Equivalent & Substitute Parts for 5TT 100-R Glass Cartridge Fuse

Part Overview

The Bel Fuse Inc. 5TT 100-R is a 100 mA, 250 V AC/DC glass cartridge fuse in 5mm x 20mm form factor with slow-blow response characteristics. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts that maintain electrical and mechanical compatibility for continued system operation and procurement.

Key Parameters

Parameter	Value
Current Rating	100 mA
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 ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following parameters:

Current Rating: 100 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)

All substitute parts listed below satisfy these core electrical and mechanical compatibility criteria. Variations in breaking capacity, melting I²t, DC cold resistance, and approval agencies are permitted within the scope of equivalent substitution, as these parameters do not affect form-factor compatibility or primary circuit protection function at the specified current and voltage ratings.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (mA)	Voltage Rating (V AC)	Package	Response Time	Breaking Capacity @ Rated Voltage	Melting I²t	DC Cold Resistance (Ω)	Product Status	Approval Agency
5TT 100-R	Bel Fuse Inc.	100	250	5mm x 20mm	Slow Blow	100A	0.137	18.8	Obsolete	CE, CSA, cULus
0239.100MXP	Littelfuse Inc.	100	250	5mm x 20mm	Slow Blow	35A	0.055	17.3425	Active	CE, UL
0034.3107	SCHURTER Inc.	100	250	5mm x 20mm	Slow Blow	35A	0.107	—	Active	CCC, cURus, VDE
0034.3762	SCHURTER Inc.	100	250	5mm x 20mm	Slow Blow	35A	0.128	—	Active	cULus
0034.5607.11	SCHURTER Inc.	100	250	5mm x 20mm	Slow Blow	35A	0.107	—	Active	cURus, VDE
0034.5607.22	SCHURTER Inc.	100	250	5mm x 20mm	Slow Blow	35A	0.107	—	Active	cURus, VDE
0218.100HXP	Littelfuse Inc.	100	250	5mm x 20mm	Slow Blow	35A	0.0482	8.905	Active	CCC, CE, CSA, K-MARK, SEMKO, UL, VDE
0218.100MXP	Littelfuse Inc.	100	250	5mm x 20mm	Slow Blow	35A	0.0482	8.905	Active	CCC, CE, CSA, K-MARK, SEMKO, UL, VDE
0219.100MXAP	Littelfuse Inc.	100	250	5mm x 20mm	Slow Blow	150A	0.079	6.018	Active	CE, SEMKO, UL
BK/GDC-100MA	Eaton - Electronics Division	100	250	5mm x 20mm	Slow Blow	35A	0.045	2.8	Active	cULus, IMQ
BK/S506-100-R	Eaton - Electronics Division	100	250	5mm x 20mm	Slow Blow	35A	0.045	2.8	Active	BSI, CCC, CSA, IMQ, SEMKO, UR, VDE

Engineering Selection Recommendations

All listed substitute parts are active products with current manufacturing status, providing supply chain continuity for the obsolete 5TT 100-R. Selection among equivalents should prioritize:

Compliance Alignment: The 0218.100HXP and 0218.100MXP (Littelfuse 218 series) offer the broadest approval agency coverage, including CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE certifications, matching or exceeding the original part's regulatory scope.

Regional Certification Requirements: For applications requiring specific regional approvals, the BK/S506-100-R (Eaton S506 series) provides BSI, CCC, CSA, IMQ, SEMKO, UR, and VDE certifications, supporting global deployment scenarios.

Availability and Inventory: The 0218.100MXP maintains the highest inventory level (10,490 units), ensuring procurement reliability. The 0239.100MXP (Littelfuse 239 series) and 0219.100MXAP (Littelfuse 219XA series) provide secondary sourcing options with substantial stock levels.

Electrical Performance Consistency: All substitutes maintain the 100 mA current rating and 250 V AC voltage specification. Variations in breaking capacity (35A to 150A) and melting I²t values do not affect compatibility in standard circuit protection applications operating within the specified electrical parameters.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 5TT 100-R with any of the listed parts without circuit modification?

A: Yes. All listed substitute parts share identical current rating (100 mA), voltage rating (250 V AC), package dimensions (5mm x 20mm), fuse type (cartridge, glass), response time (slow blow), and mounting requirement (holder). Physical and electrical compatibility is maintained across all substitutes.

Q: What is the difference between the Littelfuse 218 and 219XA series fuses?

A: Both series meet the core substitution criteria. The 219XA series (0219.100MXAP) features a higher breaking capacity (150A versus 35A) and lower DC cold resistance (6.018 Ω versus 8.905 Ω). Selection depends on application-specific breaking capacity requirements and circuit impedance characteristics.

Q: Are there packaging differences between substitute options?

A: The 0034.5607.22 is supplied in Tape & Reel (TR) format, suitable for automated assembly processes. All other substitutes are supplied in Bulk packaging. Form-factor and electrical specifications remain identical regardless of packaging format.

Q: Which substitute offers the best regulatory coverage for international applications?

A: The 0218.100HXP and 0218.100MXP provide the most comprehensive approval agency coverage with CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE certifications, supporting deployment across North American, European, and Asian markets.

Q: How do melting I²t values affect substitution suitability?

A: Melting I²t values indicate thermal energy absorption characteristics. Variations among substitutes (0.045 to 0.137) reflect different fuse element designs but do not affect compatibility at the specified 100 mA rating. All substitutes are qualified for the same circuit protection function.

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