MF-R500-0-99

Resistance - Initial (Ri) (Min):	10 mOhms
Approvals:	cURus, TUV
Lead Spacing:	0.402" (10.20mm)
Thickness (Max):	--
Height - Seated (Max):	0.980" (24.90mm)
Size / Dimension:	0.685" L x 0.118" W (17.40mm x 3.00mm)
Package / Case:	Radial, Disc
Mounting Type:	Through Hole
Ratings:	--
Operating Temperature:	-40°C ~ 85°C
Resistance - Post Trip (R1) (Max):	50 mOhms
Series:	Multifuse®, MF-R
Time to Trip:	14.5s
Current - Trip (It):	10A
Current - Hold (Ih) (Max):	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:	Bulk

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Introduction to PTC Resettable Fuses

PTC resettable fuses are becoming increasingly popular as a reliable method of circuit protection in many different applications. They work by monitoring the current passing through the circuit, and detecting if an overload or short circuit occurs. If the current is too high, the fuse will trip and open the circuit, preventing further damage. The PTC fuse can then be reset, allowing the circuit to continue to operate without interruption.The MF-R500-0-99 is one of the most popular types of PTC resettable fuses on the market. It has a standardized 0.5A capacity and is widely used in both commercial and consumer applications.

Application Field and Working Principle

The MF-R500-0-99 is typically used in applications that require protection from transient overcurrent conditions, such as overcharging of a battery, short circuit or electrical damage due to a surge of voltage. It is often used in devices that require a safety device to protect them from doing irreversible damage when exposed to irregular and/or frequent spikes in current. It is also sometimes used in high powered domestic and commercial appliances.The MF-R500-0-99 features a metal film (MELF) design with a very fast response time. This helps reduce the risk of further damage to the circuit or device in the event of an overload or short circuit. In addition, the MF-R500-0-99 has a self-resetting feature, meaning that once the fuse has tripped, it can be reset without the need for manual intervention.The working principle of the MF-R500-0-99 is fairly simple, it uses a positive temperature coefficient (PTC) element which is connected in series with the circuit. When the current flowing through the fuse is within a safe operating range, the PTC element will remain in its low-resistance state. However, if the current exceeds the threshold, the PTC element will heat up and increase in resistance, thus halting the flow of current and tripping the fuse.Once the overload or short circuit has been removed, the MF-R500-0-99 can be reset and the circuit will continue to operate without interruption. This makes it an ideal choice for circuits and equipment where manual intervention is difficult or impractical.

Conclusion

The MF-R500-0-99 is an extremely reliable and efficient resettable fuse. With its fast response time and self-resetting feature, it is ideally suited for applications that need to be protected from damaging currents such as overcharging a battery, or due to electrical surges and spikes in voltage. It is also widely used in consumer and commercial appliances, ensuring that maintenance and repair costs are kept to a minimum.

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