SCHURTER 2040.0709 Equivalent & Substitute Parts

Part Overview

The SCHURTER 2040.0709 is a 250 mA, 250 V AC board mount fuse with radial, can, vertical package configuration. This part operates within the MSU 250 series and is classified as obsolete. Due to its obsolete status, identifying equivalent and substitute parts from the active product portfolio is necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Substiute Parts

2040.0709

SCHURTER Inc.In Stock: 10622040.0709 Datasheet

Current PartRFQ

0034.6709

SCHURTER Inc.In Stock: 10880034.6709 Datasheet

DirectRFQ

0034.7209

SCHURTER Inc.In Stock: 8060034.7209 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SCHURTER 2040.0709 is determined by the following critical parameters:

• Current Rating: 250 mA (exact match required)
• Voltage Rating - AC: 250 V (exact match required)
• Response Time: Slow Blow (exact match required)
• Mounting Type: Through Hole (exact match required)
• Package / Case: Radial, Can, Vertical (exact match required)
• Size / Dimension: 0.335" Dia x 0.335" H (8.50mm x 8.50mm) (exact match required)

The substitute parts listed below meet all critical electrical and mechanical parameters. Variations in breaking capacity, melting I²t, operating temperature range, and approval agencies are permissible within the scope of board mount fuse substitution, provided the core functional parameters remain identical.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts are active products from SCHURTER Inc. and provide direct functional equivalence to the obsolete 2040.0709.

SCHURTER 0034.6709 is recommended for applications requiring dual voltage operation (250 V AC and 125 V DC). This part extends the operating temperature range to -55°C ~ 125°C and includes additional approval certifications (KC). The breaking capacity is rated at 35A AC and 50A DC, with identical melting I²t of 0.6 to the main part.

SCHURTER 0034.7209 is recommended for applications operating exclusively at 250 V AC within the -40°C ~ 85°C temperature range. This part features an increased breaking capacity of 50A and a lower melting I²t of 0.258, providing faster response characteristics. Certification is limited to cULus.

Selection between these substitutes depends on voltage requirements, temperature operating conditions, and required approval certifications for the target application.

Frequently Asked Questions (FAQ)

Q: Can SCHURTER 0034.6709 be used as a direct replacement for 2040.0709 in all applications?

A: Yes, provided the application does not require the specific approval certifications (CCC, cURus, VDE) of the original part. The 0034.6709 maintains identical current rating, AC voltage rating, response time, and physical dimensions. The extended operating temperature range and dual voltage capability provide additional flexibility.

Q: What is the difference between 0034.6709 and 0034.7209?

A: The primary differences are voltage rating and melting I²t. The 0034.6709 supports both 250 V AC and 125 V DC operation with melting I²t of 0.6, while the 0034.7209 operates at 250 V AC only with melting I²t of 0.258. The 0034.7209 has a higher breaking capacity (50A) and faster response time due to lower I²t.

Q: Are the physical dimensions identical across all three parts?

A: Yes. All three parts share the same radial, can, vertical package configuration with dimensions of 0.335" Dia x 0.335" H (8.50mm x 8.50mm), ensuring mechanical compatibility on existing PCB layouts.

Q: Which substitute should be selected for new designs?

A: For new designs, either active substitute is acceptable. Selection should be based on the specific voltage requirements (AC only versus AC/DC), operating temperature range, and required approval certifications for the target market or application standard.

Q: Is the melting I²t difference between substitutes significant?

A: The melting I²t value affects the thermal response of the fuse. The 0034.7209 with I²t of 0.258 responds faster to overcurrent conditions compared to the 0034.6709 and original 2040.0709 with I²t of 0.6. Selection depends on circuit protection requirements and coordination with other protective devices.