SRP175

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As modern households and businesses become increasingly dependent on electrical and electronics products, PTC Resettable Fuses have become an indispensable component in many applications.

PTC Resettable Fuses are also known as Polymeric Positive Temperature Coefficient (PPTC) fuses or Polyfuse™ fuses.

They are temperature-sensing fuses that are designed to protect electronic devices from voltage overloads and short circuits. The resettable fuse works by increasing its resistance to high levels of current when it surpasses its current rating. This causes the resistance of the fuse to increase, which raises the resistance of the circuit and consequently trips the system.

Littelfuse’s SRP175 is a resettable fuse, typically used to protect AC power lines. It uses a positive temperature coefficient (PTC) composition, which means that the resistance of the fuse increases as the temperature rises. SRP175 is designed to trip off and interrupt the current when it reaches a set current limit.

The operation of SRP175 is based on a low wattage PTC thermistor. It is composed of highly conductive polymer with a temperature coefficient of 0.172%. It consists of a filament suspended between two contact points.

When the current passing through the SRP175 reaches a threshold level of overload, it causes the SRP175 thermistor to heat up. This increases the temperature and consequently increases the resistance of the thermistor, which causes it to trip off and interrupt the current.

Once the current is interrupted, the thermistor cools down and returns to its original resistance state. This allows the current flow to resume and the circuit returns to its working state.

SRP175 PTC Resettable Fuses are commonly used in electronic appliances and automotive applications. The most common applications for SRP175 PTC Resettable Fuses are rotary speed controls, medical equipment, electronic power supplies, fan circuits, pumps, automotive audio systems, and electronic light dimmers.

In addition, SRP175 offers a wide range of protection options. It has two current ratings, 400mA and 800mA, which can be used in various applications. It is available in various voltage ratings from 6V to 24V.

SRP175 PTC Resettable Fuses are available as an IntelliFuse™, which allows for various current limit settings. The adjustable current limit allows the PTC to be used in applications requiring variable current protection. Another advantage of the IntelliFuse™ is that it allows a higher current rating to protect circuits during short-term overloads. This helps to reduce the possibility of component damage due to surges.

SRP175 PTC Resettable Fuses are small, reliable, and easy to use while providing excellent current protection. They are typically mounted directly on a circuit board and require no additional support components. Furthermore, they can be used in a wide range of applications and are becoming increasingly popular.

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