1.Working Principle Built-in NTC negative temperature coefficient thermistor: Motor temperature rises → sensor resistance drops; temperature falls → resistance rises. The main board judges motor heat status through resistance changes, executes power-off protection to avoid motor burnout. 2. Common Technical Parameters R25: 10kΩ / 50kΩ B-value: 3950K, 3990K Temperature accuracy: ±1~2℃ Operating temperature: -40℃ ~ 150℃ Anti-vibration, dust-proof, small size for motor installation 3. Product Structure Glass sealed high-stability NTC chip Mini flat copper/metal patch probe (fits motor surface tightly) High temperature resistant thin silicone wire Insulation heat shrink tube Small soldering terminals for circuit board connection 4. Core Functions Motor overheat automatic protection Shredders generate heavy heat during long continuous shredding. When motor temperature exceeds safety threshold, the machine immediately stops working to prevent coil burning and fire hazards. Recovery temperature detection After cooling down to safe temperature, the sensor feeds back low-temperature signal, and the shredder restores normal operation automatically. Working time intelligent limit assistance Cooperate with timing logic to remind users of intermittent shredding for heavy-duty use. 5. Typical Fault Performance Shredder stops working quickly after short-time use Cannot restart after cooling for a long time Motor gets extremely hot with no auto-shutdown protection Machine fails to respond when overloaded and overheated 6. Application Scope Household mini shredders, office cross-cut paper shredders, commercial heavy-duty shredders, industrial file disintegrators