MF-R005-AP

Resistance - Initial (Ri) (Min):	7.3 Ohms
Approvals:	cURus, TUV
Lead Spacing:	0.201" (5.10mm)
Thickness (Max):	--
Height - Seated (Max):	0.327" (8.30mm)
Size / Dimension:	0.315" Dia x 0.122" W (8.00mm x 3.10mm)
Package / Case:	Radial, Disc
Mounting Type:	Through Hole
Ratings:	--
Operating Temperature:	-40°C ~ 85°C
Resistance - Post Trip (R1) (Max):	22 Ohms
Series:	Multifuse®, MF-R
Time to Trip:	5s
Current - Trip (It):	100mA
Current - Hold (Ih) (Max):	50mA
Current - Max:	40A
Voltage - Max:	60V
Type:	Polymeric
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Box (TB)

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Introduction

PTC (positive temperature coefficient) resettable fuses, or polyfuses, are a type of self-healing protection device for electrical circuits. These devices work on a principle of heat-triggered resistance. With the MF-R005-AP application field and working principle as an example, we will explain how these devices work and how they can be used in different applications.

What are PTC Resettable Fuses?

PTC resettable fuses are small, low-cost, solid-state electronic components used to protect electrical circuits from dangerous voltage and current spikes. When exposed to an overload, these devices respond by increasing their resistance in order to regulate the current flow, thus preventing further damage to the circuit. The MF-R005-AP is a specific type of PTC resettable fuse, and its working principle is similar to other devices in this class.

Application Field

The MF-R005-AP has a wide range of applications. It can be used as an overcurrent or overvoltage protection device, as well as for temperature control. Due to its small size, the device can be installed and placed in tight spaces, making it an ideal solution for space-constrained electronic circuits.

Working Principle

The working principle of the MF-R005-AP is based on a heat-responsive resistance. This means that the device increases its resistance when exposed to excessive heating. This heat can be caused by either a sudden increase in current or a rise in temperature. The device then acts as a fuse, limiting the excessive current and preventing further damage to the circuit.Once the current or temperature has returned to its normal range, the device will reset itself automatically, restoring the normal current flow. The device also self-regulates its internal temperature to avoid further damage from overheating.

Advantages of PTC Resettable Fuses

PTC resettable fuses have several advantages over traditional fuses. They are more reliable, as they are able to react quickly to current overloads and temperature rises. They are also cheaper than traditional fuses and more compact, making them ideal for applications where space is limited. Furthermore, they are able to reset themselves after an overload or a temperature rise, eliminating the need for monitoring or manual resetting.

Conclusion

The MF-R005-AP is a type of PTC resettable fuse which has a wide range of applications. Its working principle is based on a heat-responsive resistance, which increases the device’s resistance when exposed to an overload or temperature rise. Once the overload or temperature has returned to normal, the device is able to reset itself automatically. PTC resettable fuses are more reliable, cheaper, and more compact than traditional fuses, making them ideal for many applications.

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