Selection Specifications and Matching Rules of Thermal Magnetic MCCB

Reasonable selection of thermal magnetic MCCB is the premise to ensure circuit protection effect. Users need to select specifications according to system voltage, circuit operating current and load characteristics. First, match the rated voltage of the breaker with the power system voltage to ensure insulation safety. The rated current should be 1.1 to 1.25 times of the normal maximum operating current to avoid frequent overload tripping during stable operation.

For inductive loads such as motors and fans with startup impact current, select thermal magnetic MCCB with appropriate current level to tolerate instantaneous startup current. For resistive loads such as lighting and heating equipment, conventional standard models can meet the protection demands. The short-circuit breaking capacity must be higher than the system maximum short-circuit current to ensure safe fault breaking.

SWGCT thermal magnetic MCCB provides complete current specifications and pole number options for accurate engineering matching.

Users need to select 2-pole, 3-pole or 4-pole models according to single-phase and three-phase circuit types. It is necessary to avoid blindly pursuing large current specifications, which will cause protection insensitivity and leave hidden safety hazards. Standard selection and matching can maximize the protection performance of thermal magnetic MCCB and ensure the safe operation of power distribution circuits. SWGCT standard thermal magnetic MCCB complies with international electrical selection standards.