PFRA.250 Polymeric PTC Resettable Fuse 30V 2.5A Radial

Part Overview

The PFRA.250 is a polymeric PTC resettable fuse manufactured by SCHURTER Inc., rated for 30V maximum voltage with a 2.5A hold current. This component is designed for overcurrent protection in electronic circuits and is currently in active product status with 1251 pieces in stock. Equivalent and substitute parts are identified based on matching electrical characteristics, mechanical compatibility, and regulatory compliance to support component procurement flexibility and supply chain continuity.

Key Parameters

Parameter	Value
Voltage - Max	30V
Current - Hold (Ih) (Max)	2.5 A
Current - Trip (It)	5 A
Current - Max	40 A
Time to Trip	10.3 s
Resistance - Initial (Ri) (Min)	25 mOhms
Resistance - Post Trip (R1) (Max)	70 mOhms
Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	Radial, Disc
Lead Spacing	0.201" (5.10mm)
Approval Agency	cURus, TUV
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the PFRA.250 are grouped into two categories based on electrical and mechanical compatibility:

Direct Parametric Equivalent: Parts matching all critical electrical parameters (30V maximum voltage, 2.5A hold current, 5A trip current, 10.3s time to trip, 25mOhms initial resistance, 70mOhms post-trip resistance) with identical through-hole radial mounting and 0.201" lead spacing.

Higher Current Rating Substitutes: Parts with identical voltage rating (30V) and through-hole radial mounting but with higher hold current ratings (3A through 9A). These parts are suitable only when circuit design permits higher current thresholds and can accommodate dimensional variations in length and height.

Critical Substitution Parameters:

Voltage - Max: 30V (non-negotiable)
Mounting Type: Through Hole Radial (mechanical compatibility)
Lead Spacing: 0.201" (5.10mm) for direct equivalents; 0.402" (10.20mm) for higher current variants
Operating Temperature: -40°C ~ 85°C (minimum requirement)
Approval Agency: cURus and/or TUV certification

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	Lead Spacing	Approval Agency
PFRA.250	SCHURTER Inc.	30V	2.5 A	5 A	10.3 s	25 mOhms	70 mOhms	-40°C ~ 85°C	0.201" (5.10mm)	cURus, TUV
MF-R250	Bourns Inc.	30V	2.5 A	5 A	10.3 s	25 mOhms	70 mOhms	-40°C ~ 85°C	0.201" (5.10mm)	cURus, TUV
0ZRB0300FF1A	Bel Fuse Inc.	30V	3 A	6 A	10.8 s	20 mOhms	80 mOhms	-40°C ~ 85°C	0.201" (5.10mm)	cURus, TUV
0ZRB0300FF2B	Bel Fuse Inc.	30V	3 A	6 A	10.8 s	20 mOhms	80 mOhms	-40°C ~ 85°C	0.201" (5.10mm)	cURus, TUV
0ZRB0400FF1A	Bel Fuse Inc.	30V	4 A	8 A	12.7 s	10 mOhms	50 mOhms	-40°C ~ 85°C	0.201" (5.10mm)	cURus, TUV
0ZRB0400FF2B	Bel Fuse Inc.	30V	4 A	8 A	12.7 s	10 mOhms	50 mOhms	-40°C ~ 85°C	0.201" (5.10mm)	cURus, TUV
0ZRB0500FF1A	Bel Fuse Inc.	30V	5 A	10 A	14.5 s	10 mOhms	50 mOhms	-40°C ~ 85°C	0.402" (10.20mm)	cURus, TUV
0ZRB0600FF1A	Bel Fuse Inc.	30V	6 A	12 A	16 s	5 mOhms	40 mOhms	-40°C ~ 85°C	0.402" (10.20mm)	cURus, TUV
0ZRB0700FF1A	Bel Fuse Inc.	30V	7 A	14 A	17.5 s	5 mOhms	30 mOhms	-40°C ~ 85°C	0.402" (10.20mm)	cURus, TUV
0ZRB0800FF1A	Bel Fuse Inc.	30V	8 A	16 A	18.8 s	5 mOhms	20 mOhms	-40°C ~ 85°C	0.402" (10.20mm)	cURus, TUV
0ZRB0900FF1A	Bel Fuse Inc.	30V	9 A	18 A	20 s	5 mOhms	20 mOhms	-40°C ~ 85°C	0.402" (10.20mm)	cURus, TUV

Engineering Selection Recommendations

Direct Equivalent (Preferred for Pin-for-Pin Replacement): The MF-R250 from Bourns Inc. is a parametric equivalent to the PFRA.250, matching all electrical specifications and mechanical dimensions. Both components carry cURus and TUV approvals and are ROHS3 compliant. This part is suitable for direct substitution without circuit redesign.

Higher Current Rating Alternatives (Circuit Design Dependent): The 0ZRB series from Bel Fuse Inc. (0ZRB0300FF1A, 0ZRB0300FF2B, 0ZRB0400FF1A, 0ZRB0400FF2B) maintain the 0.201" lead spacing and are compatible with the same PCB footprint as the PFRA.250. These parts carry AEC-Q200 ratings in addition to cURus and TUV approvals. Selection of these higher-rated alternatives requires verification that the circuit design permits the increased hold and trip current thresholds.

Extended Current Range (Mechanical Redesign Required): The 0ZRB0500FF1A, 0ZRB0600FF1A, 0ZRB0700FF1A, 0ZRB0800FF1A, and 0ZRB0900FF1A feature 0.402" lead spacing, requiring PCB layout modification. These parts are suitable only when circuit requirements demand higher current protection thresholds and mechanical redesign is feasible.

All substitute parts maintain the 30V voltage rating, through-hole radial mounting, -40°C to 85°C operating temperature range, and required regulatory certifications.

Frequently Asked Questions (FAQ)

Q: Can the MF-R250 replace the PFRA.250 without any circuit modifications? A: Yes. The MF-R250 is a direct parametric equivalent with identical electrical specifications, mechanical dimensions, and lead spacing. No circuit or PCB modifications are required.

Q: What is the difference between the 0ZRB0300FF1A and 0ZRB0300FF2B? A: Both parts are electrically identical with 3A hold current and 6A trip current. The primary difference is packaging: 0ZRB0300FF1A is supplied in Box packaging, while 0ZRB0300FF2B is supplied in Cut Tape (CT) packaging. Electrical performance and PCB compatibility are identical.

Q: Can I use a 0ZRB0500FF1A in place of the PFRA.250? A: The 0ZRB0500FF1A has a different lead spacing (0.402" versus 0.201"), requiring PCB redesign. Additionally, the 5A hold current is double that of the PFRA.250, which may cause the fuse to trip at higher current levels than the original circuit design intended. Use only if circuit requirements permit higher current thresholds and PCB layout can be modified.

Q: Are all substitute parts RoHS compliant? A: Yes. The PFRA.250 and all listed substitute parts are ROHS3 compliant. All parts are also REACH unaffected.

Q: What certifications do the substitute parts carry? A: The MF-R250 carries cURus and TUV approvals, matching the PFRA.250. The Bel Fuse 0ZRB series carries cURus and TUV approvals, with additional AEC-Q200 automotive qualification for most variants.

Q: How do I determine which substitute part is appropriate for my application? A: Verify that the substitute part's hold current (Ih) and trip current (It) match or exceed your circuit's protection requirements. Confirm that the lead spacing is compatible with your PCB footprint. Ensure the operating temperature range (-40°C to 85°C) covers your application environment.

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