Littelfuse 0618.400MXP Glass Cartridge Fuse 400mA 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 0618.400MXP is a 400 mA, 250 V AC/DC slow-blow glass cartridge fuse in 5mm x 20mm form factor. This component requires a fuse holder for installation and is designed for circuit protection in industrial and commercial applications. The part is active in production with 1143 units currently in stock. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, response characteristics, and approval certifications to ensure direct functional interchangeability in circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	400 mA
Voltage Rating (AC)	250 V
Response Time	Slow Blow
Package / Case	5mm x 20mm
Fuse Type	Cartridge, Glass
Mounting Type	Requires Holder
Operating Temperature Range	-55°C to 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 0618.400MXP are grouped based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

Current Rating: 400 mA (exact match required)
Voltage Rating: 250 V AC (exact match required)
Package Dimensions: 5mm x 20mm (exact match required)
Response Time: Slow Blow (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Operating Temperature: -55°C to 125°C (exact match required)

Secondary Considerations:

Breaking Capacity at Rated Voltage (35A baseline; higher values acceptable)
Melting I²t characteristics (minor variations acceptable within slow-blow classification)
DC Cold Resistance (minor variations acceptable)
Approval Certifications (CCC, CE, CSA, UL, VDE, and regional certifications)

All listed substitute parts meet the primary matching criteria. Variations in breaking capacity, melting I²t, and certifications do not affect functional interchangeability in standard circuit protection applications.

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage (AC)	Response Time	Package	Breaking Capacity @ Rated Voltage	Melting I²t	DC Cold Resistance (Ω)	Inventory (Pcs)
0618.400MXP	Littelfuse Inc.	400 mA	250 V	Slow Blow	5x20mm	35A	1.325	0.535	1143
0213.400MXP	Littelfuse	400 mA	250 V	Slow Blow	5x20mm	35A	1.36	0.535	1252
0218.400HXP	Littelfuse Inc.	400 mA	250 V	Slow Blow	5x20mm	35A	1.325	0.535	4283
0218.400MXP	Littelfuse Inc.	400 mA	250 V	Slow Blow	5x20mm	35A	1.325	0.535	3680
0219.400MXAP	Littelfuse Inc.	400 mA	250 V	Slow Blow	5x20mm	150A	1.4	0.535	1691
0239.400HXP	Littelfuse Inc.	400 mA	250 V	Slow Blow	5x20mm	35A	1.49	1.475	899
0239.400MXP	Littelfuse Inc.	400 mA	250 V	Slow Blow	5x20mm	35A	1.49	1.475	2059
0034.3113	SCHURTER Inc.	400 mA	250 V	Slow Blow	5x20mm	35A	0.768	—	2229
0034.5613.11	SCHURTER Inc.	400 mA	250 V	Slow Blow	5x20mm	35A	0.768	—	1828
TSC-400MA	OptiFuse	400 mA	250 V	Slow Blow	5x20mm	100A	1.2604	—	2439
TSD-400MA	OptiFuse	400 mA	250 V	Slow Blow	5x20mm	35A	0.7968	—	4031

Engineering Selection Recommendations

Littelfuse Series 218 (0218.400HXP, 0218.400MXP): Highest inventory availability (4283 and 3680 units respectively) with identical electrical and thermal characteristics to the primary part. Both carry comprehensive international certifications including CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE. These are the preferred substitutes for immediate availability.

Littelfuse Series 219XA (0219.400MXAP): Offers elevated breaking capacity of 150A compared to the 35A baseline, providing enhanced protection margin in high-fault-current environments. Certifications include CCC, CE, CSA, SEMKO, and UL. Suitable for applications requiring higher fault tolerance.

Littelfuse Series 213 (0213.400MXP): Functionally equivalent with 1252 units in stock. Carries broader certification coverage including BSI and SEMKO in addition to standard approvals. Melting I²t of 1.36 is marginally higher than the primary part.

Littelfuse Series 239 (0239.400HXP, 0239.400MXP): Both variants carry 2059 and 899 units respectively. DC cold resistance is elevated at 1.475 Ohms compared to 0.535 Ohms in the primary part. Certifications limited to CE, CSA, KC, and UL. Suitable for applications where higher resistance is acceptable.

SCHURTER FST 5x20 (0034.3113) and SMD-FST (0034.5613.11): Both provide 35A breaking capacity with lower melting I²t values (0.768). Certifications include CCC, cURus, and VDE. Inventory of 2229 and 1828 units respectively. Suitable for cost-sensitive applications with standard protection requirements.

OptiFuse TSD-400MA: Lowest melting I²t at 0.7968 with 35A breaking capacity and 4031 units in stock. Certification per IEC 60127. Suitable for applications requiring faster response characteristics within the slow-blow classification.

OptiFuse TSC-400MA: Elevated breaking capacity of 100A with melting I²t of 1.2604. Certification per cULus and UL 248. Suitable for high-fault-current environments requiring UL-specific approvals.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts directly in place of the 0618.400MXP?

A: Yes. All listed substitute parts match the critical electrical parameters: 400 mA current rating, 250 V AC voltage rating, slow-blow response time, and 5mm x 20mm package dimensions. They are mechanically and electrically interchangeable in standard circuit protection applications. Variations in breaking capacity, melting I²t, and certifications do not affect basic functional compatibility.

Q: What is the difference between the Littelfuse 218 and 219 series?

A: The primary difference is breaking capacity. Series 218 (0218.400HXP, 0218.400MXP) provides 35A breaking capacity, while Series 219XA (0219.400MXAP) provides 150A breaking capacity. Both share identical current rating, voltage rating, and response time. The 219XA is suitable for applications with higher fault currents.

Q: Why do some parts have different DC cold resistance values?

A: DC cold resistance variations (0.535 Ohms vs. 1.475 Ohms) reflect different internal construction and materials. These variations do not affect the fuse's primary function as a circuit protection device. Selection should be based on application requirements; higher resistance may be relevant in low-voltage, high-current sensing circuits.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 Compliant status and are REACH Unaffected, meeting current environmental and regulatory requirements.

Q: Which substitute offers the best inventory availability?

A: Littelfuse 0218.400HXP provides the highest inventory with 4283 units in stock, followed by 0218.400MXP with 3680 units. Both are functionally identical to the primary part with comprehensive international certifications.

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

A: Yes. All substitute parts meet the same electrical and mechanical specifications. However, for consistency and simplified maintenance, using a single substitute part number across an application is recommended.

Q: What certifications should I verify for my specific application?

A: Verify that the selected substitute part carries certifications required by your regional standards and application. Common certifications include CCC (China), CE (Europe), CSA (Canada), UL (North America), and VDE (Europe). The parameter comparison table lists all certifications for each part.

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