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KSD9700 / KSD301 / KSD302 / JUC-31F / S01 / S06 / 7SUIS / 17SUIS / YS11 thermostat is a common Bimetal temperature control protection switch, which adopts the working principle of overheating power-off of bimetallic strip.
Chine “3Député / 6AP/ 8h00 /2h00 / 3Député / 17AM+PTC surintensité & protecteur bimétallique temp” est un type de dispositif de sécurité électrique qui combine une norme ” 3Député ” protecteur de surcharge thermique bimétallique à coefficient de température positif (CTP) thermistance, lui permettant à la fois de réagir à un courant excessif (surintensité) et des températures élevées, coupe automatiquement l'alimentation et se réinitialise une fois le problème résolu; agissant essentiellement comme un fusible réarmable avec une protection supplémentaire contre la température.
 common Bimetal temperature control protection switch |
 Snap Disc Limit Switch KSD9700 Temperature Control |
 Interrupteur de protection thermique contre la surchauffe |
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 surintensité & protecteur bimétallique temp |
 17SUIS / 3MP bimetallic thermal overload protector with PTC |
 3Député / 6AP Limit Switch Motor over current – protecteur thermique |
Applications:
• Motor Protection:
Commonly used in electric motors for appliances like washing machines, séchoirs, 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.