PFRX.250 Equivalent & Substitute Parts

Part Overview

The PFRX.250 is a polymeric PTC resettable fuse rated for 60V at 2.5A hold current, manufactured by SCHURTER Inc. in a through-hole radial disc package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

PTC resettable fuses provide automatic overcurrent protection by increasing resistance when current exceeds the trip threshold, then resetting when the fault condition clears. The PFRX.250 trips at 5A and returns to normal operation within the specified time-to-trip window of 15.6 seconds.

Key Parameters

Parameter	Value
Voltage Rating (Max)	60V
Current - Hold (Ih)	2.5A
Current - Trip (It)	5A
Current - Max	40A
Time to Trip	15.6s
Resistance - Initial (Ri)	50 mOhms (Min)
Resistance - Post Trip (R1)	130 mOhms (Max)
Operating Temperature Range	-40°C to 85°C
Mounting Type	Through Hole
Package / Case	Radial, Disc
Lead Spacing	0.402" (10.20mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the PFRX.250 are classified into two categories based on electrical and mechanical compatibility:

Direct Substitutes share identical electrical specifications: 60V maximum voltage, 2.5A hold current, 5A trip current, 15.6 second time-to-trip, 50 mOhms initial resistance, and 130 mOhms maximum post-trip resistance. These parts maintain the same through-hole radial disc package with 0.402" lead spacing and -40°C to 85°C operating temperature range. Direct substitutes differ only in manufacturer, product status (active vs. obsolete), and packaging format (bulk vs. tape & reel).

Parametric Equivalents maintain the same electrical performance specifications but may differ in physical dimensions, lead spacing, or packaging. These parts are suitable when circuit board layout permits minor dimensional variations.

Similar Parts share the same voltage rating and package type but differ in current rating or time-to-trip characteristics. These are listed for reference when design requirements allow for alternative current protection levels.

Parameter Comparison

Part Number	Manufacturer	Voltage (Max)	Ih (Max)	It	Ri (Min)	R1 (Max)	Time to Trip	Lead Spacing	Product Status	RoHS
PFRX.250	SCHURTER Inc.	60V	2.5A	5A	50 mOhms	130 mOhms	15.6s	0.402"	Obsolete	ROHS3
PFRY.250	SCHURTER Inc.	72V	2.5A	5A	50 mOhms	130 mOhms	15.6s	0.402"	Active	ROHS3
60R250XF	Littelfuse Inc.	60V	2.5A	5A	50 mOhms	130 mOhms	15.6s	0.402"	Active	ROHS3
72R250XF	Littelfuse	72V	2.5A	5A	50 mOhms	130 mOhms	15.6s	0.402"	Active	ROHS3
PTR060V0250-BK	Eaton - Electronics Division	60V	2.5A	5A	50 mOhms	130 mOhms	15.6s	0.394"	Active	RoHS Compliant
PTR060V0250-BK1	Eaton - Electronics Division	60V	2.5A	5A	50 mOhms	130 mOhms	15.6s	0.394"	Active	RoHS Compliant
PTR060V0250-TR1	Eaton - Electronics Division	60V	2.5A	5A	50 mOhms	130 mOhms	15.6s	0.394"	Active	ROHS3
0ZRR0250FF1A	Bel Fuse Inc.	60V	2.5A	5A	50 mOhms	130 mOhms	15.6s	0.402"	Active	ROHS3

Engineering Selection Recommendations

Primary Direct Substitutes (Identical Electrical & Mechanical Specifications):

The 60R250XF (Littelfuse) and 0ZRR0250FF1A (Bel Fuse) are the preferred direct replacements for PFRX.250. Both maintain 60V rating, 2.5A hold current, 0.402" lead spacing, and all electrical parameters. Both are active products with ROHS3 compliance and established supply availability.

Voltage-Rated Alternatives:

The PFRY.250 (SCHURTER) and 72R250XF (Littelfuse) provide 72V maximum voltage with identical current and resistance characteristics. These are suitable for circuits where higher voltage margin is acceptable or beneficial. Both are active products with full compliance certifications.

Lead Spacing Consideration:

The Eaton PTR060V0250-BK, PTR060V0250-BK1, and PTR060V0250-TR1 series maintain 60V rating and 2.5A specifications but use 0.394" lead spacing versus the original 0.402". This 0.008" difference requires verification against PCB hole patterns before selection.

Product Status Priority:

All recommended substitutes are active products, ensuring long-term availability and supply chain stability compared to the obsolete PFRX.250.

Frequently Asked Questions (FAQ)

Q: Can I use a 72V-rated fuse in place of the 60V PFRX.250?

A: Yes. The PFRY.250 and 72R250XF both maintain identical current ratings (2.5A hold, 5A trip) and resistance characteristics. Higher voltage rating provides additional safety margin in the circuit. Verify that your circuit design does not depend on the lower voltage threshold for system operation.

Q: What is the difference between lead spacing options?

A: The PFRX.250 uses 0.402" lead spacing. Eaton alternatives use 0.394" spacing—a 0.008" difference. Verify your PCB hole pattern accommodates this variation before selection. Most through-hole designs tolerate this tolerance, but measurement is required.

Q: Are all substitutes RoHS compliant?

A: Yes. The PFRX.250 is ROHS3 compliant. All direct substitutes (60R250XF, 72R250XF, 0ZRR0250FF1A, PFRY.250, PTR060V0250-TR1) are ROHS3 compliant. The Eaton PTR060V0250-BK and PTR060V0250-BK1 are RoHS compliant. All meet environmental regulations for new designs.

Q: What certifications should I verify for my application?

A: The PFRX.250 carries CSA, TUV, and UR approvals. Littelfuse and Bel Fuse substitutes carry cURus and TUV approvals. Eaton parts carry cURus and TUV approvals. Verify that your application requirements align with these agency certifications before final selection.

Q: Can I use parts with different current ratings as substitutes?

A: No. The 60R185XMR (1.85A), 60R300XF (3A), and 60R375XH (3.75A) are listed as similar parts for reference only. These have different trip currents and time-to-trip characteristics. Use these only if your circuit design specifically requires different protection levels.

Q: What is the difference between bulk and tape & reel packaging?

A: Bulk packaging is suitable for manual assembly or small-volume production. Tape & reel packaging (PTR060V0250-TR1) is optimized for automated pick-and-place assembly. Both contain identical components; packaging choice depends on your manufacturing process.

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