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MF-RM033/240-0
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Product Detailed Parameters
- Description：PTC RESET FUSE 240V 330MA RADIAL
- Series：Multifuse®, MF-RM
- Mfr：Bourns Inc.
- Package：Bulk
- Type：Polymeric
- Voltage - Max：240V (265V Int)
- Current - Hold (Ih) (Max)：330 mA
- Current - Trip (It)：740 mA
- Current - Max：4.5 A
- Time to Trip：21 s
- Resistance - Initial (Ri) (Min)：770 mOhms
- Resistance - Post Trip (R1) (Max)：2.6 Ohms
- Operating Temperature：-20°C ~ 85°C
- Grade：-
- Qualification：-
- Ratings：-
- Mounting Type：Through Hole
- Package / Case：Radial, Disc
- Size / Dimension：0.449" L x 0.150" W (11.40mm x 3.80mm)
- Height - Seated (Max)：0.787" (20.00mm)
- Thickness (Max)：-
- Lead Spacing：0.114" (2.90mm)
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Overview
The Bourns MF-RM033/240-0 is a radial leaded polymeric positive temperature coefficient (PPTC) resettable fuse from the MF-RM series. It features a maximum operating voltage of 240 VAC and a hold current of 33 mA. The device trips at 100 mA and supports a maximum fault current of 3.3 A. Initial resistance is typically 12 ohms, with an operating temperature range of -20°C to +85°C.
Feature Summary
- Provides automatic circuit protection by increasing resistance in response to overcurrent or overheating conditions
- Restores normal operation after cooling down without requiring manual replacement
- Designed for PCB mounting with radial leads for through-hole integration
Applications
- Consumer electronics power supply circuits
- Industrial control system protection
- Telecommunications equipment overcurrent safeguarding
Procurement Notes
Verify component authenticity using official Bourns documentation and serial markings. Confirm RoHS compliance status and datasheet revisions prior to procurement. Ensure storage conditions maintain integrity of the polymer matrix. Cross-reference ordering suffixes to confirm package and tape specifications match design requirements.
Selection Notes
Select this component when circuit protection requires a 33 mA hold current and 240 VAC rating. Evaluate thermal derating curves for high ambient temperatures. Compare initial resistance values against signal integrity requirements. Ensure trip current margins accommodate startup surges without nuisance tripping during normal operation.
Part Context
This part belongs to the MF-RM series of resettable fuses designed for general-purpose circuit protection. The series offers various current ratings and voltage options to suit different application needs. These devices serve as alternatives to traditional fusible links by providing reusable protection capabilities in electronic assemblies.
Replacement Considerations
Public confirmed substitute part numbers are not available in verified documentation. Consult official Bourns cross-reference tools for compatible alternatives. Verify that any replacement matches voltage, current, and dimensional specifications.
