PTC thermitors (Mz 72,73,74) are mainly used for:
1.automatic elimination influence of stray magnetic fields due to residual magnetism of cathode cover and explosion-proof ring in colour kinescope as well as geomagnetism on colour image in colour TV set, and colour display. 2.starting circuits of frequency-converter air-conditioners and compressor of refrigerator. It is the domestic product for substituting Murata PTH490 and PTH491 series TDK912 series etc.
3.overcurrent protection in distributing networks, programming commutator and other telecommunication and electronic instruments.

This product has many advanttages, such as large sudden current, small residual current, low power dissipation, high breakdown voltage,simple structure, high reliability, long life and safety for use.