Delixi circuit breakers and contactors are used to make and break circuits. The rated current of the circuit breaker is generally greater than that of the contactor (the maximum current medium voltage contactor is 630 A); The circuit breaker has excellent short-circuit current breaking ability (the maximum capacity of the medium-voltage system is 80KA), and the contactor needs a cooperative fuse to break the short-circuit current; The rated current breaking times of the contactor are greater than those of the circuit breaker (generally greater than 300,000 times), which is suitable for frequent operation.
Circuit breaker - a fundamental electrical appliance that has the function of overload, short circuit and undervoltage maintenance, and can maintain the line and power supply, which is called a circuit breaker. It can withstand large loads and large short-circuit currents, and has the function of active circuit breaking.
Use: Connection, disconnection, and active maintenance of power cords and electrical equipment.
Air Switches – Switches that trip when a short circuit occurs and the switch forms a loop are called air switches. The air switch is an air circuit breaker.
Communication contactors use primary contacts to open and close circuits, and auxiliary contacts to fulfill control commands. Generally, the main contact only needs the normally open contact, and the auxiliary contact often has two pairs of contacts, which have normally open and normally closed functions. Small contactors are often used as intermediate relays and work in cooperation with the main circuit. The contacts of the communication contactor are made of silver-tungsten alloy, which has excellent electrical conductivity and high temperature ablation resistance. The operating power of the communication contactor comes from the communication electromagnet, which consists of two young silicon steel sheets in the shape of a "mountain", one of which is fixed and has a coil on it. A wide range of operating voltages are available. In order to stabilize the magnetic force, a short-circuit ring is added to the attracting surface of the core.
After the communication contactor loses power, it is reset by the spring, and the other half is the moving core, which is the same structure as the stator core, and is used to drive the opening and closing of the main contact and auxiliary contact. Contactors above 20 amps are equipped with an arc extinguishing hood that uses the electromagnetic force generated when the circuit is disconnected to quickly break the arc and then maintain the contacts. The communication contactor is manufactured as a whole, and the appearance and function are constantly improving, but the function remains the same. No matter how advanced the skills are, ordinary communication contactors still have an important place.
In fact, the fuse is a kind of short-circuit maintainer, which is widely used in the distribution control system, mainly for short-circuit maintenance or severe overload maintenance. During operation, the fuse is connected in series in the circuit to be maintained. When the circuit is short-circuited or severely overloaded, the fuse in the fuse will actively blow maintenance. The most common is a fuse. In addition, a circuit breaker, commonly known as an "air switch", is also a short-circuit maintainer. In case of overcurrent, it will actively trip for maintenance. Air switches and circuit breakers are both maintenance appliances. But they are not the same. Circuit breaker is a general term that is divided into two types – structural circuit breaker and molded case circuit breaker. Structural type circuit breaker is commonly known as universal circuit breaker; Molded case circuit breaker is commonly known as air starting. They have short-circuit and overload maintenance and are capable of repeated use. The service life is generally in the thousands to tens of thousands of times. A fuse is an electrical appliance that has been melted to maintain a circuit and cannot be reused. After maintenance, the melt needs to be replaced.
Circuit breakers can be divided into high-voltage circuit breakers and low-voltage circuit breakers according to the scale of use. The boundary between high voltage and low voltage is ambiguous, and more than 3 kV is generally considered to be a high-voltage appliance.
Low-voltage circuit breaker, also known as active switch, is an electrical appliance with manual switching function, which can actively carry out loss of voltage, undervoltage, overload, and short-circuit maintenance. It can be used to distribute electrical energy, start asynchronous motors infrequently, maintain power lines and motors, and actively block circuits when they cause severe overloads or short circuits and undervoltages. Its function is equivalent to a combination of fuse-type switches and overheating and overheating relays. Moreover, it is divided into two parts.
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