RXE110 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The RXE110 is a polymeric PTC resettable fuse manufactured by Littelfuse Inc., rated for 72V at 1.1A hold current with a radial, disc package configuration. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The RXE110 belongs to the PolySwitch® RXE series and is designed for through-hole mounting applications requiring overcurrent protection with automatic reset capability.

Key Parameters

Parameter	Value
Voltage - Max	72V
Current - Hold (Ih) (Max)	1.1 A
Current - Trip (It)	2.2 A
Current - Max	40 A
Time to Trip	8.2 s
Resistance - Initial (Ri) (Min)	150 mOhms
Resistance - Post Trip (R1) (Max)	380 mOhms
Mounting Type	Through Hole
Package / Case	Radial, Disc
Lead Spacing	0.199" (5.05mm)

Substitute Part Grouping Explanation

Substitution eligibility for the RXE110 is determined by the following critical parameters:

Voltage Rating (Max): Must equal or exceed 72V to maintain circuit protection integrity
Current - Hold (Ih): Must equal 1.1A to ensure proper hold current characteristics
Current - Trip (It): Must equal 2.2A for consistent trip behavior
Mounting Type: Must be Through Hole to ensure PCB compatibility
Package / Case: Must be Radial, Disc to fit existing board layouts
Lead Spacing: Tolerance of ±0.01" (0.25mm) acceptable for through-hole mounting

Substitute parts are grouped into two categories:

Direct Equivalents (identical electrical and mechanical specifications):

RXEF110 (Littelfuse Inc., PolySwitch® RXEF series, Active status)
MF-RX110/72-0 (Bourns Inc., Multifuse® MF-RX/72 series, Active status)

Functional Alternatives (meet core electrical requirements with voltage or dimensional variations):

60R110XU (Littelfuse Inc., POLY-FUSE® 60R series, 60V rating, Active status)
0ZRC0110FF1A (Bel Fuse Inc., 0ZRC series, 90V rating, Active status)
MF-R110 (Bourns Inc., Multifuse® MF-R series, 30V rating, Active status)

Parameter Comparison

Parameter	RXE110	RXEF110	60R110XU	0ZRC0110FF1A	MF-RX110/72-0	MF-R110
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Bel Fuse Inc.	Bourns Inc.	Bourns Inc.
Voltage - Max	72V	72V	60V	90V	72V	30V
Current - Hold (Ih) (Max)	1.1 A	1.1 A	1.1 A	1.1 A	1.1 A	1.1 A
Current - Trip (It)	2.2 A	2.2 A	2.2 A	2.2 A	2.2 A	2.2 A
Current - Max	40 A	40 A	40 A	40 A	40 A	40 A
Time to Trip	8.2 s	8.2 s	8.2 s	8.2 s	8.2 s	6.6 s
Resistance - Initial (Ri) (Min)	150 mOhms	150 mOhms	150 mOhms	150 mOhms	150 mOhms	100 mOhms
Resistance - Post Trip (R1) (Max)	380 mOhms	380 mOhms	380 mOhms	380 mOhms	380 mOhms	270 mOhms
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Disc	Radial, Disc	Radial, Disc	Radial, Disc	Radial, Disc	Radial, Disc
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical and Mechanical Specifications):

RXEF110 is the primary direct equivalent. It maintains all electrical parameters of the RXE110 while offering Active product status and ROHS3 compliance. Lead spacing is 0.200" (5.08mm), within acceptable tolerance of the original 0.199" (5.05mm). This part is available in Bag packaging with 1,640 units in stock.

MF-RX110/72-0 provides an alternative direct equivalent from Bourns Inc. with identical voltage, current, and trip characteristics. Lead spacing is 0.201" (5.10mm), also within tolerance. This part is available in Bulk packaging with 3,200 units in stock and carries cURus and TUV approvals.

For Voltage-Constrained Applications:

60R110XU is suitable for applications where the circuit voltage does not exceed 60V. All electrical parameters match the RXE110 except voltage rating. This part is available in Bulk packaging with 2,762 units in stock.

0ZRC0110FF1A accommodates applications requiring higher voltage margin, rated at 90V. This part includes AEC-Q200 rating and is available in Box packaging with 5,491 units in stock.

For Lower Voltage Applications:

MF-R110 is applicable only to circuits operating at 30V or below. This part exhibits different time-to-trip (6.6s vs. 8.2s) and resistance characteristics (100 mOhms initial, 270 mOhms post-trip), making it unsuitable for 72V circuits.

All substitute parts listed carry ROHS3 compliance, addressing the RoHS non-compliance status of the obsolete RXE110.

Frequently Asked Questions (FAQ)

Q: Can RXEF110 be used as a direct replacement for RXE110?

A: Yes. RXEF110 matches all critical electrical parameters (72V, 1.1A hold, 2.2A trip, 8.2s time to trip) and mechanical specifications (through-hole, radial disc package). Lead spacing tolerance is within acceptable limits for PCB mounting. RXEF110 is Active status with ROHS3 compliance.

Q: What is the difference between RXEF110 and MF-RX110/72-0?

A: Both are direct electrical equivalents with identical voltage, current, and trip characteristics. The primary differences are manufacturer (Littelfuse vs. Bourns), series designation (PolySwitch® RXEF vs. Multifuse® MF-RX/72), and physical dimensions. MF-RX110/72-0 is slightly smaller (0.427" L vs. 0.504" Dia) but maintains compatible lead spacing. Selection depends on PCB layout constraints and supplier availability.

Q: Can 60R110XU be used in a 72V circuit?

A: No. 60R110XU is rated for maximum 60V operation. Using it in a 72V circuit exceeds its voltage rating and compromises protection integrity. This part is suitable only for circuits operating at 60V or below.

Q: Is 0ZRC0110FF1A compatible with 72V circuits?

A: Yes. 0ZRC0110FF1A is rated for 90V maximum, exceeding the 72V requirement. All electrical parameters (1.1A hold, 2.2A trip, 8.2s time to trip) match the RXE110. This part provides additional voltage margin and includes AEC-Q200 rating for automotive applications.

Q: Why does MF-R110 have different time-to-trip and resistance values?

A: MF-R110 is designed for 30V circuits and exhibits different thermal and electrical characteristics optimized for lower voltage operation. Time-to-trip is 6.6s (vs. 8.2s) and initial resistance is 100 mOhms (vs. 150 mOhms). These differences make it unsuitable for 72V applications where the RXE110 specifications are required.

Q: What packaging options are available for substitute parts?

A: RXEF110 is supplied in Bag packaging. MF-RX110/72-0 and MF-R110 are supplied in Bulk packaging. 60R110XU is supplied in Bulk packaging. 0ZRC0110FF1A is supplied in Box packaging. Packaging selection does not affect electrical or mechanical compatibility; it reflects supplier distribution format.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance. The original RXE110 is RoHS non-compliant, making ROHS3-compliant substitutes necessary for applications subject to RoHS regulations.

Q: What approval agencies certify these substitute parts?

A: RXEF110 carries CQC, CSA, TUV, and UL approvals. MF-RX110/72-0 carries cURus and TUV approvals. 60R110XU carries cURus and TUV approvals. 0ZRC0110FF1A carries cURus and TUV approvals and includes AEC-Q200 rating. MF-R110 carries cURus and TUV approvals. Selection based on required certifications for specific applications.

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