Littelfuse 60R040XU Polymeric PTC Resettable Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 60R040XU is an active polymeric PTC resettable fuse rated for 60V maximum voltage with 400 mA hold current. This through-hole radial disc component provides overcurrent protection in electronic circuits and automatically resets after fault conditions are cleared. Substitute parts are identified based on matching electrical characteristics (voltage rating, hold current, trip current) and mechanical compatibility (through-hole radial mounting, disc package, lead spacing).

Key Parameters

Parameter	60R040XU
Voltage - Max	60V
Current - Hold (Ih)	400 mA
Current - Trip (It)	800 mA
Mounting Type	Through Hole
Package / Case	Radial, Disc
Operating Temperature	-40°C ~ 85°C
Type	Polymeric

Substitute Part Grouping Explanation

Substitute parts are grouped into two categories based on electrical parameter alignment:

Category A: Direct Electrical Equivalents (60V, 400 mA Hold Current) These parts maintain identical voltage rating and hold current specifications, ensuring drop-in compatibility for the primary application:

PTR060V0040-BK (Eaton - Electronics Division)
MF-R040 (Bourns Inc.)

Category B: Higher Voltage Rating (72V–90V, 400 mA Hold Current) These parts exceed the voltage specification of the main part while maintaining the same hold current. They are suitable for applications where higher voltage headroom is required:

RXEF040 (Littelfuse, 72V)
0ZRC0040FF1E (Bel Fuse Inc., 90V)

Category C: Same Voltage, Different Hold Current (60V, Variable Current) These parts share the 60V voltage rating but differ in hold current specification. Selection depends on circuit current requirements:

PFRA.010 (SCHURTER Inc., 100 mA)
PFRA.017 (SCHURTER Inc., 170 mA)
PFRA.020 (SCHURTER Inc., 200 mA)
PFRA.025 (SCHURTER Inc., 250 mA)
PFRA.030 (SCHURTER Inc., 300 mA)
PFRA.050 (SCHURTER Inc., 500 mA)

Parameter Comparison

Part Number	Manufacturer	Voltage - Max	Current - Hold (Ih)	Current - Trip (It)	Resistance - Initial (Ri)	Resistance - Post Trip (R1)	Time to Trip	Operating Temperature	Lead Spacing	RoHS Status
60R040XU	Littelfuse Inc.	60V	400 mA	800 mA	550 mOhms	1.29 Ohms	3.8 s	-40°C ~ 85°C	0.201" (5.10mm)	ROHS3 Compliant
RXEF040	Littelfuse	72V	400 mA	800 mA	550 mOhms	1.29 Ohms	3.8 s	-40°C ~ 85°C	0.199" (5.05mm)	ROHS3 Compliant
0ZRC0040FF1E	Bel Fuse Inc.	90V	400 mA	800 mA	550 mOhms	1.29 Ohms	3.8 s	-40°C ~ 85°C	0.201" (5.10mm)	ROHS3 Compliant
PTR060V0040-BK	Eaton - Electronics Division	60V	400 mA	800 mA	550 mOhms	1.29 Ohms	3.8 s	-40°C ~ 85°C	0.197" (5.00mm)	RoHS Compliant
MF-R040	Bourns Inc.	60V	400 mA	800 mA	520 mOhms	1.29 Ohms	3.8 s	-40°C ~ 85°C	0.201" (5.10mm)	ROHS3 Compliant
PFRA.010	SCHURTER Inc.	60V	100 mA	200 mA	2.5 Ohms	7.5 Ohms	4 s	-40°C ~ 85°C	0.201" (5.10mm)	ROHS3 Compliant
PFRA.017	SCHURTER Inc.	60V	170 mA	340 mA	2 Ohms	8 Ohms	3 s	-40°C ~ 85°C	0.201" (5.10mm)	ROHS3 Compliant
PFRA.020	SCHURTER Inc.	60V	200 mA	400 mA	1.5 Ohms	4.4 Ohms	2.2 s	-40°C ~ 85°C	0.201" (5.10mm)	ROHS3 Compliant
PFRA.025	SCHURTER Inc.	60V	250 mA	500 mA	1 Ohms	3 Ohms	2.5 s	-40°C ~ 85°C	0.201" (5.10mm)	ROHS3 Compliant
PFRA.030	SCHURTER Inc.	60V	300 mA	600 mA	760 mOhms	2.1 Ohms	3 s	-40°C ~ 85°C	0.201" (5.10mm)	ROHS3 Compliant
PFRA.050	SCHURTER Inc.	60V	500 mA	1 A	410 mOhms	1.17 Ohms	4 s	-40°C ~ 85°C	0.201" (5.10mm)	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Same Electrical Specifications): PTR060V0040-BK and MF-R040 are suitable direct replacements. Both maintain 60V voltage rating and 400 mA hold current. All three parts (60R040XU, PTR060V0040-BK, MF-R040) carry active product status and ROHS3 compliance. Lead spacing tolerances are within acceptable PCB layout margins (5.00mm to 5.10mm).

For Higher Voltage Applications: RXEF040 (72V) and 0ZRC0040FF1E (90V) provide increased voltage headroom while preserving 400 mA hold current and identical trip characteristics. Both are active products with full compliance certifications. The 0ZRC0040FF1E carries AEC-Q200 automotive qualification.

For Current-Specific Applications: SCHURTER PFRA series parts (PFRA.010 through PFRA.050) allow selection based on exact circuit current requirements. All maintain 60V voltage rating and active product status. Selection should be based on the required hold current threshold for the protected circuit.

Frequently Asked Questions (FAQ)

Q: Can I use RXEF040 or 0ZRC0040FF1E as a direct replacement for 60R040XU? A: Yes, both are electrically compatible. RXEF040 and 0ZRC0040FF1E maintain the same 400 mA hold current and 800 mA trip current. The higher voltage ratings (72V and 90V respectively) provide additional safety margin in 60V circuits. Lead spacing and mounting type are identical.

Q: What is the difference between the 60R040XU and PFRA.020? A: Both are 60V rated polymeric PTC fuses, but they differ in hold current specification. The 60R040XU holds at 400 mA, while PFRA.020 holds at 200 mA. PFRA.020 trips at half the current threshold and is suitable for lower-current circuit protection. Initial resistance also differs (1.5 Ohms vs. 550 mOhms).

Q: Are all substitute parts through-hole radial disc components? A: Yes. All listed substitute parts use through-hole radial mounting with disc packaging, ensuring mechanical compatibility with PCB layouts designed for the 60R040XU.

Q: Which substitute parts have the closest lead spacing to the 60R040XU? A: The 60R040XU specifies 0.201" (5.10mm) lead spacing. RXEF040 is 0.199" (5.05mm), PTR060V0040-BK is 0.197" (5.00mm), and all SCHURTER PFRA parts are 0.201" (5.10mm). These minor variations are within standard PCB tolerance ranges.

Q: Do all substitute parts meet RoHS compliance? A: Yes. The 60R040XU and all listed substitutes are RoHS compliant. Most carry ROHS3 certification; PTR060V0040-BK carries standard RoHS compliance.

Q: What is the operating temperature range for all parts? A: All parts operate across -40°C to 85°C, ensuring consistent thermal performance across the entire substitute list.

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