RLD60P075XF Polymeric PTC Resettable Fuse - Equivalent & Substitute Parts

Part Overview

The RLD60P075XF is a polymeric PTC resettable fuse manufactured by Littelfuse Inc., rated for 60V maximum voltage with 750 mA hold current. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design support and procurement. The RLD60 series POLY-FUSE® device provides overcurrent protection through automatic thermal reset capability in through-hole radial disc configuration.

Key Parameters

Parameter	Value
Voltage - Max	60V
Current - Hold (Ih) (Max)	750 mA
Current - Trip (It)	1.5 A
Current - Max	40 A
Time to Trip	6.3 s
Resistance - Initial (Ri) (Min)	250 mOhms
Resistance - Post Trip (R1) (Max)	600 mOhms
Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	Radial, Disc
Lead Spacing	0.201" (5.10mm)
Approval Agency	cURus, TUV
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution eligibility for the RLD60P075XF is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - Max: 60V (minimum requirement; higher voltage ratings are acceptable)
Current - Hold (Ih) (Max): 750 mA (exact match required)
Current - Trip (It): 1.5 A (exact match required)
Mounting Type: Through Hole
Package / Case: Radial, Disc
Lead Spacing: 0.201" (5.10mm)

Secondary Compatibility Parameters:

Operating Temperature: -40°C ~ 85°C
Approval Agency: cURus, TUV (or equivalent certifications)
Time to Trip: 6.3 s (tolerance acceptable within engineering standards)
Resistance - Initial (Ri) and Post Trip (R1): Within specified ranges

Substitute parts are grouped into three categories:

Category 1 - Direct Electrical Equivalents (60V, 750 mA): 60R075XPR, 60R075XU, MF-R075, PFRA.075, PFRA.075.2

Category 2 - Higher Voltage Rating (72V, 750 mA): 72R075XPR, RXEF075-AP

Category 3 - Lower Current Rating (60V, 650 mA): PFRA.065, PFRA.065.2

Parameter Comparison

Part Number	Manufacturer	Voltage - Max	Current - Hold (Ih) (Max)	Current - Trip (It)	Time to Trip	Resistance - Initial (Ri) (Min)	Resistance - Post Trip (R1) (Max)	Operating Temperature	Product Status	RoHS Status	Lead Spacing
RLD60P075XF	Littelfuse Inc.	60V	750 mA	1.5 A	6.3 s	250 mOhms	600 mOhms	-40°C ~ 85°C	Obsolete	RoHS non-compliant	0.201" (5.10mm)
60R075XPR	Littelfuse Inc.	60V	750 mA	1.5 A	6.3 s	250 mOhms	600 mOhms	-40°C ~ 85°C	Active	ROHS3 Compliant	0.201" (5.10mm)
60R075XU	Littelfuse Inc.	60V	750 mA	1.5 A	6.3 s	250 mOhms	600 mOhms	-40°C ~ 85°C	Active	ROHS3 Compliant	0.201" (5.10mm)
72R075XPR	Littelfuse Inc.	72V	750 mA	1.5 A	6.3 s	250 mOhms	600 mOhms	-40°C ~ 85°C	Active	ROHS3 Compliant	0.201" (5.10mm)
RXEF075-AP	Littelfuse	72V	750 mA	1.5 A	6.3 s	250 mOhms	600 mOhms	-40°C ~ 85°C	Active	ROHS3 Compliant	0.199" (5.05mm)
MF-R075	Bourns Inc.	60V	750 mA	1.5 A	6.3 s	180 mOhms	600 mOhms	-40°C ~ 85°C	Active	ROHS3 Compliant	0.201" (5.10mm)
PFRA.075	SCHURTER Inc.	60V	750 mA	1.5 A	6.3 s	180 mOhms	600 mOhms	-40°C ~ 85°C	Active	ROHS3 Compliant	0.201" (5.10mm)
PFRA.075.2	SCHURTER Inc.	60V	750 mA	1.5 A	6.3 s	180 mOhms	600 mOhms	-40°C ~ 85°C	Active	ROHS3 Compliant	0.201" (5.10mm)
PFRA.065	SCHURTER Inc.	60V	650 mA	1.3 A	5.3 s	270 mOhms	720 mOhms	-40°C ~ 85°C	Active	ROHS3 Compliant	0.201" (5.10mm)
PFRA.065.2	SCHURTER Inc.	60V	650 mA	1.3 A	5.3 s	270 mOhms	720 mOhms	-40°C ~ 85°C	Active	ROHS3 Compliant	0.201" (5.10mm)

Engineering Selection Recommendations

Preferred Direct Substitutes (Exact Electrical Match):

60R075XPR and 60R075XU are the primary recommended substitutes. Both are manufactured by Littelfuse Inc., maintain identical electrical specifications to the RLD60P075XF, and are classified as active products with ROHS3 compliance. The 60R075XPR is available in Cut Tape packaging, while 60R075XU is supplied in Bulk packaging. Both parts carry cURus and TUV approvals.

Alternative Substitutes (Littelfuse Series):

72R075XPR provides identical electrical performance with a higher voltage rating of 72V, suitable for applications where the circuit voltage may exceed 60V. This part is active and ROHS3 compliant.

RXEF075-AP (PolySwitch® series) offers equivalent electrical specifications at 72V with expanded approval agency certifications including CQC, CSA, TUV, and UL. Lead spacing is 0.199" (5.05mm), representing a minor dimensional variation.

Cross-Manufacturer Alternatives (60V, 750 mA):

MF-R075 (Bourns Inc., Multifuse® series) and PFRA.075 / PFRA.075.2 (SCHURTER Inc., PFRA series) provide electrical equivalence with identical voltage and current ratings. Initial resistance values differ (180 mOhms versus 250 mOhms), which may affect circuit behavior during transient conditions. All are active products with ROHS3 compliance and cURus/TUV approvals.

Lower Current Alternative (Design Consideration):

PFRA.065 and PFRA.065.2 are rated for 650 mA hold current with 1.3 A trip current. These parts are suitable only for applications where the circuit current requirement does not exceed 650 mA. Use is restricted to designs where the lower current rating is compatible with system specifications.

Frequently Asked Questions (FAQ)

Q: Can 60R075XPR directly replace RLD60P075XF in existing designs?

A: Yes. The 60R075XPR maintains identical electrical specifications (60V, 750 mA hold current, 1.5 A trip current, 6.3 s time to trip) and mechanical compatibility (through-hole radial disc, 0.201" lead spacing). The primary difference is product status (active versus obsolete) and RoHS compliance (ROHS3 compliant versus non-compliant).

Q: What is the difference between 60R075XPR and 60R075XU?

A: Both parts are electrically and mechanically identical. The difference is packaging: 60R075XPR is supplied in Cut Tape (CT), while 60R075XU is supplied in Bulk. Selection depends on procurement and assembly requirements.

Q: Can 72R075XPR or RXEF075-AP be used in a 60V circuit?

A: Yes. Both parts are rated for 72V maximum voltage, which exceeds the 60V requirement. Higher voltage-rated components are electrically compatible with lower voltage circuits. The 750 mA hold current and 1.5 A trip current specifications remain identical.

Q: What is the significance of the initial resistance (Ri) difference between Littelfuse and SCHURTER parts?

A: Littelfuse 60R075XPR specifies 250 mOhms minimum initial resistance, while SCHURTER PFRA.075 specifies 180 mOhms minimum. Both values fall within acceptable ranges for polymeric PTC fuse operation. The lower initial resistance of SCHURTER parts may result in slightly lower voltage drop during normal operation. Circuit design should account for this parameter if voltage drop is a critical specification.

Q: Are PFRA.065 and PFRA.065.2 suitable replacements?

A: PFRA.065 and PFRA.065.2 are not direct replacements. These parts are rated for 650 mA hold current and 1.3 A trip current, compared to the RLD60P075XF specification of 750 mA and 1.5 A. Use only if circuit current requirements do not exceed 650 mA and the lower trip current is compatible with system protection requirements.

Q: What certifications apply to substitute parts?

A: All recommended substitute parts carry cURus and TUV approvals, matching the RLD60P075XF certification profile. RXEF075-AP additionally carries CQC, CSA, and UL certifications, providing broader regulatory acceptance.

Q: Is RoHS compliance a requirement for substitution?

A: The RLD60P075XF is RoHS non-compliant. All recommended active substitutes are ROHS3 compliant. If RoHS compliance is mandated by design or procurement standards, any of the active substitute parts satisfy this requirement.

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