SCHURTER 0034.5131 Equivalent & Substitute Parts

Part Overview

The SCHURTER 0034.5131 is a 2A 250VAC fast-blow glass fuse cartridge in 3AB/3AG package format (1/4" x 1-1/4"). This component is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new designs. The fuse requires a compatible holder and is approved by CSA and UL standards. Substitute parts must maintain identical electrical ratings, mechanical dimensions, and holder compatibility to ensure direct replacement capability.

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"
Size / Dimension	0.250" Dia x 1.252" L (6.35mm x 31.80mm)
Breaking Capacity @ Rated Voltage	200A
Operating Temperature Range	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the SCHURTER 0034.5131 are classified into two categories based on substitution compatibility:

Direct Equivalents (Glass Fuse, Identical Electrical Ratings): Littelfuse 0312002.HXP, 0312002.MXP, and 0312002.VXP are direct substitutes. These parts maintain the same 2A 250VAC rating, fast-blow response, glass cartridge construction, and 3AB/3AG package compatibility. All three are active products with higher inventory availability than the obsolete main part.

Parametric Equivalents (Glass Fuse, Identical Electrical Ratings, Alternative Manufacturers): Bel Fuse 3AG 2-R and OptiFuse FSA-2A meet the same electrical and mechanical specifications (2A 250VAC, fast-blow, glass cartridge, 3AB/3AG package). These parts provide cross-manufacturer alternatives with active product status.

Voltage-Upgraded Alternative (Ceramic Fuse, Higher Voltage Rating): SCHURTER 8020.5071 is a ceramic fuse variant rated at 2A 500VAC. While it maintains the same current rating, package format, and fast-blow response, the elevated voltage rating and ceramic construction represent a design upgrade rather than a direct equivalent. This part is suitable only when higher voltage tolerance is required.

Substitution is determined by matching: current rating (2A), AC voltage rating (250V minimum), fuse type (glass cartridge), response time (fast-blow), and package format (3AB/3AG, 1/4" x 1-1/4").

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (A)	Voltage Rating (VAC)	Fuse Type	Response Time	Package / Case	Size (mm)	Breaking Capacity (A)	Operating Temp (°C)	Product Status
0034.5131	SCHURTER Inc.	2	250	Glass	Fast Blow	3AB, 3AG, 1/4" x 1-1/4"	6.35 x 31.80	200	-55 ~ 125	Obsolete
0312002.HXP	Littelfuse Inc.	2	250	Glass	Fast Blow	3AB, 3AG, 1/4" x 1-1/4"	6.35 x 31.75	100	-55 ~ 125	Active
0312002.MXP	Littelfuse Inc.	2	250	Glass	Fast Blow	3AB, 3AG, 1/4" x 1-1/4"	6.35 x 31.75	100	-55 ~ 125	Active
0312002.VXP	Littelfuse	2	250	Glass	Fast Blow	3AB, 3AG, 1/4" x 1-1/4"	6.35 x 31.75	100	-55 ~ 125	Active
3AG 2-R	Bel Fuse Inc.	2	250	Glass	Fast Blow	3AB, 3AG, 1/4" x 1-1/4"	6.35 x 31.80	200	-55 ~ 125	Active
FSA-2A	OptiFuse	2	250	Glass	Fast Blow	3AB, 3AG, 1/4" x 1-1/4"	6.35 x 31.80	100	-55 ~ 125	Active
8020.5071	SCHURTER Inc.	2	500	Ceramic	Fast Blow	3AB, 3AG, 1/4" x 1-1/4"	6.35 x 31.80	1500	-40 ~ 85	Active

Engineering Selection Recommendations

Primary Substitutes (Direct Replacement): Littelfuse 0312002.HXP, 0312002.MXP, and 0312002.VXP are recommended as primary substitutes. All three maintain identical electrical specifications (2A 250VAC), glass cartridge construction, fast-blow response, and 3AB/3AG package compatibility. These parts carry active product status with robust inventory availability and hold CE, CSA, KC, PSE, and UL certifications, exceeding the original part's CSA/UL approval scope.

Secondary Substitutes (Cross-Manufacturer Equivalents): Bel Fuse 3AG 2-R and OptiFuse FSA-2A provide equivalent functionality with active product status. Both maintain the 2A 250VAC rating, glass cartridge type, fast-blow response, and identical package format. Bel Fuse 3AG 2-R matches the original breaking capacity (200A), while OptiFuse FSA-2A provides 100A breaking capacity. Both hold appropriate regulatory certifications (CE, CSA, cULus/UL 248, PSE).

Voltage-Upgraded Alternative: SCHURTER 8020.5071 is suitable only when system design requires elevated voltage tolerance (500VAC). The ceramic construction and increased breaking capacity (1.5kA) represent design changes beyond direct substitution. This part is not interchangeable for 250VAC applications.

Compliance Considerations: All recommended substitutes maintain ROHS3 compliance and REACH unaffected status. Operating temperature ranges align with the original part (-55°C ~ 125°C) across direct equivalents, supporting thermal compatibility in existing designs.

Frequently Asked Questions (FAQ)

Q: Can I use Littelfuse 0312002.HXP, 0312002.MXP, or 0312002.VXP interchangeably with the SCHURTER 0034.5131?

A: Yes. All three Littelfuse parts are direct substitutes. They maintain identical 2A 250VAC ratings, glass cartridge construction, fast-blow response, and 3AB/3AG package compatibility. The minor dimensional variation (31.75mm vs. 31.80mm length) is within standard tolerance for holder compatibility.

Q: What is the difference between the Littelfuse 0312002 variants (HXP, MXP, VXP)?

A: All three variants share identical electrical and mechanical specifications. The suffix designations (HXP, MXP, VXP) represent internal Littelfuse product line classifications. From an engineering substitution perspective, they are functionally equivalent.

Q: Can I substitute the SCHURTER 0034.5131 with the SCHURTER 8020.5071?

A: No, not for direct replacement in 250VAC circuits. The 8020.5071 is rated at 500VAC and uses ceramic construction instead of glass. It is suitable only when system design requires higher voltage tolerance. Using it in a 250VAC application introduces unnecessary design changes and may affect circuit protection characteristics.

Q: Are Bel Fuse 3AG 2-R and OptiFuse FSA-2A suitable replacements?

A: Yes. Both parts meet the electrical and mechanical requirements (2A 250VAC, glass cartridge, fast-blow, 3AB/3AG package). They are active products with appropriate regulatory certifications. The primary difference is breaking capacity: Bel Fuse matches the original 200A rating, while OptiFuse provides 100A.

Q: What certifications should I verify for substitute parts?

A: All recommended substitutes hold CSA and UL certifications or equivalent (cULus, CE, PSE, KC). Verify that the selected substitute's certification scope covers your specific application requirements.

Q: Are there any temperature range limitations when substituting?

A: Direct equivalents (Littelfuse 0312002 series, Bel Fuse 3AG 2-R, OptiFuse FSA-2A) maintain the original operating range (-55°C ~ 125°C). The SCHURTER 8020.5071 ceramic alternative operates at -40°C ~ 85°C, which is narrower and may not be suitable for applications requiring the full -55°C lower limit.

Q: Do all substitute parts require the same holder type?

A: Yes. All recommended substitutes use the 3AB/3AG package format and are compatible with holders designed for 1/4" x 1-1/4" cartridge fuses. Verify holder compatibility before installation.

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