Equivalent & Substitute Parts for 5TT 500 Glass Cartridge Fuse

Part Overview

The 5TT 500 is a 500 mA, 250 V AC/DC slow-blow glass cartridge fuse manufactured by Bel Fuse Inc. in a 5mm x 20mm form factor. This part is classified as obsolete, making identification of equivalent and substitute components essential for ongoing system maintenance and new design implementations. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts offer functional alternatives within the allowed parameter ranges for this fuse category.

Substiute Parts

5TT 500

Bel Fuse Inc.In Stock: 9725TT 500 Datasheet

Current PartRFQ

5TT 500-R

Bel Fuse Inc.In Stock: 10005TT 500-R Datasheet

DirectRFQ

5ST 500-R

Bel Fuse Inc.In Stock: 227525ST 500-R Datasheet

Parametric EquivalentRFQ

0218.500HXP

Littelfuse Inc.In Stock: 47230218.500HXP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 5TT 500 is determined by strict equivalence in the following critical parameters:

• Current Rating: 500 mA (exact match required)
• Voltage Rating: 250 V AC (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Slow Blow (exact match required)
• Package / Case: 5mm x 20mm (exact match required)
• Mounting Type: Requires Holder (exact match required)

Parts are grouped into three categories based on their relationship to the main part:

Direct Manufacturer Equivalent (5TT 500-R): Same manufacturer (Bel Fuse Inc.), same series (5TT), active product status, identical electrical and mechanical specifications with minor variations in DC cold resistance and compliance certifications.

Parametric Equivalent (5ST 500-R): Same manufacturer (Bel Fuse Inc.), different series (5ST), active product status, all critical parameters match the main part with variations in breaking capacity and melting I²t values.

Similar Cross-Manufacturer Part (0218.500HXP): Different manufacturer (Littelfuse Inc.), different series (218), active product status, all critical parameters match with minor dimensional and resistance variations.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Preferred): The 5TT 500-R is the primary substitute for the obsolete 5TT 500. Both parts are manufactured by Bel Fuse Inc. within the same series. The 5TT 500-R maintains identical electrical specifications and is classified as active product status with ROHS3 compliance. The minor reduction in DC cold resistance (0.865 Ohms vs. 1 Ohm) and enhanced certification scope (cULus vs. UL, CSA, CE) make this the optimal choice for direct substitution.

For Parametric Equivalence: The 5ST 500-R offers full parametric compatibility with all critical electrical and mechanical parameters matching the main part. This part is manufactured by Bel Fuse Inc. and carries active product status with ROHS3 compliance. The reduced breaking capacity (35A vs. 100A) and lower melting I²t (1.4 vs. 2.5) represent design differences within the same fuse category. This part is suitable where the application does not require the higher breaking capacity of the main part.

For Cross-Manufacturer Substitution: The 0218.500HXP from Littelfuse Inc. provides functional equivalence with all critical parameters matching. This part is active and ROHS3 compliant with a broader certification scope (CCC, CE, CSA, K-MARK, SEMKO, UL, VDE). The slightly larger diameter (5.20mm vs. 5.10mm) and lower DC cold resistance (0.37 Ohms) should be evaluated for mechanical fit within the fuse holder assembly.

Frequently Asked Questions (FAQ)

Q: Can the 5TT 500-R be used as a direct replacement for the 5TT 500?

A: Yes. The 5TT 500-R maintains identical current rating (500 mA), voltage rating (250 V AC), fuse type (cartridge glass), response time (slow blow), and package dimensions (5mm x 20mm). Both require a fuse holder for mounting. The 5TT 500-R is the active product equivalent.

Q: What is the difference between the 5TT 500-R and 5ST 500-R?

A: Both parts share identical current, voltage, fuse type, response time, and package specifications. The primary differences are series designation (5TT vs. 5ST), breaking capacity (100A vs. 35A), melting I²t (2.5 vs. 1.4), and DC cold resistance (0.865 vs. 0.54 Ohms). The 5ST 500-R is suitable for applications where the lower breaking capacity is acceptable.

Q: Is the 0218.500HXP from Littelfuse compatible with the same fuse holder as the 5TT 500?

A: The 0218.500HXP has a slightly larger diameter (5.20mm vs. 5.10mm) and identical length (20mm). Mechanical compatibility with the existing fuse holder must be verified before implementation, as holder tolerances may affect fit.

Q: Are all substitute parts RoHS compliant?

A: The 5TT 500 is RoHS non-compliant. All three substitute parts (5TT 500-R, 5ST 500-R, and 0218.500HXP) are ROHS3 compliant, making them suitable for applications requiring RoHS compliance.

Q: What certifications should I consider when selecting a substitute?

A: The 5TT 500 carries CE, CSA, and UL certifications. The 5TT 500-R adds cULus certification. The 5ST 500-R includes CCC, CE, CSA, cURus, IMQ, SEMKO, and VDE certifications. The 0218.500HXP includes CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE certifications. Select based on your application's regional and industry-specific certification requirements.

Q: Can I use the 5ST 500-R in a high-fault-current application?

A: The 5ST 500-R has a breaking capacity of 35A compared to the 5TT 500's 100A. Applications requiring higher breaking capacity should use the 5TT 500-R or evaluate the specific fault current levels in your circuit before substitution.