Application of modified PBT engineering plastics in low voltage electrical appliances

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Recently, developed a high grade flame retardant PBT engineering plastic, the product has long-term heat aging performance, excellent electrical insulation performance and arc resistance characteristics, can be widely used in circuit breakers, air switches and other products. At present, the product has passed the United States UL laboratory yellow card certification, and is used in the circuit breaker products by the world famous industrial electrical suppliers.


What is a circuit breaker?


Circuit breaker refers to a switching device that can close, carry and break the current under normal loop conditions and can close, carry and break the current under abnormal loop conditions within a specified time.


Circuit breaker can be used to distribute electric energy, infrequently start asynchronous motor, the power line and motor protection, when they occur serious overload or short circuit and undervoltage fault can automatically cut off the circuit, its function is equivalent to fuse switch and underheat relay combination. And there is generally no need to change parts after breaking the fault current. At present, it has been widely used.


In modern society, no matter industry, agriculture, transportation, national defense, culture, education and health, finance, commerce, tourism services and people's life and other fields are inseparable from electricity. Distribution is an extremely important link in the generation, transmission and use of electricity. Distribution system includes transformer and all kinds of high and low voltage electrical equipment, low voltage circuit breaker is a kind of widely used electrical appliances.


Air switch can be seen everywhere in life, is a kind of switch that will automatically disconnect as long as the current in the circuit exceeds the rated current. It can protect the circuit or electrical equipment from short circuit, serious overload and undervoltage, etc. It is a very important electrical appliance in the low-voltage distribution network and power drive system.


Several characteristics of the special modified PBT material for circuit breaker housing:


1. Excellent mechanical properties


Because this material is mainly used for the shell of circuit breaker, so the mechanical properties of the material have higher requirements. The material is required to be resistant to fatigue, dimensional stability, no deformation at high temperature, with creep resistance and other characteristics.


2. High grade flame retardant performance


For electronic and electrical materials, the flame retardant has strict requirements, Nantong Star circuit breaker shell special modified PBT material through the United States UL94-V0 yellow card certification, high temperature resistance, excellent safety performance.


3. Excellent electrical performance


High volume resistivity and dielectric strength, excellent arc resistance, minimal moisture absorption, in humid and high temperature environment, also can maintain stable electrical properties, is the manufacture of electronic, electrical parts of the ideal material.


4. Excellent machining performance


Easy molding processing and secondary processing, injection or extrusion of ordinary equipment. Due to the fast crystallization speed, good fluidity, mold temperature is also lower than other engineering plastics requirements, at the same time, no floating fiber precipitation on the surface of the workpiece, the surface gloss is high.


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