In electric power drive and transmission systems, low-voltage electrical components play a crucial role. According to incomplete statistics, China currently produces approximately 120 series of such components, covering nearly 600 types and tens of thousands of specifications. These switchgear devices are used for various purposes and under different operational conditions, which means the selection process varies depending on the application. However, there are two fundamental principles that should be followed in general:
The Safety Principle
Safety is the most essential requirement when it comes to switchgear. It must ensure the reliable operation of circuits and electrical equipment, serving as a critical guarantee for both normal production and daily life. Any failure in the system could lead to serious consequences, including damage to equipment or even personal injury.
The Economic Principle
Economic considerations involve both the cost of the switchgear itself and the value it generates during use. The former requires careful selection and proper application, while the latter emphasizes the need for reliability. A failure in the switchgear can result in production downtime, equipment damage, and even safety hazards, all of which have significant economic impacts.
Key Considerations
Before selecting any switchgear, it’s important to understand the classification and working environment of the controlled object—such as motors or other electrical devices. You should also verify relevant technical data, including rated voltage, power, starting current ratio, load type, operating frequency, and working system. Additionally, consider the normal operating conditions, such as ambient temperature, humidity, altitude, installation orientation, vibration, presence of harmful gases, conductive dust, and exposure to rain or snow. Finally, familiarize yourself with the main technical specifications of the electrical equipment, including its usage category, rated voltage, control power, connection and breaking capacity, allowable operating frequency, working system, and expected service life.
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