Littelfuse 0219.400MXABP Equivalent & Substitute Parts

Part Overview

The Littelfuse 0219.400MXABP is a 400 mA, 250 V AC/DC slow blow glass cartridge fuse in 5mm x 20mm form factor. This fuse is designed for circuit protection in applications requiring moderate current interruption with delayed response characteristics. The part is active in production with 1071 units in stock. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, response time characteristics, and approval certifications to ensure direct functional replacement 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

Substitution eligibility is determined by the following critical parameters:

Current Rating: 400 mA (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Response Time: Slow Blow (exact match required)
Fuse Type: Cartridge, Glass (exact match required)

Parts meeting all five criteria are classified as parametric equivalents and are directly substitutable. Variations in breaking capacity, melting I²t, DC cold resistance, or approval certifications do not prevent substitution when the above parameters match exactly.

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage (AC)	Response Time	Package	Breaking Capacity @ Rated Voltage	Melting I²t	DC Cold Resistance	Operating Temperature	Inventory
0219.400MXABP	Littelfuse Inc.	400 mA	250 V	Slow Blow	5mm x 20mm	150 A	1.4	0.535 Ω	-55°C to 125°C	1071 Pcs
0213.400MXP	Littelfuse	400 mA	250 V	Slow Blow	5mm x 20mm	35 A	1.36	0.535 Ω	-55°C to 125°C	1252 Pcs
0218.400HXP	Littelfuse Inc.	400 mA	250 V	Slow Blow	5mm x 20mm	35 A	1.325	0.535 Ω	-55°C to 125°C	4283 Pcs
0218.400MXP	Littelfuse Inc.	400 mA	250 V	Slow Blow	5mm x 20mm	35 A	1.325	0.535 Ω	-55°C to 125°C	3680 Pcs
0219.400MXAP	Littelfuse Inc.	400 mA	250 V	Slow Blow	5mm x 20mm	150 A	1.4	0.535 Ω	-55°C to 125°C	1691 Pcs
0239.400HXP	Littelfuse Inc.	400 mA	250 V	Slow Blow	5mm x 20mm	35 A	1.49	1.475 Ω	-55°C to 125°C	899 Pcs
0239.400MXP	Littelfuse Inc.	400 mA	250 V	Slow Blow	5mm x 20mm	35 A	1.49	1.475 Ω	-55°C to 125°C	2059 Pcs
0034.2512	SCHURTER Inc.	400 mA	250 V	Medium Blow	5mm x 20mm	80 A	0.632	Not specified	-40°C to 85°C	1852 Pcs
0034.3113	SCHURTER Inc.	400 mA	250 V	Slow Blow	5mm x 20mm	35 A	0.768	Not specified	-55°C to 125°C	2229 Pcs
0034.5613.11	SCHURTER Inc.	400 mA	250 V	Slow Blow	5mm x 20mm	35 A	0.768	Not specified	-55°C to 125°C	1828 Pcs
TSC-400MA	OptiFuse	400 mA	250 V	Slow Blow	5mm x 20mm	100 A	1.2604	Not specified	-55°C to 125°C	2439 Pcs

Engineering Selection Recommendations

All listed parts meet the core substitution criteria of 400 mA current rating, 250 V AC voltage rating, slow blow response time, and 5mm x 20mm package dimensions. Selection among equivalents should be based on the following factors:

Littelfuse Series 219XA (0219.400MXABP, 0219.400MXAP): These parts feature 150 A breaking capacity and are approved by CCC, CE, CSA, SEMKO, UL, and VDE. Both are ROHS3 compliant with unlimited moisture sensitivity level (MSL 1). The 0219.400MXAP variant offers equivalent performance with higher inventory availability (1691 units).

Littelfuse Series 218 (0218.400HXP, 0218.400MXP): These parts provide 35 A breaking capacity with K-MARK approval in addition to CCC, CE, CSA, SEMKO, UL, and VDE certifications. The 0218.400HXP has the highest inventory level (4283 units) among Littelfuse options.

Littelfuse Series 213 (0213.400MXP): Offers 35 A breaking capacity with BSI, CCC, CE, CSA, SEMKO, UR, and VDE approvals. Inventory is 1252 units.

Littelfuse Series 239 (0239.400HXP, 0239.400MXP): These parts feature 35 A breaking capacity with CE, CSA, KC, and UL approvals. DC cold resistance is 1.475 Ω (higher than other Littelfuse options). MSL rating is 1 (Unlimited).

SCHURTER FSM 5x20 (0034.2512): This part has a medium blow response time rather than slow blow, making it unsuitable for direct substitution with the 0219.400MXABP. Operating temperature range is -40°C to 85°C, which is narrower than the main part.

SCHURTER FST 5x20 (0034.3113, 0034.5613.11): Both parts match the slow blow response time and operating temperature range. Approvals include CCC, cURus, and VDE. Melting I²t is 0.768, lower than the main part. These are suitable parametric equivalents with 2229 and 1828 units in stock respectively.

OptiFuse TSC-400MA: This part meets all substitution criteria with 100 A breaking capacity and cULus/UL 248 approvals. Operating temperature range matches (-55°C to 125°C). Inventory is 2439 units.

Frequently Asked Questions (FAQ)

Q: Can 0034.2512 be used as a direct substitute for 0219.400MXABP?

A: No. The 0034.2512 has a medium blow response time, while the 0219.400MXABP requires slow blow. Response time is a critical substitution parameter and must match exactly. Additionally, the operating temperature range of 0034.2512 (-40°C to 85°C) is narrower than the main part (-55°C to 125°C).

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

A: Both series have identical electrical ratings (400 mA, 250 V AC, slow blow, 5mm x 20mm). The primary difference is breaking capacity: 219XA series has 150 A breaking capacity, while 218 series has 35 A. Both are ROHS3 compliant and operate across -55°C to 125°C. Selection depends on application requirements for breaking capacity.

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

A: Yes, when all five critical parameters match: current rating (400 mA), voltage rating (250 V AC), response time (slow blow), package (5mm x 20mm), and fuse type (cartridge, glass). Variations in breaking capacity, melting I²t, or approval certifications do not affect functional compatibility in the circuit protection role.

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

A: DC cold resistance is a measured characteristic that varies slightly between manufacturers and series designs. The 0239 series (1.475 Ω) has higher DC cold resistance than other options (0.535 Ω). This parameter does not affect substitutability when all primary electrical ratings match.

Q: Which substitute part has the highest inventory availability?

A: The Littelfuse 0218.400HXP has the highest inventory with 4283 units in stock. This part is a parametric equivalent with identical electrical specifications to the main part.

Q: Can I use a fuse with higher breaking capacity than the original?

A: Yes. A fuse with higher breaking capacity (such as 0219.400MXAP with 150 A versus 0218.400HXP with 35 A) provides equal or greater protection capability. Breaking capacity indicates the maximum fault current the fuse can safely interrupt. Higher breaking capacity does not compromise circuit protection when all other parameters match.

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