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MF-RX300/72-0-14
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Product Detailed Parameters
- Description：FUSE PTC RESETTABLE
- Series：MF-RX/72
- Mfr：Bourns Inc.
- Package：Bulk,Bulk
- Type：-
- Voltage - Max：72V
- Current - Hold (Ih) (Max)：3:00 AM
- Current - Trip (It)：6:00 AM
- Current - Max：40 A
- Time to Trip：19.8 s
- Resistance - Initial (Ri) (Min)：-
- Resistance - Post Trip (R1) (Max)：-
- Operating Temperature：-
- Grade：-
- Qualification：-
- Ratings：-
- Mounting Type：Through Hole
- Package / Case：Radial, Disc
- Size / Dimension：0.980" L x 0.122" W (24.90mm x 3.10mm)
- Height - Seated (Max)：1.181" (30.00mm)
- Thickness (Max)：-
- Lead Spacing：0.402" (10.20mm)
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Overview
The Bourns MF-RX300/72-0-14 is a radial leaded polymeric positive temperature coefficient (PPTC) resettable fuse from the Multifuse MF-RX/72 series. It features a hold current of 3.0 A and a trip current of 6.0 A, with a maximum voltage rating of 72 VDC. The device offers a high fault current rating of 40 A maximum and exhibits a typical resistance of 60 mOhms. Designed for PCB mounting, it operates within a temperature range of -40°C to +85°C. Key physical dimensions include a length of 26.7 mm, height of 3.1 mm, and a lead spacing of 10.2 mm.
Feature Summary
- Provides automatic circuit protection by increasing resistance in response to overcurrent or overheating conditions
- Functions as a resettable device that returns to low resistance state after fault clearance and cooling
- Utilizes polymer technology for reliable performance in harsh thermal environments
Applications
- LED driver applications
- Current control circuits
- Overheating protection systems
- Surge and electrostatic discharge protection
Procurement Notes
Verify the specific suffix '-14' against the manufacturer's official datasheet to confirm lead configuration and packaging details. Ensure the selected component matches the required hold and trip currents for the target circuit design. Cross-reference the RoHS compliance status with the latest regulatory documentation prior to integration.
Selection Notes
Select this component when a 3.0 A hold current and 72 VDC rating are required for radial PCB mounting. Consider the 10.2 mm lead spacing for board layout compatibility. Evaluate the 60 mOhms resistance and 40 A max fault current capabilities against the system's peak load and short-circuit requirements to ensure adequate protection margins.
Part Context
This part belongs to the Bourns Multifuse MF-RX/72 series of PTC resettable fuses. The series is characterized by radial leaded construction suitable for through-hole PCB assembly. It serves as a reusable alternative to traditional one-time fuses, offering protection against overcurrent and excessive heat in electronic circuits.
Replacement Considerations
Consult the official Bourns replacement guide for obsolete parts. Verify electrical parameters such as hold current, voltage rating, and physical dimensions before substituting with other MF-RX series variants or competitor products.
