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KSD9700 / KSD301 / KSD302 / JUC-31F / S01 / S06 / 7BIN / 17BIN / YS11 thermostat is a common Bimetal temperature control protection switch, which adopts the working principle of overheating power-off of bimetallic strip.
China “3Abgeordneter / 6AP/ 8 Uhr / 2 Uhr / 3Abgeordneter / 17AM+PTC Überstrom & Bimetallischer Temperaturschutz” ist eine Art elektrisches Sicherheitsgerät, das einen Standard kombiniert ” 3Abgeordneter ” Bimetallischer thermischer Überlastschutz mit positivem Temperaturkoeffizienten (PTC) Thermistor, Dadurch kann es auf übermäßigen Strom reagieren (Überstrom) und hohe Temperaturen, Die Stromversorgung wird automatisch unterbrochen und zurückgesetzt, sobald das Problem behoben ist; fungiert im Wesentlichen als rücksetzbare Sicherung mit zusätzlichem Temperaturschutz.
 common Bimetal temperature control protection switch |
 Snap Disc Limit Switch KSD9700 Temperature Control |
 Thermischer Übertemperaturschutzschalter |
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 Überstrom & Bimetallischer Temperaturschutz |
 17BIN / 3MP bimetallic thermal overload protector with PTC |
 3Abgeordneter / 6AP Limit Switch Motor over current – Wärmeschutz |
Anwendungen:
• Motor Protection:
Commonly used in electric motors for appliances like washing machines, dryers, 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.