NDM3-125 molded case circuit breaker it is a commonly used electrical protection device with reliable power-off function and accurate overload protection. This article will introduce the tripping principle and curve characteristics of NDM3-125 molded case circuit breaker to help readers better understand its working principle and performance characteristics.

1. tripping principle
   the tripping principle of NDM3-125 molded case circuit breaker is realized by electromagnetic attraction and tripping mechanism. When there is an overload or short-circuit fault in the circuit, the current will exceed the set value, causing the electromagnetic suction device to generate a magnetic field, pull the tripping mechanism, make the circuit breaker trip instantly, cut off the circuit, and realize the function of electrical protection. The tripping principle ensures that the circuit breaker can disconnect the power supply in time under abnormal circuit conditions to avoid damage to electrical equipment or fire accidents.

2. Curve characteristics
   the curve characteristic of NDM3-125 molded case circuit breaker refers to its breaking protection characteristic curve, which usually includes two types: time-current curve and time-power curve. These curves describe the breaking protection characteristics of the circuit breaker under different current and time conditions, which can help the user select the appropriate circuit breaker for electrical protection.

• time-current curve: The time-current curve shows the instantaneous action characteristics and overload protection characteristics of the circuit breaker. The different points on the curve represent the action time of the circuit breaker under different currents. The user can select the appropriate circuit breaker according to the actual load of the circuit.
• time-power curve: The time-power curve describes the operating characteristics of the circuit breaker under different power factors. These curves can help users understand the protection performance of the circuit breaker under different load conditions and ensure the safe and reliable operation of the circuit.

3. Advantages of NDM3-125 molded case circuit breaker

• high-performance protection: NDM3-125 molded case circuit breakers have precise overload protection and short-circuit protection functions, which can effectively protect electrical equipment and circuit safety.
• Strong reliability: the tripping principle and curve characteristics ensure the reliable power-off function of the circuit breaker under various abnormal circuit conditions, and ensure the safety of electrical equipment and personnel.
• Easy to use: The NDM3-125 molded case circuit breaker is easy to install and easy to operate, and is suitable for the protection needs of various electrical systems and equipment.

4. Application Scenarios
   NDM3-125 molded case circuit breakers are widely used in industrial, commercial and residential electrical systems for overload and short circuit protection. Its tripping principle and curve characteristics make it an important equipment in the field of electrical protection, ensuring the safe operation of the circuit and the long life of the equipment.

Through the introduction of tripping principle and curve characteristics of NDM3-125 molded case circuit breaker in this paper, we hope that readers can have a more comprehensive understanding of this important electrical protection equipment, and provide better reference and guidance for the design and operation of electrical systems.