SCHURTER 2040.0614 Equivalent & Substitute Parts

Part Overview

The SCHURTER 2040.0614 is an 800 mA, 250 V AC board mount radial fuse with slow blow response characteristics, designed for through-hole mounting in radial, can, vertical configuration. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The MSU 250 series fuse provides protection in applications requiring 800 mA current limiting at 250 V AC with a breaking capacity of 35 A at rated voltage.

Key Parameters

Parameter	Value
Manufacturer Part Number	2040.0614
Manufacturer	SCHURTER Inc.
Current Rating	800 mA
Voltage Rating - AC	250 V
Response Time	Slow Blow
Mounting Type	Through Hole
Package / Case	Radial, Can, Vertical
Size / Dimension	0.335" Dia x 0.335" H (8.50mm x 8.50mm)
Breaking Capacity @ Rated Voltage	35 A
Melting I²t	8
Operating Temperature	-40°C ~ 85°C
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 2040.0614 are grouped based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

Current Rating: 800 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)

Secondary Considerations:

Breaking Capacity @ Rated Voltage (may vary within acceptable range)
Melting I²t (may vary based on series design)
Operating Temperature range (must encompass or match application requirements)
Approval Agency certifications (must include required regulatory compliance)

Substitutes are classified into two categories:

Direct Manufacturer Substitutes (SCHURTER Inc.): Parts meeting all primary criteria with active product status, ensuring design continuity within the same manufacturer ecosystem.

Parametric Equivalents (SCHURTER Inc.): Parts meeting all primary criteria with variations in breaking capacity and melting I²t, representing different series designs with active product status.

Similar Parts (Cross-Manufacturer): Parts from alternative manufacturers meeting primary electrical and mechanical criteria, with voltage or dimensional variations that may require application review.

Parameter Comparison

Parameter	2040.0614 (Main)	0034.6614	0034.6914	0034.6944	0034.7114	0034.7214	38508000440
Manufacturer	SCHURTER Inc.	SCHURTER Inc.	SCHURTER Inc.	SCHURTER Inc.	SCHURTER Inc.	SCHURTER Inc.	Littelfuse Inc.
Current Rating (Amps)	800 mA	800 mA	800 mA	800 mA	800 mA	800 mA	800 mA
Voltage Rating - AC	250 V	250 V	250 V	250 V	250 V	250 V	125 V
Voltage Rating - DC	—	125 V	—	—	—	—	—
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow Blow	Slow Blow	Slow Blow	Slow Blow
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Can, Vertical	Radial, Can, Vertical	Radial, Can, Vertical	Radial, Can, Vertical	Radial, Can, Vertical	Radial, Can, Vertical	Radial, Box
Size / Dimension	0.335" Dia x 0.335" H (8.50mm x 8.50mm)	0.335" Dia x 0.335" H (8.50mm x 8.50mm)	0.335" Dia x 0.335" H (8.50mm x 8.50mm)	0.335" Dia x 0.335" H (8.50mm x 8.50mm)	0.335" Dia x 0.335" H (8.50mm x 8.50mm)	0.335" Dia x 0.335" H (8.50mm x 8.50mm)	0.335" L x 0.157" W x 0.315" H (8.50mm x 4.00mm x 8.00mm)
Breaking Capacity @ Rated Voltage	35 A	35 A AC, 50 A DC	100 A	100 A	50 A	50 A	50 A
Melting I²t	8	8	1.5	1.5	4.05	4.05	2.7
Operating Temperature	-40°C ~ 85°C	-55°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Series	MSU 250	MST 250	MXT 250	MXT 250	MSTU 250	MSTU 250	TE5® 385
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

SCHURTER 0034.6614 (Direct Manufacturer Substitute): This part is the primary recommended substitute for the obsolete 2040.0614. It maintains identical electrical specifications for 250 V AC operation at 800 mA with slow blow response. The addition of 125 V DC rating provides extended application flexibility. Active product status ensures long-term availability. Operating temperature range extends to -55°C, providing broader environmental coverage. Approval agencies include CCC, cURus, KC, and VDE, meeting comprehensive regulatory requirements.

SCHURTER 0034.6914 and 0034.6944 (Parametric Equivalents - MXT 250 Series): These parts maintain all primary electrical and mechanical specifications with increased breaking capacity of 100 A and reduced melting I²t of 1.5. Active product status and identical operating temperature range support direct substitution. Selection depends on application requirements for breaking capacity and thermal response characteristics. Both parts carry identical regulatory approvals.

SCHURTER 0034.7114 and 0034.7214 (Parametric Equivalents - MSTU 250 Series): These parts provide intermediate breaking capacity of 50 A with melting I²t of 4.05, positioned between the original part and the MXT 250 series. Active product status and matching operating temperature range support substitution. Regulatory approval limited to cULus requires verification against application compliance requirements.

Littelfuse 38508000440 (Cross-Manufacturer Similar Part): This part operates at 125 V AC, representing a reduced voltage rating compared to the 250 V AC specification of the main part. Dimensional variation in width (4.00mm vs. 8.50mm) and height (8.00mm vs. 8.50mm) may affect board layout compatibility. Selection requires confirmation that application voltage requirements do not exceed 125 V AC and that physical footprint accommodates the different package dimensions. Breaking capacity of 50 A and melting I²t of 2.7 differ from the original specification.

Frequently Asked Questions (FAQ)

Q: Can I use SCHURTER 0034.6614 as a direct replacement for the obsolete 2040.0614?

A: Yes. The 0034.6614 maintains identical current rating (800 mA), AC voltage rating (250 V), response time (slow blow), mounting type (through hole), and physical dimensions (0.335" Dia x 0.335" H). The addition of 125 V DC rating does not affect AC-only applications. Active product status ensures availability.

Q: What is the difference between the MXT 250 series (0034.6914, 0034.6944) and the original MSU 250 series?

A: The MXT 250 series provides increased breaking capacity (100 A vs. 35 A) and reduced melting I²t (1.5 vs. 8). These differences indicate faster thermal response and higher fault current handling capability. Selection depends on whether the application requires these enhanced characteristics or if the original specifications are sufficient.

Q: Why does the Littelfuse 38508000440 have a lower voltage rating (125 V AC vs. 250 V AC)?

A: The Littelfuse part is designed for lower voltage applications. It is not suitable for circuits operating at 250 V AC. Use this part only if application voltage requirements do not exceed 125 V AC and physical package dimensions are compatible with board layout.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 Compliant status, matching the environmental compliance of the original 2040.0614.

Q: What regulatory approvals should I verify for my application?

A: The SCHURTER 0034.6614 carries the broadest approval coverage (CCC, cURus, KC, VDE). The MXT 250 series (0034.6914, 0034.6944) also includes these approvals. The MSTU 250 series (0034.7114, 0034.7214) is limited to cULus approval. Verify that selected part certifications match your application's regulatory requirements.

Q: Can I use parts with different melting I²t values interchangeably?

A: Melting I²t determines thermal response characteristics. Parts with lower melting I²t (MXT 250 series at 1.5) respond faster to overcurrent conditions than the original part (melting I²t of 8). Selection must align with circuit protection requirements and thermal coordination with upstream protective devices.

Q: What is the inventory status of these substitute parts?

A: All substitute parts are listed as active with current inventory: 0034.6614 (4272 pcs), 0034.6914 (1139 pcs), 0034.6944 (1196 pcs), 0034.7114 (1007 pcs), 0034.7214 (1289 pcs), and Littelfuse 38508000440 (863 pcs).

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