

All three substitute parts (0034.6818, 0034.6978, 0034.7318) meet these core electrical and mechanical parameters. Variations exist in breaking capacity, melting I²t characteristics, approval agencies, and product status, which are documented in the parameter comparison table below.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts are active products from SCHURTER Inc. and maintain electrical and mechanical compatibility with the obsolete 2040.0818 across the core parameters: 2 A current rating, 250 V AC voltage rating, slow-blow response, through-hole mounting, and identical physical dimensions.

0034.6818 (MST 250 Series): This part provides the closest electrical match to the original, with identical 35 A breaking capacity and 34 melting I²t value. It adds DC voltage capability (125 V DC) and extends the operating temperature range to -55°C ~ 125°C. Approval agencies include CCC, cURus, KC, PSE/JET, and VDE, providing broader international compliance coverage.

0034.6978 (MXT 250 Series): This part offers enhanced breaking capacity (100 A) and maintains the same operating temperature range as the original (-40°C ~ 85°C). The melting I²t is reduced to 16, indicating faster thermal response. Approval agencies include CCC, cURus, KC, PSE/JET, and VDE.

0034.7318 (MSTU 250 Series): This part provides intermediate breaking capacity (50 A) with melting I²t of 28.6. Approval is limited to cULus certification. Operating temperature range matches the original (-40°C ~ 85°C).

Selection should be based on application-specific requirements for breaking capacity, thermal response characteristics, and required regulatory certifications.

Frequently Asked Questions (FAQ)

Q: Can the substitute parts be used as direct replacements for the 2040.0818?

A: Yes, all three substitute parts meet the core electrical and mechanical parameters: 2 A current rating, 250 V AC voltage rating, slow-blow response, through-hole mounting, and 8.50mm x 8.50mm physical dimensions. They are mechanically and electrically compatible for board mount applications.

Q: What is the difference between the substitute parts?

A: The substitute parts differ in breaking capacity, melting I²t characteristics, and regulatory certifications. The 0034.6818 provides the closest match to the original specifications with identical breaking capacity and melting I²t. The 0034.6978 offers higher breaking capacity (100 A), while the 0034.7318 provides intermediate breaking capacity (50 A) with cULus certification only.

Q: Does the 0034.6818 DC voltage rating affect compatibility?

A: The 0034.6818 includes a 125 V DC rating in addition to the 250 V AC rating. This addition does not affect AC-only applications and provides expanded capability for mixed AC/DC circuit designs.

Q: Are all substitute parts available in the same packaging?

A: All substitute parts are supplied in Cut Tape (CT) packaging, which differs from the original part's unspecified packaging. This is standard for active production parts and does not affect electrical or mechanical compatibility.

Q: Which substitute part should be selected for new designs?

A: Selection depends on application requirements. For applications requiring extended temperature range and DC capability, 0034.6818 is recommended. For applications requiring higher breaking capacity, 0034.6978 is suitable. For applications with cULus certification requirements only, 0034.7318 is appropriate.