SCHURTER 3-103-108 Equivalent & Substitute Parts

Part Overview

The SCHURTER 3-103-108 is a 1 A, 125 V AC/DC board mount surface mount fuse in 2-SMD square end block package. This component is classified as Active product status and is designed for applications requiring fast-blow fuse protection in compact surface mount configurations. Substitute parts are identified to address packaging availability, extended operating temperature ranges, or inventory considerations while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Current Rating	1 A
Voltage Rating (AC)	125 V
Voltage Rating (DC)	125 V
Response Time	Fast Blow
Package / Case	2-SMD, Square End Block
Breaking Capacity @ Rated Voltage	50 A AC, 300 A DC
Mounting Type	Surface Mount
Size / Dimension	0.126" L x 0.061" W x 0.061" H (3.20 mm x 1.55 mm x 1.55 mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 3-103-108 are grouped into two categories based on allowed parameter variations:

Upgrade Substitutes (3410.0031.02, 3410.0031.03): These parts maintain identical electrical ratings (1 A, 125 V AC/DC, fast-blow response, 50 A AC / 300 A DC breaking capacity) and mechanical dimensions. They differ in series designation (MGA vs. MGA-A), melting I²t value (0.035 vs. 0.008), extended operating temperature range (-55°C to 150°C vs. -55°C to 125°C), and packaging format (Tape & Reel). These parts are direct functional equivalents with enhanced thermal performance.

Parametric Equivalent (3-103-107): This part is electrically and mechanically identical to the main part number, differing only in packaging format (Cut Tape vs. Tape & Reel). It maintains the same series (MGA-A), melting I²t (0.008), operating temperature range (-55°C to 125°C), and all electrical specifications.

Parameter Comparison

Parameter	3-103-108	3410.0031.02	3410.0031.03	3-103-107
Manufacturer	SCHURTER Inc.	SCHURTER Inc.	SCHURTER Inc.	SCHURTER Inc.
Current Rating (Amps)	1 A	1 A	1 A	1 A
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
Package / Case	2-SMD, Square End Block	2-SMD, Square End Block	2-SMD, Square End Block	2-SMD, Square End Block
Breaking Capacity @ Rated Voltage	50 A AC, 300 A DC	50 A AC, 300 A DC	50 A AC, 300 A DC	50 A AC, 300 A DC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Size / Dimension	0.126" L x 0.061" W x 0.061" H (3.20 mm x 1.55 mm x 1.55 mm)	0.126" L x 0.061" W x 0.061" H (3.20 mm x 1.55 mm x 1.55 mm)	0.126" L x 0.061" W x 0.061" H (3.20 mm x 1.55 mm x 1.55 mm)	0.126" L x 0.061" W x 0.061" H (3.20 mm x 1.55 mm x 1.55 mm)
Operating Temperature	-55°C ~ 125°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 125°C
Melting I²t	0.008	0.035	0.035	0.008
Series	MGA-A	MGA	MGA	MGA-A
Packaging	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)	Cut Tape (CT)
Product Status	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	cURus, UL	cURus	cURus	cURus, UL

Engineering Selection Recommendations

All substitute parts maintain Active product status and ROHS3 compliance. Selection between the main part and substitutes depends on specific application requirements:

For applications requiring standard operating temperature range (-55°C to 125°C): The 3-103-108 and 3-103-107 are functionally equivalent. Selection between these two depends on packaging requirements: use 3-103-108 for Tape & Reel packaging or 3-103-107 for Cut Tape packaging.

For applications requiring extended operating temperature range (-55°C to 150°C): The 3410.0031.02 and 3410.0031.03 provide thermal performance enhancement. Both parts are electrically equivalent and differ only in packaging format (both supplied in Tape & Reel). The choice between these two is determined by inventory availability or supply chain considerations.

Regarding approval certifications: The 3-103-108 and 3-103-107 carry both cURus and UL approvals. The 3410.0031.02 and 3410.0031.03 carry cURus approval. Applications requiring UL certification must use 3-103-108 or 3-103-107.

Frequently Asked Questions (FAQ)

Q: Can 3410.0031.02 or 3410.0031.03 be used as direct replacements for 3-103-108?

A: Yes, from an electrical and mechanical standpoint. All parts share identical current ratings (1 A), voltage ratings (125 V AC/DC), breaking capacity (50 A AC / 300 A DC), response time (fast-blow), and physical dimensions (0.126" L x 0.061" W x 0.061" H). The 3410.0031.02 and 3410.0031.03 offer extended operating temperature capability (-55°C to 150°C vs. -55°C to 125°C). However, if UL certification is required, the 3-103-108 or 3-103-107 must be used.

Q: What is the difference between 3410.0031.02 and 3410.0031.03?

A: These parts are electrically and mechanically identical. Both are supplied in Tape & Reel packaging, share the same current rating, voltage rating, breaking capacity, operating temperature range, and melting I²t value (0.035). The difference is in inventory availability and supply chain designation.

Q: Can I substitute 3-103-107 for 3-103-108?

A: Yes. These parts are parametrically equivalent with identical electrical ratings, operating temperature range, and physical dimensions. The only difference is packaging format: 3-103-108 is supplied in Tape & Reel (TR) and 3-103-107 is supplied in Cut Tape (CT). Both carry cURus and UL approvals.

Q: Why do 3410.0031.02 and 3410.0031.03 have a higher melting I²t value (0.035 vs. 0.008)?

A: The melting I²t parameter reflects the thermal energy required to melt the fuse element. The higher value in the 3410.0031 series is consistent with the extended operating temperature range (-55°C to 150°C). Both values are within the same current rating class and maintain identical breaking capacity specifications.

Q: Which part should I select for high-temperature applications?

A: For applications operating above 125°C, use 3410.0031.02 or 3410.0031.03, which are rated to 150°C. For applications within the -55°C to 125°C range, any of the four parts are suitable, with selection based on packaging format and certification requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All four parts (3-103-108, 3410.0031.02, 3410.0031.03, and 3-103-107) are ROHS3 compliant.

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