0ZCJ0025AF2E Circuit Protection

Series:	0ZCJ
Packaging:	Tape & Reel (TR)
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
Type:	Polymeric
Voltage - Max:	24V
Current - Max:	40A
Current - Hold (Ih) (Max):	250mA
Current - Trip (It):	500mA
Time to Trip:	80ms
Resistance - Initial (Ri) (Min):	550 mOhms
Resistance - Post Trip (R1) (Max):	2.3 Ohms
Operating Temperature:	-40°C ~ 85°C
Ratings:	--
Mounting Type:	Surface Mount
Package / Case:	1206 (3216 Metric), Concave
Size / Dimension:	0.128" L x 0.065" W (3.25mm x 1.65mm)
Height - Seated (Max):	--
Thickness (Max):	0.030" (0.75mm)
Lead Spacing:	--
Approvals:	cURus, TUV

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Introduction

PTC Resettable Fuses, typically also known as Polyfuse, are an electronic protection components used in many electrical systems. They feature a positive temperature coefficient (PTC) that alters under the effects of a high current. When the current exceeds the rated value for the first time, the fuse will trip, breaking the circuit, and begins to increase its resistance. The increased resistance causes a sudden decrease in current such that the overload is cleared, which allows the PTC fuse to reset and return to its normal operating state. Among the different types of resettable fuses, One example is the 0ZCJ0025AF2E, a chip-style surface mount PTC device. It typically features a maximum energy rating of 7 mJ, 240mA continuous current, a voltage rating of 5V DC, a resistance of 63m OHM at maximum trip point, and a maximum tripping current of 18 Amp.

Application Field

PTC Resettable Fuses of the 0zCJ0025AF2 type are commonly used in automotive applications, as their ability to reset after an overcurrent or excessive current helps to provide circuit protection. Other common applications include automatic battery chargers, electronic toys, and other high power devices. They are also used in battery systems with long-term power sources to provide overcurrent protection for devices.

Working Principle

The 0zCJ0025AF2 type of PTC Resettable Fuses typically feature a thermal element inside a glass sealed case. The thermal element is made of polyethylene film which changes its resistance when heated due to electrical current overload. This causes the temperature in the thermal element to increase until it reaches the trip point. Once the trip point is reached, the metal part inside the fuse melts, which creates an electrical connection between two points. This creates an electrical path for the current to flow through, thus providing overcurrent protection for the connected device. When the thermal element is cooled down, the resistance of the element is reset back to its initial state, thus allowing the device to reset and return to its normal operating state. The resettable fuse can then be used again to protect the device. Since the PTC Resettable Fuses can reset and be used multiple times, they are lower in cost when compared to the traditional fuse, and provide protection for a longer period of time.

Conclusion

The 0ZCJ0025AF2E is a type of PTC Resettable Fuse used in many automotive and other electronic applications as a form of protection against overcurrent. The fuse works by using a thermal element that increases resistance when heated by the current overload, thus providing protection for the connected device. When the thermal element cools down, the resistance is reset back to its initial state, allowing the device to reset and return to its normal operating state. The resettable fuse can then be reused multiple times, thus making it lower in cost and a more effective form of protection.

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