Littelfuse 0218.400TXP Glass Cartridge Fuse 400mA 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 0218.400TXP is a 400mA 250VAC slow-blow glass cartridge fuse in 5x20mm form factor, designed for circuit protection in AC/DC applications requiring holder-based installation. This Active product is manufactured by Littelfuse Inc. and carries multiple international certifications including UL, CE, CSA, CCC, VDE, KC, and SEMKO. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, response characteristics, and approval agency compliance to ensure direct functional interchangeability in protected circuit designs.

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
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	35A
Operating Temperature Range	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 0218.400TXP is determined by strict equivalence across the following parameters: 400mA current rating, 250V AC voltage rating, slow-blow response characteristic, 5x20mm physical dimensions, and holder-based mounting requirement. All substitute parts listed maintain these core electrical and mechanical specifications. Variations in breaking capacity, melting I²t values, DC cold resistance, and approval agency certifications are noted but do not preclude functional substitution when application requirements align with the substitute part's documented specifications. Parts are grouped by manufacturer and series to facilitate procurement and inventory management.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating	Voltage Rating (AC)	Response Time	Package	Breaking Capacity @ Rated Voltage	Melting I²t	DC Cold Resistance (Ohms)	Approval Agencies
0218.400TXP	Littelfuse Inc.	218	400 mA	250 V	Slow Blow	5x20mm	35A	1.325	0.535	CCC, CE, CSA, KC, SEMKO, UL, VDE
0213.400MXP	Littelfuse	213	400 mA	250 V	Slow Blow	5x20mm	35A	1.36	0.535	BSI, CCC, CE, CSA, SEMKO, UR, VDE
0218.400HXP	Littelfuse Inc.	218	400 mA	250 V	Slow Blow	5x20mm	35A	1.325	0.535	CCC, CE, CSA, K-MARK, SEMKO, UL, VDE
0218.400MXP	Littelfuse Inc.	218	400 mA	250 V	Slow Blow	5x20mm	35A	1.325	0.535	CCC, CE, CSA, K-MARK, SEMKO, UL, VDE
0219.400MXAP	Littelfuse Inc.	219XA	400 mA	250 V	Slow Blow	5x20mm	150A	1.4	0.535	CCC, CE, CSA, SEMKO, UL, VDE
0239.400HXP	Littelfuse Inc.	239	400 mA	250 V	Slow Blow	5x20mm	35A	1.49	1.475	CE, CSA, KC, UL
0239.400MXP	Littelfuse Inc.	239	400 mA	250 V	Slow Blow	5x20mm	35A	1.49	1.475	CE, CSA, KC, UL
0034.3113	SCHURTER Inc.	FST 5x20	400 mA	250 V	Slow Blow	5x20mm	35A	0.768	Not Specified	CCC, cURus, VDE
0034.5613.11	SCHURTER Inc.	SMD-FST	400 mA	250 V	Slow Blow	5x20mm	35A	0.768	Not Specified	cURus, VDE
TSC-400MA	OptiFuse	TSC	400 mA	250 V	Slow Blow	5x20mm	100A	1.2604	Not Specified	cULus, UL 248
TSD-400MA	OptiFuse	TSD	400 mA	250 V	Slow Blow	5x20mm	35A	0.7968	Not Specified	IEC 60127

Engineering Selection Recommendations

All listed substitute parts maintain the core electrical specifications of 400mA at 250VAC with slow-blow response in 5x20mm form factor. Selection among equivalents should prioritize alignment with application-specific approval agency requirements. Littelfuse series 218 and 219XA parts (0218.400TXP, 0218.400HXP, 0218.400MXP, 0219.400MXAP) provide comprehensive certification coverage including UL, CE, CSA, CCC, and VDE, suitable for global market applications. Littelfuse series 213 (0213.400MXP) and 239 (0239.400HXP, 0239.400MXP) offer alternative certification profiles with reduced agency coverage. SCHURTER FST series (0034.3113, 0034.5613.11) provide VDE and cURus compliance with lower melting I²t characteristics. OptiFuse TSC and TSD series deliver IEC 60127 or UL 248 compliance with varying breaking capacity ratings. Breaking capacity differences (35A, 100A, or 150A) and melting I²t variations should be evaluated against circuit protection requirements and fault current expectations in the target application.

Frequently Asked Questions (FAQ)

Q: Can 0218.400HXP or 0218.400MXP be used as direct replacements for 0218.400TXP?

A: Yes. Both parts are Littelfuse series 218 fuses with identical 400mA, 250VAC, slow-blow, 5x20mm specifications and 35A breaking capacity. Certification differences (K-MARK addition) do not affect functional interchangeability in applications requiring standard UL, CE, CSA, CCC, VDE, or SEMKO compliance.

Q: What is the difference between Littelfuse 0219.400MXAP and 0218.400TXP?

A: The 0219.400MXAP differs in breaking capacity (150A versus 35A) and melting I²t (1.4 versus 1.325). Both maintain 400mA, 250VAC, slow-blow, 5x20mm specifications. The higher breaking capacity of 0219.400MXAP suits applications with elevated fault current levels.

Q: Are SCHURTER and OptiFuse parts compatible with Littelfuse holders?

A: All substitute parts maintain identical 5x20mm physical dimensions and holder-based mounting requirement. Mechanical compatibility with existing fuse holders is assured. Electrical performance differences in melting I²t and breaking capacity must be evaluated against circuit design specifications.

Q: Why do some parts list lower melting I²t values?

A: Melting I²t variations reflect differences in fuse element design and thermal characteristics between manufacturers. SCHURTER FST series (0.768) and OptiFuse TSD series (0.7968) exhibit faster thermal response compared to Littelfuse series 218 (1.325). Selection should align with circuit protection coordination requirements and overcurrent response timing.

Q: Which substitute part offers the broadest certification coverage?

A: Littelfuse 0218.400HXP and 0218.400MXP provide comprehensive multi-agency certification (CCC, CE, CSA, K-MARK, SEMKO, UL, VDE), matching or exceeding the original 0218.400TXP certification profile and supporting global market deployment.

Q: Can OptiFuse TSC-400MA be used where TSC-400MA breaking capacity (100A) exceeds application requirements?

A: Yes. Higher breaking capacity does not compromise protection in circuits with lower fault current. The 100A breaking capacity of TSC-400MA provides additional margin in applications where fault current may increase or where circuit topology changes are anticipated.

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