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PFRX.135 Equivalent & Substitute Parts
Part Overview
The PFRX.135 is a polymeric PTC resettable fuse manufactured by SCHURTER Inc., rated for 60V at 1.35A hold current with through-hole radial disc packaging. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing circuit protection applications. The PFRX.135 provides automatic overcurrent protection with a trip current of 2.7A and operates across the temperature range of -40°C to 85°C.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Voltage - Max | 60V |
| Current - Hold (Ih) | 1.35A |
| Current - Trip (It) | 2.7A |
| Current - Max | 40A |
| Time to Trip | 9.6s |
| Resistance - Initial (Ri) | 120 mOhms (Min) |
| Resistance - Post Trip (R1) | 300 mOhms (Max) |
| Operating Temperature | -40°C to 85°C |
| Mounting Type | Through Hole |
| Package / Case | Radial, Disc |
| Type | Polymeric |
Substitute Part Grouping Explanation
Substitute parts for the PFRX.135 are categorized based on electrical parameter compatibility and mechanical fit. The primary substitution criteria are:
Direct Electrical Equivalents maintain identical voltage (60V), hold current (1.35A), trip current (2.7A), and resistance characteristics (Ri: 120 mOhms, R1: 300 mOhms). These parts are interchangeable in applications where the exact electrical performance is required.
Voltage-Variant Equivalents share the same current ratings (1.35A hold, 2.7A trip) and resistance specifications but operate at different maximum voltages. The PFRY.135 operates at 72V and is suitable for applications with higher voltage headroom.
Current-Variant Similar Parts maintain the 60V voltage rating and identical operating temperature range but differ in hold current and trip current ratings. These include the 60R160XMR (1.6A), 60R185XMR (1.85A), 60R300XF (3A), and 60R375XH (3.75A). These are suitable only when circuit design permits higher current thresholds.
Packaging Variants of direct electrical equivalents (PTR060V0135-BK, PTR060V0135-BK1, PTR060V0135-TR1) provide the same electrical performance in different distribution formats (bulk or tape & reel).
Parametric Equivalents such as the 0ZRR0135FF1A from Bel Fuse Inc. match all electrical parameters and mechanical dimensions while offering additional certifications (AEC-Q200).
Parameter Comparison
| Part Number | Manufacturer | Voltage (Max) | Ih (A) | It (A) | Ri (mOhms) | R1 (mOhms) | Time to Trip (s) | Product Status | Packaging |
|---|---|---|---|---|---|---|---|---|---|
| PFRX.135 | SCHURTER Inc. | 60V | 1.35 | 2.7 | 120 | 300 | 9.6 | Obsolete | Radial, Disc |
| PFRY.135 | SCHURTER Inc. | 72V | 1.35 | 2.7 | 120 | 300 | 9.6 | Active | Radial, Disc |
| PTR060V0135-BK | Eaton - Electronics Division | 60V | 1.35 | 2.7 | 120 | 300 | 9.6 | Active | Radial, Disc |
| PTR060V0135-BK1 | Eaton - Electronics Division | 60V | 1.35 | 2.7 | 120 | 300 | 9.6 | Active | Radial, Disc |
| 60R135XMR | Littelfuse | 60V | 1.35 | 2.7 | 120 | 300 | 9.6 | Active | Radial, Disc |
| 60R160XMR | Littelfuse Inc. | 60V | 1.6 | 3.2 | 90 | 220 | 11.4 | Active | Radial, Disc |
| 60R185XMR | Littelfuse Inc. | 60V | 1.85 | 3.7 | 80 | 190 | 12.6 | Active | Radial, Disc |
| 60R300XF | Littelfuse Inc. | 60V | 3 | 6 | 40 | 100 | 19.8 | Active | Radial, Disc |
| 60R375XH | Littelfuse Inc. | 60V | 3.75 | 7.5 | 30 | 80 | 24 | Active | Radial, Disc |
| PTR060V0135-TR1 | Eaton - Electronics Division | 60V | 1.35 | 2.7 | 120 | 300 | 9.6 | Active | Radial, Disc |
| 0ZRR0135FF1A | Bel Fuse Inc. | 60V | 1.35 | 2.7 | 120 | 300 | 9.6 | Active | Radial, Disc |
Engineering Selection Recommendations
Direct Electrical Equivalents (Preferred for Drop-In Replacement)
PTR060V0135-BK, PTR060V0135-BK1, 60R135XMR, PTR060V0135-TR1, and 0ZRR0135FF1A are direct electrical equivalents with identical voltage, current, and resistance specifications. All are active products with current manufacturing support. PTR060V0135-BK and PTR060V0135-BK1 from Eaton are available in bulk packaging. 60R135XMR from Littelfuse is available in cut tape format. 0ZRR0135FF1A from Bel Fuse Inc. includes AEC-Q200 automotive qualification and is suitable for applications requiring automotive-grade reliability.
Voltage-Variant Equivalent
PFRY.135 from SCHURTER Inc. maintains identical current and resistance characteristics but operates at 72V maximum. This part is suitable for applications where higher voltage margin is beneficial, provided circuit design accommodates the increased voltage rating.
Current-Variant Similar Parts (Application-Dependent)
60R160XMR, 60R185XMR, 60R300XF, and 60R375XH maintain the 60V voltage rating but provide higher hold and trip current ratings. These parts are suitable only when circuit design permits higher current thresholds and the application does not require the specific 1.35A hold current of the original part.
Compliance and Certifications
All substitute parts carry RoHS3 compliance and TUV certification. PTR060V0135-TR1 carries ROHS3 compliance. 0ZRR0135FF1A includes UL certification in addition to cURus and TUV, providing broader regulatory acceptance.
Frequently Asked Questions (FAQ)
Q: Can PTR060V0135-BK be used as a direct replacement for PFRX.135?
A: Yes. PTR060V0135-BK is a direct electrical equivalent with identical voltage (60V), hold current (1.35A), trip current (2.7A), and resistance specifications. Both are polymeric PTC resettable fuses with through-hole radial disc packaging. The primary difference is packaging format (bulk vs. original inventory status).
Q: What is the difference between PFRY.135 and PFRX.135?
A: PFRY.135 operates at 72V maximum voltage compared to PFRX.135 at 60V. All other electrical parameters—hold current (1.35A), trip current (2.7A), initial resistance (120 mOhms), and post-trip resistance (300 mOhms)—are identical. PFRY.135 is suitable for applications with higher voltage requirements.
Q: Can 60R160XMR replace PFRX.135?
A: 60R160XMR is not a direct replacement. While both operate at 60V, 60R160XMR has a higher hold current (1.6A vs. 1.35A) and trip current (3.2A vs. 2.7A). Use 60R160XMR only if circuit design permits higher current thresholds.
Q: What are the key parameters that determine substitutability?
A: The critical parameters are maximum voltage, hold current (Ih), trip current (It), initial resistance (Ri), and post-trip resistance (R1). Parts with identical values for these parameters are direct electrical equivalents. Variations in any of these parameters require circuit design review.
Q: Does 0ZRR0135FF1A offer any advantages over other equivalents?
A: 0ZRR0135FF1A matches all electrical parameters of PFRX.135 and includes AEC-Q200 automotive qualification. This certification is beneficial for applications requiring automotive-grade reliability and traceability.
Q: Are there packaging considerations when selecting a substitute?
A: All substitute parts use through-hole radial disc packaging compatible with PFRX.135 PCB layouts. Packaging format differences (bulk, cut tape, tape & reel) affect procurement and assembly processes but not electrical performance or mechanical fit.
Q: What is the operating temperature range for substitute parts?
A: All listed substitute parts operate across -40°C to 85°C, matching the PFRX.135 specification.
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