Littelfuse 0239001.TXP Glass Cartridge Fuse 1A 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 0239001.TXP is a 1 A, 250 V AC/DC glass cartridge fuse in 5mm x 20mm form factor with slow-blow response characteristics. This component is classified as Active product status and requires a fuse holder for installation. Glass cartridge fuses of this specification are widely used in industrial equipment, consumer electronics, and power distribution circuits where overcurrent protection is required. Substitute parts become necessary when the primary part number is unavailable, when inventory constraints exist, or when design flexibility allows for alternative qualified components meeting identical electrical and mechanical parameters.

Key Parameters

Parameter	Value
Current Rating	1 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm
Response Time	Slow Blow
Mounting Type	Requires Holder
Operating Temperature Range	-55°C to 125°C
RoHS Status	ROHS3 Compliant
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution eligibility for the 0239001.TXP is determined by strict equivalence across the following critical parameters: current rating (1 A), voltage rating (250 V AC), fuse type (cartridge glass), package dimensions (5mm x 20mm), response time (slow blow), and mounting requirement (requires holder). All substitute parts listed maintain these core electrical and mechanical specifications, ensuring direct functional interchangeability within the same circuit protection application.

The substitute parts are grouped into two categories based on manufacturer:

Littelfuse Series Substitutes: Parts from Littelfuse Inc. series 213, 218, and 219XA maintain identical electrical ratings and package specifications. Variations exist in melting I²t values and DC cold resistance, which reflect different thermal response profiles within the slow-blow classification but do not affect primary substitution eligibility.

Cross-Manufacturer Substitutes: SCHURTER Inc. parts (0034.3117, 0034.3117.G, 0034.5617.11) provide equivalent electrical and mechanical specifications from an alternative qualified manufacturer, expanding sourcing options while maintaining circuit protection performance.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating (A)	Voltage Rating (V AC)	Package	Response Time	Breaking Capacity @ Rated Voltage (A)	Melting I²t	DC Cold Resistance (Ohms)	Approval Agencies	Inventory (Pcs)
0239001.TXP	Littelfuse Inc.	239	1	250	5x20mm	Slow Blow	35	11.295	0.2965	CE, CSA, KC, PSE, UL	669
0213001.MXP	Littelfuse Inc.	213	1	250	5x20mm	Slow Blow	35	19.2	0.1165	BSI, CCC, CE, CSA, PSE, SEMKO, UR, VDE	10400
0213001.TXP	Littelfuse Inc.	213	1	250	5x20mm	Slow Blow	35	19.2	0.1165	BSI, CCC, CE, CSA, PSE, SEMKO, UR, VDE	783
0218001.HXP	Littelfuse Inc.	218	1	250	5x20mm	Slow Blow	35	6.73	0.0613	CCC, CE, CSA, K-MARK, PSE, SEMKO, UL, VDE	6258
0218001.MXP	Littelfuse Inc.	218	1	250	5x20mm	Slow Blow	35	6.73	0.0613	CCC, CE, CSA, K-MARK, PSE, SEMKO, UL, VDE	17900
0218001.TXP	Littelfuse Inc.	218	1	250	5x20mm	Slow Blow	35	6.73	0.0613	CCC, CE, CSA, KC, PSE, SEMKO, UL, VDE	772
0219001.MXABP	Littelfuse Inc.	219XA	1	250	5x20mm	Slow Blow	150	19.2	0.1165	CCC, CE, CSA, PSE, SEMKO, UL, VDE	1426
0219001.MXAP	Littelfuse Inc.	219XA	1	250	5x20mm	Slow Blow	150	19.2	0.1165	CCC, CE, CSA, PSE, SEMKO, UL, VDE	2488
0034.3117	SCHURTER Inc.	FST 5x20	1	250	5x20mm	Slow Blow	35	3.3	Not Specified	CCC, cURus, PSE/JET, VDE	7410
0034.3117.G	SCHURTER Inc.	FST 5x20	1	250	5x20mm	Slow Blow	35	3.3	Not Specified	CCC, cURus, PSE/JET, VDE	3721
0034.5617.11	SCHURTER Inc.	SMD-FST	1	250	5x20mm	Slow Blow	35	3.3	Not Specified	cURus, VDE	1805

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and are ROHS3 compliant with REACH Unaffected classification, meeting current environmental and regulatory requirements.

Littelfuse Series 213 (0213001.MXP, 0213001.TXP): These parts provide the highest inventory availability (10400 and 783 units respectively) and expanded approval agency coverage including BSI, SEMKO, and UR certifications. The melting I²t value of 19.2 represents a slower thermal response within the slow-blow classification compared to the primary part.

Littelfuse Series 218 (0218001.HXP, 0218001.MXP, 0218001.TXP): These parts offer the fastest thermal response (melting I²t of 6.73) and the lowest DC cold resistance (0.0613 Ohms). Series 218 parts provide substantial inventory depth, particularly 0218001.MXP with 17900 units available. All three variants carry comprehensive approval agency certifications including UL and VDE.

Littelfuse Series 219XA (0219001.MXABP, 0219001.MXAP): These parts feature an elevated breaking capacity of 150A compared to 35A in other substitutes, with melting I²t of 19.2. Both variants maintain full approval agency coverage and represent suitable alternatives where higher fault current withstand capability is required.

SCHURTER FST Series (0034.3117, 0034.3117.G, 0034.5617.11): These cross-manufacturer alternatives provide equivalent electrical and mechanical specifications with the lowest melting I²t value (3.3), representing the fastest thermal response among all listed substitutes. SCHURTER parts expand sourcing flexibility and are suitable for applications where multi-source qualification is required. The 0034.3117 variant offers the highest SCHURTER inventory (7410 units).

Frequently Asked Questions (FAQ)

Q: Can any of these substitute parts be used interchangeably with the 0239001.TXP in the same circuit?

A: Yes. All listed substitute parts maintain identical current rating (1 A), voltage rating (250 V AC), fuse type (cartridge glass), package dimensions (5mm x 20mm), response time classification (slow blow), and mounting requirement (requires holder). Direct substitution is electrically and mechanically valid.

Q: What is the significance of the different melting I²t values across substitute parts?

A: Melting I²t represents the thermal energy required to melt the fuse element and is a characteristic of the slow-blow response classification. Variations in melting I²t (ranging from 3.3 to 19.2 across substitutes) reflect different thermal response profiles within the slow-blow category. The primary part (0239001.TXP) has a melting I²t of 11.295, placing it in the mid-range of the substitute options. Selection should be based on circuit-specific thermal requirements.

Q: Are there approval agency differences that affect substitution eligibility?

A: All substitute parts carry relevant safety certifications (CE, CSA, PSE, UL, VDE). The primary part 0239001.TXP is certified by CE, CSA, KC, PSE, and UL. Littelfuse Series 213 parts include additional certifications (BSI, SEMKO, UR). SCHURTER parts carry cURus and VDE certifications. Substitution is valid within the same regulatory jurisdiction; verify that the substitute part's certification portfolio meets your specific application requirements.

Q: What is the difference between Littelfuse and SCHURTER substitute options?

A: Both manufacturers provide equivalent electrical and mechanical specifications. Littelfuse substitutes offer greater inventory availability and expanded certification coverage. SCHURTER substitutes provide cross-manufacturer sourcing flexibility and represent the fastest thermal response (melting I²t of 3.3). Selection depends on supply chain strategy and application-specific thermal requirements.

Q: Does the DC cold resistance variation affect circuit performance?

A: DC cold resistance values range from 0.0613 Ohms (Series 218) to 0.2965 Ohms (primary part 0239001.TXP). These variations are within the normal range for slow-blow glass cartridge fuses and do not affect primary circuit protection function. Cold resistance becomes relevant only in applications with extremely low-voltage, high-current circuits where resistive heating is a design consideration.

Q: Can I substitute a part with higher breaking capacity (Series 219XA at 150A vs. 35A)?

A: Yes. The breaking capacity specification defines the maximum fault current the fuse can safely interrupt. A higher breaking capacity (150A) provides additional safety margin in applications with higher available fault currents. Substitution with higher breaking capacity is valid and does not compromise circuit protection.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH Unaffected, meeting current environmental and regulatory requirements for electronic component manufacturing and use.

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