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The basic component of the relay contactor control circuit is low-voltage electrical appliances. Generally, electrical appliances with a rated voltage level below AC 1200 V-DC 1500 V are called low-voltage electrical appliances. Due to the many types of low voltage electrical appliances, various functions, various structures and uses Wide range, different working principles. Therefore, there are many classification methods for commonly used low-voltage electrical appliances.
1. According to purpose or control object
Low voltage electrical appliances for scrap metal shears can be divided into power distribution electrical appliances and control electrical appliances according to their purposes or control objects.
Power distribution appliances
Power distribution appliances are mainly used in low voltage power distribution systems. The system is required to ensure accurate action and reliable operation in the event of a failure, and to have the corresponding dynamic qualitative and hot-pull qualitative under the specified conditions. The electrical appliances will not be damaged. Commonly used power distribution appliances include knife switches, transfer switches, fuses, and circuit breakers.
Control-side electrical appliances are mainly used in electric drive systems. The system is required to have the characteristics of long life, small size, heavy weight and lightness, and quick, accurate, and sizable actions. Commonly used control appliances include contactors, relays, starters, master appliances and electromagnets.
2. According to the way of action
Commonly used low voltage electrical appliances can be divided into automatic electrical appliances and manual electrical appliances according to the action mode. "Automatic electrical appliances The Baidong electrical appliances can automatically complete the on or off actions, such as contactors and relays, according to the changes of their own parameters or the action of external signals.
Manual electrical appliances refer to electrical appliances that are switched by manual operation, such as knife switches, change-over switches, and buttons.
3. According to the contact category
Commonly used low voltage electrical appliances can be divided into electrical appliances with contacts and electrical appliances without contacts according to the type of contacts.
Electrical appliances with contacts
Electrical appliances with contacts can switch circuits by turning on and off the contacts, such as contactors, knife switches, and buttons.
Electrical appliances without contacts
Electrical appliances without contacts have no separable contacts. It mainly uses the switching effect of electronic components. That is, on and off to realize the on and off control of the circuit. Such as proximity switches, electric dry time relays and solid state electrical appliances.
4. According to the working principle
Commonly used low-voltage electrical appliances can be divided into electromagnetic electrical appliances and non-electromagnetic control electrical appliances according to the principle of T.
Electromagnetic appliances are appliances that act according to the principle of electromagnetic induction, such as contactors, relays, and electromagnets.
Non-electromagnetic control side electrical appliances
Non-electromagnetic control electrical appliances refer to electrical appliances that rely on changes in external force or non-electrical full signals (such as speed, pressure, inkstone, etc.), such as changeover switches, travel switches, speed relays, pressure relays, and penetration relays.