SCHURTER 2070.0021.11 Surface Mount Fuse – Equivalent & Substitute Parts

Part Overview

The SCHURTER 2070.0021.11 is a 3.15 A, 250 V AC/DC surface mount board fuse in 2-SMD, J-Lead package configuration. This part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and procurement continuity. The OSU 250 series fuse is designed for fast-blow response characteristics and meets cURus and VDE approval standards. Substitute parts must maintain identical electrical ratings, mechanical dimensions, and approval certifications to ensure direct board-level compatibility.

Substiute Parts

2070.0021.11

SCHURTER Inc.In Stock: 8112070.0021.11 Datasheet

Current PartRFQ

3403.0021.11

SCHURTER Inc.In Stock: 14243403.0021.11 Datasheet

DirectRFQ

3403.0020.11

SCHURTER Inc.In Stock: 10763403.0020.11 Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 2070.0021.11 are classified based on electrical parameter equivalence and product status:

Direct Equivalent (Active Status): Part 3403.0021.11 maintains identical electrical specifications: 3.15 A current rating, 250 V AC/DC voltage rating, fast-blow response, 100 A breaking capacity, and 4.8 melting I²t. Physical dimensions, package configuration (2-SMD, J-Lead), and approval certifications (cURus, VDE) are identical. The primary difference is product status (active vs. obsolete) and series designation (OMF 250 vs. OSU 250). Operating temperature range extends to -55°C, providing enhanced low-temperature performance.

Current Rating Variant: Part 3403.0020.11 is a 2.5 A rated fuse within the same OMF 250 series. This part shares identical voltage ratings (250 V AC/DC), package configuration, mounting type, and approval certifications. The melting I²t is reduced to 2.6 (from 4.8), reflecting the lower current rating. This part is suitable only for applications where the circuit design permits a lower current threshold.

Substitution Criteria: All substitute parts must satisfy the following conditions:

• Identical current rating (3.15 A for direct equivalents)
• Identical voltage ratings (250 V AC and 250 V DC)
• Identical package and mounting configuration (2-SMD, J-Lead, surface mount)
• Identical response time classification (fast blow)
• Identical or superior approval certifications (cURus, VDE minimum)
• Physical dimensions within tolerance (11.00 mm × 4.60 mm × 3.90 mm)

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: Part 3403.0021.11 is the recommended direct replacement for the obsolete 2070.0021.11. Both parts are manufactured by SCHURTER Inc. and maintain identical electrical and mechanical specifications. The 3403.0021.11 is classified as active product status, ensuring long-term availability and supply chain continuity. Both parts carry cURus and VDE certifications, meeting the same regulatory and safety standards. The extended operating temperature range (-55°C to 125°C) of the 3403.0021.11 provides additional environmental margin compared to the original part (-40°C to 125°C). ROHS3 compliance is maintained across both parts.

Alternative Consideration: Part 3403.0020.11 may be considered only in applications where circuit design permits a reduced current threshold of 2.5 A. This part shares identical voltage ratings, package configuration, and approval certifications. The reduced melting I²t (2.6 vs. 4.8) reflects the lower current rating and must be evaluated against circuit protection requirements. This part is not a direct substitute but rather a lower-current variant within the same product family.

Frequently Asked Questions (FAQ)

Q: Can 3403.0021.11 be used as a direct replacement for 2070.0021.11 on existing PCB assemblies?

A: Yes. The 3403.0021.11 maintains identical current rating (3.15 A), voltage ratings (250 V AC/DC), package configuration (2-SMD, J-Lead), physical dimensions (11.00 mm × 4.60 mm × 3.90 mm), and approval certifications (cURus, VDE). No circuit redesign or PCB layout modification is required.

Q: What is the difference between the OSU 250 and OMF 250 series?

A: Both series are SCHURTER surface mount fuse products with identical electrical and mechanical specifications for the 3.15 A, 250 V rating. The OSU 250 series (2070.0021.11) is obsolete, while the OMF 250 series (3403.0021.11) is active. The OMF 250 series offers extended operating temperature range (-55°C vs. -40°C minimum).

Q: Is 3403.0020.11 (2.5 A) compatible with designs specified for 3.15 A fuses?

A: No. The 3403.0020.11 has a lower current rating (2.5 A vs. 3.15 A) and reduced melting I²t (2.6 vs. 4.8). This part is suitable only for applications where the circuit design permits a lower current threshold. Use of this part in a 3.15 A circuit may result in nuisance fuse operation.

Q: Do all substitute parts meet the same regulatory certifications?

A: Yes. All parts listed (2070.0021.11, 3403.0021.11, and 3403.0020.11) carry cURus and VDE approvals and are ROHS3 compliant. Regulatory compliance is maintained across all substitutes.

Q: What is the impact of the extended operating temperature range in 3403.0021.11?

A: The 3403.0021.11 operates from -55°C to 125°C, compared to -40°C to 125°C for the original 2070.0021.11. This extended low-temperature capability provides additional environmental margin for applications operating in cold conditions.