PFRA.800 Polymeric PTC Resettable Fuse 30V 8A Radial

Part Overview

The PFRA.800 is a polymeric PTC resettable fuse manufactured by SCHURTER Inc., designed for through-hole radial mounting in 30V circuits with 8A hold current specifications. This component is active in production and widely used in circuit protection applications requiring automatic reset capability after fault conditions clear.

Equivalent and substitute parts are necessary when the primary PFRA.800 is unavailable due to supply constraints, inventory limitations, or packaging requirements. Alternative models meeting identical electrical and mechanical parameters provide direct functional replacement without circuit redesign.

Key Parameters

Parameter	Value
Voltage - Max	30V
Current - Hold (Ih) (Max)	8 A
Current - Trip (It)	16 A
Current - Max	40 A
Time to Trip	18.8 s
Resistance - Initial (Ri) (Min)	5 mOhms
Resistance - Post Trip (R1) (Max)	30 mOhms
Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	Radial, Disc
Lead Spacing	0.402" (10.20mm)
Approval Agency	cURus, TUV
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the PFRA.800 is determined by strict equivalence across the following critical parameters:

Voltage rating: 30V maximum
Hold current (Ih): 8A
Trip current (It): 16A
Maximum current: 40A
Time to trip: 18.8 seconds
Initial resistance: 5 mOhms minimum
Post-trip resistance: 30 mOhms maximum
Operating temperature range: -40°C to 85°C
Mounting configuration: Through hole radial disc
Lead spacing: 0.402" (10.20mm)
Regulatory compliance: cURus and TUV approval

Only parts meeting all these parameters qualify as direct substitutes. Parts with different current ratings, resistance values, or lead spacing are not equivalent and require circuit validation before use.

Parameter Comparison

Parameter	PFRA.800 (SCHURTER)	0ZRB0800FF1A (Bel Fuse)	MF-R800 (Bourns)
Manufacturer	SCHURTER Inc.	Bel Fuse Inc.	Bourns Inc.
Voltage - Max	30V	30V	30V
Current - Hold (Ih) (Max)	8 A	8 A	8 A
Current - Trip (It)	16 A	16 A	16 A
Current - Max	40 A	40 A	40 A
Time to Trip	18.8 s	18.8 s	18.8 s
Resistance - Initial (Ri) (Min)	5 mOhms	5 mOhms	5 mOhms
Resistance - Post Trip (R1) (Max)	30 mOhms	20 mOhms	30 mOhms
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Disc	Radial, Disc	Radial, Disc
Lead Spacing	0.402" (10.20mm)	0.402" (10.20mm)	0.402" (10.20mm)
Approval Agency	cURus, TUV	cURus, TUV	cURus, TUV
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active

Engineering Selection Recommendations

The 0ZRB0800FF1A from Bel Fuse Inc. and MF-R800 from Bourns Inc. are parametric equivalents to the PFRA.800. Both substitute parts maintain identical electrical specifications across voltage, current hold, trip current, and time-to-trip parameters. All three parts carry cURus and TUV approvals and comply with ROHS3 requirements.

The 0ZRB0800FF1A is available in Box packaging with 2,157 units in stock. The MF-R800 is available in Bulk packaging with 3,785 units in stock. Selection between these substitutes depends on packaging requirements and inventory availability rather than electrical performance, as all three parts are functionally interchangeable in the specified circuit application.

Frequently Asked Questions (FAQ)

Q: Can the 0ZRB0800FF1A replace the PFRA.800 directly?

A: Yes. The 0ZRB0800FF1A meets all electrical and mechanical parameters of the PFRA.800, including 30V voltage rating, 8A hold current, 16A trip current, 18.8 second trip time, and 0.402" lead spacing. Both parts carry identical regulatory approvals and RoHS compliance status.

Q: What is the difference between the 0ZRB0800FF1A and MF-R800?

A: Both are parametric equivalents to the PFRA.800 with identical electrical specifications. The primary differences are manufacturer (Bel Fuse vs. Bourns), packaging format (Box vs. Bulk), and post-trip resistance maximum (20 mOhms vs. 30 mOhms). The lower post-trip resistance of the 0ZRB0800FF1A represents improved performance within acceptable limits.

Q: Are lower current-rated alternatives such as 0ZRB0700FF1A suitable substitutes?

A: No. The 0ZRB0700FF1A has a 7A hold current and 14A trip current, which differ from the PFRA.800 specifications. Using a lower-rated fuse in a circuit designed for 8A protection will cause nuisance trips and is not a valid substitution.

Q: What packaging options are available for the PFRA.800 equivalent?

A: The 0ZRB0800FF1A is supplied in Box packaging. The MF-R800 is supplied in Bulk packaging. Both meet the same electrical requirements; packaging selection depends on assembly process and inventory management requirements.

Q: Do all three parts have the same lead spacing?

A: Yes. The PFRA.800, 0ZRB0800FF1A, and MF-R800 all have 0.402" (10.20mm) lead spacing, ensuring direct PCB compatibility without layout modifications.

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