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MF-RX300-2-99
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Product Detailed Parameters
- Description：PTC RESET FUSE 60V 3A RADIAL
- Series：Multifuse®, MF-RX
- Mfr：Bourns Inc.
- Package：Tape & Reel (TR)
- Type：Polymeric
- Voltage - Max：60V
- 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)：40 mOhms
- Resistance - Post Trip (R1) (Max)：100 mOhms
- Operating Temperature：-40°C ~ 85°C
- 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 MF-RX300-2-99 is a polymeric PTC resettable fuse manufactured by Bourns Inc. It features a radial lead through-hole package designed for circuit protection applications. The component has a maximum voltage rating of 60V and a hold current of 3A. It trips at 6A and supports a maximum fault current of 40A. The device measures 1.181 inches (30.00mm) in seated height with a lead spacing of 0.402 inches (10.20mm). This part is currently listed as obsolete.
Feature Summary
- Polymeric positive temperature coefficient construction for automatic reset functionality
- Radial leaded package design for through-hole mounting
- High fault current capability up to 40A
Applications
- Overcurrent protection in electronic circuits
- Circuit protection for professional audio equipment
- Power supply input protection
Procurement Notes
Verify the obsolete status of this specific Bourns part number before integration into new designs. Confirm that existing inventory or surplus sources provide genuine components matching the original datasheet specifications. Ensure compatibility with the required 60V rating and 3A hold current parameters for the target application.
Selection Notes
Select this component only if the system voltage does not exceed 60V and the operating current remains below 3A. Consider the physical dimensions, specifically the 30.00mm height and 10.20mm lead spacing, for board layout constraints. Evaluate alternative active parts if long-term availability is critical for production.
Part Context
This device belongs to the PTC resettable fuse category from Bourns Inc., which provides reusable overcurrent protection solutions. These components function similarly to traditional fuses but restore conductivity after cooling following a trip event. The radial lead format distinguishes it from surface mount alternatives within the broader circuit protection portfolio.
Replacement Considerations
As the MF-RX300-2-99 is marked obsolete, verify equivalent active parts from the manufacturer or other suppliers. Cross-reference technical parameters such as voltage, hold current, and trip current to ensure functional compatibility during substitution.
