Nanjing Huaju Electronics grandly launches the composite PTC thermistor WMZ13A series composite PTC thermistor with dual protection functions of overvoltage and overcurrent protection. Huaju Electronics creatively combines the PTC thermistor with overcurrent protection function and the overvoltage protection function. The protective varistor is packaged into a device so that they are coupled to each other to have both overcurrent protection and overvoltage protection. These products have been widely used in smart instruments, high-performance small switching power supplies, and LED lighting, producing good economic and social benefits.

　　1. Application scope: WMZ13A series PTC thermistor is a protective element that automatically protects and recovers against abnormal temperatures and abnormal currents. It replaces traditional fuses and can be widely used for overcurrent in motors, transformers, electronic circuits, etc. Overload protection. The thermistor reduces the residual current value by limiting consumption in the entire line through sudden changes in its resistance value. In a traditional fuse line, it cannot recover by itself after it is blown, while a PTC thermistor can resume its protective function after the fault is removed. .

　　To choose a PTC thermistor as an overload protection component, first confirm the maximum normal operating current of the line (that is, the non-operating current of the PTC thermistor) and the maximum ambient temperature of the PTC thermistor installation location (during normal operation ), and secondly, the protection Current (that is, the operating current of the PTC thermistor), maximum operating voltage, rated zero power resistance, and factors such as the overall size of the component should also be considered. As shown in the figure below: the relationship between the operating environment temperature, non-operating current and operating current.

　　2. Application scope: Mainly used for overcurrent, overload and short-circuit protection of smart meters, transformers, motors, switching power supplies, chargers, adapters, instruments, control panels, household appliances, air conditioners, microwave ovens, etc.

　　3. Application principle:

　　Connect the overcurrent protection and overvoltage protection PTC thermistor in series in the power circuit. When the circuit is in a normal state, the current flowing through the PTC is less than the rated current. The PTC is in normal state and has a very small resistance, which will not affect electronic equipment and other devices. Protect the normal operation of the circuit. When the circuit current greatly exceeds the rated current, the PTC suddenly heats up and the resistance suddenly increases to a high resistance state, thus limiting or blocking the current and protecting the circuit from damage. After the current returns to normal, the PTC also automatically returns to the low resistance state, and the circuit returns to normal operation. Similarly, when the external voltage fluctuates, the varistor plays an overvoltage protection function. The increase in current flowing through the PTC thermistor can also cause the PTC to suddenly heat up, and the resistance value suddenly increases to a high resistance state, thereby limiting or blocking the current and protecting the voltage. The PTC thermistor with overcurrent and overvoltage protection has a wide range of applications in instrumentation.

　　3. Model name, appearance structure and dimensions:

　　Composite PTC thermistor for small power switching power supply to prevent overvoltage

　　In order to thank many power meter users for their strong support and help to our company's products over the years, our company launched a composite PTC thermistor in early 2007. This product is an important product of our company. Since its launch on the market, it has solved many problems that have troubled electric energy meter companies and has received strong support from most merchants!

In addition, WMZ13A can also be used for lightning protection and overcurrent and overvoltage protection. Or overvoltage and overcurrent protection for other electronic equipment.

The following products have the characteristics of small steady-state resistance, low rated current, high voltage resistance, and fast response speed. They are economical and applicable choices for realizing 485 communication interface protection. Since its launch on the market, it has received a good response from the market.

Resistant to 220Vac, 380Vac 485 communication interface protection

PTC thermistor for primary overvoltage and overcurrent protection of transformer

The WMZ13A type PTC thermistor produced by Huaju Electronics is mainly installed in the power input end of microcomputer control boards of various household appliances, instruments and meters or in communication lines and communication equipment for overcurrent, overvoltage, overheating and lightning protection. This product is also called a 10,000-time fuse or a self-restoring fuse in electronic engineering. Due to its dual sensitivity to temperature and current, it makes up for the shortcomings of the temperature switch being insensitive to current and the conventional fuse being insensitive to temperature. It has the advantages of fast response, strong protection capability, and high reliability. It is a kind of Really high quality and low price protective components.