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China
Personne àcontacter Mr. Rosa
11-502, Songpingshan, Langshan Road, North Area, Shenzhen High-tech Industrial Park, Nanshan, Shenzhen, Guangdong
Ceramic PTC (positive temperature coefficient) thermistors are used
instead of conventional fuses to protect load, such as motors,
transformers, or electronic circuit, against overcurrent for
circuit protection. PTC thermistor protector not only respond to
inadmissibly 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.
PTC Thermistor Over-current Protector Application
It applies in the over-current overload and short circuit
protection of transformers, battery charger, switches, switch power
supply, adaptor, meter, instrumentation, apparatus, electronic
coils, control panels, air conditioner, automotive electron,
etc.
Operating Principle of PTC Thermistor for Overload Over-current
Protection
The operating principle is as indicated in the following. 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.
