Littelfuse 0219.250MXABP Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0219.250MXABP is a 250 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 slow-blow response characteristics and is rated for 150A breaking capacity at rated voltage. The part is active in production with full compliance to international standards including UL, CE, CSA, VDE, CCC, and SEMKO certifications. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, response time characteristics, and approval agency compliance to ensure direct interchangeability in circuit protection applications.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution eligibility for the 0219.250MXABP is determined by the following criteria:

Primary Matching Parameters:

Current Rating: 250 mA (exact match required)
Voltage Rating: 250 V AC (exact match required)
Package Dimensions: 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:

Operating Temperature Range: -55°C to 125°C (must support or exceed)
RoHS Compliance: ROHS3 Compliant (required for environmental compliance)
Approval Agencies: Must include UL, CE, or CSA certification

Substitute parts are grouped into two categories based on breaking capacity and melting I²t characteristics:

Category A (High Breaking Capacity): Parts with 150A breaking capacity and 0.54 melting I²t (0219.250MXAP)

Category B (Standard Breaking Capacity): Parts with 35A breaking capacity and melting I²t values between 0.238 and 0.5405 (0218.250HXP, 0218.250MXP, 0218.250TXP, 0239.250HXP, 0239.250MXP, 0618.250MXP, 0034.3111, 0034.5611.11, TSC-250MA)

Category C (Alternative Melting Characteristics): Parts with 35A breaking capacity and lower melting I²t of 0.34 (0239.250HXP, 0239.250MXP)

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating	Voltage Rating (AC)	Package	Response Time	Breaking Capacity @ Rated Voltage	Melting I²t	DC Cold Resistance (Ohms)	Approval Agencies	Inventory Status
0219.250MXABP	Littelfuse Inc.	219XA	250 mA	250 V	5mm x 20mm	Slow Blow	150A	0.54	1.0495	CCC, CE, CSA, SEMKO, UL, VDE	940 Pcs
0219.250MXAP	Littelfuse Inc.	219XA	250 mA	250 V	5mm x 20mm	Slow Blow	150A	0.54	1.0495	CCC, CE, CSA, SEMKO, UL, VDE	6331 Pcs
0218.250HXP	Littelfuse Inc.	218	250 mA	250 V	5mm x 20mm	Slow Blow	35A	0.5405	1.0495	CCC, CE, CSA, K-MARK, SEMKO, UL, VDE	1775 Pcs
0218.250MXP	Littelfuse Inc.	218	250 mA	250 V	5mm x 20mm	Slow Blow	35A	0.5405	1.0495	CCC, CE, CSA, K-MARK, SEMKO, UL, VDE	2100 Pcs
0218.250TXP	Littelfuse Inc.	218	250 mA	250 V	5mm x 20mm	Slow Blow	35A	0.5405	1.0495	CCC, CE, CSA, KC, SEMKO, UL, VDE	1226 Pcs
0239.250HXP	Littelfuse Inc.	239	250 mA	250 V	5mm x 20mm	Slow Blow	35A	0.34	3.07	CE, CSA, KC, UL	951 Pcs
0239.250MXP	Littelfuse Inc.	239	250 mA	250 V	5mm x 20mm	Slow Blow	35A	0.34	3.07	CE, CSA, KC, UL	1968 Pcs
0618.250MXP	Littelfuse Inc.	618	250 mA	250 V	5mm x 20mm	Slow Blow	35A	0.5405	1.0495	CCC, CE, CSA, UR, VDE	1780 Pcs
0034.3111	SCHURTER Inc.	FST 5x20	250 mA	250 V	5mm x 20mm	Slow Blow	35A	0.238	Not Specified	CCC, cURus, VDE	2161 Pcs
0034.5611.11	SCHURTER Inc.	SMD-FST	250 mA	250 V	5mm x 20mm	Slow Blow	35A	0.238	Not Specified	cURus, VDE	1112 Pcs
TSC-250MA	OptiFuse	TSC	250 mA	250 V	5mm x 20mm	Slow Blow	100A	0.278	Not Specified	cULus, UL 248	3656 Pcs

Engineering Selection Recommendations

Direct Equivalent (Preferred): The 0219.250MXAP from Littelfuse Inc. (Series 219XA) is the direct equivalent to the 0219.250MXABP. Both parts share identical electrical ratings (250 mA, 250 V), mechanical dimensions (5mm x 20mm), response characteristics (slow blow), breaking capacity (150A), and melting I²t (0.54). Both maintain full compliance with CCC, CE, CSA, SEMKO, UL, and VDE certifications. This part is preferred for applications requiring the same breaking capacity specification.

Littelfuse Series 218 Alternatives (0218.250HXP, 0218.250MXP, 0218.250TXP): These parts maintain identical electrical ratings, dimensions, and response time but feature reduced breaking capacity (35A versus 150A) and slightly higher melting I²t (0.5405 versus 0.54). All three variants retain full compliance with CCC, CE, CSA, SEMKO, UL, and VDE certifications. Selection among these three is based on series preference and availability.

Littelfuse Series 239 Alternatives (0239.250HXP, 0239.250MXP): These parts match electrical ratings and dimensions but feature lower breaking capacity (35A) and significantly lower melting I²t (0.34). DC cold resistance is elevated at 3.07 Ohms compared to 1.0495 Ohms in the main part. Certification coverage is reduced to CE, CSA, KC, and UL. These parts are suitable for applications where lower melting I²t is acceptable and reduced certification scope is permissible.

Littelfuse Series 618 Alternative (0618.250MXP): This part provides identical electrical ratings and dimensions with 35A breaking capacity and 0.5405 melting I²t. Certifications include CCC, CE, CSA, UR, and VDE. This option is suitable when Series 618 is specified in design documentation.

SCHURTER Alternatives (0034.3111, 0034.5611.11): Both SCHURTER parts match electrical ratings and dimensions with 35A breaking capacity and 0.238 melting I²t. Certification coverage is limited to CCC/cURus and VDE. These parts are suitable for applications where SCHURTER brand specification is required or where lower melting I²t is acceptable.

OptiFuse Alternative (TSC-250MA): This part matches electrical ratings and dimensions with 100A breaking capacity and 0.278 melting I²t. Certifications include cULus and UL 248. This option is suitable for applications where OptiFuse brand specification is required or where intermediate breaking capacity is needed.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 0219.250MXABP with any of the listed alternatives?

A: Substitution depends on your application's breaking capacity requirement. The 0219.250MXAP is a direct equivalent with identical 150A breaking capacity. Series 218, 239, 618 alternatives, and SCHURTER/OptiFuse parts feature 35A or 100A breaking capacity and should only be used if your circuit design permits lower breaking capacity ratings.

Q: What is the significance of breaking capacity in fuse selection?

A: Breaking capacity specifies the maximum fault current the fuse can safely interrupt without rupturing the fuse holder or creating a hazard. The main part (0219.250MXABP) is rated for 150A breaking capacity. Lower-rated alternatives (35A or 100A) must only be used in circuits where maximum fault current does not exceed their respective ratings.

Q: How does melting I²t affect fuse performance?

A: Melting I²t is a thermal characteristic that determines the fuse's response to overcurrent. Lower melting I²t values result in faster thermal response. The main part has 0.54 melting I²t. Alternatives with lower values (0.238 to 0.34) will respond more quickly to overcurrent conditions. Selection should align with circuit protection requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all listed substitute parts are ROHS3 compliant, matching the environmental compliance status of the main part.

Q: What certification differences exist among the alternatives?

A: The main part (0219.250MXABP) includes CCC, CE, CSA, SEMKO, UL, and VDE certifications. Littelfuse Series 218 parts add K-MARK certification. Series 239 parts are limited to CE, CSA, KC, and UL. SCHURTER parts include CCC/cURus and VDE. OptiFuse includes cULus and UL 248. Verify that substitute part certifications meet your regional and application requirements.

Q: Can I use the 0239.250HXP or 0239.250MXP as direct replacements?

A: These parts are mechanically and electrically compatible but feature different DC cold resistance (3.07 Ohms versus 1.0495 Ohms) and lower melting I²t (0.34 versus 0.54). They are suitable only if your circuit design accommodates these thermal and resistance characteristics and if the reduced certification scope (no SEMKO or CCC) is acceptable.

Q: What is the difference between 0034.3111 and 0034.5611.11?

A: Both SCHURTER parts share identical electrical ratings, dimensions, breaking capacity, and melting I²t. The primary difference is series designation (FST 5x20 versus SMD-FST). Selection between these parts depends on design specification or availability preference.

Q: Is the TSC-250MA from OptiFuse a suitable alternative?

A: The TSC-250MA matches electrical ratings and dimensions with 100A breaking capacity and 0.278 melting I²t. It is suitable if OptiFuse brand specification is required or if your circuit design permits 100A breaking capacity. Certification is limited to cULus and UL 248, which may not meet all regional requirements.

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