Littelfuse 06171.25MXP Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 06171.25MXP is a 1.25 A, 250 V AC/DC glass cartridge fuse in 5mm x 20mm form factor with fast-blow response characteristics. This fuse is designed for circuit protection in applications requiring reliable overcurrent interruption at rated voltage. The part maintains active product status with 5400 units in current inventory. Equivalent and substitute parts are identified to support procurement flexibility, supply chain continuity, and application-specific compliance requirements across multiple manufacturers and series designations.

Key Parameters

Parameter	Value
Current Rating	1.25 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm
Response Time	Fast Blow
Mounting Type	Requires Holder
Operating Temperature Range	-55°C to 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 06171.25MXP is determined by strict equivalence across the following parameters: current rating (1.25 A), voltage rating (250 V AC), fuse type (cartridge glass), physical package (5mm x 20mm), response time (fast blow), and mounting requirement (requires holder). All identified substitutes maintain these core electrical and mechanical specifications. Variations in breaking capacity, melting I²t, DC cold resistance, and approval agency certifications are documented but do not preclude functional substitution within the defined parameter set. Operating temperature range (-55°C to 125°C) and RoHS3 compliance are maintained across all substitute options.

Parameter Comparison

Manufacturer 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)	Operating Temperature	RoHS Status	Inventory (Pcs)
06171.25MXP	Littelfuse Inc.	617	1.25	250	5mm x 20mm	Fast Blow	35	2.23	0.0701	-55°C ~ 125°C	ROHS3 Compliant	5400
02171.25MXP	Littelfuse Inc.	217	1.25	250	5mm x 20mm	Fast Blow	35	2.23	0.0701	-55°C ~ 125°C	ROHS3 Compliant	5025
02171.25VXP	Littelfuse Inc.	217	1.25	250	5mm x 20mm	Fast Blow	35	2.23	0.0701	-55°C ~ 125°C	ROHS3 Compliant	831
02351.25HXP	Littelfuse Inc.	235	1.25	250	5mm x 20mm	Fast Blow	100	1.085	0.1055	-55°C ~ 125°C	ROHS3 Compliant	1372
02351.25MXP	Littelfuse Inc.	235	1.25	250	5mm x 20mm	Fast Blow	100	1.085	0.1055	-55°C ~ 125°C	ROHS3 Compliant	2630
0034.1517	SCHURTER Inc.	FSF 5x20	1.25	250	5mm x 20mm	Fast Blow	35	1.81	Not Specified	-55°C ~ 125°C	ROHS3 Compliant	1951
FSD-1.25A	OptiFuse	FSD	1.25	250	5mm x 20mm	Fast Blow	35	1.81	Not Specified	-55°C ~ 125°C	ROHS3 Compliant	2061

Engineering Selection Recommendations

All identified substitute parts maintain active product status and ROHS3 compliance. Selection among substitutes should be based on approval agency certifications required by the end application. The 06171.25MXP, 02171.25MXP, and 02171.25VXP (Littelfuse Series 617 and 217) share identical electrical characteristics including breaking capacity (35 A) and melting I²t (2.23). The 02351.25HXP and 02351.25MXP (Littelfuse Series 235) provide higher breaking capacity (100 A) with lower melting I²t (1.085) and increased DC cold resistance (0.1055 Ohms). The SCHURTER 0034.1517 and OptiFuse FSD-1.25A provide equivalent core electrical parameters with melting I²t of 1.81. Approval agency coverage varies: Littelfuse Series 617 includes CCC, CE, CSA, UR, and VDE; Littelfuse Series 217 and 235 include broader certifications (BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, VDE for Series 217; CE, CSA, KC, PSE, UL for Series 235); SCHURTER includes CCC, cURus, PSE/JET, VDE; OptiFuse includes cURus and IEC 60127. Inventory availability ranges from 831 to 5400 units across all options.

Frequently Asked Questions (FAQ)

Q: What defines a valid substitute for the 06171.25MXP? A: A valid substitute must maintain 1.25 A current rating, 250 V AC voltage rating, glass cartridge fuse type, 5mm x 20mm physical package, fast-blow response time, and require a holder for mounting. All listed parts meet these criteria.

Q: Are there differences in breaking capacity among the substitutes? A: Yes. The 06171.25MXP, 02171.25MXP, 02171.25VXP, 0034.1517, and FSD-1.25A have 35 A breaking capacity. The 02351.25HXP and 02351.25MXP have 100 A breaking capacity. Breaking capacity differences do not affect substitution eligibility but may influence application-specific performance characteristics.

Q: How do melting I²t values differ across substitutes? A: The 06171.25MXP, 02171.25MXP, and 02171.25VXP have melting I²t of 2.23. The 02351.25HXP and 02351.25MXP have melting I²t of 1.085. The 0034.1517 and FSD-1.25A have melting I²t of 1.81. These variations reflect different thermal response characteristics but do not preclude functional substitution within the defined parameter set.

Q: Which substitute offers the broadest approval agency coverage? A: The Littelfuse Series 217 parts (02171.25MXP and 02171.25VXP) provide the most comprehensive approval agency certifications, including BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, and VDE.

Q: Can I substitute based on inventory availability alone? A: No. Substitution must be based on electrical and mechanical parameter equivalence. Inventory availability (ranging from 831 to 5400 units) is a secondary consideration for procurement planning.

Q: Are all substitutes RoHS3 compliant? A: Yes. All identified substitute parts maintain ROHS3 compliance status.

Q: What is the significance of DC cold resistance variations? A: DC cold resistance is provided for the 06171.25MXP (0.0701 Ohms), 02171.25MXP (0.0701 Ohms), 02171.25VXP (0.0701 Ohms), 02351.25HXP (0.1055 Ohms), and 02351.25MXP (0.1055 Ohms). This parameter is not specified for the SCHURTER 0034.1517 and OptiFuse FSD-1.25A. Variations do not affect substitution eligibility but may be relevant for specific circuit design considerations.

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