SCHURTER 0034.1749 Fuse Glass 2A 250VAC 3AB 3AG Equivalent & Substitute Parts

Part Overview

The SCHURTER 0034.1749 is a 2 A 250 V AC/DC fast-blow glass cartridge fuse designed for 3AB and 3AG holder compatibility with dimensions of 0.250" diameter × 1.252" length (6.35mm × 31.80mm). This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system maintenance and component procurement.

Key Parameters

Parameter	Value
Current Rating	2 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Fast Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4"
Mounting Type	Requires Holder
Size / Dimension	0.250" Dia x 1.252" L (6.35mm x 31.80mm)
Operating Temperature Range	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the SCHURTER 0034.1749 is determined by strict equivalence across the following parameters:

Current Rating: 2 A (exact match required)
Voltage Rating: 250 V AC (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Fast Blow (exact match required)
Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
Mounting Type: Requires Holder (exact match required)
Physical Dimensions: 0.250" diameter × 1.252" length (exact match required)

All substitute parts listed below meet these core electrical and mechanical parameters. Variations in breaking capacity, melting I²t, approval agencies, and operating temperature ranges do not disqualify substitution but represent design differences between manufacturers.

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage (AC)	Fuse Type	Response Time	Package / Case	Size (Dia x L)	Breaking Capacity @ Rated Voltage	Product Status	Approval Agency
0034.1749	SCHURTER Inc.	2 A	250 V	Cartridge, Glass	Fast Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.252" (6.35mm x 31.80mm)	35 A	Obsolete	CSA
0034.5131	SCHURTER Inc.	2 A	250 V	Cartridge, Glass	Fast Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.252" (6.35mm x 31.80mm)	200 A	Obsolete	CSA, UL
0034.1002	SCHURTER Inc.	2 A	250 V	Cartridge, Glass	Fast Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.252" (6.35mm x 31.80mm)	1.5 kA	Obsolete	None Listed
0312002.HXP	Littelfuse Inc.	2 A	250 V	Cartridge, Glass	Fast Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250" (6.35mm x 31.75mm)	100 A	Active	CE, CSA, KC, PSE, UL
0312002.MXP	Littelfuse Inc.	2 A	250 V	Cartridge, Glass	Fast Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250" (6.35mm x 31.75mm)	100 A	Active	CE, CSA, KC, PSE, UL
0312002.VXP	Littelfuse	2 A	250 V	Cartridge, Glass	Fast Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250" (6.35mm x 31.75mm)	100 A	Active	CE, CSA, KC, PSE, UL

Engineering Selection Recommendations

All listed substitute parts meet the core electrical and mechanical requirements for direct replacement of the SCHURTER 0034.1749. Selection should prioritize product status and regulatory compliance:

SCHURTER 0034.5131 is a direct SCHURTER equivalent with obsolete status matching the original part. It provides CSA and UL approval certifications and higher breaking capacity (200 A).

SCHURTER 0034.1002 is a parametric equivalent from SCHURTER with obsolete status. It offers 1.5 kA breaking capacity but carries no listed approval agencies.

Littelfuse 0312002.HXP, 0312002.MXP, and 0312002.VXP are active-status alternatives from Littelfuse Inc. All three carry comprehensive regulatory approvals (CE, CSA, KC, PSE, UL) and represent current manufacturing options. Physical dimensions show a minor length variation (1.250" versus 1.252"), which remains within standard 3AG holder tolerances. These parts are suitable for applications requiring active product support and modern compliance certifications.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 0312002 series parts be used as direct replacements for the SCHURTER 0034.1749?

A: Yes. The Littelfuse 0312002.HXP, 0312002.MXP, and 0312002.VXP all meet the core electrical parameters (2 A, 250 V AC, fast-blow, cartridge glass) and package requirements (3AB, 3AG, 1/4" x 1-1/4"). The 0.002" length difference (1.250" versus 1.252") is within standard holder tolerances and does not affect mechanical compatibility.

Q: What is the difference between the SCHURTER substitute options?

A: SCHURTER 0034.5131 and 0034.1002 are both obsolete parts with identical electrical ratings. The primary differences are breaking capacity (200 A versus 1.5 kA) and approval certifications (0034.5131 includes UL; 0034.1002 has no listed approvals).

Q: Why should I consider active-status parts over obsolete alternatives?

A: Active-status parts such as the Littelfuse 0312002 series offer ongoing manufacturer support, current compliance certifications (CE, CSA, KC, PSE, UL), and assured supply chain availability. Obsolete parts may face procurement challenges and lack modern regulatory documentation.

Q: Are there any compatibility concerns with 3AG holder mounting?

A: No. All substitute parts are specified for 3AB and 3AG holder compatibility with matching 0.250" diameter dimensions. Standard holder tolerances accommodate the minor length variations present in this product group.

Q: What is the significance of breaking capacity differences?

A: Breaking capacity indicates the maximum fault current the fuse can safely interrupt. Higher breaking capacity (200 A, 1.5 kA, 100 A) provides greater safety margin in high-fault-current applications but does not affect normal operation at the 2 A rated current.

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