Littelfuse 0218.400H Equivalent & Substitute Parts

Part Overview

The Littelfuse 0218.400H is a 400 mA, 250 V AC/DC glass cartridge fuse with a 5mm x 20mm form factor and slow-blow response time. This part is classified as obsolete. Identifying equivalent and substitute parts is necessary to ensure continued circuit protection capability in applications where the original part is no longer available. Substitute parts must maintain identical electrical ratings, mechanical dimensions, and response characteristics to ensure proper circuit protection without modification to existing fuse holders or circuit designs.

Key Parameters

Parameter	Value
Current Rating	400 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm
Response Time	Slow Blow
Breaking Capacity @ Rated Voltage	35 A
Operating Temperature Range	-55°C to 125°C
DC Cold Resistance	0.535 Ohms
Mounting Type	Requires Holder

Substitute Part Grouping Explanation

Substitute parts for the 0218.400H are grouped based on strict electrical and mechanical equivalence. All substitute parts must meet the following criteria:

Current Rating: 400 mA (exact match)
Voltage Rating: 250 V AC (exact match)
Fuse Type: Cartridge, Glass (exact match)
Package Dimensions: 5mm x 20mm (exact match)
Response Time: Slow Blow (exact match)
Operating Temperature: -55°C to 125°C (exact match)
DC Cold Resistance: 0.535 Ohms (exact match)
Mounting Type: Requires Holder (exact match)

Substitute parts are differentiated by series designation (213, 218, 219XA), product status (Active vs. Obsolete), RoHS compliance status, and regulatory certifications. Parts within the same series or across series that maintain identical electrical and mechanical parameters are considered parametric equivalents and direct substitutes.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating	Voltage Rating (AC)	Package	Response Time	Breaking Capacity	Melting I²t	Product Status	RoHS Status
0218.400H	Littelfuse Inc.	218	400 mA	250 V	5mm x 20mm	Slow Blow	35 A	1.35	Obsolete	Non-compliant
0213.400MXBP	Littelfuse	213	400 mA	250 V	5mm x 20mm	Slow Blow	35 A	1.36	Active	ROHS3 Compliant
0213.400MXP	Littelfuse	213	400 mA	250 V	5mm x 20mm	Slow Blow	35 A	1.36	Active	ROHS3 Compliant
0213.400TXP	Littelfuse Inc.	213	400 mA	250 V	5mm x 20mm	Slow Blow	35 A	1.36	Active	ROHS3 Compliant
0218.400HXP	Littelfuse Inc.	218	400 mA	250 V	5mm x 20mm	Slow Blow	35 A	1.325	Active	ROHS3 Compliant
0218.400MXBP	Littelfuse Inc.	218	400 mA	250 V	5mm x 20mm	Slow Blow	35 A	1.325	Active	ROHS3 Compliant
0218.400MXP	Littelfuse Inc.	218	400 mA	250 V	5mm x 20mm	Slow Blow	35 A	1.325	Active	ROHS3 Compliant
0218.400TXP	Littelfuse Inc.	218	400 mA	250 V	5mm x 20mm	Slow Blow	35 A	1.325	Active	ROHS3 Compliant
0218.400VXP	Littelfuse Inc.	218	400 mA	250 V	5mm x 20mm	Slow Blow	35 A	1.325	Active	ROHS3 Compliant
0219.400MXABP	Littelfuse Inc.	219XA	400 mA	250 V	5mm x 20mm	Slow Blow	150 A	1.4	Active	ROHS3 Compliant
0219.400MXAP	Littelfuse Inc.	219XA	400 mA	250 V	5mm x 20mm	Slow Blow	150 A	1.4	Active	ROHS3 Compliant

Engineering Selection Recommendations

For direct replacement of the obsolete 0218.400H, select from active-status parts within the same 218 series: 0218.400HXP, 0218.400MXBP, 0218.400MXP, 0218.400TXP, or 0218.400VXP. These parts maintain identical electrical and mechanical specifications while offering ROHS3 compliance and active product status.

Parts from the 213 series (0213.400MXBP, 0213.400MXP, 0213.400TXP) are parametric equivalents with marginally higher melting I²t values (1.36 vs. 1.35) and provide alternative sourcing options with active status and ROHS3 compliance.

Parts from the 219XA series (0219.400MXABP, 0219.400MXAP) maintain identical electrical ratings but feature higher breaking capacity (150 A vs. 35 A). These are suitable for applications requiring enhanced fault current handling while maintaining the same fuse response and current rating.

All substitute parts are manufactured by Littelfuse Inc. and are available in bulk packaging. Selection should prioritize parts with the highest inventory availability and certifications matching the original application requirements.

Frequently Asked Questions (FAQ)

Q: Can I use a 213 series fuse as a direct replacement for the 0218.400H?

A: Yes. The 213 series parts (0213.400MXBP, 0213.400MXP, 0213.400TXP) are parametric equivalents with identical current rating, voltage rating, package dimensions, and response time. The melting I²t difference (1.36 vs. 1.35) is negligible for circuit protection purposes. All 213 series substitutes are ROHS3 compliant and active products.

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

A: Both series maintain identical electrical ratings (400 mA, 250 V AC, slow-blow response). The primary difference is breaking capacity: 218 series parts have 35 A breaking capacity, while 219XA series parts have 150 A breaking capacity. The 219XA series is suitable for applications with higher fault current requirements.

Q: Are all substitute parts compatible with existing fuse holders designed for the 0218.400H?

A: Yes. All substitute parts share the identical 5mm x 20mm cartridge form factor and require a holder for mounting. They are mechanically and electrically compatible with any fuse holder rated for 5mm x 20mm glass cartridge fuses.

Q: What does RoHS3 compliance mean for fuse selection?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting the use of specific hazardous materials. The original 0218.400H is RoHS non-compliant. All active substitute parts listed are ROHS3 compliant, making them suitable for applications with RoHS compliance requirements.

Q: Can I substitute a 0219.400MXABP for the 0218.400H in my circuit?

A: Yes, from an electrical and mechanical standpoint. The 0219.400MXABP maintains identical current rating, voltage rating, package dimensions, and response time. The higher breaking capacity (150 A vs. 35 A) provides enhanced fault current handling without affecting normal circuit operation. Verify that your application does not have specific breaking capacity requirements that would exclude this option.

Q: What is the significance of melting I²t in fuse selection?

A: Melting I²t defines the thermal energy required to melt the fuse element. Substitute parts with melting I²t values between 1.325 and 1.4 are functionally equivalent for the 0218.400H application. Slight variations within this range do not affect circuit protection performance.

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