Littelfuse 0618.630MXP Glass Cartridge Fuse 630mA 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 0618.630MXP is an active-status glass cartridge fuse rated for 630 mA at 250 V AC/DC with slow-blow response characteristics. This fuse requires a holder for installation and is housed in a 5mm x 20mm form factor. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, response time classification, and approval agency certifications. Alternative part numbers are necessary to address inventory availability, regional compliance requirements, and specific approval agency certifications required for different applications.

Key Parameters

Parameter	Value
Current Rating	630 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 ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following mandatory parameters:

Current Rating: 630 mA (exact match required)
Voltage Rating: 250 V AC (exact match required)
Response Time: Slow Blow (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Mounting Type: Requires Holder (exact match required)
Operating Temperature Range: -55°C ~ 125°C (exact match required)
RoHS Status: ROHS3 Compliant (exact match required)

All substitute parts listed meet these criteria. Variations in Breaking Capacity, Melting I²t, DC Cold Resistance, and approval agency certifications do not disqualify substitution but may affect suitability for specific regional or application-specific requirements.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (mA)	Voltage Rating (V AC)	Response Time	Package / Case	Breaking Capacity @ Rated Voltage (A)	Melting I²t	DC Cold Resistance (Ohms)	Approval Agencies	Inventory (Pcs)
0618.630MXP	Littelfuse Inc.	630	250	Slow Blow	5mm x 20mm	35	4.675	0.275	CCC, CE, CSA, UR, VDE	1863
0213.630MXP	Littelfuse Inc.	630	250	Slow Blow	5mm x 20mm	35	4.8	0.275	BSI, CCC, CE, CSA, SEMKO, UR, VDE	2415
0218.630HXP	Littelfuse Inc.	630	250	Slow Blow	5mm x 20mm	35	4.675	0.275	CCC, CE, CSA, K-MARK, SEMKO, UL, VDE	1742
0218.630MXP	Littelfuse	630	250	Slow Blow	5mm x 20mm	35	4.675	0.275	CCC, CE, CSA, K-MARK, SEMKO, UL, VDE	2443
0218.630TXP	Littelfuse Inc.	630	250	Slow Blow	5mm x 20mm	35	4.675	0.275	CCC, CE, CSA, KC, SEMKO, UL, VDE	792
0219.630MXAP	Littelfuse Inc.	630	250	Slow Blow	5mm x 20mm	150	4.82	0.275	CCC, CE, CSA, SEMKO, UL, VDE	1079
0034.3115	SCHURTER Inc.	630	250	Slow Blow	5mm x 20mm	35	4.35	—	CCC, cURus, VDE	10758
TSC-630MA	OptiFuse	630	250	Slow Blow	5mm x 20mm	100	0.566	—	cULus, UL 248	781
TSD-630MA	OptiFuse	630	250	Slow Blow	5mm x 20mm	35	1.583	—	IEC 60127	2577

Engineering Selection Recommendations

All listed substitute parts maintain active product status and meet ROHS3 compliance requirements. Selection among equivalent parts should be based on the following criteria:

Littelfuse series 213, 218, and 219XA parts (0213.630MXP, 0218.630HXP, 0218.630MXP, 0218.630TXP, 0219.630MXAP) are direct parametric equivalents with identical electrical characteristics and are recommended for applications requiring Littelfuse brand continuity or specific approval agency certifications including UL, K-MARK, or SEMKO.

The SCHURTER 0034.3115 (FST 5x20 series) provides equivalent electrical performance with CCC, cURus, and VDE certifications, suitable for applications prioritizing broad regional compliance.

OptiFuse TSC-630MA and TSD-630MA parts meet electrical and mechanical specifications but feature different Melting I²t values and approval agency certifications. TSC-630MA carries cULus and UL 248 certifications; TSD-630MA carries IEC 60127 certification. These parts are suitable for applications with specific regional or standards-based requirements.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 0618.630MXP with any of the listed parts?

A: Yes. All listed parts meet the mandatory substitution criteria: 630 mA current rating, 250 V AC voltage rating, slow-blow response time, 5mm x 20mm package, glass cartridge type, and -55°C to 125°C operating temperature range. Selection should account for approval agency certifications required by your application or region.

Q: What is the difference between the Littelfuse series parts?

A: Littelfuse series 213, 218, and 219XA parts share identical electrical ratings and mechanical dimensions. Differences exist in approval agency certifications and Melting I²t values. Series 218 parts include K-MARK and UL certifications; series 219XA features a higher Breaking Capacity of 150 A versus 35 A for other Littelfuse parts.

Q: Why do OptiFuse parts have different Melting I²t values?

A: Melting I²t is a thermal characteristic that reflects the fuse element's response to overcurrent conditions. Variations in this parameter do not disqualify substitution but may affect performance in applications with specific thermal requirements. Verify compatibility with your circuit design.

Q: Are there inventory considerations for substitution?

A: Yes. The SCHURTER 0034.3115 has the highest inventory (10,758 pcs), followed by Littelfuse 0218.630MXP (2,443 pcs) and OptiFuse TSD-630MA (2,577 pcs). Lower inventory parts include Littelfuse 0218.630TXP (792 pcs) and OptiFuse TSC-630MA (781 pcs).

Q: Which substitute part has the broadest approval agency coverage?

A: Littelfuse 0218.630MXP and 0218.630HXP include CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE certifications, providing the widest regional compliance coverage among Littelfuse options.

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