SCHURTER 0034.4269 Board Mount Fuse — Equivalent & Substitute Parts

Part Overview

The SCHURTER 0034.4269 is a 100 mA, 125 V AC/DC board mount fuse with fast-blow response characteristics, designed for through-hole radial mounting in a can package. This part carries an obsolete product status, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	0034.4269
Manufacturer	SCHURTER Inc.
Current Rating	100 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
Operating Temperature Range	−25°C to 85°C
Size / Dimension	0.252" Dia × 0.346" H (6.40 mm × 8.80 mm)
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the SCHURTER 0034.4269 is determined by strict equivalence across the following critical parameters:

Current Rating: 100 mA (exact match required)
Voltage Rating — AC: 125 V (exact match required)
Voltage Rating — DC: 125 V (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 (exact match required)

Substitute parts are grouped into two categories:

Parametric Equivalents (SCHURTER Series MSF 125): Parts 0034.4209 and 0034.4239 maintain identical electrical and mechanical specifications to the main part. These are direct functional replacements from the same manufacturer and series.

Cross-Manufacturer Equivalents (Littelfuse MICRO™ and TR3® Series): Parts 0273.100H, 0272.100H, 0272.100V, 0278.100V, and 0279.100V meet all critical electrical parameters. Part 30301000421 differs in DC voltage rating (63 V DC versus 125 V DC) and is not suitable for applications requiring 125 V DC operation.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating (mA)	Voltage AC (V)	Voltage DC (V)	Response Time	Package	Size (mm)	Operating Temp (°C)	Product Status	Breaking Capacity @ Rated Voltage
0034.4269	SCHURTER Inc.	MSF 125	100	125	125	Fast Blow	Radial, Can	6.40 × 8.80	−25 to 85	Obsolete	300 A
0034.4209	SCHURTER Inc.	MSF 125	100	125	125	Fast Blow	Radial, Can	6.40 × 8.80	−25 to 85	Active	100 A
0034.4239	SCHURTER Inc.	MSF 125	100	125	125	Fast Blow	Radial, Can	6.40 × 8.80	−25 to 85	Active	100 A
0273.100H	Littelfuse Inc.	MICRO™ 273	100	125	125	Fast Blow	Radial, Can, Vertical	6.35 × 8.89	−55 to 85	Active	10 kA
0272.100H	Littelfuse Inc.	MICRO™ 272	100	125	125	Fast Blow	Radial, Can, Vertical	5.97 × 7.30	−55 to 125	Active	10 kA
0272.100V	Littelfuse Inc.	MICRO™ 272	100	125	125	Fast Blow	Radial, Can, Vertical	5.97 × 7.30	−55 to 125	Active	10 kA
0278.100V	Littelfuse Inc.	MICRO™ 278	100	125	125	Fast Blow	Radial, Can, Vertical	5.97 × 7.30	−55 to 125	Active	10 kA
0279.100V	Littelfuse Inc.	MICRO™ 279	100	125	125	Fast Blow	Radial, Can, Vertical	6.35 × 8.89	−55 to 85	Active	10 kA
30301000421	Littelfuse Inc.	TR3® 303	100	125	63	Fast Blow	Radial, Can, Vertical	6.00 × 8.00	−25 to 70	Active	50 A

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement):

SCHURTER 0034.4209 and 0034.4239 are the preferred substitutes. Both maintain identical electrical specifications and mechanical dimensions to the obsolete 0034.4269. Both parts carry active product status and ROHS3 compliance. Selection between these two SCHURTER alternatives depends on packaging requirements (both available in bulk) and inventory availability.

Secondary Substitutes (Cross-Manufacturer Alternatives):

Littelfuse MICRO™ series parts (0273.100H, 0272.100H, 0272.100V, 0278.100V, 0279.100V) provide electrical equivalence with enhanced breaking capacity (10 kA versus 300 A or 100 A) and extended operating temperature ranges. These parts are suitable for applications where board space constraints or thermal performance improvements are beneficial. Dimensional variations exist; verify PCB layout compatibility before implementation.

Not Recommended:

Littelfuse 30301000421 (TR3® 303) operates at 63 V DC maximum and is not suitable for circuits requiring 125 V DC operation.

Frequently Asked Questions (FAQ)

Q: Can I use SCHURTER 0034.4209 or 0034.4239 as a direct replacement for the obsolete 0034.4269?

A: Yes. Both parts maintain identical current rating (100 mA), voltage ratings (125 V AC/DC), response time (fast blow), mounting type (through hole), and package dimensions (6.40 mm × 8.80 mm). Both are active products with ROHS3 compliance.

Q: What is the key difference between SCHURTER and Littelfuse substitutes?

A: SCHURTER 0034.4209 and 0034.4239 are identical in electrical and mechanical specifications. Littelfuse MICRO™ and TR3® series parts meet electrical requirements but differ in breaking capacity, operating temperature range, and physical dimensions. Littelfuse parts offer higher breaking capacity (10 kA) and wider temperature ranges in some models.

Q: Are Littelfuse MICRO™ 272 and 278 series interchangeable?

A: Parts 0272.100H, 0272.100V, and 0278.100V share identical electrical specifications and dimensions (5.97 mm × 7.30 mm). Selection depends on mounting orientation requirements and circuit board layout. Both operate across −55°C to 125°C.

Q: Why does Littelfuse 30301000421 appear in the substitute list if it has a different DC voltage rating?

A: This part meets the 100 mA current rating and 125 V AC specification but operates at 63 V DC maximum. It is not electrically equivalent for applications requiring 125 V DC operation and should not be selected for such circuits.

Q: What are the physical dimension constraints when switching from SCHURTER to Littelfuse?

A: SCHURTER 0034.4269, 0034.4209, and 0034.4239 measure 6.40 mm diameter × 8.80 mm height. Littelfuse MICRO™ 272, 278 parts measure 5.97 mm × 7.30 mm (smaller). Littelfuse MICRO™ 273 and 279 measure 6.35 mm × 8.89 mm (similar to SCHURTER). Verify PCB footprint and mounting hole spacing before substitution.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance status.

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