Product Description
PTC overcurrent/overtemperature protection thermistor is an "intelligent" circuit protection component that integrates detection, switching and reset functions. Its self-recovery characteristic is its core advantage, providing efficient, economical and maintenance-free safety protection for modern electronic equipment.
Specification
Product Name: MZB Series PTC Thermistor
R25 : 1-1500Ω±30%
Curie Temperature : 75-150℃
Max Voltage : 265V
Application : Overcurrent and overheat protection
Color : Green
Features
Self-Resettable: Unlike fuses that blow once, PTC overcurrent protectors automatically reset after the fault is cleared, significantly reducing maintenance costs and downtime, while improving equipment reliability and convenience.
Dual Overcurrent and Overtemperature Protection: Its triggering mechanism is based on self-heating. Whether the temperature rise is directly caused by excessive current (I²R heating) or by excessive ambient temperature, as long as the temperature exceeds its switching point (Curie temperature), it will activate, providing dual protection.
Fast Response: It reacts quickly to abnormal overcurrent, transitioning from a low-resistance state to a high-resistance state within milliseconds, effectively suppressing high current surges and preventing fault escalation.
High Reliability and Long Life: Its solid-state polymer construction has no moving parts, is arc-free, and is shock and vibration-resistant, capable of providing over thousands of protection cycles.
Various Specifications Available: Available in a variety of voltage ratings, current ratings, holding currents, and operating times to meet diverse circuit design requirements.
Compact Size: Available in surface mount (SMD) or leaded plug-in form factors, it is ideal for high-density PCB mounting and saves space.
Application
PTC overcurrent/overtemperature protection thermistors, due to their superior protection performance and convenience, are widely used in virtually all electronic devices requiring circuit protection:
1. Battery and Power Supply Protection:
Lithium battery packs: PTCs are essential in battery packs for mobile phones, laptops, tablets, Bluetooth headsets, power tools, drones, and other products to prevent overheating and explosion risks caused by overcharging and short circuits.
Power adapters/chargers: They provide overcurrent protection in primary or secondary circuits.
USB ports/communication lines: They protect USB interfaces, RS-232/485, and other data lines from damage caused by short circuits or hot-plug surges.
2. Motor and Transformer Protection:
Small motors: These include air conditioners, washing machines, fans, and automotive motors. When the motor stalls or is overloaded, causing a surge in current, the PTC activates to protect the motor coil from burning out.
3. Automotive Electronics:
Widely used in ECUs (Electronic Control Units), ABS modules, LED headlights, entertainment systems, and more, these products provide robust protection for various automotive electronic modules, adapting to the harsh operating environment.
4. Consumer Electronics and Home Appliances:
Speakers: Protect audio amplifiers and tweeters from excessive current surges.
Motherboards: Protect the power supply circuits of core components such as the CPU, GPU, and memory.
Various PCBs within TVs, monitors, and smart home devices.
5. Industrial Control and Security Systems:
Provides reliable circuit protection in industrial controllers, sensors, network devices (PoE protection), surveillance cameras, and other devices, ensuring stable system operation.
