5TTP 1 Glass Cartridge Fuse - Equivalent & Substitute Parts

Part Overview

The 5TTP 1 is a 1 A, 250 V AC/DC slow-blow glass cartridge fuse manufactured by Bel Fuse Inc. in a 5mm x 20mm axial through-hole package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new designs. The 5TTP 1 series provides circuit protection with a 100 A breaking capacity and operates across a temperature range of -55°C to 125°C.

Substiute Parts

5TTP 1

Bel Fuse Inc.In Stock: 8935TTP 1 Datasheet

Current PartRFQ

5TTP 1-R

Bel Fuse Inc.In Stock: 18735TTP 1-R Datasheet

DirectRFQ

5ETP 1-R

Bel Fuse Inc.In Stock: 18935ETP 1-R Datasheet

Parametric EquivalentRFQ

5STP 1-R

Bel Fuse Inc.In Stock: 18065STP 1-R Datasheet

Parametric EquivalentRFQ

TSC-P-1A

OptiFuseIn Stock: 2688TSC-P-1A Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 5TTP 1 is determined by strict equivalence in the following parameters:

• Current Rating: 1 A (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Slow Blow (exact match required)
• Package / Case: 5mm x 20mm (Axial) (exact match required)
• Mounting Type: Through Hole (exact match required)
• Operating Temperature Range: -55°C to 125°C (exact match required)

All substitute parts listed below meet these core electrical and mechanical parameters. Variations in breaking capacity, melting I²t, DC cold resistance, and approval agencies do not preclude substitution when the above parameters are identical.

Parameter Comparison

Engineering Selection Recommendations

For replacement of the obsolete 5TTP 1, the following selection criteria apply:

5TTP 1-R (Bel Fuse Inc.): Direct manufacturer upgrade from the original 5TTP 1 series. Active product status with ROHS3 compliance. Maintains identical electrical specifications with improved DC cold resistance (0.27 Ohms vs. 0.3 Ohms). Recommended for direct substitution in existing designs.

5ETP 1-R (Bel Fuse Inc.): Parametric equivalent with higher breaking capacity (150 A vs. 100 A) and extended approval certifications (CCC, CE, CSA, cULus, SEMKO, VDE). Active product status with ROHS3 compliance. Suitable where enhanced breaking capacity is acceptable.

5STP 1-R (Bel Fuse Inc.): Parametric equivalent with lower breaking capacity (35 A vs. 100 A) and reduced melting I²t (2.4 vs. 8.6). Active product status with ROHS3 compliance and extended certifications (CCC, CE, CSA, cURus, IMQ, SEMKO, VDE). Suitable for applications with lower fault current requirements.

TSC-P-1A (OptiFuse): Cross-manufacturer parametric equivalent with active product status and ROHS3 compliance. Maintains 100 A breaking capacity. Approved to cULus and UL 248 standards. Suitable for applications requiring alternative manufacturer sourcing.

All substitute parts maintain the core electrical and mechanical parameters of the original 5TTP 1 and operate within the same temperature range (-55°C to 125°C).

Frequently Asked Questions (FAQ)

Q: Can the 5TTP 1-R be used as a direct replacement for the 5TTP 1?

A: Yes. The 5TTP 1-R is the active equivalent from the same manufacturer and series. It maintains identical current rating (1 A), voltage rating (250 V), response time (slow blow), and package dimensions (5mm x 20mm axial). The primary difference is product status (active vs. obsolete) and RoHS compliance.

Q: What is the difference between the 5ETP 1-R and 5STP 1-R?

A: Both are parametric equivalents with identical current, voltage, response time, and package specifications. The 5ETP 1-R has a higher breaking capacity (150 A) and higher melting I²t (28), while the 5STP 1-R has a lower breaking capacity (35 A) and lower melting I²t (2.4). Selection depends on the fault current characteristics of the protected circuit.

Q: Is the TSC-P-1A from OptiFuse compatible with the 5TTP 1?

A: Yes. The TSC-P-1A meets all core electrical and mechanical parameters: 1 A current rating, 250 V AC voltage rating, slow-blow response, and 5mm x 20mm axial package. It is approved to cULus and UL 248 standards and is ROHS3 compliant.

Q: Are there any approval agency differences I should consider?

A: The original 5TTP 1 carries CE, CSA, PSE, and UL approvals. The 5TTP 1-R adds cULus certification. The 5ETP 1-R and 5STP 1-R include additional certifications (CCC, SEMKO, VDE). The TSC-P-1A is approved to cULus and UL 248. Selection should align with the approval requirements of your application.

Q: Can I use these substitutes interchangeably in the same circuit?

A: All listed substitutes maintain the same current rating (1 A), voltage rating (250 V), response time (slow blow), and package form factor. They are mechanically and electrically interchangeable in through-hole mounting applications. Verify that the breaking capacity and melting I²t characteristics are appropriate for your circuit's fault current profile.

Q: What is the significance of the melting I²t parameter?

A: Melting I²t indicates the thermal energy required to melt the fuse element. Lower values indicate faster response to overcurrent. The 5STP 1-R (2.4) responds faster than the 5TTP 1 (8.6), while the 5ETP 1-R (28) responds more slowly. Selection should match the protection requirements of the protected circuit.