PFRA.400.2 Polymeric PTC Resettable Fuse 30V 4A Radial

Part Overview

The PFRA.400.2 is a polymeric PTC resettable fuse manufactured by SCHURTER Inc., designed for through-hole radial mounting in 30V, 4A applications. This component is classified as Active product status and is ROHS3 compliant. The device provides automatic overcurrent protection with a hold current (Ih) of 4A and trip current (It) of 8A, with a trip time of 12.7 seconds. Finding equivalent and substitute parts is necessary to ensure design flexibility, manage supply chain continuity, and accommodate different packaging or certification requirements across manufacturing environments.

Key Parameters

Parameter	Value
Manufacturer	SCHURTER Inc.
Part Number	PFRA.400.2
Series	PFRA
Type	Polymeric
Voltage - Max	30V
Current - Hold (Ih) (Max)	4A
Current - Trip (It)	8A
Current - Max	40A
Time to Trip	12.7s
Resistance - Initial (Ri) (Min)	10 mOhms
Resistance - Post Trip (R1) (Max)	50 mOhms
Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	Radial, Disc
Approval Agency	cURus, TUV
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the PFRA.400.2 are classified into two categories based on electrical parameter alignment:

Direct Substitutes maintain identical electrical specifications: Voltage - Max (30V), Current - Hold (Ih) (Max) (4A), Current - Trip (It) (8A), Time to Trip (12.7s), Resistance - Initial (Ri) (Min) (10 mOhms), and Resistance - Post Trip (R1) (Max) (50 mOhms). These parts are functionally interchangeable within the same circuit design. Direct substitutes include PTR030V0400-TR (Eaton), RUEF400-2 (Littelfuse), and RUEF400K-2 (Littelfuse).

Similar Parts share the same voltage rating (30V) and mounting type (Through Hole Radial, Disc) but differ in current-holding specifications. These parts are suitable for applications where the circuit design permits alternative current ratings. Similar parts include 0ZRB0300FF1A, 0ZRB0300FF2B (3A rating), 0ZRB0400FF1A, 0ZRB0400FF2B (4A rating), 0ZRB0500FF1A (5A rating), 0ZRB0600FF1A (6A rating), and 0ZRB0700FF1A (7A rating), all manufactured by Bel Fuse Inc.

Parameter Comparison

Part Number	Manufacturer	Voltage - Max	Current - Hold (Ih) (Max)	Current - Trip (It)	Time to Trip	Resistance - Initial (Ri) (Min)	Resistance - Post Trip (R1) (Max)	Operating Temperature	Mounting Type	Package / Case	Approval Agency	RoHS Status
PFRA.400.2	SCHURTER Inc.	30V	4A	8A	12.7s	10 mOhms	50 mOhms	-40°C ~ 85°C	Through Hole	Radial, Disc	cURus, TUV	ROHS3 Compliant
PTR030V0400-TR	Eaton - Electronics Division	30V	4A	8A	12.7s	10 mOhms	50 mOhms	-40°C ~ 85°C	Through Hole	Radial, Disc	cURus, TUV	ROHS3 Compliant
RUEF400-2	Littelfuse	30V	4A	8A	12.7s	10 mOhms	50 mOhms	-40°C ~ 85°C	Through Hole	Radial, Disc	CQC, CSA, TUV, UL	ROHS3 Compliant
RUEF400K-2	Littelfuse Inc.	30V	4A	8A	12.7s	10 mOhms	50 mOhms	-40°C ~ 85°C	Through Hole	Radial, Disc	CQC, CSA, TUV, UL	ROHS3 Compliant
0ZRB0300FF1A	Bel Fuse Inc.	30V	3A	6A	10.8s	20 mOhms	80 mOhms	-40°C ~ 85°C	Through Hole	Radial, Disc	cURus, TUV	ROHS3 Compliant
0ZRB0300FF2B	Bel Fuse Inc.	30V	3A	6A	10.8s	20 mOhms	80 mOhms	-40°C ~ 85°C	Through Hole	Radial, Disc	cURus, TUV	ROHS3 Compliant
0ZRB0400FF1A	Bel Fuse Inc.	30V	4A	8A	12.7s	10 mOhms	50 mOhms	-40°C ~ 85°C	Through Hole	Radial, Disc	cURus, TUV	ROHS3 Compliant
0ZRB0400FF2B	Bel Fuse Inc.	30V	4A	8A	12.7s	10 mOhms	50 mOhms	-40°C ~ 85°C	Through Hole	Radial, Disc	cURus, TUV	ROHS3 Compliant
0ZRB0500FF1A	Bel Fuse Inc.	30V	5A	10A	14.5s	10 mOhms	50 mOhms	-40°C ~ 85°C	Through Hole	Radial, Disc	cURus, TUV	ROHS3 Compliant
0ZRB0600FF1A	Bel Fuse Inc.	30V	6A	12A	16s	5 mOhms	40 mOhms	-40°C ~ 85°C	Through Hole	Radial, Disc	cURus, TUV	ROHS3 Compliant
0ZRB0700FF1A	Bel Fuse Inc.	30V	7A	14A	17.5s	5 mOhms	30 mOhms	-40°C ~ 85°C	Through Hole	Radial, Disc	cURus, TUV	ROHS3 Compliant

Engineering Selection Recommendations

Direct Substitutes (Functionally Equivalent):

PTR030V0400-TR (Eaton), RUEF400-2 (Littelfuse), and RUEF400K-2 (Littelfuse) are direct electrical equivalents to PFRA.400.2. All three maintain identical voltage, current-hold, current-trip, and resistance specifications. All direct substitutes carry Active product status and ROHS3 compliance. RUEF400-2 and RUEF400K-2 provide expanded approval agency coverage (CQC, CSA, TUV, UL) compared to the original part (cURus, TUV), which may be advantageous for applications requiring broader regulatory acceptance.

Similar Parts (Current Rating Variants):

0ZRB0400FF1A and 0ZRB0400FF2B (Bel Fuse Inc.) are electrically identical to PFRA.400.2 and differ only in packaging format (Box vs. Cut Tape). These parts are suitable for direct substitution when packaging requirements align. All Bel Fuse 0ZRB series parts carry AEC-Q200 automotive qualification ratings and cURus/TUV approvals, with ROHS3 compliance and Active product status.

Parts with different current ratings (0ZRB0300FF1A/2B at 3A, 0ZRB0500FF1A at 5A, 0ZRB0600FF1A at 6A, 0ZRB0700FF1A at 7A) are suitable only when circuit design permits alternative protection thresholds. Selection of these variants requires verification that the application's overcurrent protection requirements align with the different hold and trip current specifications.

Frequently Asked Questions (FAQ)

Q: Can PTR030V0400-TR replace PFRA.400.2 directly?

A: Yes. PTR030V0400-TR maintains identical electrical specifications: 30V maximum voltage, 4A hold current, 8A trip current, 12.7s trip time, and matching resistance values. Both parts are Active status and ROHS3 compliant. Physical dimensions differ slightly (PTR030V0400-TR: 14.00mm L vs. PFRA.400.2: 14.40mm L; height 20.10mm vs. 24.80mm), requiring verification of PCB layout compatibility.

Q: What is the difference between RUEF400-2 and RUEF400K-2?

A: Both are electrically identical to PFRA.400.2 with matching 30V, 4A, 8A specifications. The primary difference is seated height: RUEF400-2 is 19.30mm while RUEF400K-2 is 21.30mm. Both carry identical electrical ratings and approvals (CQC, CSA, TUV, UL). Selection depends on available PCB clearance.

Q: Can I use 0ZRB0400FF1A instead of PFRA.400.2?

A: Yes, for direct electrical substitution. 0ZRB0400FF1A maintains identical 30V, 4A, 8A specifications and resistance values. It differs in packaging (Box vs. Cut Tape) and includes AEC-Q200 automotive qualification. Physical dimensions are 14.00mm L x 20.10mm height, requiring PCB layout verification.

Q: Are the 3A and 5A Bel Fuse parts compatible with PFRA.400.2?

A: No, not for direct substitution. 0ZRB0300FF1A/2B (3A) and 0ZRB0500FF1A (5A) have different hold and trip current specifications. These parts are suitable only when the circuit design explicitly permits alternative protection thresholds. Using a lower-rated part (3A) may cause nuisance trips; using a higher-rated part (5A) may reduce protection effectiveness.

Q: What certifications does PFRA.400.2 carry?

A: PFRA.400.2 carries cURus and TUV approvals. RUEF400-2 and RUEF400K-2 provide expanded certifications (CQC, CSA, TUV, UL), which may be required for specific applications or markets.

Q: Does packaging format affect electrical performance?

A: No. Cut Tape (CT) and Box packaging formats contain identical electrical components. Packaging selection is based on supply chain requirements, handling procedures, and manufacturing automation compatibility, not electrical performance.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message