PFRA.300.2 Polymeric PTC Resettable Fuse 30V 3A Radial Equivalent & Substitute Parts

Part Overview

The PFRA.300.2 is a polymeric PTC resettable fuse manufactured by SCHURTER Inc., rated for 30V maximum voltage and 3A hold current (Ih). This component is designed for through-hole radial mounting in disc configuration and is currently in active product status. The PFRA.300.2 provides automatic overcurrent protection with automatic recovery capability after fault condition removal. Equivalent and substitute parts are identified to support procurement flexibility, inventory optimization, and supply chain continuity for applications requiring 30V 3A polymeric PTC resettable fuses with compatible electrical and mechanical specifications.

Key Parameters

Parameter	Value
Voltage - Max	30V
Current - Hold (Ih) (Max)	3A
Current - Trip (It)	6A
Time to Trip	10.8s
Resistance - Initial (Ri) (Min)	20 mOhms
Resistance - Post Trip (R1) (Max)	80 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 PFRA.300.2 are classified into two categories based on electrical parameter compatibility:

Direct Substitutes maintain identical electrical specifications: 30V maximum voltage, 3A hold current (Ih), 6A trip current (It), 10.8s time to trip, 20 mOhms minimum initial resistance, and 80 mOhms maximum post-trip resistance. These parts are functionally interchangeable in applications where the PFRA.300.2 is specified. Direct substitutes include RUEF300-2 and RUEF300K-2 from Littelfuse Inc., both rated for higher maximum current (100A vs. 40A) but maintaining identical hold and trip characteristics.

Similar Substitutes share the same voltage rating (30V), hold current (3A), trip current (6A), and time to trip (10.8s) but originate from different manufacturers (Bel Fuse Inc.). These parts include 0ZRB0300FF1A and 0ZRB0300FF2B. Mechanical dimensions and lead spacing remain compatible with through-hole radial mounting applications.

Parts with different hold current ratings (0ZRB0400FF1A, 0ZRB0400FF2B, 0ZRB0500FF1A, 0ZRB0600FF1A, 0ZRB0700FF1A, 0ZRB0800FF1A) are not direct substitutes due to differing electrical characteristics and are listed for reference only.

Parameter Comparison

Part Number	Manufacturer	Voltage - Max	Current - Hold (Ih)	Current - Trip (It)	Time to Trip	Ri (Min)	R1 (Max)	Operating Temp	Packaging	Approval Agency
PFRA.300.2	SCHURTER Inc.	30V	3A	6A	10.8s	20 mOhms	80 mOhms	-40°C ~ 85°C	Cut Tape (CT)	cURus, TUV
RUEF300-2	Littelfuse	30V	3A	6A	10.8s	20 mOhms	80 mOhms	-40°C ~ 85°C	Cut Tape (CT)	CQC, CSA, TUV, UL
RUEF300K-2	Littelfuse Inc.	30V	3A	6A	10.8s	20 mOhms	80 mOhms	-40°C ~ 85°C	Cut Tape (CT)	CQC, CSA, TUV, UL
0ZRB0300FF1A	Bel Fuse Inc.	30V	3A	6A	10.8s	20 mOhms	80 mOhms	-40°C ~ 85°C	Box	cURus, TUV
0ZRB0300FF2B	Bel Fuse Inc.	30V	3A	6A	10.8s	20 mOhms	80 mOhms	-40°C ~ 85°C	Cut Tape (CT)	cURus, TUV

Engineering Selection Recommendations

All identified substitute parts maintain active product status and ROHS3 compliance. Selection between direct substitutes (RUEF300-2, RUEF300K-2) and similar substitutes (0ZRB0300FF1A, 0ZRB0300FF2B) depends on certification requirements and packaging format.

RUEF300-2 and RUEF300K-2 from Littelfuse provide expanded approval agency coverage (CQC, CSA, TUV, UL) compared to the PFRA.300.2 (cURus, TUV), offering broader compliance support for regulated applications. Both Littelfuse parts are available in cut tape packaging and maintain identical electrical specifications.

0ZRB0300FF1A and 0ZRB0300FF2B from Bel Fuse Inc. provide AEC-Q200 automotive qualification ratings not present in the PFRA.300.2 specification. 0ZRB0300FF2B is available in cut tape packaging, matching the PFRA.300.2 format, while 0ZRB0300FF1A is supplied in box packaging. Both maintain cURus and TUV approvals consistent with the main part.

Packaging format (cut tape vs. box) should be verified against assembly process requirements and inventory management systems.

Frequently Asked Questions (FAQ)

Q: Can RUEF300-2 or RUEF300K-2 be used as direct replacements for PFRA.300.2?

A: Yes. Both Littelfuse parts maintain identical electrical specifications: 30V maximum voltage, 3A hold current, 6A trip current, 10.8s time to trip, and matching resistance values. All three parts are polymeric PTC resettable fuses with through-hole radial mounting. Littelfuse parts provide additional approval agency certifications (CSA, UL) beyond the PFRA.300.2.

Q: What is the difference between 0ZRB0300FF1A and 0ZRB0300FF2B?

A: Both parts are electrically identical 30V 3A polymeric PTC resettable fuses from Bel Fuse Inc. with matching hold current, trip current, and resistance specifications. The primary difference is packaging format: 0ZRB0300FF1A is supplied in box packaging, while 0ZRB0300FF2B is supplied in cut tape packaging. 0ZRB0300FF2B matches the PFRA.300.2 cut tape format.

Q: Are parts with different hold current ratings (4A, 5A, 6A, 7A, 8A) suitable substitutes?

A: No. Parts with different hold current ratings (0ZRB0400FF1A, 0ZRB0500FF1A, 0ZRB0600FF1A, 0ZRB0700FF1A, 0ZRB0800FF1A) have different electrical characteristics and are not suitable substitutes for the PFRA.300.2 3A hold current specification. These parts are listed for reference only and should not be used in applications requiring 3A hold current protection.

Q: What certifications are required for my application?

A: Certification requirements depend on end-use application. PFRA.300.2 carries cURus and TUV approvals. RUEF300-2 and RUEF300K-2 provide expanded coverage with CQC, CSA, TUV, and UL certifications. Bel Fuse 0ZRB series parts include AEC-Q200 automotive qualification. Verify certification requirements against your application specifications before part selection.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All identified substitute parts (RUEF300-2, RUEF300K-2, 0ZRB0300FF1A, 0ZRB0300FF2B) are ROHS3 compliant, matching the PFRA.300.2 environmental compliance status.

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