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

Part Overview

The Littelfuse 0218.400VXP is a 400mA 250VAC slow-blow glass cartridge fuse in 5x20mm form factor, designed for circuit protection in AC/DC applications. This Active product requires a fuse holder for installation and is RoHS3 compliant with multiple international certifications including UL, CE, CSA, and VDE. 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 circuits.

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
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for the 0218.400VXP is determined by the following critical parameters:

Primary Matching Criteria:

Current Rating: 400 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)
Response Time: Slow Blow (exact match required)
Mounting Type: Requires Holder (exact match required)

Secondary Compatibility Factors:

Breaking Capacity @ Rated Voltage: 35A minimum
Operating Temperature Range: -55°C ~ 125°C minimum
Approval Agency certifications: UL, CE, CSA, VDE preferred for regulatory alignment
RoHS3 Compliance: Required for environmental standards

All substitute parts listed meet or exceed these criteria and are confirmed Active products with current inventory availability.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Series	Current Rating	Voltage Rating (AC)	Response Time	Package / Case	Breaking Capacity @ Rated Voltage	Melting I²t	Operating Temperature	Approval Agency	Inventory (Pcs)
0218.400VXP	Littelfuse Inc.	218	400 mA	250 V	Slow Blow	5mm x 20mm	35A	1.325	-55°C ~ 125°C	CCC, CE, CSA, KC, SEMKO, UL, VDE	725
0213.400MXP	Littelfuse	213	400 mA	250 V	Slow Blow	5mm x 20mm	35A	1.36	-55°C ~ 125°C	BSI, CCC, CE, CSA, SEMKO, UR, VDE	1252
0218.400HXP	Littelfuse Inc.	218	400 mA	250 V	Slow Blow	5mm x 20mm	35A	1.325	-55°C ~ 125°C	CCC, CE, CSA, K-MARK, SEMKO, UL, VDE	4283
0218.400MXP	Littelfuse Inc.	218	400 mA	250 V	Slow Blow	5mm x 20mm	35A	1.325	-55°C ~ 125°C	CCC, CE, CSA, K-MARK, SEMKO, UL, VDE	3680
0219.400MXAP	Littelfuse Inc.	219XA	400 mA	250 V	Slow Blow	5mm x 20mm	150A	1.4	-55°C ~ 125°C	CCC, CE, CSA, SEMKO, UL, VDE	1691
0239.400HXP	Littelfuse Inc.	239	400 mA	250 V	Slow Blow	5mm x 20mm	35A	1.49	-55°C ~ 125°C	CE, CSA, KC, UL	899
0239.400MXP	Littelfuse Inc.	239	400 mA	250 V	Slow Blow	5mm x 20mm	35A	1.49	-55°C ~ 125°C	CE, CSA, KC, UL	2059
0034.3113	SCHURTER Inc.	FST 5x20	400 mA	250 V	Slow Blow	5mm x 20mm	35A	0.768	-55°C ~ 125°C	CCC, cURus, VDE	2229
0034.5613.11	SCHURTER Inc.	SMD-FST	400 mA	250 V	Slow Blow	5mm x 20mm	35A	0.768	-55°C ~ 125°C	cURus, VDE	1828
TSC-400MA	OptiFuse	TSC	400 mA	250 V	Slow Blow	5mm x 20mm	100A	1.2604	-55°C ~ 125°C	cULus, UL 248	2439
TSD-400MA	OptiFuse	TSD	400 mA	250 V	Slow Blow	5mm x 20mm	35A	0.7968	-55°C ~ 125°C	IEC 60127	4031

Engineering Selection Recommendations

Littelfuse Series 218 (0218.400HXP, 0218.400MXP): Direct equivalents within the same manufacturer series. Both parts share identical electrical specifications and melting I²t characteristics with the 0218.400VXP. Full UL, CE, CSA, and VDE certification alignment. Highest inventory availability (4283 and 3680 units respectively) supports supply chain continuity.

Littelfuse Series 213 (0213.400MXP): Parametric equivalent with marginally higher melting I²t (1.36 vs 1.325). Maintains all critical electrical and mechanical parameters. Includes BSI and UR certifications in addition to standard approvals. Suitable for applications requiring extended thermal margin.

Littelfuse Series 219XA (0219.400MXAP): Enhanced breaking capacity variant (150A vs 35A). Electrical and thermal characteristics compatible with base specification. Recommended for circuits requiring higher fault current withstand capability while maintaining identical current and voltage ratings.

Littelfuse Series 239 (0239.400HXP, 0239.400MXP): Parametric equivalents with higher melting I²t (1.49). Reduced approval agency coverage (CE, CSA, KC, UL) compared to 0218.400VXP. Suitable for applications where UL and VDE certifications are not mandatory requirements.

SCHURTER FST 5x20 (0034.3113): Cross-manufacturer equivalent from established supplier. Significantly lower melting I²t (0.768) indicates faster thermal response. CCC, cURus, and VDE certifications present. Suitable for applications tolerating tighter thermal margins.

SCHURTER SMD-FST (0034.5613.11): Parametric equivalent with identical melting I²t to 0034.3113 (0.768). Limited certification scope (cURus, VDE only). Recommended only where UL and CE certifications are not required.

OptiFuse TSC-400MA: Cross-manufacturer option with elevated breaking capacity (100A). Melting I²t (1.2604) falls between standard and enhanced variants. cULus and UL 248 certifications support North American applications. Suitable for circuits requiring higher fault current protection.

OptiFuse TSD-400MA: Cross-manufacturer equivalent with lowest melting I²t (0.7968) among all substitutes. IEC 60127 certification indicates international standards compliance. Highest inventory availability (4031 units). Recommended for cost-optimized procurement where IEC compliance is acceptable.

Frequently Asked Questions (FAQ)

Q: Can I substitute 0218.400VXP with any of the listed parts?

A: All listed parts meet the core electrical and mechanical requirements (400mA, 250VAC, 5x20mm, slow-blow, cartridge glass). However, verify that your application's certification requirements align with the substitute part's approval agencies. For example, if UL certification is mandatory, avoid 0034.5613.11 (cURus, VDE only).

Q: What is the significance of melting I²t values in the comparison table?

A: Melting I²t indicates the thermal energy required to melt the fuse element. Lower values (0.768 for SCHURTER parts) mean faster response to overcurrent. Higher values (1.49 for Series 239) provide greater tolerance to transient current spikes. Select based on your circuit's inrush current characteristics and protection speed requirements.

Q: Are Littelfuse Series 218 and 213 interchangeable?

A: Yes. Both share identical current rating (400mA), voltage rating (250VAC), package (5x20mm), and response time (slow-blow). The 0213.400MXP has marginally higher melting I²t (1.36 vs 1.325), making it suitable for applications with slightly higher transient current tolerance.

Q: Why does 0219.400MXAP have a higher breaking capacity (150A vs 35A)?

A: Breaking capacity indicates the maximum fault current the fuse can safely interrupt without rupturing the cartridge. The 0219.400MXAP is engineered for circuits with higher available fault current. This does not affect its 400mA current rating or 250VAC voltage rating. Use this variant only if your circuit's fault current exceeds 35A.

Q: Can I use OptiFuse TSD-400MA in place of Littelfuse 0218.400VXP?

A: Electrically and mechanically, yes. The TSD-400MA meets all core specifications. However, it carries IEC 60127 certification rather than UL/CE/CSA. Verify that your application or regional standards accept IEC 60127 compliance. The lower melting I²t (0.7968) means faster thermal response, which may affect circuit behavior if the original design relied on the Littelfuse thermal characteristics.

Q: What is the difference between SCHURTER 0034.3113 and 0034.5613.11?

A: Both are SCHURTER 400mA 250VAC 5x20mm slow-blow fuses with identical melting I²t (0.768). The primary difference is certification scope: 0034.3113 includes CCC certification, while 0034.5613.11 does not. Select 0034.3113 if CCC compliance is required for your market.

Q: Does package size affect fuse holder compatibility?

A: No. All substitute parts use the standard 5mm x 20mm cartridge form factor and require a fuse holder for installation, identical to the 0218.400VXP. Existing fuse holders are compatible with all listed substitutes.

Q: Which substitute offers the best inventory availability?

A: OptiFuse TSD-400MA has the highest inventory (4031 units), followed by Littelfuse 0218.400HXP (4283 units). For immediate procurement, these options provide the shortest lead times.

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