Littelfuse 0239.500MXP Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0239.500MXP is a 500 mA, 250 V AC/DC glass cartridge fuse with slow-blow response characteristics, designed for 5mm x 20mm holder applications. This fuse is active in production and widely used in industrial and consumer electronics for circuit protection. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, and approval certifications to ensure direct interchangeability in circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	500 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	5mm x 20mm
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 criteria:

Primary Matching Parameters:

Current Rating: 500 mA (exact match required)
Voltage Rating: 250 V AC (exact match required)
Package / Case: 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 (minimum requirement)
RoHS Compliance: ROHS3 Compliant (preferred)
Approval Certifications: CE, CSA, UL, or equivalent recognized agencies

All substitute parts listed meet the primary matching parameters. Variations in breaking capacity, melting I²t, and DC cold resistance do not affect functional interchangeability within the specified electrical and mechanical constraints.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating	Voltage Rating (AC)	Response Time	Package	Breaking Capacity @ Rated Voltage	Melting I²t	DC Cold Resistance (Ohms)	Approval Agencies	Inventory (Pcs)
0239.500MXP	Littelfuse Inc.	239	500 mA	250 V	Slow Blow	5mm x 20mm	35A	1.985	0.909	CE, CSA, KC, UL	2300
0214.600MXP	Littelfuse Inc.	213	500 mA	250 V	Slow Blow	5mm x 20mm	35A	2.905	0.37	BSI, CCC, CE, CSA, SEMKO, UR, VDE	2100
0218.500HXP	Littelfuse Inc.	218	500 mA	250 V	Slow Blow	5mm x 20mm	35A	2.825	0.37	CCC, CE, CSA, K-MARK, SEMKO, UL, VDE	4644
0218.500MXP	Littelfuse Inc.	218	500 mA	250 V	Slow Blow	5mm x 20mm	35A	2.825	0.37	CCC, CE, CSA, K-MARK, SEMKO, UL, VDE	15465
0218.500TXP	Littelfuse Inc.	218	500 mA	250 V	Slow Blow	5mm x 20mm	35A	2.825	0.37	CCC, CE, CSA, KC, SEMKO, UL, VDE	880
0219.500MXAP	Littelfuse Inc.	219XA	500 mA	250 V	Slow Blow	5mm x 20mm	150A	3	0.37	CCC, CE, CSA, SEMKO, UL, VDE	1056
0239.500HXP	Littelfuse Inc.	239	500 mA	250 V	Slow Blow	5mm x 20mm	35A	1.985	0.909	CE, CSA, KC, UL	1485
0618.500MXP	Littelfuse Inc.	618	500 mA	250 V	Slow Blow	5mm x 20mm	35A	2.825	0.37	CCC, CE, CSA, UR, VDE	16300
5TT 500-R	Bel Fuse Inc.	5TT	500 mA	250 V	Slow Blow	5mm x 20mm	100A	2.5	0.865	CE, CSA, cULus	902
GDC-500MA	Eaton - Electronics Division	GDC	500 mA	250 V	Slow Blow	5mm x 20mm	35A	0.827	0.183	cURus, IMQ	1149
0034.3114	SCHURTER Inc.	FST 5x20	500 mA	250 V	Slow Blow	5mm x 20mm	35A	3	Not Specified	CCC, cURus, VDE	12470

Engineering Selection Recommendations

Littelfuse Series 218 (0218.500MXP, 0218.500HXP, 0218.500TXP): These parts are direct parametric equivalents with the broadest approval certification coverage (CCC, CE, CSA, K-MARK, SEMKO, UL, VDE). The 0218.500MXP variant offers the highest inventory availability (15,465 pcs) and is suitable for applications requiring maximum supply chain flexibility.

Littelfuse Series 239 (0239.500HXP): This part shares identical electrical and thermal characteristics with the main part 0239.500MXP, differing only in response time classification designation. Both are certified by CE, CSA, KC, and UL.

Littelfuse Series 618 (0618.500MXP): Parametric equivalent with high inventory (16,300 pcs). Certifications include CCC, CE, CSA, UR, and VDE. Suitable for applications where UR certification is required.

Littelfuse Series 213 (0214.600MXP): Offers extended certification coverage (BSI, CCC, CE, CSA, SEMKO, UR, VDE) with moderate inventory availability (2,100 pcs).

Littelfuse Series 219XA (0219.500MXAP): Parametric equivalent with enhanced breaking capacity (150A vs. 35A). Suitable for applications requiring higher fault current withstand capability.

Bel Fuse 5TT 500-R: Cross-manufacturer equivalent from Bel Fuse Inc. with CE, CSA, and cULus certifications. Breaking capacity of 100A provides intermediate fault current protection.

Eaton GDC-500MA: Cross-manufacturer equivalent from Eaton Electronics Division. Certifications include cURus and IMQ. Lowest DC cold resistance (0.183 Ohms) among all listed substitutes.

SCHURTER 0034.3114: Cross-manufacturer equivalent from SCHURTER Inc. with CCC, cURus, and VDE certifications. Highest inventory availability (12,470 pcs) among non-Littelfuse options.

Frequently Asked Questions (FAQ)

Q: Can I substitute 0218.500MXP for 0239.500MXP in my application?

A: Yes. Both parts meet all primary matching parameters: 500 mA current rating, 250 V AC voltage rating, 5mm x 20mm package, slow-blow response, and cartridge glass fuse type. The 0218.500MXP has broader certification coverage (includes K-MARK and SEMKO) and higher inventory availability.

Q: What is the difference between the Littelfuse 239 and 218 series?

A: Both series meet identical electrical and mechanical specifications for this 500 mA, 250 V application. The primary differences are in approval certifications and DC cold resistance. Series 218 includes K-MARK and SEMKO certifications, while Series 239 includes KC certification. Series 218 has lower DC cold resistance (0.37 Ohms vs. 0.909 Ohms).

Q: Is the 0219.500MXAP a direct substitute?

A: Yes, the 0219.500MXAP is a parametric equivalent meeting all primary matching criteria. It differs in breaking capacity (150A vs. 35A), making it suitable for applications requiring higher fault current protection without changing the fuse's response to normal operating currents.

Q: Can I use a cross-manufacturer part like Bel Fuse 5TT 500-R?

A: Yes. The 5TT 500-R meets all primary matching parameters and holds CE, CSA, and cULus certifications. Verify that your application's certification requirements accept cULus in place of UL or KC if those were originally specified.

Q: What does "slow blow" mean in the context of these fuses?

A: Slow-blow fuses tolerate temporary current surges without opening, responding only to sustained overcurrent conditions. All listed substitutes share this characteristic, ensuring consistent circuit protection behavior.

Q: Are all listed parts RoHS3 compliant?

A: Most listed parts are ROHS3 compliant. The Eaton GDC-500MA and SCHURTER 0034.3114 do not specify RoHS status in the provided data. Verify RoHS compliance requirements with your application specifications before selection.

Q: What is the significance of the 5mm x 20mm package dimension?

A: The 5mm x 20mm dimension specifies the physical size of the cartridge fuse and ensures mechanical compatibility with standard 5x20mm fuse holders. All listed substitutes share this dimension and are physically interchangeable in holders designed for this size.

Q: Which substitute offers the best inventory availability?

A: The Littelfuse 0618.500MXP offers the highest inventory (16,300 pcs), followed by the 0218.500MXP (15,465 pcs) and SCHURTER 0034.3114 (12,470 pcs). Inventory levels support supply chain continuity for high-volume applications.

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