Littelfuse 0218.630MXP Equivalent & Substitute Parts

Part Overview

The Littelfuse 0218.630MXP is a 630 mA, 250 V AC/DC slow-blow glass cartridge fuse in 5mm x 20mm form factor. This component is designed for circuit protection in applications requiring moderate current interruption with delayed response characteristics. The part is active in production with full international compliance certifications. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and design continuity across multiple manufacturers and series variants.

Key Parameters

Parameter	Value
Current Rating	630 mA
Voltage Rating (AC)	250 V
Voltage Rating (DC)	Not specified (AC/DC rated)
Response Time	Slow Blow
Package / Case	5mm x 20mm
Fuse Type	Cartridge, Glass
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	35 A
Melting I²t	4.675
Operating Temperature Range	-55°C to 125°C
DC Cold Resistance	0.275 Ohms
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following critical parameters:

Current Rating: 630 mA (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Mounting Type: Requires Holder (exact match required)
Response Time: Slow Blow (exact match required)

Substitute parts are grouped into three categories:

Direct Manufacturer Equivalents (Littelfuse Series 218): Parts 0218.630HXP and 0218.630TXP share identical electrical and mechanical specifications with the main part, differing only in approval agency certifications and manufacturing variants within the same product series.

Parametric Equivalents (Alternative Series): Parts 0213.630MXP (Littelfuse Series 213), 0034.3115 (SCHURTER FST 5x20), BK/S506-630-R (Eaton S506), TSC-630MA (OptiFuse TSC), and TSD-630MA (OptiFuse TSD) meet all critical electrical and mechanical parameters. Variations in melting I²t, breaking capacity, and approval agencies are noted but do not preclude functional substitution within the specified parameter envelope.

Manufacturer-Recommended Alternatives: Parts 0034.2514 (SCHURTER FSM 5x20) and 0034.3772 (SCHURTER FSL 5x20) are designated as manufacturer-recommended alternatives. These parts deviate from one or more critical parameters (response time classification, breaking capacity, or operating temperature range) and require engineering evaluation for specific applications.

Parameter Comparison

Part Number	Manufacturer	Series	Current (mA)	Voltage AC (V)	Response Time	Package	Breaking Capacity (A)	Melting I²t	Operating Temp (°C)	DC Resistance (Ω)
0218.630MXP	Littelfuse	218	630	250	Slow Blow	5x20mm	35	4.675	-55 to 125	0.275
0218.630HXP	Littelfuse	218	630	250	Slow Blow	5x20mm	35	4.675	-55 to 125	0.275
0218.630TXP	Littelfuse	218	630	250	Slow Blow	5x20mm	35	4.675	-55 to 125	0.275
0213.630MXP	Littelfuse	213	630	250	Slow Blow	5x20mm	35	4.8	-55 to 125	0.275
0034.3115	SCHURTER	FST 5x20	630	250	Slow Blow	5x20mm	35	4.35	-55 to 125	—
BK/S506-630-R	Eaton	S506	630	250	Slow Blow	5x20mm	35	1.33	—	0.186
TSC-630MA	OptiFuse	TSC	630	250	Slow Blow	5x20mm	100	0.566	-55 to 125	—
TSD-630MA	OptiFuse	TSD	630	250	Slow Blow	5x20mm	35	1.583	-55 to 125	—
0034.2514	SCHURTER	FSM 5x20	630	250	Medium Blow	5x20mm	80	0.905	-40 to 85	—
0034.3772	SCHURTER	FSL 5x20	630	250	Slow Blow	5x20mm	35	3.62	-40 to 85	—

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents): Parts 0218.630HXP and 0218.630TXP are direct functional equivalents within the Littelfuse 218 series. Both maintain identical electrical characteristics and operating parameters. Selection between these variants is determined by approval agency requirements specific to the end application. All three Littelfuse parts (0218.630MXP, 0218.630HXP, 0218.630TXP) carry comprehensive international certifications including CCC, CE, CSA, UL, and VDE.

Cross-Manufacturer Substitutes: Parts 0213.630MXP (Littelfuse 213 series), 0034.3115 (SCHURTER FST), TSD-630MA (OptiFuse TSD), and BK/S506-630-R (Eaton S506) satisfy all critical electrical and mechanical parameters. Melting I²t values vary across this group (ranging from 1.33 to 4.8), reflecting different thermal response profiles within the slow-blow classification. These parts are suitable for applications where the primary selection criteria are current rating, voltage rating, package form factor, and response time category. Approval agency coverage varies; SCHURTER 0034.3115 carries cURus and VDE certifications; Eaton BK/S506-630-R carries BSI, CCC, CSA, cULus, IMQ, SEMKO, and VDE certifications.

Higher Breaking Capacity Option: OptiFuse TSC-630MA provides 100 A breaking capacity compared to 35 A in the main part, with correspondingly lower melting I²t (0.566). This part is suitable for applications requiring enhanced fault current interruption capability while maintaining the 630 mA current rating and 250 V AC voltage rating.

Manufacturer-Recommended Alternatives (Conditional Use): SCHURTER 0034.2514 (FSM series, Medium Blow) and 0034.3772 (FSL series, Slow Blow) deviate from the main part specification. Part 0034.2514 features Medium Blow response time and reduced operating temperature range (-40°C to 85°C). Part 0034.3772 maintains Slow Blow response but operates within -40°C to 85°C. These parts are designated for applications where the narrower temperature range and alternative response characteristics are acceptable.

Frequently Asked Questions (FAQ)

Q: Can I substitute 0218.630HXP or 0218.630TXP directly for 0218.630MXP?

A: Yes. Both parts are direct equivalents within the Littelfuse 218 series with identical current rating (630 mA), voltage rating (250 V AC), response time (Slow Blow), package (5x20mm), and melting I²t (4.675). Selection is determined by approval agency requirements for your specific application.

Q: What is the difference between the Littelfuse 218 and 213 series?

A: Both series meet the critical electrical and mechanical parameters (630 mA, 250 V AC, Slow Blow, 5x20mm). The primary difference is melting I²t: Series 218 is 4.675 while Series 213 is 4.8. Approval agency coverage also differs slightly. Both are suitable for equivalent applications.

Q: Can I use OptiFuse TSC-630MA as a substitute?

A: TSC-630MA meets all critical parameters (630 mA, 250 V AC, Slow Blow, 5x20mm). However, it provides 100 A breaking capacity versus 35 A in the main part, with significantly lower melting I²t (0.566 versus 4.675). This part is suitable only if your application can accommodate the higher breaking capacity and faster thermal response within the slow-blow classification.

Q: What is the significance of melting I²t values?

A: Melting I²t determines the thermal energy required to melt the fuse element. Lower values indicate faster thermal response to overcurrent conditions. Variations in melting I²t across substitute parts reflect different thermal designs within the same response time category (Slow Blow). Application-specific thermal requirements determine acceptable variation ranges.

Q: Are SCHURTER 0034.2514 and 0034.3772 suitable replacements?

A: These parts are manufacturer-recommended alternatives but deviate from the main part specification. Part 0034.2514 uses Medium Blow response (versus Slow Blow) and operates within -40°C to 85°C (versus -55°C to 125°C). Part 0034.3772 maintains Slow Blow response but also operates within -40°C to 85°C. Use these parts only if your application requirements align with these parameter deviations.

Q: What approval agencies are most critical for my application?

A: Approval agency selection depends on your end-market and regulatory requirements. UL and cULus certifications are standard for North American applications. CE and VDE certifications are required for European markets. CCC certification is required for Chinese markets. Review your application's regulatory requirements and cross-reference the certification list for each substitute part.

Q: Can I mix different substitute parts in the same circuit?

A: All substitute parts within the primary equivalents group (0218.630MXP, 0218.630HXP, 0218.630TXP) are interchangeable. Cross-manufacturer substitutes should be evaluated individually based on melting I²t, breaking capacity, and approval agency requirements. Do not mix parts with different response time classifications (Slow Blow versus Medium Blow) in the same circuit without engineering review.

Q: What is the package form factor requirement?

A: All listed substitute parts use the 5mm x 20mm cartridge form factor and require a fuse holder for mounting. This package is standardized across all manufacturers listed. Mechanical compatibility with your fuse holder is confirmed by the identical 5x20mm specification.

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