SCHURTER 7181.4121 Equivalent & Substitute Parts

Part Overview

The SCHURTER 7181.4121 is a 1A 500VAC cartridge fuse in the 5AG package format (10mm x 38mm Midget). This component is classified as obsolete, making identification of functionally equivalent alternatives essential for system maintenance and component procurement. The part requires a dedicated fuse holder for installation and is designed for electrical and industrial applications operating within -40°C to 85°C temperature range.

Substiute Parts

7181.4121

SCHURTER Inc.In Stock: 8877181.4121 Datasheet

Current PartRFQ

0BLS001.T

Littelfuse Inc.In Stock: 10280BLS001.T Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SCHURTER 7181.4121 is determined by the following critical parameters:

Mandatory Matching Parameters:

• Fuse Type: Cartridge
• Current Rating: 1A
• Package / Case: 5AG, 10mm x 38mm (Midget)
• Mounting Type: Requires Holder

Allowable Variation Parameters:

• Voltage Rating (AC): Must be equal to or greater than 500VAC
• Breaking Capacity: Must be equal to or greater than 120kA
• Response Time: May differ based on application requirements
• Approval Agencies: Additional certifications acceptable

The Littelfuse 0BLS001.T qualifies as a direct substitute based on matching current rating (1A), identical package format (5AG, 10mm x 38mm), and cartridge fuse type. The substitute provides higher voltage rating (600VAC vs. 500VAC) and maintains RoHS3 compliance, supporting broader application compatibility.

Parameter Comparison

Engineering Selection Recommendations

The Littelfuse 0BLS001.T is the identified substitute for the obsolete SCHURTER 7181.4121. Selection is based on:

• Compliance Alignment: Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory consistency.
• Active Product Status: The Littelfuse component is actively manufactured, providing supply chain continuity and long-term availability.
• Certification Enhancement: The substitute carries CSA and UL approvals, providing additional third-party validation beyond the original part specification.
• Voltage Margin: The 600VAC rating of the substitute exceeds the 500VAC requirement, supporting operation across the original design envelope.
• Physical Compatibility: Identical 5AG package dimensions and holder mounting requirements ensure direct mechanical fit within existing assemblies.

Note: The substitute exhibits lower breaking capacity (10kA vs. 120kA). Verification of breaking capacity requirements within the specific application circuit is necessary to confirm suitability.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 0BLS001.T be used as a direct replacement in existing SCHURTER 7181.4121 installations?

A: Yes, for mechanical and electrical compatibility. Both components share identical current rating (1A), package format (5AG, 10mm x 38mm), and mounting requirements. The substitute's higher voltage rating (600VAC) supports the original 500VAC application. However, the reduced breaking capacity (10kA vs. 120kA) must be evaluated against circuit fault current levels.

Q: What is the significance of the 5AG package designation?

A: The 5AG designation identifies a standardized midget cartridge fuse format with dimensions of 10mm diameter by 38mm length. This standardization ensures physical and mechanical interchangeability between fuses of different manufacturers within this package class, provided electrical ratings remain compatible.

Q: Why does the substitute have a lower breaking capacity?

A: Breaking capacity represents the maximum fault current a fuse can safely interrupt. The Littelfuse 0BLS001.T is rated for 10kA breaking capacity at its rated voltage, compared to the SCHURTER part's 120kA. This difference reflects different design specifications and intended application environments. Circuit analysis is required to determine if the substitute's breaking capacity is adequate for the specific installation.

Q: Are there temperature operating range differences between the parts?

A: The SCHURTER 7181.4121 specifies an operating temperature range of -40°C to 85°C. The Littelfuse 0BLS001.T does not provide an explicit operating temperature specification in the available data. Confirmation of temperature compatibility with the application environment is recommended.

Q: What does "Fast Blow" response time mean for the Littelfuse substitute?

A: Fast Blow indicates the fuse responds quickly to overcurrent conditions, opening the circuit in minimal time. This characteristic differs from the SCHURTER part, for which response time is not specified. Fast Blow fuses are suitable for circuits sensitive to transient overcurrents and requiring rapid protection response.