PFRA.110.2 Polymeric PTC Resettable Fuse 30V Radial Disc Equivalent & Substitute Parts

Part Overview

The PFRA.110.2 is a polymeric PTC resettable fuse manufactured by SCHURTER Inc., designed for 30V applications with a 2.2 A trip current and radial disc through-hole mounting. This component is active in production and widely used in circuit protection applications requiring automatic reset capability after fault conditions are cleared.

Equivalent and substitute parts are identified based on matching electrical characteristics (voltage rating, trip current, hold current, and resistance parameters) and mechanical compatibility (through-hole radial disc package, lead spacing, and physical dimensions). Alternative sources and packaging formats are available from Littelfuse Inc., a primary manufacturer of polymeric PTC resettable fuses in the 30R series.

Substiute Parts

PFRA.110.2

SCHURTER Inc.In Stock: 1100PFRA.110.2 Datasheet

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30R110UPR

Littelfuse Inc.In Stock: 320930R110UPR Datasheet

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30R110UU

Littelfuse Inc.In Stock: 217830R110UU Datasheet

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30R135UPR

Littelfuse Inc.In Stock: 396830R135UPR Datasheet

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30R135UU

Littelfuse Inc.In Stock: 122330R135UU Datasheet

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30R160UPR

Littelfuse Inc.In Stock: 1238430R160UPR Datasheet

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30R185UPR

Littelfuse Inc.In Stock: 626130R185UPR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PFRA.110.2 are grouped based on the following substitution criteria:

Primary Substitution Parameters:

• Voltage rating: 30V maximum (exact match required)
• Mounting type: Through hole radial disc (exact match required)
• Lead spacing: 0.201" (5.10mm) (exact match required)
• Approval agencies: cURus and TUV certification (required for regulatory compliance)
• RoHS compliance: ROHS3 compliant (required for environmental standards)

Secondary Electrical Parameters (Allow Variation Within Limits):

• Current - Hold (Ih): Determines safe operating current; substitutes with lower or equal Ih are acceptable
• Current - Trip (It): Determines fault detection threshold; substitutes with matching or higher It are acceptable
• Resistance - Initial (Ri): Lower initial resistance reduces voltage drop; substitutes with lower or equal Ri are acceptable
• Resistance - Post Trip (R1): Lower post-trip resistance reduces fault voltage; substitutes with lower or equal R1 are acceptable
• Time to Trip: Determines response speed; substitutes with equal or faster response are acceptable

The Littelfuse 30R series parts listed below meet all primary substitution criteria and are mechanically and electrically compatible with the PFRA.110.2 for through-hole radial disc applications.

Parameter Comparison

Engineering Selection Recommendations

Direct Electrical Equivalents (Matching Trip Current):

The 30R110UPR and 30R110UU from Littelfuse are direct electrical equivalents to the PFRA.110.2, both featuring a 2.2 A trip current and 6.6 s time to trip. These parts are suitable for applications requiring identical fault detection characteristics. The 30R110UPR is supplied in cut tape packaging, while the 30R110UU is supplied in bulk packaging. Both are ROHS3 compliant and hold cURus and TUV certifications.

Higher Current Rating Alternatives:

The 30R135UPR, 30R135UU, 30R160UPR, and 30R185UPR offer progressively higher hold currents (1.35 A, 1.6 A, and 1.85 A respectively) and correspondingly higher trip currents (2.7 A, 3.2 A, and 3.7 A). These parts are suitable for applications where higher normal operating currents are present, provided the circuit design accommodates the higher trip thresholds. All substitute parts maintain the same 30V voltage rating, through-hole radial disc package, and regulatory certifications as the PFRA.110.2.

Packaging Considerations:

Cut tape (CT) packaging is suitable for automated assembly processes, while bulk packaging is suitable for manual assembly or reel-fed processes. Selection between 30R110UPR and 30R110UU depends on assembly methodology rather than electrical performance.

Compliance and Certification:

All listed substitute parts maintain ROHS3 compliance and cURus/TUV certifications, ensuring regulatory compatibility with the original PFRA.110.2 specification.

Frequently Asked Questions (FAQ)

Q: Can I use a 30R135UPR as a direct replacement for the PFRA.110.2?

A: The 30R135UPR is mechanically compatible and meets all regulatory requirements. However, it has a higher trip current (2.7 A versus 2.2 A), which means the circuit will tolerate higher fault currents before the fuse trips. Use this part only if your circuit design accommodates the higher trip threshold.

Q: What is the difference between 30R110UPR and 30R110UU?

A: Both parts are electrically identical with matching 2.2 A trip current and 6.6 s response time. The difference is packaging: 30R110UPR is supplied in cut tape format for automated assembly, while 30R110UU is supplied in bulk format. Select based on your assembly process requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed Littelfuse 30R series parts are ROHS3 compliant and hold cURus and TUV certifications, matching the regulatory status of the PFRA.110.2.

Q: Why do substitute parts have lower initial resistance values?

A: Lower initial resistance (Ri) reduces voltage drop across the fuse during normal operation, improving circuit efficiency. The PFRA.110.2 specifies a minimum of 100 mOhms, while Littelfuse 30R series parts range from 30 to 50 mOhms. This is an improvement in performance and does not affect substitutability.

Q: Can I use a higher current rating fuse if my circuit only draws 1.1 A?

A: Yes, provided your circuit design does not require the specific 2.2 A trip threshold of the PFRA.110.2. Higher current rating fuses (30R135UPR, 30R160UPR, 30R185UPR) will not trip at 1.1 A normal operating current but will trip at their respective higher thresholds. Confirm that your fault protection strategy remains effective with the higher trip current.

Q: Are the physical dimensions of all substitute parts identical?

A: Physical dimensions vary slightly among the 30R series. All parts maintain the same 0.201" (5.10mm) lead spacing and radial disc package format. Height and length dimensions vary: 30R110UPR/UU are 7.40mm long, 30R135UPR/UU are 8.90mm long, 30R160UPR is 8.90mm long, and 30R185UPR is 10.20mm long. Confirm PCB layout compatibility before substitution.

Q: What is the difference between Current - Hold (Ih) and Current - Trip (It)?

A: Current - Hold (Ih) is the maximum continuous current the fuse can carry without tripping. Current - Trip (It) is the fault current threshold at which the fuse activates. For the PFRA.110.2, the trip current is 2.2 A. Littelfuse 30R110 parts have an Ih of 1.1 A, meaning they safely carry up to 1.1 A continuously and trip when fault current reaches 2.2 A.