ZJSHUYI Basic principles of MCCB product selection.www.shuyitop.com; #mccb

In civil building design, low-voltage circuit breakers are mainly used for line overload, short-circuit, over-current, voltage loss, under-voltage, grounding, leakage, automatic switching of dual power sources, and protection and operation of motors during infrequent starting. Principles In addition to complying with basic principles such as the use environment characteristics of low-voltage electrical equipment (see Industrial and Civil Power Distribution Design Manual), the following conditions should be considered: 1) The rated voltage of the circuit breaker should not be less than the rated voltage of the line; 2) The rated current of the circuit breaker and the rated current of the overcurrent release are not less than the calculated current of the line; 3) The rated short-circuit breaking capacity of the circuit breaker is not less than the maximum short-circuit current in the line; 4) The selection of power distribution circuit breakers needs to consider the short-time delay short-circuit on-off capability and the coordination between delay protection levels; 5) The rated voltage of the undervoltage release of the circuit breaker is equal to the rated voltage of the line; 6) When used for motor protection, the selection of circuit breaker should consider the starting current of the motor and make it not operate within the starting time; see "Industrial and Civil Power Distribution Design Manual" for design calculations; 7) The selection of circuit breakers should also consider the selective coordination of circuit breakers and circuit breakers, circuit breakers and fuses. www.shuyitop.com; Tel/Fax: 0086-577-62840011 WhatsApp: 008613355775769 #ZJSHUYI #chinashuyi #shuyitop #MCCB #breaker