A circuit breaker refers to a switching device that can close, carry, and break the current under normal circuit conditions, and can close, carry, and break the current under abnormal circuit conditions within a specified time. Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their scope of use. The division of high and low voltage boundaries is relatively vague, and generally, those above 3kV are referred to as high-voltage electrical appliances.
Circuit breakers can be used to distribute electrical energy, infrequently start asynchronous motors, protect power lines and motors, and automatically cut off circuits in the event of severe overload, short circuit, and undervoltage faults. Their function is equivalent to a combination of fuse type switches and over/under heating relays. Moreover, it is generally not necessary to change the components after breaking the fault current. It has been widely applied.
Distribution is an extremely important link in the generation, transmission, and use of electricity. The distribution system includes transformers and various high and low voltage electrical equipment, while low voltage circuit breakers are widely used electrical appliances.
Explanation of commonly used circuit breaker series models
DZL25 series leakage circuit breaker: suitable for circuits with AC 50Hz, rated voltage up to 380V, and rated current up to 200A, used for electric shock and leakage protection. It can also be used to protect circuits and motors from overload and short circuits, as well as for infrequent switching of circuits and infrequent starting of motors.
H-series molded case circuit breakers: suitable for distribution networks with AC 50Hz~60Hz, rated working voltage up to 690V, DC 250V, and rated current up to 1200A. Used for distributing electrical energy, protecting circuits and civilian equipment from overload, undervoltage, and short circuits, as well as infrequently breaking and connecting power lines under normal conditions. The TO and TG series circuit breakers are suitable for rated currents of 600a and below, AC 50Hz, rated working voltage of 690v and below, DC 230v and below, and are generally used for distribution. Circuit breakers with rated currents of 225a and below can be used for infrequent and infrequent switching of lines, as well as infrequent starting of motors.
DZ108 (3ve) series plastic shell circuit breaker: suitable for circuits with AC 50-60Hz, voltage up to 660V, and rated current ranging from 0.1 to 63a. Used as overload and short circuit protection for electric motors. And it can be used as a full voltage starter for starting and breaking motors under AC-3 loads, as well as for overload and short circuit protection of lines and power equipment in distribution networks.
DZ30 (dpn), dz30k (dpnk), and dz23 circuit breakers: suitable for single-phase residential lines with AC 50Hz or 60Hz and rated voltage of 220V, used for leakage protection, and for single-phase residential lines in civil electrical lines. They also cut off the live wires of civil electrical lines simultaneously and can still protect against leakage even in the case of reverse fire connection.
The filtering device inside the electronic leakage and overvoltage protection circuit breaker can prevent false tripping caused by instantaneous voltage (interference from lighting and other equipment lines) and instantaneous current (such as capacitive load lines).
DZ302 (dpnl) and DZ23l leakage circuit breakers: suitable for single-phase residential lines with AC 50Hz or 60Hz and rated voltage of 220V, to protect electrical lines from overload and short circuit. This product has high breaking capacity, small volume, and a width of 36mm. Simultaneously cutting off the live and live wires eliminates the risk of personal injury and fire caused by the reverse connection of the live and live wires or the potential of the zero wire to the ground. It is currently the most ideal distribution protection switch in the field of civil residential buildings.
AC30 series modular socket: It is a supporting electrical component of modular terminal combination appliances installed indoors, and can also be installed in other complete electrical boxes to connect and plug electrical equipment.
DZ47 Leakage Tripping Circuit Breaker: With a shunt trip function, suitable for AC 50Hz or 60Hz, rated working voltage 230V, rated current up to 63A in power lines. It can remotely control or automatically signal control the circuit breaking, while also providing overload and short circuit protection for the line. It can also be used for infrequent operation and switching of the line.
DZ47LE series leakage circuit breaker: suitable for AC 50Hz, rated voltage up to 400V, and rated current up to 50A lines, used for leakage protection. When someone is electrocuted or the leakage current of the circuit exceeds the specified value, the residual current circuit breaker can automatically cut off the power supply in a very short time, ensuring personal safety and preventing accidents caused by leakage current of the equipment.
DZ47LE-63 series leakage circuit breaker: suitable for AC 50Hz rated voltage 380V and below, rated current up to 63a, used for leakage protection. When someone is electrocuted or the leakage current of the circuit exceeds the specified value, the electromagnetic leakage protection switch is mainly used for leakage, electric shock, overload, and short circuit protection of AC 50Hz and voltage 250V lines. The product has the characteristics of reliable operation, beautiful appearance, and convenient use.
Residual Current Circuit Breaker: A switch that automatically operates when the residual current in a circuit exceeds a predetermined value. The commonly used residual current circuit breakers are divided into voltage type and current type, while current type is further divided into electromagnetic type and electronic type.
Leakage circuit breakers are used to prevent personal electric shock and should be selected based on the different requirements for direct and indirect electric shock protection.