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PFRA.050.2 Polymeric PTC Resettable Fuse 60V 500mA Radial
Part Overview
The PFRA.050.2 is a polymeric PTC resettable fuse manufactured by SCHURTER Inc., designed for 60V applications with a 500mA hold current rating. This component operates as a thermal protection device in through-hole radial configuration and maintains active product status with full RoHS3 compliance. Alternative equivalent and substitute parts are necessary to address supply chain flexibility, packaging preferences, and application-specific current rating requirements while maintaining electrical and mechanical compatibility.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | PFRA.050.2 |
| Manufacturer | SCHURTER Inc. |
| Voltage - Max | 60V |
| Current - Hold (Ih) (Max) | 500 mA |
| Current - Trip (It) | 1 A |
| Current - Max | 40 A |
| Mounting Type | Through Hole |
| Package / Case | Radial, Disc |
| Operating Temperature | -40°C ~ 85°C |
| RoHS Status | ROHS3 Compliant |
| Approval Agency | cURus, TUV |
Substitute Part Grouping Explanation
Substitution eligibility is determined by strict alignment of the following critical parameters:
Voltage Rating: All substitutes must maintain 60V maximum voltage specification to ensure safe operation within the same circuit protection envelope.
Current - Hold (Ih): The 500mA hold current is the primary functional specification. Direct equivalents maintain this exact rating. Similar parts with different hold current ratings (100mA, 170mA, 200mA, 250mA, 300mA, 400mA) are classified as similar alternatives suitable only when circuit design permits current rating adjustment.
Mounting Type & Package: All listed parts maintain through-hole radial disc configuration, ensuring mechanical and footprint compatibility.
Electrical Characteristics: Trip current (It), maximum current (40A), and operating temperature range (-40°C to 85°C) remain consistent across all listed parts, confirming functional interchangeability within their respective current ratings.
Compliance & Certifications: All parts maintain RoHS3 compliance and cURus/TUV approvals, meeting regulatory requirements for direct substitution.
Parameter Comparison
| Part Number | Manufacturer | Voltage (Max) | Ih (mA) | It (A) | Ri (Min) | R1 (Max) | Packaging | Approval |
|---|---|---|---|---|---|---|---|---|
| PFRA.050.2 | SCHURTER Inc. | 60V | 500 | 1 | 410 mOhms | 1.17 Ohms | Cut Tape (CT) | cURus, TUV |
| PTR060V0050-TR | Eaton - Electronics Division | 60V | 500 | 1 | 500 mOhms | 1.17 Ohms | Cut Tape (CT) | cURus, TUV |
| 60R010XPR | Littelfuse Inc. | 60V | 100 | 0.2 | 2.5 Ohms | 7.5 Ohms | Cut Tape (CT) | cURus |
| 60R017XPR | Littelfuse Inc. | 60V | 170 | 0.34 | 3.3 Ohms | 8 Ohms | Cut Tape (CT) | cURus |
| 60R017XU | Littelfuse | 60V | 170 | 0.34 | 3.3 Ohms | 8 Ohms | Bulk | cURus |
| 60R020XPR | Littelfuse Inc. | 60V | 200 | 0.4 | 1.83 Ohms | 4.4 Ohms | Cut Tape (CT) | cURus, TUV |
| 60R025XPR | Littelfuse Inc. | 60V | 250 | 0.5 | 1.25 Ohms | 3 Ohms | Cut Tape (CT) | cURus, TUV |
| 60R025XU | Littelfuse Inc. | 60V | 250 | 0.5 | 1.25 Ohms | 3 Ohms | Bulk | cURus, TUV |
| 60R030XPR | Littelfuse Inc. | 60V | 300 | 0.6 | 880 mOhms | 2.1 Ohms | Cut Tape (CT) | cURus, TUV |
| 60R040XPR | Littelfuse Inc. | 60V | 400 | 0.8 | 550 mOhms | 1.29 Ohms | Cut Tape (CT) | cURus, TUV |
| 60R040XU | Littelfuse Inc. | 60V | 400 | 0.8 | 550 mOhms | 1.29 Ohms | Bulk | cURus, TUV |
Engineering Selection Recommendations
Direct Equivalent (Identical Electrical Specification):
PTR060V0050-TR from Eaton - Electronics Division is the direct electrical equivalent to PFRA.050.2, maintaining identical 60V/500mA ratings with matching trip current and post-trip resistance specifications. Both parts carry cURus and TUV approvals. Selection between these two parts depends on packaging preference (both available in Cut Tape) and supply chain availability. Initial resistance variance (500mOhms vs. 410mOhms) falls within acceptable tolerance for equivalent functionality.
Similar Current Ratings (Littelfuse POLY-FUSE® 60R Series):
The Littelfuse 60R series provides alternative current ratings within the same 60V platform. These parts maintain identical voltage rating, mounting type, and package configuration but differ in hold current specification. Selection of 60R020XPR (200mA), 60R025XPR/60R025XU (250mA), 60R030XPR (300mA), or 60R040XPR/60R040XU (400mA) is appropriate only when circuit design accommodates the specified current rating change. All Littelfuse parts maintain cURus and TUV approvals with RoHS3 compliance.
Packaging Variants:
Littelfuse offers bulk packaging options (60R017XU, 60R025XU, 60R040XU) for identical electrical specifications as their Cut Tape counterparts. Bulk packaging selection applies to high-volume procurement scenarios where tape packaging is not required.
Frequently Asked Questions (FAQ)
Q: Can PTR060V0050-TR replace PFRA.050.2 directly in production?
A: Yes. PTR060V0050-TR is a direct electrical equivalent with identical 60V/500mA ratings, matching trip current (1A), and equivalent post-trip resistance (1.17 Ohms). Both parts carry cURus and TUV approvals. The 90mOhms difference in initial resistance (500mOhms vs. 410mOhms) does not affect functional compatibility. Mechanical dimensions are similar, supporting footprint compatibility in through-hole radial applications.
Q: What is the difference between Cut Tape (CT) and Bulk packaging?
A: Cut Tape packaging provides individual component strips suitable for automated pick-and-place assembly. Bulk packaging supplies loose components in larger quantities, typically for manual assembly or high-volume reel consolidation. Electrical specifications remain identical between packaging formats. Selection depends on assembly process requirements and procurement volume.
Q: Can I use 60R020XPR (200mA) instead of PFRA.050.2 (500mA)?
A: Substitution is possible only if circuit design permits operation at the lower 200mA hold current rating. The 60R020XPR will trip at 400mA (versus 1A for PFRA.050.2), providing more sensitive protection. This is appropriate for circuits requiring lower current thresholds but not for applications designed around the 500mA specification. Verify circuit requirements before substitution.
Q: Are all listed parts RoHS3 compliant?
A: Yes. PFRA.050.2, PTR060V0050-TR, and all Littelfuse 60R series parts listed maintain RoHS3 compliance. All parts are also REACH Unaffected, meeting current environmental and regulatory standards.
Q: What certifications do these parts carry?
A: PFRA.050.2 and PTR060V0050-TR carry both cURus and TUV approvals. Littelfuse 60R series parts carry cURus approval, with TUV approval on 60R020XPR, 60R025XPR, 60R025XU, 60R030XPR, 60R040XPR, and 60R040XU. Verify specific certification requirements for your application before selection.
Q: Do mechanical dimensions differ between PFRA.050.2 and PTR060V0050-TR?
A: Minor dimensional variations exist. PFRA.050.2 measures 0.311" diameter × 0.122" thickness (7.90mm × 3.10mm) with 0.539" seated height. PTR060V0050-TR measures 0.299" diameter × 0.118" thickness (7.60mm × 3.00mm) with identical 0.539" seated height. Lead spacing differs slightly (5.10mm vs. 5.00mm). These variations are within typical through-hole radial component tolerances and support footprint compatibility.
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