1.Working Principle Negative Temperature Coefficient NTC chip: Low temperature = high resistance; High temperature = low resistance The circuit board judges the soleplate temperature via resistance changes, automatically switching the heating element on/off to keep stable ironing heat. 2. General Standard Parameters R25: 100KΩ / 50KΩ mainstream B-value: 3950K, 4100K Temperature accuracy: ±1~2℃ Operating temperature: -40℃ ~ 220℃ (adapt to high ironing temperature) Heat-resistant, anti-steam & anti-scale performance 3. Product Structure Glass sealed high-temperature NTC core (no drift under long-term high heat) Small flat copper / aluminum sensing head for close contact with heating plate High-temperature silicone wire (200℃ heat resistance) High temperature insulation braided sleeve Small terminal lugs for PCB welding 4. Main Functions Constant temperature control for different fabrics Automatically adjust heat: low temp for silk, medium for cotton, high temp for linen Overheat safety protection Cut off heating power when abnormal ultra-high temperature occurs to prevent burning clothes or fire hazards Steam temperature matching control Coordinate steam output temperature to avoid cold steam affecting ironing effect 5. Common Fault Phenomena Iron cannot heat up or keeps overheating Temperature gear adjustment fails, single temperature only Automatically power off during use Clothes easily scorched due to out-of-control high temperature 6. Application Scope Household steam electric irons, handheld mini garment irons, industrial clothing ironing machines