Automotive motor thermal protectors, also known as overload devices or inherent motor protection, are crucial for preventing electric motors from overheating and potentially failing. They detect excessive temperature or current and shut down the motor to prevent damage. These protectors are designed to protect the motor’s internal components, such as windings and insulation, from damage caused by overheating.
To install a motor thermal protector correctly, ensure it’s placed in a location that accurately detects the motor’s temperature, typically near the windings or stator. Proper wiring is crucial, and the protection settings should be adjusted based on the motor’s design and the operating environment.
The Thermostat Switch KSD301 bimetallic disc operates in a Normally Open (NO) configuration. This means the circuit is initially open (disconnected) at normal temperatures. When the temperature rises to a predefined threshold, the bimetallic disc bends, closing the circuit and allowing current flow.
NC type is the “emergency brake” for safety protection, and NO type is the “temperature trigger” for intelligent control. The action logics of the two are complementary. The selection must strictly match the circuit function requirements (comprehensive).
The bimetallic strip is the “temperature sensor + actuator” integrated component of KSD301. Its disc-shaped structure design and alloy ratio directly determine the temperature control accuracy and reliability.
NTC (negative temperature coefficient) temperature sensor is a temperature measuring element that uses the exponential decrease in the resistance of a thermistor as the temperature rises. Its core is a ceramic semiconductor made by sintering metal oxides (such as manganese, cobalt, and nickel), and the temperature is inferred by measuring the change in resistance. The following are its core technical characteristics, applications, and selection points:
NTC (negative temperature coefficient) temperature sensor is a temperature measuring element that uses the exponential decrease in the resistance of a thermistor as the temperature rises. Its core is a ceramic semiconductor made by sintering metal oxides (such as manganese, cobalt, and nickel), and the temperature is inferred by measuring the change in resistance. The following are its core technical characteristics, applications, and selection points:
There are four main temperature sensors used today in modern-day electronics: Negative temperature coefficient (NTC) thermistors, resistance temperature detectors (RTDs), thermocouples, and semiconductor-based integrated (IC) sensors.
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