SCHURTER 0034.4220 Equivalent & Substitute Parts

Part Overview

The SCHURTER 0034.4220 is an 800 mA, 125 V AC/DC board mount fuse in radial can package, designed for through-hole PCB applications. This fast-blow fuse is part of the MSF 125 series and maintains active product status with cURus approval. Equivalent and substitute parts are identified to support design flexibility, inventory optimization, and supply chain continuity for applications requiring 800 mA protection at 125 V AC/DC ratings.

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
Fuse Type	Board Mount (Cartridge Style Excluded)
Package / Case	Radial, Can
Breaking Capacity @ Rated Voltage	100 A (SCHURTER); 10 kA (Littelfuse)
Operating Temperature Range	-25°C ~ 85°C
RoHS Status	ROHS3 Compliant
Approval Agency	cURus (SCHURTER); CSA, QPL, UL (Littelfuse)

Substitute Part Grouping Explanation

Substitution eligibility is determined by matching the following critical parameters:

Current Rating: 800 mA (exact match required)
Voltage Rating: 125 V AC and 125 V DC (exact match required)
Response Time: Fast Blow (exact match required)
Mounting Type: Through Hole (exact match required)
Fuse Type: Board Mount, Cartridge Style Excluded (exact match required)
Package / Case: Radial, Can configuration (exact match required)

All identified substitute parts meet these criteria. Dimensional variations and breaking capacity differences are noted in the parameter comparison table and do not affect functional substitution within the specified electrical ratings.

Parameter Comparison

Parameter	SCHURTER 0034.4220	SCHURTER 0034.4250	Littelfuse 0272.800V	Littelfuse 0273.800V
Manufacturer	SCHURTER Inc.	SCHURTER Inc.	Littelfuse	Littelfuse Inc.
Series	MSF 125	MSF 125	MICRO™ 272	MICRO™ 273
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	-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
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

SCHURTER 0034.4220 and SCHURTER 0034.4250 are parametric equivalents within the MSF 125 series, sharing identical electrical ratings, response characteristics, and thermal specifications. Both maintain cURus approval and ROHS3 compliance.

Littelfuse 0272.800V and 0273.800V are functionally equivalent alternatives with enhanced breaking capacity (10 kA versus 100 A) and broader regulatory approvals (CSA, QPL, UL). The Littelfuse parts feature extended operating temperature ranges and vertical package orientation capability. Dimensional differences are minor and do not affect through-hole PCB mounting compatibility in standard applications.

Selection between SCHURTER and Littelfuse alternatives depends on regulatory requirements specific to the end application, available inventory, and thermal environment specifications. All parts maintain active product status and full RoHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can SCHURTER 0034.4250 directly replace SCHURTER 0034.4220?

A: Yes. Both parts are parametric equivalents within the MSF 125 series with identical current rating (800 mA), voltage ratings (125 V AC/DC), response time (Fast Blow), mounting type (Through Hole), and package configuration (Radial, Can). Dimensional specifications are identical.

Q: Are Littelfuse 0272.800V and 0273.800V suitable replacements for SCHURTER 0034.4220?

A: Yes, from an electrical standpoint. Both Littelfuse parts match the required 800 mA current rating, 125 V AC/DC voltage ratings, Fast Blow response, Through Hole mounting, and Radial Can package. Dimensional variations are minor. However, the higher breaking capacity (10 kA) and different regulatory approvals (CSA, QPL, UL versus cURus) must be evaluated against application-specific requirements.

Q: What are the key dimensional differences between these fuses?

A: SCHURTER 0034.4220 and 0034.4250 are 0.252" diameter × 0.346" height. Littelfuse 0272.800V is 0.235" diameter × 0.287" height. Littelfuse 0273.800V is 0.250" diameter × 0.350" height. All are compatible with standard through-hole radial fuse footprints, though PCB layout verification is recommended for tight spacing applications.

Q: Do all substitute parts have the same thermal operating range?

A: No. SCHURTER parts operate from -25°C to 85°C. Littelfuse 0272.800V operates from -55°C to 125°C, and Littelfuse 0273.800V operates from -55°C to 85°C. Application thermal requirements determine suitability.

Q: What is the significance of the different breaking capacities?

A: SCHURTER parts have 100 A breaking capacity; Littelfuse parts have 10 kA breaking capacity. Breaking capacity indicates the maximum fault current the fuse can safely interrupt. Higher breaking capacity provides additional safety margin in high-fault-current environments but does not affect normal operation at rated current.

Q: Are all parts RoHS3 compliant?

A: Yes. All four parts are ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory standards.

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