Littelfuse 0217.400H Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0217.400H is a 400 mA, 250 V AC/DC glass cartridge fuse with fast-blow response characteristics, designed for 5mm x 20mm holder mounting. This part is classified as obsolete. Equivalent and substitute parts are available from active product lines within Littelfuse and from alternative manufacturers, offering improved availability and compliance status while maintaining functional compatibility.

Key Parameters

Parameter	Value
Current Rating	400 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Fast Blow
Package / Case	5mm x 20mm
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	35 A
Operating Temperature Range	-55°C to 125°C

Substitute Part Grouping Explanation

Substitution for the 0217.400H is determined by strict equivalence across the following critical parameters: current rating (400 mA), voltage rating (250 V AC), fuse type (cartridge glass), response time (fast blow), physical package (5mm x 20mm), and mounting requirement (holder-based). All substitute parts listed maintain these core electrical and mechanical specifications.

Littelfuse Series 217 parts (0217.400HXP, 0217.400MXP, 0217.400TXP, 0217.400VXP) are direct parametric equivalents with active product status and improved RoHS3 compliance. Littelfuse Series 235 parts (0235.400HXP, 0235.400MXP, 0235.400VXP) and Series 617 part (0617.400MXP) maintain identical electrical ratings and physical dimensions but exhibit different melting I²t and DC cold resistance characteristics. Eaton S500 series parts (BK/S500-400-R, BK1/S500-400-R) provide cross-manufacturer equivalence with comparable electrical performance.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating	Voltage Rating (AC)	Response Time	Package	Breaking Capacity	Melting I²t	DC Cold Resistance (Ω)	Product Status	RoHS Status
0217.400H	Littelfuse Inc.	217	400 mA	250 V	Fast Blow	5mm x 20mm	35 A	0.127	0.277	Obsolete	Non-compliant
0217.400HXP	Littelfuse Inc.	217	400 mA	250 V	Fast Blow	5mm x 20mm	35 A	0.125	0.277	Active	ROHS3 Compliant
0217.400MXP	Littelfuse Inc.	217	400 mA	250 V	Fast Blow	5mm x 20mm	35 A	0.125	0.277	Active	ROHS3 Compliant
0217.400TXP	Littelfuse Inc.	217	400 mA	250 V	Fast Blow	5mm x 20mm	35 A	0.125	0.2777	Active	ROHS3 Compliant
0217.400VXP	Littelfuse Inc.	217	400 mA	250 V	Fast Blow	5mm x 20mm	35 A	0.125	0.2777	Active	ROHS3 Compliant
0235.400HXP	Littelfuse Inc.	235	400 mA	250 V	Fast Blow	5mm x 20mm	35 A	0.05845	1.75	Active	ROHS3 Compliant
0235.400MXP	Littelfuse Inc.	235	400 mA	250 V	Fast Blow	5mm x 20mm	35 A	0.05845	1.75	Active	ROHS3 Compliant
0235.400VXP	Littelfuse Inc.	235	400 mA	250 V	Fast Blow	5mm x 20mm	35 A	0.05845	1.75	Active	ROHS3 Compliant
0617.400MXP	Littelfuse Inc.	617	400 mA	250 V	Fast Blow	5mm x 20mm	35 A	0.125	0.277	Active	ROHS3 Compliant
BK/S500-400-R	Eaton - Electronics Division	S500	400 mA	250 V	Fast Blow	5mm x 20mm	35 A	0.18	2	Active	ROHS3 Compliant
BK1/S500-400-R	Eaton - Electronics Division	S500	400 mA	250 V	Fast Blow	5mm x 20mm	35 A	0.18	2	Active	ROHS3 Compliant

Engineering Selection Recommendations

For applications requiring direct replacement of the obsolete 0217.400H, Littelfuse Series 217 active parts (0217.400HXP, 0217.400MXP, 0217.400TXP, 0217.400VXP) provide the closest functional match with identical melting I²t and DC cold resistance values. These parts carry ROHS3 compliance and maintain all required certifications (CCC, CE, CSA, K-MARK, SEMKO, UL, VDE).

Littelfuse Series 235 parts (0235.400HXP, 0235.400MXP, 0235.400VXP) are electrically equivalent but exhibit lower melting I²t (0.05845 vs. 0.127) and higher DC cold resistance (1.75 Ω vs. 0.277 Ω). These characteristics may affect circuit behavior in applications sensitive to thermal response or resistance characteristics. Certification coverage is reduced to CE, CSA, KC, and UL.

Littelfuse Series 617 part (0617.400MXP) maintains identical melting I²t and DC cold resistance to Series 217 but carries certifications CCC, CE, CSA, UR, and VDE.

Eaton S500 series parts (BK/S500-400-R, BK1/S500-400-R) provide cross-manufacturer equivalence with higher melting I²t (0.18) and DC cold resistance (2 Ω). These parts are certified by BSI, CCC, CSA, cULus, IMQ, SEMKO, and VDE.

Frequently Asked Questions (FAQ)

Q: Can Series 217, 235, and 617 Littelfuse parts be used interchangeably in the same circuit?

A: All three series maintain identical current rating (400 mA), voltage rating (250 V AC), response time (fast blow), and physical package (5mm x 20mm). However, they differ in melting I²t and DC cold resistance. Series 217 and 617 are closer matches to the original 0217.400H. Series 235 exhibits significantly different thermal and resistance characteristics and should be evaluated for circuit-specific requirements.

Q: What is the difference between Littelfuse and Eaton S500 series fuses?

A: Both maintain identical electrical ratings and physical dimensions. Eaton S500 parts exhibit higher melting I²t (0.18 vs. 0.125) and DC cold resistance (2 Ω vs. 0.277 Ω), resulting in different thermal response. Certification agencies differ between manufacturers. Selection depends on circuit design requirements and certification mandates.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All active substitute parts listed carry ROHS3 compliance status. The original 0217.400H is RoHS non-compliant.

Q: Do all substitute parts fit the same 5mm x 20mm holder?

A: Yes. All substitute parts maintain the 5mm x 20mm physical package and require the same holder mounting type as the original 0217.400H.

Q: Which substitute part has the closest thermal characteristics to the original 0217.400H?

A: Littelfuse Series 217 parts (0217.400HXP, 0217.400MXP, 0217.400TXP, 0217.400VXP) and Series 617 part (0617.400MXP) maintain melting I²t values (0.125) closest to the original specification (0.127). Series 217 parts also match the original DC cold resistance (0.277 Ω).

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