Ptc Thermistor Over-current Protector

We hold immense expertise in manufacturing and exporting PTC Thermistor Over-Current Protector in Shenzhen, Guangdong, China. PTC Thermistor Current Protectors are used instead of conventional fuses to protect load, such as motors, transformers, or electronic circuit, against over current for circuit protection. PTC Thermistor Current Protector not only respond to inadmissible high currents but also if a preset temperature limit is exceeded. PTC thermistor over-current protector limits the power dissipation of the whole circuit by increasing their resistance and thus reducing the current to a harmless residual value. In contrast to conventional fuses, PTC thermistor resettable fuses do not have to be replaced after elimination of the fault but resume their protective function immediately after a short cooling-down time.
When a circuit is in the normal status, the current through PTC is lower than the rated current and PTC thermistor protector is in the normal state with small resistance value, which will not affect the normal operation of the protected circuit. In case of some fault in the circuit and the current is greater than the rated current, the PTC thermistor protector will become hot quickly and present a high resistance state, which sets the circuit relatively "off" to protect the circuit from damage. After the fault is removed, PTC thermistor protector will automatically restore its low resistance state and the circuit will resume normal operation.