Equivalent & Substitute Parts for 5STP 8

Part Overview

The 5STP 8 is an 8 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 classified as obsolete, making identification of active equivalent and substitute parts essential for ongoing system support and procurement planning. Substitute parts must maintain identical electrical ratings, mechanical dimensions, and functional characteristics to ensure direct interchangeability in through-hole applications.

Substiute Parts

5STP 8

Bel Fuse Inc.In Stock: 7515STP 8 Datasheet

Current PartRFQ

5STP 8-R

Bel Fuse Inc.In Stock: 19425STP 8-R Datasheet

DirectRFQ

5ETP 8-R

Bel Fuse Inc.In Stock: 17015ETP 8-R Datasheet

Parametric EquivalentRFQ

0034.3126.PT

SCHURTER Inc.In Stock: 46930034.3126.PT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 5STP 8 is determined by strict equivalence across the following critical parameters:

• Current Rating: 8 A (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 (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 criteria. Variations in breaking capacity, melting I²t, DC cold resistance, and dimensional tolerances within the specified package class do not preclude substitution, as these parameters remain within acceptable engineering margins for the 5mm x 20mm cartridge fuse category.

Parameter Comparison

Engineering Selection Recommendations

5STP 8-R (Bel Fuse Inc.) is the primary direct substitute. It maintains identical electrical and mechanical specifications to the 5STP 8 while offering active product status and ROHS3 compliance. Approval certifications include CE, CSA, and cULus, providing broad regulatory coverage. This part is recommended for applications requiring direct form-fit-function replacement with enhanced compliance posture.

5ETP 8-R (Bel Fuse Inc.) is a parametric equivalent offering higher breaking capacity (150 A versus 80 A) and marginally lower melting I²t (252 versus 260). This part is suitable for applications where enhanced fault current handling is beneficial. ROHS3 compliance and CE/SEMKO certifications are provided. The 5ETP series represents an upgraded alternative within the Bel Fuse portfolio.

0034.3126.PT (SCHURTER Inc.) is a cross-manufacturer substitute from the FST 5x20 series. It maintains all critical electrical parameters and operates within the same temperature range. Dimensional tolerance is slightly different (5.40mm x 22.50mm versus 5.50mm x 21.00mm), remaining within acceptable mechanical clearance for standard 5mm x 20mm fuse holders. ROHS3 compliance and cURus certification are provided. This part offers supply diversity from an alternative manufacturer.

Frequently Asked Questions (FAQ)

Q: Can 5STP 8-R be used as a direct replacement for 5STP 8?

A: Yes. The 5STP 8-R maintains identical current rating (8 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 primary difference is product status (active versus obsolete) and enhanced RoHS3 compliance.

Q: What is the difference between 5STP 8-R and 5ETP 8-R?

A: Both parts share identical electrical ratings and mechanical form factor. The 5ETP 8-R offers higher breaking capacity (150 A versus 80 A) and slightly lower melting I²t (252 versus 260). Selection between these parts depends on application fault current requirements. Both are manufactured by Bel Fuse Inc. and are ROHS3 compliant.

Q: Can SCHURTER 0034.3126.PT be used interchangeably with Bel Fuse parts?

A: Yes, with dimensional consideration. The 0034.3126.PT maintains all critical electrical specifications and operates within the same temperature range. Dimensional tolerance is 5.40mm x 22.50mm versus the standard 5.50mm x 21.00mm. This minor variation remains within acceptable mechanical clearance for standard 5mm x 20mm fuse holders, enabling cross-manufacturer substitution.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The 5STP 8-R, 5ETP 8-R, and 0034.3126.PT are all ROHS3 compliant. The original 5STP 8 is RoHS non-compliant, making these substitutes necessary for applications requiring RoHS compliance.

Q: What certifications do these substitute parts carry?

A: 5STP 8-R carries CE, CSA, and cULus certifications. 5ETP 8-R carries CE and SEMKO certifications. 0034.3126.PT carries cURus certification. Selection should be based on specific regulatory requirements for the target application.