5STP 630 Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The 5STP 630 is a 630 mA, 250 V AC/DC glass cartridge fuse manufactured by Bel Fuse Inc. in a 5mm x 20mm axial through-hole package with slow-blow response characteristics. This part is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations. Direct functional equivalents are available from multiple manufacturers with active product status and improved compliance certifications.

Key Parameters

Parameter	Value
Current Rating	630 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm (Axial)
Response Time	Slow Blow
Mounting Type	Through Hole
Breaking Capacity @ Rated Voltage	35A
Operating Temperature Range	-55°C ~ 125°C

Substitute Part Grouping Explanation

Substitution eligibility for the 5STP 630 is determined by strict equivalence across the following parameters: current rating (630 mA), voltage rating (250 V AC), fuse type (cartridge glass), package dimensions (5mm x 20mm axial), response time (slow blow), and operating temperature range (-55°C ~ 125°C). All identified substitutes meet these core electrical and mechanical requirements. Variations in melting I²t, DC cold resistance, and dimensional tolerances within the specified package class do not preclude functional substitution. Approval agency certifications and RoHS compliance status are secondary selection criteria based on application requirements.

Parameter Comparison

Parameter	5STP 630	5STP 630-R	0034.3115.PT	0218.630MXEP
Manufacturer	Bel Fuse Inc.	Bel Fuse Inc.	SCHURTER Inc.	Littelfuse Inc.
Current Rating (Amps)	630 mA	630 mA	630 mA	630 mA
Voltage Rating - AC	250 V	250 V	250 V	250 V
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Package / Case	5mm x 20mm (Axial)	5mm x 20mm (Axial)	5mm x 20mm (Axial)	5mm x 20mm (Axial)
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow Blow
Breaking Capacity @ Rated Voltage	35A	35A	35A	35A
Melting I²t	0.9	0.9	4.35	4.675
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
DC Cold Resistance (Ohms)	0.22	0.22	Not specified	0.275
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For applications requiring direct replacement of the obsolete 5STP 630, the 5STP 630-R from Bel Fuse Inc. is the primary equivalent. This part maintains identical electrical specifications, mechanical package, and DC cold resistance while offering active product status and ROHS3 compliance. The 5STP 630-R is suitable for designs requiring continuity with the original Bel Fuse platform.

The 0034.3115.PT (SCHURTER Inc., FST 5x20 series) and 0218.630MXEP (Littelfuse Inc., 218 series) are functionally equivalent alternatives. Both parts meet all core electrical and mechanical requirements with active product status and ROHS3 compliance. The 0218.630MXEP offers the broadest approval agency coverage (CCC, CE, CSA, K-MARK, SEMKO, UL, VDE), making it suitable for applications with stringent international certification requirements. The 0034.3115.PT is appropriate for designs prioritizing cURus certification compliance.

Melting I²t variations (0.9 for 5STP 630-R versus 4.35 for 0034.3115.PT and 4.675 for 0218.630MXEP) reflect different thermal response profiles within the slow-blow classification. Selection should account for circuit protection requirements specific to the application.

Frequently Asked Questions (FAQ)

Q: Can the 5STP 630-R directly replace the obsolete 5STP 630?

A: Yes. The 5STP 630-R is a direct equivalent with identical current rating (630 mA), voltage rating (250 V AC), package dimensions (5mm x 20mm), response time (slow blow), and DC cold resistance (0.22 Ohms). Both are manufactured by Bel Fuse Inc. The primary difference is product status (active versus obsolete) and RoHS compliance (ROHS3 versus non-compliant).

Q: What is the significance of melting I²t differences between substitute parts?

A: Melting I²t defines the thermal energy required to melt the fuse element. The 5STP 630-R has a melting I²t of 0.9, while the 0034.3115.PT and 0218.630MXEP have values of 4.35 and 4.675 respectively. All parts are classified as slow-blow fuses and meet the 35A breaking capacity specification. Selection should be based on circuit protection requirements and thermal response characteristics needed for the specific application.

Q: Are all substitute parts mechanically compatible with the original 5mm x 20mm footprint?

A: All substitute parts are specified for the 5mm x 20mm (axial) package class. Minor dimensional variations exist within manufacturing tolerances: the 5STP 630 and 5STP 630-R are 0.217" diameter x 0.827" length; the 0034.3115.PT is 0.213" diameter x 0.886" length; the 0218.630MXEP is 0.228" diameter x 0.886" length. These variations remain within the 5mm x 20mm package specification and do not affect through-hole mounting compatibility.

Q: Which substitute part has the most comprehensive international certifications?

A: The 0218.630MXEP (Littelfuse Inc.) carries the broadest approval agency coverage: CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE. The 5STP 630-R includes CCC, CE, CSA, cULus, IMQ, SEMKO, and VDE. The 0034.3115.PT carries cURus certification. Selection should align with the specific regulatory requirements of the target application and market.

Q: Is RoHS compliance a mandatory selection criterion?

A: RoHS compliance is application-dependent. The 5STP 630-R, 0034.3115.PT, and 0218.630MXEP are all ROHS3 compliant, making them suitable for applications subject to RoHS regulations. The original 5STP 630 is RoHS non-compliant. For new designs or applications in regulated markets, ROHS3-compliant substitutes are required.

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