MF-R250-AP-10-99

Resistance - Initial (Ri) (Min):	25 mOhms
Approvals:	cURus, TUV
Lead Spacing:	0.201" (5.10mm)
Thickness (Max):	--
Height - Seated (Max):	0.720" (18.30mm)
Size / Dimension:	0.472" L x 0.118" W (12.00mm x 3.00mm)
Package / Case:	Radial, Disc
Mounting Type:	Through Hole
Ratings:	--
Operating Temperature:	-40°C ~ 85°C
Resistance - Post Trip (R1) (Max):	70 mOhms
Series:	Multifuse®, MF-R
Time to Trip:	10.3s
Current - Trip (It):	5A
Current - Hold (Ih) (Max):	2.5A
Current - Max:	40A
Voltage - Max:	30V
Type:	Polymeric
Moisture Sensitivity Level (MSL):	--
Part Status:	Not For New Designs
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Box (TB)

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PTC Resettable Fuses: MF-R250-AP-10-99 application field and working principle

PTC resettable fuses are a type of fuse that can reset themselves after a current overload. These fuses are widely used in many applications, such as electronic circuits, circuit boards, power supplies, motors, and circuit breakers.The MF-R250-AP-10-99 is a type of PTC resettable fuse from the MF-R250-AP series. It is designed to protect sensitive electronic components from power surges or overloads.The MF-R250-AP-10-99’s working principle is based on a ceramic disk embedded with two electrically conductive materials, a primary and a secondary material. When current flows through the disk, the electrical field is generated by the primary material, which causes a decrease in the electrical resistance of the secondary material. As long as the current stays at a safe level, the electrical resistance remains low.However, when the current exceeds the rated level, the electrical resistance increases sharply. This will cause the temperature of the disk to rise, which will then cause the disk to break and the fuse to open. This stops the high current from continuing to flow and protects the components.Once the fault has been corrected, the fuse can be reset by pressing the reset button. This will restore the electrical resistance of the secondary material to the low level, allowing current to flow through the disk again.The MF-R250-AP-10-99 is suitable for a wide range of applications, such as consumer electronics, office equipment, and industrial and medical equipment. It is available in several current and voltage capacities, from 2A to 25A in 125V and 250V versions. The MF-R250-AP-10-99 is encapsulated in epoxy to ensure reliability and protect it from environmental stresses.The MF-R250-AP-10-99 offers several advantages over other types of fuses, such as traditional glass-fuse types. These benefits include a much faster response time to current overloads, better protection for sensitive components, and no need for replacement after a current overload. Additionally, PTC resettable fuses are compact, making them a suitable choice for applications with limited space.In conclusion, the MF-R250-AP-10-99 offers reliable protection for sensitive electronic components. It provides a fast response to current overloads and can be reset after a fault, eliminating the need for replacement. The MF-R250-AP-10-99 is available in multiple current and voltage capacities, making it suitable for a wide range of applications.

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