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KSD9700 / KSD301 / KSD302 / JUC-31F / T01 / T06 / 7SOY / 17SOY / YS11 thermostat is a common Bimetal temperature control protection switch, which adopts the working principle of overheating power-off of bimetallic strip.
Porcelana “3diputado / 6AP/ 8 a. m. / 2 a. m. / 3diputado / 17AM+PTC sobre corriente & protector bimetálico temporal” es un tipo de dispositivo de seguridad eléctrica que combina un estándar ” 3diputado ” Protector de sobrecarga térmica bimetálico con coeficiente de temperatura positivo. (PTC) termistor, permitiéndole reaccionar ante una corriente excesiva (sobrecorriente) y altas temperaturas, Corta automáticamente la energía y se reinicia una vez que se resuelve el problema.; esencialmente actúa como un fusible reajustable con protección de temperatura adicional.
 common Bimetal temperature control protection switch |
 Snap Disc Limit Switch KSD9700 Temperature Control |
 Interruptor térmico de protección contra sobretemperatura |
Key components and function:
•Bimetallic protector:
This is the primary overcurrent protection mechanism, consisting of a bimetallic disc that bends and breaks the circuit when too much current flows through it, causing excessive heat generation.
•PTC Thermistor (Positive Temperature Coefficient):
This component further enhances protection by significantly increasing its resistance when it reaches a preset temperature, further limiting current flow in case of overheating.
How it works:
1. 1. Normal Operation:
When current is within safe limits, both the bimetallic disc and PTC thermistor operate normally, allowing current to flow freely.
2. 2. Overcurrent Condition:
If the current exceeds a preset threshold, the bimetallic disc heats up and bends, interrupting the circuit.
3. 3. High Temperature Condition:
Simultaneously, the PTC thermistor also heats up due to high current, drastically increasing its resistance and further limiting current flow.
4. 4. Resetting:
Once the fault is removed and the components cool down, the bimetallic disc returns to its original shape, re-establishing the circuit, and the PTC thermistor resets to its low resistance state, ready to protect again.
 17AM+PTC sobre corriente & protector bimetálico temporal |
 17SOY / 3MP bimetallic thermal overload protector with PTC |
 3diputado / 6AP Limit Switch Motor over current – protector térmico |
Aplicaciones:
• Motor Protection:
Commonly used in electric motors for appliances like washing machines, secadoras, and vacuum cleaners to protect against overload situations.
• Power Supply Protection:
Can be integrated into power supplies to prevent damage from overcurrent or overheating events.
Important points to consider:
• Current Rating:
Each protector is designed for a specific current rating, which should be matched to the application.
• Trip Time:
The time it takes for the protector to trip depends on the overcurrent level and the design of the bimetallic disc.
• Temperature Rating:
The PTC thermistor has a specific temperature threshold at which it activates, ensuring protection against excessive heat.