5VT 1-R Equivalent & Substitute Parts

Part Overview

The 5VT 1-R is a 1 A, 250 V AC/DC slow-blow glass cartridge fuse manufactured by Bel Fuse Inc. in a 5mm x 20mm package format. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations. Substitute fuses must maintain identical electrical ratings, mechanical dimensions, and holder compatibility to ensure proper circuit protection without modification to existing fuse holders or circuit designs.

Key Parameters

Parameter	Value
Current Rating	1 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	5mm x 20mm
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	35 A
Operating Temperature Range	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute fuses for the 5VT 1-R are classified based on strict electrical and mechanical compatibility. All substitute parts must meet the following mandatory criteria:

Current Rating: 1 A (exact match)
Voltage Rating: 250 V AC (exact match)
Package Dimensions: 5mm x 20mm (exact match)
Fuse Type: Cartridge, Glass (exact match)
Response Time: Slow Blow (exact match)
Mounting Type: Requires Holder (exact match)

Substitute parts are grouped into two categories:

Direct Substitutes: Parts with identical electrical characteristics and breaking capacity specifications (35 A @ rated voltage). These parts are interchangeable without any circuit performance variation.

Compatible Substitutes: Parts meeting all mandatory electrical and mechanical criteria but with different breaking capacity ratings (100 A or 150 A @ rated voltage) or melting I²t values. These parts provide equivalent circuit protection for the specified 1 A load but may exhibit different performance under fault conditions exceeding the original design specification.

Parameter Comparison

Part Number	Manufacturer	Current Rating (A)	Voltage Rating (V AC)	Response Time	Package	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ω)	Product Status
5VT 1-R	Bel Fuse Inc.	1	250	Slow Blow	5mm x 20mm	35	28	0.11	Obsolete
0213001.MXP	Littelfuse Inc.	1	250	Slow Blow	5mm x 20mm	35	19.2	0.1165	Active
0218001.MXP	Littelfuse Inc.	1	250	Slow Blow	5mm x 20mm	35	6.73	0.0613	Active
0218001.TXP	Littelfuse Inc.	1	250	Slow Blow	5mm x 20mm	35	6.73	0.0613	Active
0219001.MXAP	Littelfuse Inc.	1	250	Slow Blow	5mm x 20mm	150	19.2	0.1165	Active
0239001.HXP	Littelfuse Inc.	1	250	Slow Blow	5mm x 20mm	35	11.295	0.2965	Active
BK1/GMD-1-R	Eaton - Electronics Division	1	250	Slow Blow	5mm x 20mm	100	12	0.3065	Active

Engineering Selection Recommendations

Primary Recommendation: 0213001.MXP (Littelfuse Inc., Series 213)

This part is the preferred direct substitute. It maintains identical electrical ratings, breaking capacity (35 A), and mechanical dimensions. Product status is active with high inventory availability (10,400 pcs). Compliance certifications include BSI, CCC, CE, CSA, PSE, SEMKO, UR, and VDE, providing broad regulatory acceptance across global markets.

Secondary Recommendation: 0218001.MXP or 0218001.TXP (Littelfuse Inc., Series 218)

Both parts meet all mandatory electrical and mechanical criteria with identical breaking capacity (35 A). The 0218001.MXP variant carries certifications for CCC, CE, CSA, K-MARK, PSE, SEMKO, UL, and VDE. The 0218001.TXP variant includes KC certification in addition to the standard set. Inventory availability is high (17,900 pcs for MXP; 772 pcs for TXP). These parts are suitable for applications requiring UL certification.

Alternative Recommendation: 0239001.HXP (Littelfuse Inc., Series 239)

This part meets all mandatory criteria with identical breaking capacity (35 A). Certifications include CE, CSA, KC, PSE, and UL. This option is suitable for applications requiring Korean market compliance (KC certification). Inventory availability is moderate (835 pcs).

Compatible Alternative: 0219001.MXAP (Littelfuse Inc., Series 219XA)

This part meets all mandatory electrical and mechanical criteria but features an elevated breaking capacity of 150 A. Use this part only when the circuit design specifically requires higher fault current withstand capability. Certifications include CCC, CE, CSA, PSE, SEMKO, UL, and VDE. Inventory availability is adequate (2,488 pcs).

Compatible Alternative: BK1/GMD-1-R (Eaton - Electronics Division, Series GMD)

This part meets all mandatory electrical and mechanical criteria but features an elevated breaking capacity of 100 A. Use this part only when the circuit design specifically requires higher fault current withstand capability. Certifications include CSA, PSE/JET, and UL. Inventory availability is moderate (1,106 pcs).

Frequently Asked Questions (FAQ)

Q: Can I use a substitute fuse with a different breaking capacity rating?

A: Yes, provided the substitute maintains the same 1 A current rating, 250 V voltage rating, 5mm x 20mm package dimensions, and slow-blow response time. Fuses with higher breaking capacity ratings (100 A or 150 A) are mechanically and electrically compatible with the original 5VT 1-R holder. However, they will exhibit different performance under fault conditions exceeding the original design specification. Select higher breaking capacity ratings only if your circuit design requires enhanced fault current withstand capability.

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

A: Melting I²t is a thermal characteristic that determines the fuse's response to overcurrent conditions. The 5VT 1-R has a melting I²t of 28. Substitute parts exhibit varying melting I²t values (ranging from 6.73 to 19.2 for direct substitutes). Lower melting I²t values indicate faster thermal response to overcurrent. Select substitutes based on your circuit's specific overcurrent protection requirements. For applications requiring identical thermal response characteristics, choose substitutes with melting I²t values closest to the original specification.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant, matching the environmental compliance status of the original 5VT 1-R.

Q: Which substitute part has the broadest regulatory certification coverage?

A: The 0213001.MXP (Littelfuse Inc., Series 213) carries the most comprehensive certification set, including BSI, CCC, CE, CSA, PSE, SEMKO, UR, and VDE. This part is suitable for applications requiring compliance across North American, European, and Asian markets.

Q: Can I use these substitute fuses in any 5mm x 20mm fuse holder?

A: Yes. All substitute parts maintain the identical 5mm x 20mm package dimensions and require a holder for installation, matching the mounting requirements of the original 5VT 1-R. No holder modifications are necessary.

Q: What is the difference between the 0218001.MXP and 0218001.TXP variants?

A: Both parts are electrically and mechanically identical (1 A, 250 V, 5mm x 20mm, 35 A breaking capacity). The primary difference is regulatory certification: 0218001.MXP includes K-MARK certification, while 0218001.TXP includes KC certification. Select based on your target market's regulatory requirements.

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