PFRA.040 Polymeric PTC Resettable Fuse 60V 400mA Radial

Part Overview

The PFRA.040 is a polymeric PTC resettable fuse manufactured by SCHURTER Inc., rated for 60V maximum voltage with a 400 mA hold current. This through-hole radial disc component provides overcurrent protection with automatic reset capability after fault clearance. The part is active in production status and ROHS3 compliant. Equivalent and substitute parts are identified based on matching electrical characteristics, mechanical form factor, and thermal operating parameters to ensure direct functional interchangeability in circuit protection applications.

Substiute Parts

PFRA.040

SCHURTER Inc.In Stock: 1111PFRA.040 Datasheet

Current PartRFQ

60R010XPR

Littelfuse Inc.In Stock: 349360R010XPR Datasheet

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60R017XPR

Littelfuse Inc.In Stock: 305760R017XPR Datasheet

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60R017XU

LittelfuseIn Stock: 128760R017XU Datasheet

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60R020XPR

Littelfuse Inc.In Stock: 330360R020XPR Datasheet

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60R025XPR

Littelfuse Inc.In Stock: 406160R025XPR Datasheet

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60R025XU

Littelfuse Inc.In Stock: 3026760R025XU Datasheet

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60R030XPR

Littelfuse Inc.In Stock: 533560R030XPR Datasheet

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60R040XPR

Littelfuse Inc.In Stock: 654960R040XPR Datasheet

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60R040XU

Littelfuse Inc.In Stock: 103460R040XU Datasheet

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MF-R040

Bourns Inc.In Stock: 11844MF-R040 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Direct Electrical Equivalents match all critical parameters: 60V maximum voltage, 400 mA hold current, 800 mA trip current, 3.8 s time to trip, and identical resistance specifications (Ri min 520 mOhms, R1 max 1.29 Ohms). These parts are functionally identical and interchangeable without circuit modification.

Parametric Equivalents maintain the same voltage rating, mounting type, and package form factor but may originate from different manufacturers. They satisfy the same electrical protection requirements and mechanical constraints.

Similar Current-Rated Alternatives share the 60V voltage rating and radial disc package but operate at different hold current levels (100 mA through 300 mA). These are suitable only when circuit design permits operation at the specified alternative current rating.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitutes (No Circuit Modification Required)

60R040XPR, 60R040XU, and MF-R040 are direct functional equivalents to PFRA.040. All three maintain 60V voltage rating, 400 mA hold current, 800 mA trip current, and 3.8 s trip time. Initial resistance variance between PFRA.040 (520 mOhms) and Littelfuse 60R040 series (550 mOhms) is within acceptable tolerance for circuit protection applications. MF-R040 from Bourns matches PFRA.040 specifications exactly, including initial resistance. All substitute parts carry cURus and TUV certifications and are ROHS3 compliant. Packaging options include both Cut Tape and Bulk formats to accommodate procurement requirements.

Current-Rated Alternatives (Circuit Design Verification Required)

60R030XPR and 60R025XU provide lower current protection at 300 mA and 250 mA respectively. These are suitable only when circuit design permits reduced hold current operation. 60R020XPR and 60R017XPR offer further current reduction at 200 mA and 170 mA. Selection of lower-rated alternatives requires verification that normal circuit operating current remains below the specified hold current threshold to prevent nuisance trips.

Compliance and Certification

All listed substitute parts maintain ROHS3 compliance and carry appropriate regulatory approvals (cURus, TUV). Operating temperature range remains consistent at -40°C to 85°C across all alternatives, ensuring thermal compatibility in target applications.

Frequently Asked Questions (FAQ)

Q: Can 60R040XPR directly replace PFRA.040 without circuit modification?

A: Yes. 60R040XPR is a direct electrical equivalent with matching 60V rating, 400 mA hold current, 800 mA trip current, and 3.8 s trip time. The 30 mOhm difference in initial resistance (550 mOhms vs. 520 mOhms) is within acceptable tolerance for overcurrent protection circuits.

Q: What is the difference between 60R040XPR and 60R040XU?

A: Both parts are electrically identical. The difference is packaging format: 60R040XPR is supplied in Cut Tape (CT) format for automated assembly, while 60R040XU is supplied in Bulk format. Select based on procurement and assembly process requirements.

Q: Can I use 60R030XPR as a substitute for PFRA.040?

A: 60R030XPR operates at 300 mA hold current versus PFRA.040's 400 mA. Substitution is possible only if circuit design verification confirms that normal operating current remains below 300 mA. Using a lower-rated fuse in a circuit designed for 400 mA operation will cause nuisance trips.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. PFRA.040 and all listed substitute parts (60R010XPR through 60R040XU, and MF-R040) are ROHS3 compliant and carry cURus and/or TUV certifications.

Q: What is the significance of the Ri (Initial Resistance) and R1 (Post Trip Resistance) parameters?

A: Ri represents the cold resistance of the fuse element before activation. R1 represents the maximum resistance after the fuse has tripped and the polymeric element has expanded. These parameters affect circuit voltage drop during normal operation and after fault conditions. Variations within specified tolerances do not impact functional interchangeability.

Q: Can MF-R040 from Bourns replace PFRA.040 from SCHURTER?

A: Yes. MF-R040 is a parametric equivalent with identical electrical specifications: 60V rating, 400 mA hold current, 800 mA trip current, 520 mOhms initial resistance, and 3.8 s trip time. Both parts are ROHS3 compliant and carry equivalent certifications.