5STP 400-R Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The 5STP 400-R is a 400 mA, 250 V AC/DC slow-blow glass cartridge fuse manufactured by Bel Fuse Inc. in a 5mm x 20mm through-hole package. This component is classified as Active product status and is widely used in electronic equipment requiring overcurrent protection with slow-blow response characteristics. Equivalent and substitute parts are necessary to ensure design flexibility, supply chain continuity, and compatibility across different manufacturing sources while maintaining identical electrical and mechanical performance.

Key Parameters

Parameter	Value
Current Rating	400 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	5mm x 20mm (Axial)
Mounting Type	Through Hole
Operating Temperature Range	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the 5STP 400-R is determined by strict equivalence across the following critical parameters:

Current Rating: 400 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 (Axial) (exact match required)
Mounting Type: Through Hole (exact match required)

All substitute parts listed below meet these criteria. Variations in secondary parameters such as Breaking Capacity, Melting I²t, DC Cold Resistance, and dimensional tolerances do not prevent functional substitution when the primary electrical and mechanical parameters are identical.

Parameter Comparison

Parameter	5STP 400-R (Bel Fuse)	5TTP 400-R (Bel Fuse)	0034.3113.PT (SCHURTER)	BK/S506-V-400-R (Eaton)
Manufacturer	Bel Fuse Inc.	Bel Fuse Inc.	SCHURTER Inc.	Eaton - Electronics Division
Current Rating (Amps)	400 mA	400 mA	400 mA	400 mA
Voltage Rating - AC	250 V	250 V	250 V	250 V
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow Blow
Package / Case	5mm x 20mm (Axial)	5mm x 20mm (Axial)	5mm x 20mm (Axial)	5mm x 20mm (Axial)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	Not specified
Breaking Capacity @ Rated Voltage	35 A	100 A	35 A	35 A
Melting I²t	0.81	1.65	0.768	0.872
DC Cold Resistance (Ohms)	0.82	1.45	Not specified	0.31
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

All four parts listed are Active product status components with ROHS3 compliance, ensuring regulatory alignment and ongoing availability. Selection among these equivalents should be based on:

Approval Agency requirements: The 5STP 400-R and BK/S506-V-400-R offer the broadest certification coverage (CCC, CE, CSA, cULus, IMQ, SEMKO, VDE for 5STP; BSI, CCC, CSA, IMQ, SEMKO, UR, VDE for BK/S506-V-400-R). The 5TTP 400-R carries CE, CSA, and cULus certifications. The 0034.3113.PT carries cURus certification.
Supply chain availability: Inventory levels vary across manufacturers. Current stock includes 1634 pcs (5STP 400-R), 1858 pcs (5TTP 400-R), 3845 pcs (0034.3113.PT), and 791 pcs (BK/S506-V-400-R).
Dimensional tolerance: The 0034.3113.PT exhibits slightly different dimensions (5.40mm Dia x 22.50mm L) compared to the nominal 5mm x 20mm specification. Verify mechanical fit in constrained applications.
Secondary electrical parameters: Breaking Capacity and Melting I²t values differ among substitutes. The 5TTP 400-R provides higher Breaking Capacity (100 A) and Melting I²t (1.65) compared to the main part (35 A, 0.81). The BK/S506-V-400-R offers lower DC Cold Resistance (0.31 Ohms) compared to the 5STP 400-R (0.82 Ohms).

Frequently Asked Questions (FAQ)

Q: Can the 5TTP 400-R be used as a direct replacement for the 5STP 400-R?

A: Yes. Both parts share identical current rating (400 mA), voltage rating (250 V AC), fuse type (Cartridge, Glass), response time (Slow Blow), package (5mm x 20mm), and mounting type (Through Hole). The 5TTP 400-R is a parametric equivalent. Secondary differences in Breaking Capacity and Melting I²t do not prevent functional substitution.

Q: What is the difference between the 5STP 400-R and 0034.3113.PT?

A: Both are functionally equivalent across all primary electrical and mechanical parameters. The 0034.3113.PT is manufactured by SCHURTER Inc. and exhibits slightly different dimensions (5.40mm Dia x 22.50mm L versus the nominal 5mm x 20mm). Verify mechanical fit in applications with tight spatial constraints.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All four parts listed (5STP 400-R, 5TTP 400-R, 0034.3113.PT, and BK/S506-V-400-R) are ROHS3 compliant.

Q: Which substitute part has the highest Breaking Capacity?

A: The 5TTP 400-R offers the highest Breaking Capacity at 100 A, compared to 35 A for the 5STP 400-R, 0034.3113.PT, and BK/S506-V-400-R.

Q: Can I use these parts interchangeably in all applications?

A: All listed parts meet the primary electrical and mechanical substitution criteria. However, verify compliance with specific approval agency requirements for your application. The 5STP 400-R and BK/S506-V-400-R carry broader certification coverage than the 5TTP 400-R and 0034.3113.PT.

Q: What is the operating temperature range for all substitute parts?

A: The 5STP 400-R, 5TTP 400-R, and 0034.3113.PT are rated for -55°C ~ 125°C. The BK/S506-V-400-R operating temperature is not specified in the provided data.

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