5STP 1.25-R Equivalent & Substitute Parts

Part Overview

The 5STP 1.25-R is a 1.25 A, 250 V AC/DC slow-blow glass cartridge fuse with a 5mm x 20mm axial form factor, manufactured by Bel Fuse Inc. This component is actively produced and widely used in circuit protection applications requiring reliable overcurrent protection with delayed response characteristics. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, and functional performance parameters to ensure direct interchangeability in circuit protection designs.

Substiute Parts

5STP 1.25-R

Bel Fuse Inc.In Stock: 10845STP 1.25-R Datasheet

Current PartRFQ

5ETP 1.25-R

Bel Fuse Inc.In Stock: 21195ETP 1.25-R Datasheet

Parametric EquivalentRFQ

5TTP 1.25-R

Bel Fuse Inc.In Stock: 17625TTP 1.25-R Datasheet

Parametric EquivalentRFQ

0034.3118.PT

SCHURTER Inc.In Stock: 38580034.3118.PT Datasheet

DirectRFQ

0034.3118.TR

SCHURTER Inc.In Stock: 39010034.3118.TR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 5STP 1.25-R is determined by the following mandatory parameters:

• Current Rating: 1.25 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 ~ 125°C (exact match required)

All identified substitute parts meet these core electrical and mechanical parameters. Variations in Breaking Capacity, Melting I²t, DC Cold Resistance, and specific approval certifications do not preclude substitution when the primary functional parameters are identical.

Parameter Comparison

Engineering Selection Recommendations

All identified substitute parts are actively produced and ROHS3 compliant, meeting environmental and regulatory requirements. Selection among equivalent parts should be based on:

• Approval Agency certifications required for the application (CCC, CE, CSA, cURus, IMQ, SEMKO, VDE, PSE)
• Packaging format availability (Bulk, Cut Tape)
• Inventory requirements and lead time considerations
• Breaking Capacity and Melting I²t specifications if application-specific performance thresholds exist

The 5STP 1.25-R, 5ETP 1.25-R, and 5TTP 1.25-R are all Bel Fuse Inc. products with identical core electrical and mechanical parameters. The 0034.3118.PT and 0034.3118.TR are SCHURTER Inc. equivalents available in Bulk and Cut Tape packaging respectively, with identical dimensional and electrical specifications.

Frequently Asked Questions (FAQ)

Q: Can 5ETP 1.25-R replace 5STP 1.25-R directly?

A: Yes. Both parts share identical current rating (1.25 A), voltage rating (250 V AC), fuse type (Cartridge, Glass), response time (Slow Blow), package dimensions (5mm x 20mm), and operating temperature range (-55°C ~ 125°C). The 5ETP 1.25-R has a higher Breaking Capacity (150 A vs. 35 A) and higher Melting I²t (42 vs. 4.1), which does not prevent substitution.

Q: What is the difference between 0034.3118.PT and 0034.3118.TR?

A: Both are SCHURTER Inc. equivalents with identical electrical and mechanical specifications. The primary difference is packaging: 0034.3118.PT is supplied in Bulk format, while 0034.3118.TR is supplied in Cut Tape (CT) format. Selection depends on assembly process requirements and inventory management.

Q: Are there dimensional differences between Bel Fuse and SCHURTER parts?

A: Minor dimensional variations exist. Bel Fuse parts are specified as 0.217" Dia x 0.827" L (5.50mm x 21.00mm), while SCHURTER parts are specified as 0.213" Dia x 0.886" L (5.40mm x 22.50mm). Both fit the 5mm x 20mm (Axial) package classification and are mechanically compatible in standard through-hole fuse holders.

Q: Which approval certifications does each part carry?

A: 5STP 1.25-R carries CCC, CE, CSA, cURus, IMQ, SEMKO, VDE certifications. 5ETP 1.25-R carries CCC, CE, CSA, cULus, SEMKO, VDE certifications. 5TTP 1.25-R carries CE, CSA, cULus, PSE certifications. 0034.3118.PT and 0034.3118.TR carry cURus certification. Select based on regional compliance requirements.

Q: Can these parts be used interchangeably in all applications?

A: Yes, provided the application does not impose specific Breaking Capacity or Melting I²t requirements beyond the minimum values provided. All parts meet the core functional parameters for 1.25 A, 250 V AC/DC slow-blow circuit protection in 5mm x 20mm through-hole configurations.