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MF-RM040/240-2
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Product Detailed Parameters
- Description：PTC RESET FUSE 240V 400MA 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)：400 mA
- Current - Trip (It)：900 mA
- Current - Max：5.5 A
- Time to Trip：24 s
- Resistance - Initial (Ri) (Min)：600 mOhms
- Resistance - Post Trip (R1) (Max)：1.9 Ohms
- Operating Temperature：-20°C ~ 85°C
- Grade：-
- Qualification：-
- Ratings：-
- Mounting Type：Through Hole
- Package / Case：Radial, Disc
- Size / Dimension：0.453" L x 0.150" W (11.50mm x 3.80mm)
- Height - Seated (Max)：0.823" (20.90mm)
- Thickness (Max)：-
- Lead Spacing：0.114" (2.90mm)
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Overview
The Bourns MF-RM040/240-2 is a radial leaded self-resetting polymeric positive temperature coefficient (PPTC) device designed for overcurrent protection in AC circuits. It features a rated voltage of 240V AC and a holding current of 0.40A. The component trips at 900mA within 24 seconds and withstands maximum fault currents up to 5.5A. Its resistance ranges from 0.6Ω to 1.9Ω, with a power dissipation capacity of 2W. Operating temperatures span from -20°C to +85°C, and physical dimensions are 11.5mm length, 3.8mm width, and 20.9mm height.
Feature Summary
- Provides automatic circuit recovery after fault conditions clear without manual intervention
- Offers high breaking capacity for reliable interruption of excessive fault currents
- Constructs a compact radial leaded form factor suitable for space-constrained PCB layouts
Applications
- AC mains input filtering stages
- Consumer electronics power supplies
- Industrial control circuitry
Procurement Notes
Verify the specific suffix designation against official manufacturer documentation to confirm exact trip characteristics and lead configuration. Ensure the procurement channel provides traceable certificates of conformity. Confirm that the delivered components match the specified 240V AC rating and 0.40A holding current parameters required for your circuit design.
Selection Notes
Select this component when designing AC-powered systems requiring resettable overcurrent protection. Evaluate the 240V AC rating against peak line voltages and ensure the 0.40A holding current aligns with normal operating loads. Consider the 2W power dissipation capability and thermal environment to prevent nuisance tripping during continuous operation.
Part Context
This part belongs to Bourns' MF-RM series of self-resetting fuses. These devices utilize polymeric technology to provide cost-effective protection compared to traditional fusible links. The series is engineered for applications where system uptime is critical, allowing automatic restoration of function after temporary overload events.
Replacement Considerations
Cross-reference replacement parts using identical voltage ratings, holding currents, and trip times. Verify that substitute components maintain compatible physical dimensions and lead spacing for existing board footprints.
