5STP 400 Glass Cartridge Fuse - Equivalent & Substitute Parts

Part Overview

The 5STP 400 is a 400 mA, 250 V AC/DC slow-blow glass cartridge fuse in 5mm x 20mm (axial) through-hole package manufactured by Bel Fuse Inc. This part is classified as obsolete. Equivalent and substitute parts are available from active product lines, offering improved compliance and availability while maintaining electrical and mechanical compatibility within specified parameters.

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
Breaking Capacity @ Rated Voltage	35 A

Substitute Part Grouping Explanation

Substitution is determined by matching the following critical parameters:

Current Rating: 400 mA (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 (minimum requirement)

Parts are grouped into two categories:

Direct Equivalents: Parts meeting all critical parameters with identical electrical characteristics (Breaking Capacity, Melting I²t, DC Cold Resistance).

Parametric Equivalents: Parts meeting all critical parameters with variations in secondary electrical characteristics (Breaking Capacity, Melting I²t, DC Cold Resistance) that do not affect functional compatibility in standard applications.

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage Rating (AC)	Response Time	Package / Case	Breaking Capacity @ Rated Voltage	Melting I²t	DC Cold Resistance (Ohms)	Product Status	RoHS Status
5STP 400	Bel Fuse Inc.	400 mA	250 V	Slow Blow	5mm x 20mm	35 A	0.81	0.82	Obsolete	RoHS non-compliant
5STP 400-R	Bel Fuse Inc.	400 mA	250 V	Slow Blow	5mm x 20mm	35 A	0.81	0.82	Active	ROHS3 Compliant
5TTP 400-R	Bel Fuse Inc.	400 mA	250 V	Slow Blow	5mm x 20mm	100 A	1.65	1.45	Active	ROHS3 Compliant
0034.3113.PT	SCHURTER Inc.	400 mA	250 V	Slow Blow	5mm x 20mm	35 A	0.768	Not specified	Active	ROHS3 Compliant
0218.400MXEP	Littelfuse Inc.	400 mA	250 V	Slow Blow	5mm x 20mm	35 A	1.325	0.535	Active	ROHS3 Compliant

Engineering Selection Recommendations

5STP 400-R (Bel Fuse Inc.): Direct equivalent with identical electrical characteristics. Active product status with ROHS3 compliance. Recommended as primary replacement for obsolete 5STP 400. Certifications include CCC, CE, CSA, cULus, IMQ, SEMKO, VDE.

5TTP 400-R (Bel Fuse Inc.): Parametric equivalent with higher breaking capacity (100 A vs. 35 A) and increased melting I²t (1.65 vs. 0.81). Active product status with ROHS3 compliance. Suitable where higher fault current withstand capability is required. Certifications include CE, CSA, cULus.

0034.3113.PT (SCHURTER Inc.): Direct equivalent with matching breaking capacity (35 A) and comparable melting I²t (0.768 vs. 0.81). Active product status with ROHS3 compliance. Certifications include cURus. Physical dimensions vary slightly (5.40mm x 22.50mm vs. 5.50mm x 21.00mm).

0218.400MXEP (Littelfuse Inc.): Direct equivalent with matching breaking capacity (35 A). Active product status with ROHS3 compliance. Certifications include CCC, CE, CSA, K-MARK, SEMKO, UL, VDE. Physical dimensions vary (5.80mm x 22.50mm vs. 5.50mm x 21.00mm).

0034.3123.PT (SCHURTER Inc.): Not recommended. Current rating is 4 A, not 400 mA. Incompatible with 5STP 400 application requirements.

Frequently Asked Questions (FAQ)

Q: Can 5STP 400-R directly replace 5STP 400? A: Yes. 5STP 400-R is a direct equivalent with identical current rating (400 mA), voltage rating (250 V), response time (slow blow), package (5mm x 20mm), and electrical characteristics (Breaking Capacity 35 A, Melting I²t 0.81, DC Cold Resistance 0.82 Ohms). The primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant).

Q: What is the difference between 5STP 400-R and 5TTP 400-R? A: Both are 400 mA, 250 V slow-blow fuses in 5mm x 20mm packages. The 5TTP 400-R has higher breaking capacity (100 A vs. 35 A), higher melting I²t (1.65 vs. 0.81), and higher DC cold resistance (1.45 vs. 0.82 Ohms). Select 5TTP 400-R only if higher fault current withstand capability is required.

Q: Are SCHURTER and Littelfuse equivalents mechanically compatible? A: Both SCHURTER 0034.3113.PT and Littelfuse 0218.400MXEP meet the 5mm x 20mm package specification. However, physical dimensions vary slightly: SCHURTER is 5.40mm x 22.50mm and Littelfuse is 5.80mm x 22.50mm, compared to the original 5.50mm x 21.00mm. Verify mechanical fit in the target application before substitution.

Q: Which substitute has the broadest certification coverage? A: Littelfuse 0218.400MXEP includes CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE certifications. Bel Fuse 5STP 400-R includes CCC, CE, CSA, cULus, IMQ, SEMKO, and VDE certifications. Select based on required certifications for your application region.

Q: Is 0034.3123.PT a valid substitute? A: No. 0034.3123.PT has a current rating of 4 A, not 400 mA. This part is not electrically compatible with the 5STP 400 application.

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