RLD60P110XFF Equivalent & Substitute Parts

Part Overview

The RLD60P110XFF is a polymeric PTC resettable fuse manufactured by Littelfuse Inc., part of the POLY-FUSE® RLD60 series. This component is rated for 60V maximum voltage with a 1.1A hold current and is designed for through-hole radial mounting in disc configuration. The part is currently obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Voltage - Max	60V
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
Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	Radial, Disc
Approval Agency	cURus, TUV
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the RLD60P110XFF is determined by the following critical parameters:

Primary Matching Criteria:

Current - Hold (Ih) (Max): 1.1 A
Current - Trip (It): 2.2 A
Time to Trip: 8.2 s
Resistance - Initial (Ri) (Min): 150 mOhms
Resistance - Post Trip (R1) (Max): 380 mOhms
Operating Temperature: -40°C ~ 85°C
Mounting Type: Through Hole
Package / Case: Radial, Disc

Secondary Consideration:

Voltage - Max: Substitute parts must meet or exceed the 60V rating

The substitute parts identified maintain identical electrical performance characteristics (hold current, trip current, trip time, and resistance values) and thermal operating range. Voltage ratings may exceed the original specification, which is acceptable in substitution scenarios. All substitutes are polymeric PTC resettable fuses with through-hole radial disc mounting.

Parameter Comparison

Parameter	RLD60P110XFF	60R110XMR	RXEF110-AP	RXEF110K-AP
Voltage - Max	60V	60V	72V	72V
Current - Hold (Ih) (Max)	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
Current - Max	40 A	40 A	40 A	40 A
Time to Trip	8.2 s	8.2 s	8.2 s	8.2 s
Resistance - Initial (Ri) (Min)	150 mOhms	150 mOhms	150 mOhms	150 mOhms
Resistance - Post Trip (R1) (Max)	380 mOhms	380 mOhms	380 mOhms	380 mOhms
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Disc	Radial, Disc	Radial, Disc	Radial, Disc
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	cURus, TUV	cURus, TUV	CQC, CSA, TUV, UL	CQC, CSA, TUV, UL

Engineering Selection Recommendations

60R110XMR (Primary Substitute)

The 60R110XMR is the closest direct equivalent to the RLD60P110XFF. Both components share identical voltage rating (60V), electrical characteristics, and thermal operating range. The 60R110XMR is part of the active POLY-FUSE® 60R series and maintains full ROHS3 compliance with cURus and TUV certifications. This part is available in high inventory (41,461 pcs) and is supplied in Cut Tape packaging. The marginal increase in seated height (0.717" vs 0.709") is within typical PCB assembly tolerances.

RXEF110-AP and RXEF110K-AP (Secondary Substitutes)

Both RXEF110-AP and RXEF110K-AP are active PolySwitch® series components with identical electrical performance to the RLD60P110XFF. These parts feature a higher voltage rating (72V), which provides additional design margin in applications where voltage headroom is beneficial. Both components carry expanded certification coverage (CQC, CSA, TUV, UL) compared to the original part. The RXEF110K-AP offers higher inventory availability (28,344 pcs) relative to RXEF110-AP (2,641 pcs). Physical dimensions are comparable, with minor variations in disc diameter and lead spacing that remain compatible with standard through-hole PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can the 60R110XMR directly replace the RLD60P110XFF without circuit modifications?

A: Yes. The 60R110XMR maintains identical electrical specifications including hold current (1.1A), trip current (2.2A), trip time (8.2s), and resistance characteristics. Both components are rated for 60V and operate across the same temperature range (-40°C to 85°C). Physical mounting is compatible with standard through-hole radial disc footprints.

Q: What is the difference between the 60R110XMR and the RXEF series substitutes?

A: The primary difference is voltage rating. The 60R110XMR matches the original 60V specification, while RXEF110-AP and RXEF110K-AP are rated for 72V. All three parts share identical hold current, trip current, trip time, and resistance values. The RXEF series includes broader certification coverage (CQC, CSA, TUV, UL vs. cURus, TUV).

Q: Are there physical dimension differences that affect PCB layout?

A: Minor variations exist. The RLD60P110XFF has a seated height of 0.709" (18.00mm) and disc diameter of 0.512" (13.00mm). The 60R110XMR seated height is 0.717" (18.20mm) with the same disc diameter. RXEF series components have a disc diameter of 0.504" (12.80mm) and seated height of 0.689" (17.50mm). These differences are within standard PCB assembly tolerances for through-hole components.

Q: Which substitute offers the best long-term availability?

A: The 60R110XMR is recommended for long-term availability as it is part of the active POLY-FUSE® 60R series with the highest current inventory (41,461 pcs). The RXEF110K-AP is the second choice with 28,344 pcs in stock.

Q: Do all substitute parts maintain ROHS3 compliance?

A: Yes. The 60R110XMR, RXEF110-AP, and RXEF110K-AP are all ROHS3 compliant. All parts are manufactured by Littelfuse Inc. and meet the same environmental compliance standards as the original RLD60P110XFF.

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