SCHURTER 0034.3418 Equivalent & Substitute Parts

Part Overview

The SCHURTER 0034.3418 is a 1.25 A, 250 V AC/DC glass cartridge fuse with slow-blow response characteristics, designed for 3AB and 3AG holder compatibility. This component is classified as obsolete, necessitating identification of active equivalent alternatives to maintain circuit protection functionality in applications requiring identical electrical and mechanical specifications.

Key Parameters

Parameter	Value
Current Rating	1.25 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4"
Size / Dimension	0.250" Dia x 1.250" L (6.35mm x 31.75mm)
Mounting Type	Requires Holder
Operating Temperature	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

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

Primary Equivalence Criteria:

Current Rating: 1.25 A (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Slow Blow (exact match required)
Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
Size / Dimension: 0.250" Dia x 1.250" L (exact match required)

Secondary Consideration:

Product Status: Active status preferred for ongoing availability

Parts meeting all primary equivalence criteria are classified as parametric equivalents. The ceramic cartridge fuse 8020.5012 shares identical current rating and physical dimensions but differs in fuse material (ceramic vs. glass) and voltage rating (500 V vs. 250 V), placing it in a separate category as a similar alternative rather than a direct equivalent.

Parameter Comparison

Parameter	0034.3418 (Main)	0034.5227	03131.25HXP	03131.25MXP	03131.25VXP	8020.5012
Manufacturer	SCHURTER Inc.	SCHURTER Inc.	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	SCHURTER Inc.
Current Rating (Amps)	1.25 A	1.25 A	1.25 A	1.25 A	1.25 A	1.25 A
Voltage Rating - AC	250 V	250 V	250 V	250 V	250 V	500 V
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Ceramic
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow Blow	Slow Blow	Slow Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	Cartridge, Non-Standard
Size / Dimension	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	0.250" Dia x 1.252" L (6.35mm x 31.80mm)
Product Status	Obsolete	Obsolete	Active	Active	Active	Active
Breaking Capacity @ Rated Voltage	35 A	100 A	100 A	100 A	100 A	1.5 kA
Melting I²t	7	20.8	24	24	24	3.15
Approval Agency	CE	CSA, UL	CE, CSA, PSE, UL	CE, CSA, PSE, UL	CE, CSA, PSE, UL	cURus
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Parametric Equivalents (Direct Substitutes):

The parts 0034.5227, 03131.25HXP, 03131.25MXP, and 03131.25VXP meet all primary equivalence criteria and are classified as direct parametric equivalents to the 0034.3418. Among these, the Littelfuse 313 series variants (03131.25HXP, 03131.25MXP, 03131.25VXP) are preferred due to active product status and broader regulatory approvals (CE, CSA, PSE, UL). The SCHURTER 0034.5227 remains a valid equivalent but shares obsolete status with the main part.

Similar Alternative (Non-Equivalent):

The SCHURTER 8020.5012 ceramic cartridge fuse shares identical current rating and physical dimensions but operates at 500 V AC, exceeding the 250 V requirement of the original specification. This part is suitable only for applications where higher voltage rating is acceptable and does not constitute a direct replacement for 250 V circuits.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 03131.25HXP, 03131.25MXP, or 03131.25VXP be used as direct replacements for the SCHURTER 0034.3418?

A: Yes. These parts are parametric equivalents meeting all critical specifications: 1.25 A current rating, 250 V AC voltage rating, glass cartridge construction, slow-blow response, and 3AB/3AG package compatibility with identical physical dimensions (0.250" Dia x 1.250" L). All three variants are active products with comprehensive regulatory approvals.

Q: What is the difference between the three Littelfuse variants (03131.25HXP, 03131.25MXP, 03131.25VXP)?

A: All three parts share identical electrical and mechanical specifications. Differences are limited to internal construction or manufacturing batches within the Littelfuse 313 series. Selection among these variants depends on availability and specific procurement requirements.

Q: Is the SCHURTER 8020.5012 a suitable replacement?

A: The 8020.5012 is not a direct equivalent. While it maintains the 1.25 A current rating and similar physical dimensions, it is a ceramic fuse rated for 500 V AC, not 250 V AC. Use this part only in applications where the higher voltage rating is required and compatible with the circuit design.

Q: Why does the 0034.5227 show as obsolete if it is a parametric equivalent?

A: The 0034.5227 is a parametric equivalent but shares obsolete status with the main part. For new designs or ongoing production, the active Littelfuse equivalents (03131.25HXP, 03131.25MXP, 03131.25VXP) are recommended to ensure long-term supply chain continuity.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts, including the main part 0034.3418, are ROHS3 compliant and REACH unaffected, meeting current environmental regulatory requirements.

Q: What is the significance of the breaking capacity difference between parts?

A: Breaking capacity indicates the maximum fault current the fuse can safely interrupt. The main part 0034.3418 has a breaking capacity of 35 A, while equivalents range from 100 A to 1.5 kA. Higher breaking capacity provides greater safety margin in high-fault-current applications but does not affect normal operation at rated current.

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