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MF-RM025/240-0
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Product Detailed Parameters
- Description：PTC RESET FUSE 240V 250MA RADIAL
- Series：Multifuse®, MF-RM
- Mfr：Bourns Inc.
- Package：Bulk
- Type：Polymeric
- Voltage - Max：240V (265V Int)
- Current - Hold (Ih) (Max)：250 mA
- Current - Trip (It)：560 mA
- Current - Max：3.5 A
- Time to Trip：18.5 s
- Resistance - Initial (Ri) (Min)：1.3 Ohms
- Resistance - Post Trip (R1) (Max)：3.8 Ohms
- Operating Temperature：-20°C ~ 85°C
- Grade：-
- Qualification：-
- Ratings：-
- Mounting Type：Through Hole
- Package / Case：Radial, Disc
- Size / Dimension：0.394" L x 0.150" W (10.00mm 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-RM025/240-0 is a radial leaded, self-resetting polymeric positive temperature coefficient (PPTC) device from the Multifuse RM series. Designed for circuit protection, it features a hold current of 250 mA and a trip current of 750 mA. The component supports a maximum voltage of 240 VAC and has a maximum rated current of 1.2 A. It exhibits a typical resistance of 12 ohms and operates within a temperature range of -20°C to +85°C. The unit utilizes a bulk packaging format with a 5.1 mm lead spacing.
Feature Summary
- Provides automatic resettable overcurrent protection without manual replacement
- Utilizes polymeric technology for high-cycle reliability in circuit protection
- Features radial leads for through-hole printed circuit board mounting
Applications
- Overcurrent protection for AC power input lines
- Protection of consumer electronic devices against excessive current
- Industrial control circuit safeguarding
- Telecommunications equipment line protection
Procurement Notes
Verify that the specific ordering suffix matches the required voltage and current ratings for the target application. Confirm compliance with RoHS directives if environmental regulations apply. Ensure the thermal environment remains within the specified operating temperature limits to maintain device performance. Cross-reference the datasheet for precise mechanical dimensions to validate PCB layout compatibility before finalizing procurement orders.
Selection Notes
Select this component when a resettable fuse is required for AC circuits up to 240 VAC. The 250 mA hold current suits moderate load protection needs. Consider the 12 ohm initial resistance for potential voltage drop impacts in low-voltage sensitive circuits. Evaluate the physical size and lead spacing constraints against the available PCB real estate during the design phase.
Part Context
This part belongs to the Bourns Multifuse RM series of PPTC resettable fuses. The series offers various hold currents and voltage ratings to accommodate different circuit requirements. These components are designed to replace traditional one-time fuses in applications where system uptime and ease of maintenance are critical priorities.
Replacement Considerations
Direct substitutes must match the 250 mA hold current, 240 VAC rating, and radial package style. Verify that alternative PPTC devices have comparable trip characteristics and thermal performance to ensure equivalent circuit protection levels.
