Littelfuse 31114000021 Ceramic Fuse 4A 250VAC 5x20mm - Equivalent & Substitute Parts

Part Overview

The Littelfuse 31114000021 is a ceramic cartridge fuse rated for 4A at 250VAC, housed in a 5mm x 20mm form factor. This fuse requires a compatible holder for installation and is designed for general-purpose circuit protection applications. The part maintains Active product status with full RoHS3 compliance and REACH unaffected designation. Substitute parts are identified when equivalent electrical and mechanical parameters align with the original specification, ensuring functional interchangeability in the target application.

Substiute Parts

31114000021

Littelfuse Inc.In Stock: 111331114000021 Datasheet

Current PartRFQ

0034.2522

SCHURTER Inc.In Stock: 23520034.2522 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment of the following parameters:

• Current Rating: 4 A (exact match required)
• Voltage Rating - AC: 250 V (exact match required)
• Fuse Type: Cartridge, Ceramic (exact match required)
• Package / Case: 5mm x 20mm (exact match required)
• Mounting Type: Requires Holder (exact match required)
• Operating Temperature Range: -40°C ~ 85°C (exact match required)
• RoHS Compliance: RoHS3 Compliant (exact match required)

The SCHURTER Inc. part 0034.2522 meets all mandatory substitution criteria. Additional DC voltage rating (125V DC) and differing breaking capacity values do not disqualify substitution when AC parameters are equivalent.

Parameter Comparison

Engineering Selection Recommendations

Both the Littelfuse 31114000021 and SCHURTER 0034.2522 maintain Active product status with full regulatory compliance (RoHS3 and REACH unaffected). Selection between these parts should be based on application-specific requirements regarding breaking capacity and melting I²t characteristics. The Littelfuse part provides higher breaking capacity (1.5 kA vs 1 kA), while the SCHURTER part offers additional DC voltage rating capability (125V DC) and higher melting I²t (35.2 vs 30). Both parts are suitable for 250VAC 4A circuit protection in the 5x20mm form factor.

Frequently Asked Questions (FAQ)

Q: Can the SCHURTER 0034.2522 directly replace the Littelfuse 31114000021?

A: Yes. Both parts share identical current rating (4A), AC voltage rating (250V), ceramic cartridge fuse type, 5x20mm package, and operating temperature range (-40°C to 85°C). Both require a compatible fuse holder and maintain RoHS3 compliance.

Q: What is the significance of the different breaking capacity values?

A: Breaking capacity indicates the maximum fault current the fuse can safely interrupt. The Littelfuse part (1.5 kA) has higher breaking capacity than the SCHURTER part (1 kA). Application requirements determine whether this difference is material to your circuit protection design.

Q: Does the SCHURTER part's DC voltage rating affect AC-only applications?

A: No. The SCHURTER part's 125V DC rating is an additional capability that does not impact performance in AC-only circuits. The 250V AC rating is the controlling specification for AC applications.

Q: Are both parts physically compatible with the same fuse holder?

A: Yes. Both parts use the identical 5x20mm form factor and require a standard 5x20mm fuse holder. Physical installation is interchangeable.

Q: What does "Medium Blow" response time mean for the SCHURTER part?

A: Response time characterizes the fuse's thermal response to overcurrent conditions. Medium Blow indicates a moderate response curve suitable for general-purpose circuit protection. The Littelfuse part does not specify response time in the provided data.