Equivalent & Substitute Parts for 5HT 1.6

Part Overview

The 5HT 1.6 is a ceramic cartridge fuse manufactured by Bel Fuse Inc., rated at 1.6 A, 250 V AC, with a 5mm x 20mm form factor and slow-blow response characteristics. The main part number 5HT 1.6 carries an obsolete product status, making identification of active equivalent and substitute parts essential for ongoing system support and procurement.

Ceramic cartridge fuses in this category are used in industrial control systems, power distribution equipment, and consumer electronics requiring overcurrent protection. The obsolescence of the original part necessitates evaluation of functionally equivalent alternatives that maintain electrical and mechanical compatibility.

Substiute Parts

5HT 1.6

Bel Fuse Inc.In Stock: 8215HT 1.6 Datasheet

Current PartRFQ

5HT 1.6-R

Bel Fuse Inc.In Stock: 16085HT 1.6-R Datasheet

DirectRFQ

0001.2506

SCHURTER Inc.In Stock: 17080001.2506 Datasheet

DirectRFQ

0034.2518

SCHURTER Inc.In Stock: 13850034.2518 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for ceramic cartridge fuses is determined by strict alignment of electrical and mechanical parameters. The following criteria establish functional equivalence:

Primary Substitution Criteria:

• Current Rating: Must be 1.6 A
• Voltage Rating (AC): Must be 250 V or higher
• Package / Case: Must be 5mm x 20mm
• Fuse Type: Must be Cartridge, Ceramic
• Response Time: Must be Slow Blow or compatible thermal response
• Mounting Type: Must require holder (same mechanical interface)

Secondary Compatibility Factors:

• Breaking Capacity: Minimum 1.0 kA at rated voltage
• Operating Temperature: Must encompass or match the -55°C ~ 125°C range
• Approval Agencies: Compliance with relevant certifications (CCC, CE, CSA, VDE, UL, PSE)

The substitute parts listed below meet these criteria with the following classifications:

• 5HT 1.6-R (Bel Fuse Inc.): Direct equivalent with identical electrical specifications and active product status
• 0001.2506 (SCHURTER Inc.): Direct equivalent with enhanced DC voltage rating (300 V DC) and active status
• 0034.2518 (SCHURTER Inc.): Similar part with reduced DC voltage rating (125 V DC) and medium-blow response; suitable only for AC-primary applications

Parameter Comparison

Engineering Selection Recommendations

Recommended Primary Substitute: 5HT 1.6-R

The 5HT 1.6-R is the optimal substitute for the obsolete 5HT 1.6. Both parts are manufactured by Bel Fuse Inc. and share identical electrical specifications, thermal response characteristics, and mechanical form factor. The 5HT 1.6-R carries active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment. Current inventory of 1,506 units supports immediate procurement.

Recommended Secondary Substitute: 0001.2506

The 0001.2506 (SCHURTER Inc., SPT 5x20 series) provides direct electrical equivalence with the added benefit of 300 V DC voltage rating, exceeding the AC-only specification of the original part. This part is suitable for applications requiring dual AC/DC voltage protection. Active product status and ROHS3 compliance are confirmed. Inventory of 1,661 units is available.

Conditional Substitute: 0034.2518

The 0034.2518 (SCHURTER Inc., FSM 5x20 series) is classified as a similar part rather than a direct equivalent due to two deviations: medium-blow response time (versus slow-blow) and reduced DC voltage rating (125 V). This part is suitable only for AC-primary applications where medium-blow thermal response is acceptable. Operating temperature range is reduced to -40°C ~ 85°C. Use only when application requirements explicitly permit these parameter variations.

Frequently Asked Questions (FAQ)

Q: Can 5HT 1.6-R be used as a direct replacement for 5HT 1.6?

A: Yes. Both parts are identical in electrical specifications (1.6 A, 250 V AC), response time (slow-blow), and mechanical form factor (5mm x 20mm). The 5HT 1.6-R is the active production equivalent and is the recommended substitute.

Q: What is the difference between 0001.2506 and 5HT 1.6-R?

A: Both parts meet the primary substitution criteria for 1.6 A, 250 V AC, 5mm x 20mm ceramic cartridge fuses. The 0001.2506 provides additional DC voltage rating (300 V) and is manufactured by SCHURTER Inc. rather than Bel Fuse Inc. Selection depends on whether DC voltage protection is required in the application.

Q: Why is 0034.2518 listed as a similar part rather than a direct equivalent?

A: The 0034.2518 deviates from the primary substitution criteria in two parameters: response time (medium-blow instead of slow-blow) and DC voltage rating (125 V instead of unspecified). These differences affect thermal protection characteristics and DC application suitability. Use only when application requirements explicitly permit medium-blow response.

Q: Are all substitute parts compatible with existing fuse holders?

A: Yes. All substitute parts maintain the 5mm x 20mm form factor and require a holder for mounting, ensuring mechanical compatibility with existing installations. Verify that the fuse holder is rated for the selected part's voltage and current specifications.

Q: What certifications apply to these substitute parts?

A: 5HT 1.6-R carries CCC, CE, CSA, cURus, IMQ, PSE, SEMKO, and VDE certifications. 0001.2506 carries CCC, cURus, KC, PSE/JET, and VDE certifications. 0034.2518 carries no listed approval agencies. Verify that selected certifications meet application and regional regulatory requirements.

Q: Is RoHS compliance a factor in substitute selection?

A: The original 5HT 1.6 is RoHS non-compliant. Both active substitutes (5HT 1.6-R and 0001.2506) are ROHS3 compliant, meeting current environmental regulations. For new designs and long-term procurement, ROHS3-compliant parts are recommended.