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MF-RM055/240-2
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Product Detailed Parameters
- Description：PTC RESET FUSE 240V 550MA RADIAL
- Series：Multifuse®, MF-RM
- Mfr：Bourns Inc.
- Package：Tape & Reel (TR),Cut Tape (CT)
- Type：Polymeric
- Voltage - Max：240V (265V Int)
- Current - Hold (Ih) (Max)：550 mA
- Current - Trip (It)：1.25 A
- Current - Max：7:00 AM
- Time to Trip：26 s
- Resistance - Initial (Ri) (Min)：450 mOhms
- Resistance - Post Trip (R1) (Max)：1.45 Ohms
- Operating Temperature：-20°C ~ 85°C
- Grade：-
- Qualification：-
- Ratings：-
- Mounting Type：Through Hole
- Package / Case：Radial, Disc
- Size / Dimension：0.551" L x 0.161" W (14.00mm x 4.10mm)
- Height - Seated (Max)：0.882" (22.40mm)
- Thickness (Max)：-
- Lead Spacing：0.114" (2.90mm)
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Overview
The Bourns MF-RM055/240-2 is a radial lead PPTC resettable fuse from the MF-RM series, rated for 240V AC. It features a 55mA hold current and a 130mA trip current with a 10-second trip time. The device has a maximum resistance of 65Ω and operates within a temperature range of -20°C to +85°C. It supports a maximum current of 5.5A and dissipates up to 0.9W. Physical dimensions include an 8.3mm length and 12.9mm height.
Feature Summary
- Provides automatic circuit protection through self-resetting polymer positive temperature coefficient technology
- Designed for through-hole PCB mounting with radial leads for standard assembly processes
- Complies with UL safety standards and RoHS directives for regulatory adherence
Applications
- Overcurrent protection in consumer electronics circuits
- Protection for portable computing devices and peripherals
- Industrial instrumentation and measurement equipment safeguarding
Procurement Notes
Verify component authenticity by cross-referencing the manufacturer part number against official Bourns documentation. Ensure the specific suffix matches the required voltage and current ratings. Confirm compliance certifications such as UL and RoHS are present on the datasheet before integration into final designs.
Selection Notes
Select this component based on the specific 55mA hold current requirement for low-power circuit protection. Consider the 240V AC rating for mains-connected applications. Evaluate the physical footprint constraints against the specified dimensions. Ensure the operating temperature range aligns with the environmental conditions of the target application.
Part Context
This part belongs to the MF-RM series of resettable fuses, which are designed for general-purpose overcurrent protection. The series offers various hold current options within a standardized package form factor. These components serve as alternatives to traditional fusible links by providing reusable protection capabilities.
Replacement Considerations
Direct substitutes must match the 55mA hold current, 240V AC rating, and radial package. Verify that any replacement maintains identical trip characteristics and physical dimensions to ensure board compatibility without redesign.
