FSA-250MA Equivalent & Substitute Parts

Part Overview

The FSA-250MA is a 250 mA, 250 V AC/DC fast-blow glass cartridge fuse manufactured by OptiFuse. This component is designed for circuit protection in applications requiring a 3AB/3AG form factor with a 1/4" x 1-1/4" package dimension. The part is currently Active in product status with 1093 units in stock. Substitute parts are identified when equivalent electrical ratings, mechanical dimensions, and functional characteristics align with the original specification, enabling direct replacement in holder-based fuse applications.

Substiute Parts

FSA-250MA

OptiFuseIn Stock: 1126FSA-250MA Datasheet

Current PartRFQ

0034.5114

SCHURTER Inc.In Stock: 11160034.5114 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FSA-250MA is determined by strict equivalence across the following critical parameters:

• Current Rating: 250 mA (exact match required)
• Voltage Rating: 250 V AC (exact match required)
• Response Time: Fast Blow (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
• Physical Dimensions: 0.250" Dia x 1.252" L (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)
• RoHS Compliance: ROHS3 Compliant (exact match required)

The substitute part 0034.5114 manufactured by SCHURTER Inc. meets all critical electrical and mechanical parameters for direct substitution. Differences in breaking capacity and product status do not preclude functional equivalence in standard circuit protection applications.

Parameter Comparison

Engineering Selection Recommendations

FSA-250MA (OptiFuse) is the primary selection for new designs and active production applications. This part carries Active product status with full availability (1093 units in stock) and holds current UL 248 certification with cULus approval.

0034.5114 (SCHURTER Inc.) is a parametric equivalent suitable for direct replacement in existing installations or legacy system maintenance. This part is classified as Obsolete and carries CSA and UL approvals. The higher breaking capacity (200A versus 100A) provides additional margin in fault conditions. Selection of this substitute is appropriate when inventory of the primary part is unavailable and the application permits use of an obsolete-status component.

Both parts satisfy identical electrical performance requirements, mechanical compatibility with 3AB/3AG holders, and environmental operating specifications. Compliance with ROHS3 requirements is confirmed for both options.

Frequently Asked Questions (FAQ)

Q: Can 0034.5114 be used as a direct replacement for FSA-250MA?

A: Yes. Both parts share identical current rating (250 mA), voltage rating (250 V AC), response time (Fast Blow), fuse type (Cartridge, Glass), package designation (3AB, 3AG), physical dimensions (0.250" Dia x 1.252" L), and operating temperature range (-55°C ~ 125°C). Direct substitution in 3AB/3AG fuse holders is supported.

Q: What is the significance of the different breaking capacities?

A: FSA-250MA has a breaking capacity of 100A, while 0034.5114 has 200A. Breaking capacity defines the maximum fault current the fuse can safely interrupt. The higher breaking capacity of 0034.5114 does not affect normal operation and provides additional safety margin in high-fault-current environments. Both ratings are suitable for standard circuit protection applications.

Q: Why is 0034.5114 listed as Obsolete?

A: Product status reflects manufacturer lifecycle classification. Obsolete status indicates the part is no longer in active production. However, the part remains functionally equivalent and is available through inventory channels. Use of obsolete parts is appropriate for maintenance and replacement applications where new production status is not a requirement.

Q: Are there any compliance differences between these parts?

A: FSA-250MA carries cULus and UL 248 certifications. 0034.5114 carries CSA and UL certifications. Both parts are ROHS3 compliant. Certification differences reflect regional approval pathways. Selection should align with application-specific regulatory requirements.

Q: Can these fuses be used without a holder?

A: No. Both FSA-250MA and 0034.5114 require a compatible 3AB or 3AG fuse holder for installation. These are cartridge-type fuses designed for holder-based mounting only.

Q: What is the Melting I²t value for 0034.5114?

A: The Melting I²t value for 0034.5114 is not provided in the available technical data. Only FSA-250MA specifies this parameter at 0.0123.