SCHURTER 0034.4250 Board Mount Fuse — Equivalent & Substitute Parts

Part Overview

The SCHURTER 0034.4250 is an 800 mA, 125 V AC/DC board mount fuse with fast blow response time, designed for through-hole radial mounting in can package format. This component is active in production and maintains full inventory availability. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical compatibility, and approval certifications to support design flexibility and supply chain continuity.

Key Parameters

Parameter	Value
Current Rating	800 mA
Voltage Rating (AC)	125 V
Voltage Rating (DC)	125 V
Response Time	Fast Blow
Mounting Type	Through Hole
Package / Case	Radial, Can
Breaking Capacity @ Rated Voltage	100 A
Operating Temperature Range	-25°C ~ 85°C
RoHS Status	ROHS3 Compliant
Approval Agency	cURus

Substitute Part Grouping Explanation

Substitute parts for the SCHURTER 0034.4250 are classified into two categories based on parametric alignment:

Parametric Equivalent: SCHURTER 0034.4220 matches all critical electrical parameters (800 mA, 125 V AC/DC, fast blow response) and mechanical specifications (through-hole radial can package, identical dimensions). This part is directly interchangeable with identical performance characteristics and approval certifications.

Similar Substitutes: Littelfuse 0272.800V and Littelfuse 0273.800V share the same electrical ratings (800 mA, 125 V AC/DC, fast blow) and mounting type (through-hole radial can). These parts differ in physical dimensions, breaking capacity, melting I²t values, and operating temperature ranges. Substitution requires verification of board layout compatibility and thermal performance requirements.

Parameter Comparison

Parameter	SCHURTER 0034.4250	SCHURTER 0034.4220	Littelfuse 0272.800V	Littelfuse 0273.800V
Current Rating (Amps)	800 mA	800 mA	800 mA	800 mA
Voltage Rating - AC	125 V	125 V	125 V	125 V
Voltage Rating - DC	125 V	125 V	125 V	125 V
Response Time	Fast Blow	Fast Blow	Fast Blow	Fast Blow
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Can	Radial, Can	Radial, Can, Vertical	Radial, Can, Vertical
Size / Dimension	0.252" Dia x 0.346" H (6.40mm x 8.80mm)	0.252" Dia x 0.346" H (6.40mm x 8.80mm)	0.235" Dia x 0.287" H (5.97mm x 7.30mm)	0.250" Dia x 0.350" H (6.35mm x 8.89mm)
Breaking Capacity @ Rated Voltage	100 A	100 A	10 kA	10 kA
Melting I²t	0.04	0.04	0.113	0.113
Operating Temperature Range	-25°C ~ 85°C	-25°C ~ 85°C	-55°C ~ 125°C	-55°C ~ 85°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	cURus	cURus	CSA, QPL, UL	CSA, QPL, UL

Engineering Selection Recommendations

Direct Replacement: SCHURTER 0034.4220 is the primary equivalent for SCHURTER 0034.4250. Both parts are active products with identical electrical specifications, mechanical dimensions, and approval certifications (cURus). This substitution requires no design modification.

Alternative Substitutes: Littelfuse 0272.800V and Littelfuse 0273.800V are functionally equivalent in electrical performance but introduce design considerations. These parts feature higher breaking capacity (10 kA vs. 100 A), different melting I²t characteristics (0.113 vs. 0.04), and expanded operating temperature ranges. Littelfuse parts carry CSA, QPL, and UL certifications, providing broader regulatory acceptance. Physical dimensions differ, requiring board layout verification before implementation.

Compliance Considerations: All substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the main part. Selection should align with application-specific approval requirements and thermal environment constraints.

Frequently Asked Questions (FAQ)

Q: Can SCHURTER 0034.4220 be used as a direct replacement for SCHURTER 0034.4250?

A: Yes. Both parts share identical electrical ratings (800 mA, 125 V AC/DC), response time (fast blow), mechanical package (through-hole radial can), and physical dimensions (0.252" Dia x 0.346" H). Approval certifications are equivalent. No design changes are required.

Q: What are the key differences between SCHURTER and Littelfuse substitutes?

A: Littelfuse 0272.800V and 0273.800V maintain matching electrical ratings and mounting type but differ in three areas: (1) Physical dimensions vary slightly, requiring board layout verification; (2) Breaking capacity is higher (10 kA vs. 100 A), affecting fault protection characteristics; (3) Melting I²t values differ (0.113 vs. 0.04), influencing thermal response behavior. Littelfuse parts also provide expanded operating temperature ranges and additional certifications (CSA, QPL, UL).

Q: Are dimensional differences between SCHURTER 0034.4250 and Littelfuse substitutes critical?

A: Dimensional compatibility depends on board design. SCHURTER 0034.4250 measures 0.252" Dia x 0.346" H. Littelfuse 0272.800V is smaller (0.235" Dia x 0.287" H), while Littelfuse 0273.800V is slightly larger (0.250" Dia x 0.350" H). Verify mounting hole spacing and clearance requirements before substitution.

Q: Do all substitute parts meet the same regulatory standards?

A: SCHURTER 0034.4250 and 0034.4220 carry cURus approval. Littelfuse 0272.800V and 0273.800V carry CSA, QPL, and UL certifications. All parts are ROHS3 compliant and REACH unaffected. Application-specific regulatory requirements should determine final selection.

Q: What is the significance of melting I²t differences?

A: Melting I²t indicates thermal energy absorption before fuse element melting. SCHURTER parts (0.04) respond faster to thermal stress than Littelfuse parts (0.113). Applications with sensitive thermal protection requirements should account for this difference in fault analysis.

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