SCHURTER 0034.7321 Board Mount Fuse – Equivalent & Substitute Parts

Part Overview

The SCHURTER 0034.7321 is a 4 A, 250 V AC/DC board mount fuse with radial, can-style vertical packaging for through-hole applications. This fuse is classified as Active product status and is designed for circuit protection in industrial and commercial electronics. Substitute parts become necessary when the primary part experiences extended lead times, inventory constraints, or when design flexibility across approved alternatives is required for supply chain optimization.

Key Parameters

Parameter	Value
Current Rating	4 A
Voltage Rating (AC)	250 V
Response Time	Slow Blow
Mounting Type	Through Hole
Fuse Type	Board Mount (Cartridge Style Excluded)
Package / Case	Radial, Can, Vertical
Operating Temperature Range	-40°C ~ 85°C
Size / Dimension	0.335" Dia x 0.335" H (8.50mm x 8.50mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the SCHURTER 0034.7321 are qualified based on strict electrical and mechanical parameter alignment:

Primary Substitution Criteria:

Current Rating: 4 A (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)
Operating Temperature Range: -40°C ~ 85°C (exact match required)
RoHS Status: ROHS3 Compliant (exact match required)

Identified Substitutes:

SCHURTER 0034.6981 (Parametric Equivalent) – Identical electrical and mechanical specifications with enhanced breaking capacity (100 A vs. 50 A) and expanded approval certifications.
Littelfuse 37414000000 (Similar Equivalent) – Matches all critical electrical parameters and mounting specifications. Minor dimensional variance in height (0.315" vs. 0.335") remains within functional tolerance for radial through-hole board mount applications.

Parameter Comparison

Parameter	SCHURTER 0034.7321	SCHURTER 0034.6981	Littelfuse 37414000000
Manufacturer	SCHURTER Inc.	SCHURTER Inc.	Littelfuse Inc.
Current Rating (Amps)	4 A	4 A	4 A
Voltage Rating - AC	250 V	250 V	250 V
Response Time	Slow Blow	Slow Blow	Slow Blow
Mounting Type	Through Hole	Through Hole	Through Hole
Fuse Type	Board Mount (Cartridge Style Excluded)	Board Mount (Cartridge Style Excluded)	Board Mount (Cartridge Style Excluded)
Package / Case	Radial, Can, Vertical	Radial, Can, Vertical	Radial, Can, Vertical
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 0.315" H (8.50mm x 8.00mm)
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Breaking Capacity @ Rated Voltage	50 A	100 A	50 A
Melting I²t	67.2	77	36
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active
Approval Agency	cULus	CCC, cURus, KC, PSE/JET, VDE	CSA, cULus

Engineering Selection Recommendations

SCHURTER 0034.6981 is the primary parametric equivalent. It maintains identical electrical and mechanical specifications to the SCHURTER 0034.7321 while offering enhanced breaking capacity (100 A) and broader regulatory approvals (CCC, cURus, KC, PSE/JET, VDE). This part is suitable for direct substitution in all applications where the original part is specified.

Littelfuse 37414000000 qualifies as a functional equivalent with the following considerations: it meets all critical electrical parameters (4 A, 250 V, Slow Blow response) and mounting requirements (Through Hole, Radial, Can, Vertical). The height dimension is 0.315" (8.00mm) compared to 0.335" (8.50mm) for the primary part. This 0.02" (0.50mm) reduction in height is within acceptable tolerance for radial through-hole board mount applications and does not affect electrical performance or circuit board layout compatibility. Regulatory approvals include CSA and cULus certification.

Both substitute parts carry Active product status and ROHS3 compliance, ensuring long-term availability and environmental regulatory alignment.

Frequently Asked Questions (FAQ)

Q: Can SCHURTER 0034.6981 be used as a direct replacement for SCHURTER 0034.7321?

A: Yes. The 0034.6981 is a parametric equivalent with identical current rating (4 A), voltage rating (250 V), response time (Slow Blow), mounting type (Through Hole), package style (Radial, Can, Vertical), and operating temperature range (-40°C ~ 85°C). The enhanced breaking capacity (100 A vs. 50 A) and expanded certifications provide additional design margin without affecting compatibility.

Q: What is the significance of the height difference between SCHURTER 0034.7321 and Littelfuse 37414000000?

A: The Littelfuse part is 0.02" (0.50mm) shorter in height (0.315" vs. 0.335"). For radial through-hole board mount fuses, this dimensional variance is within functional tolerance and does not impact electrical performance, circuit board layout, or component placement. Both parts maintain the same 0.335" diameter and vertical orientation.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. SCHURTER 0034.7321, SCHURTER 0034.6981, and Littelfuse 37414000000 are all ROHS3 compliant, ensuring compliance with environmental and hazardous substance regulations.

Q: What regulatory certifications apply to each part?

A: SCHURTER 0034.7321 carries cULus certification. SCHURTER 0034.6981 carries CCC, cURus, KC, PSE/JET, and VDE certifications. Littelfuse 37414000000 carries CSA and cULus certifications. Selection should align with the regulatory requirements of the target application and geographic market.

Q: Can these parts be used interchangeably in the same circuit board design?

A: Yes, provided the circuit board layout accommodates the dimensional specifications of the selected part. The height difference between SCHURTER 0034.7321 (0.335" H) and Littelfuse 37414000000 (0.315" H) is minimal and does not affect through-hole mounting compatibility or electrical function. SCHURTER 0034.6981 matches the original dimensions exactly.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message