PFRX.110.2 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The PFRX.110.2 is a polymeric PTC resettable fuse manufactured by SCHURTER Inc., rated for 60V maximum voltage with 1.1A hold current. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The PFRX.110.2 operates across the -40°C to 85°C temperature range and meets ROHS3 compliance requirements. Substitute parts must maintain electrical equivalence in voltage rating, current characteristics, and thermal performance while accommodating available product status and packaging options.

Key Parameters

Parameter	PFRX.110.2 Value
Voltage - Max	60V
Current - Hold (Ih) (Max)	1.1 A
Current - Trip (It)	2.2 A
Current - Max	40 A
Time to Trip	8.2 s
Resistance - Initial (Ri) (Min)	150 mOhms
Resistance - Post Trip (R1) (Max)	380 mOhms
Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	Radial, Disc
Type	Polymeric
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the PFRX.110.2 are categorized based on electrical parameter equivalence and functional compatibility. The primary substitution criteria are:

Direct Electrical Equivalents (60V, 1.1A Hold Current): Parts maintaining identical voltage rating (60V), hold current (1.1A), trip current (2.2A), and resistance characteristics (Ri ≥ 150 mOhms, R1 ≤ 380 mOhms) are classified as direct substitutes. These include PTR060V0110-TR, PTR060V0110-TR1, and 60R110XMR.

Voltage-Rated Alternatives (72V Rating): Parts with elevated voltage ratings (72V) while maintaining the same 1.1A hold current and 2.2A trip current are suitable for applications where the original 60V specification provides design margin. These include PFRY.110, RXEF110-2, and RXEF110K-2.

Current-Variant Alternatives: Parts with different hold current ratings (1.35A in 60R135XMR, 1.85A in 60R185XMR, 3A in 60R300XF, 3.75A in 60R375XH) are applicable only when circuit requirements permit higher current thresholds. These maintain the 60V voltage rating and polymeric PTC technology.

All substitute parts maintain through-hole radial disc packaging, polymeric construction, -40°C to 85°C operating temperature range, and ROHS3 compliance.

Parameter Comparison

Part Number	Manufacturer	Voltage - Max	Current - Hold (Ih)	Current - Trip (It)	Resistance - Initial (Ri)	Resistance - Post Trip (R1)	Time to Trip	Product Status	Packaging
PFRX.110.2	SCHURTER Inc.	60V	1.1 A	2.2 A	150 mOhms	380 mOhms	8.2 s	Obsolete	Radial, Disc
PFRY.110	SCHURTER Inc.	72V	1.1 A	2.2 A	150 mOhms	380 mOhms	8.2 s	Active	Radial, Disc
PTR060V0110-TR	Eaton - Electronics Division	60V	1.1 A	2.2 A	150 mOhms	380 mOhms	8.2 s	Active	Tape & Reel (TR)
PTR060V0110-TR1	Eaton - Electronics Division	60V	1.1 A	2.2 A	150 mOhms	380 mOhms	8.2 s	Active	Tape & Reel (TR)
RXEF110-2	Littelfuse	72V	1.1 A	2.2 A	150 mOhms	380 mOhms	8.2 s	Active	Cut Tape (CT)
RXEF110K-2	Littelfuse	72V	1.1 A	2.2 A	150 mOhms	380 mOhms	8.2 s	Active	Cut Tape (CT)
60R110XMR	Littelfuse Inc.	60V	1.1 A	2.2 A	150 mOhms	380 mOhms	8.2 s	Active	Cut Tape (CT)
60R135XMR	Littelfuse	60V	1.35 A	2.7 A	120 mOhms	300 mOhms	9.6 s	Active	Cut Tape (CT)
60R185XMR	Littelfuse Inc.	60V	1.85 A	3.7 A	80 mOhms	190 mOhms	12.6 s	Active	Cut Tape (CT)
60R300XF	Littelfuse Inc.	60V	3 A	6 A	40 mOhms	100 mOhms	19.8 s	Active	Bulk
60R375XH	Littelfuse Inc.	60V	3.75 A	7.5 A	30 mOhms	80 mOhms	24 s	Active	Bulk

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement):

PTR060V0110-TR and PTR060V0110-TR1 from Eaton are the preferred direct substitutes, maintaining identical 60V voltage rating and 1.1A hold current specifications. Both parts are active products with cURus and TUV certifications. PTR060V0110-TR is available in Tape & Reel packaging, while PTR060V0110-TR1 offers the same electrical performance. 60R110XMR from Littelfuse provides equivalent electrical characteristics with active product status, cURus and TUV approvals, and Cut Tape packaging.

Secondary Substitutes (Voltage-Rated Alternatives):

PFRY.110 from SCHURTER Inc. maintains the same manufacturer lineage with active product status. The 72V rating provides voltage margin for 60V applications. RXEF110-2 and RXEF110K-2 from Littelfuse (PolySwitch® series) offer 72V ratings with identical 1.1A hold current and 2.2A trip current. Both carry CQC, CSA, TUV, and UL certifications with active product status.

Current-Variant Alternatives (Application-Dependent):

60R135XMR, 60R185XMR, 60R300XF, and 60R375XH are suitable only when circuit design permits higher hold current thresholds. These parts maintain 60V voltage rating and active product status but introduce different trip characteristics and physical dimensions. Selection requires verification that the higher current rating does not compromise circuit protection intent.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and EAR99 ECCN classification. Littelfuse parts carry MSL 1 (Unlimited) moisture sensitivity ratings, while SCHURTER and Eaton parts are not applicable for MSL. All parts are REACH Unaffected.

Frequently Asked Questions (FAQ)

Q: Can PFRY.110 replace PFRX.110.2 in a 60V circuit?

A: Yes. PFRY.110 maintains identical hold current (1.1A), trip current (2.2A), and resistance characteristics. The 72V voltage rating is compatible with 60V applications, providing additional voltage margin. Physical dimensions differ slightly; verify PCB layout compatibility.

Q: What is the difference between PTR060V0110-TR and PTR060V0110-TR1?

A: Both parts are electrically identical with 60V, 1.1A hold current specifications. The primary difference is packaging designation (TR vs. TR1). Verify with Eaton documentation for specific reel configuration requirements.

Q: Are 60R135XMR, 60R185XMR, 60R300XF, and 60R375XH direct replacements?

A: No. These parts have different hold current ratings (1.35A, 1.85A, 3A, and 3.75A respectively) and altered trip characteristics. Use only when circuit requirements explicitly permit higher current thresholds. Substitution requires circuit analysis to confirm protection objectives remain met.

Q: What packaging options are available?

A: Direct electrical equivalents are available in Tape & Reel (PTR060V0110-TR, PTR060V0110-TR1), Cut Tape (60R110XMR, RXEF110-2, RXEF110K-2), and Bulk (PFRY.110, 60R300XF, 60R375XH) formats. Select based on assembly process requirements.

Q: Which substitute has the highest inventory availability?

A: 60R110XMR from Littelfuse has 41,461 pieces in stock. RXEF110K-2 has 2,677 pieces, and RXEF110-2 has 2,280 pieces. PTR060V0110-TR has 919 pieces, and PTR060V0110-TR1 has 833 pieces.

Q: Do all substitutes meet the same certifications as PFRX.110.2?

A: PFRX.110.2 carries CSA, TUV, and UR approvals. PTR060V0110-TR and PTR060V0110-TR1 carry cURus and TUV. 60R110XMR carries cURus and TUV. RXEF110-2 and RXEF110K-2 carry CQC, CSA, TUV, and UL. Verify certification requirements for your application before selection.

Q: Can I use RXEF110-2 or RXEF110K-2 in place of PFRX.110.2?

A: Yes, with voltage margin consideration. Both parts maintain 1.1A hold current and 2.2A trip current with 72V rating. Physical dimensions are slightly different (0.504" diameter vs. 0.512" for PFRX.110.2). Confirm PCB layout and lead spacing (0.199" vs. 0.201") compatibility.

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