Distribution board bus bar module having leakage current limiting function

A distribution board bus bar module having a leakage current limiting function, the distribution board bus bar module comprising:

• a main bus bar made of a conductive material, which is connected to an output side of a main circuit breaker that blocks power distributed from a three-phase four-wire cable of a three-phase power system and includes a first-phase main bus bar, a second-phase main bus bar, a third-phase main bus bar, and a neutral main bus bar respectively connected to an output terminal of a first-phase voltage line, an output terminal of a second-phase voltage line, an output terminal of a third-phase voltage line, and an output terminal of a neutral line of the main circuit breaker;
• a plurality of sub-bus bars made of a conductive material, which are connected between the main bus bar and input sides of a plurality of sub-circuit breakers that block power distributed to terminal loads and include a first-phase sub-bus bar connected between the first-phase main bus bar and an input terminal of a first-phase voltage line of each sub-circuit breaker, a second-phase sub-bus bar connected between the second-phase main bus bar and an input terminal of a second-phase voltage line of each sub-circuit breaker, a third-phase sub-bus bar connected between the third-phase main bus bar and an input terminal of a third-phase voltage line (T line) of each sub-circuit breaker, and a neutral sub-bus bar connected between the neutral main bus bar and an input terminal of a neutral line of each sub-circuit breaker;
• and
• a neutral main bus bar area expansion unit, the neutral main bus bar area expansion unit includes:
• an upper area expansion unit made of a conductive material, the upper area expansion unit includes a contact part that protrudes downward to contact an upper surface of the neutral main bus bar, and
• a lower area expansion unit made of a conductive material, an upper portion of the lower area expansion unit and a lower portion of the upper area expansion unit are coupled in contact with each other,
• the upper area expansion unit and the lower upper area expansion unit expand the area of the neutral main bus bar so as to limit a leakage current of the distribution board bus bar module, and
• the upper area expansion unit and the lower upper area expansion unit surround a portion of the first-phase main bus bar and a portion of the first-phase sub-bus bar where the first-phase main bus bar and the first-phase sub-bus bar are connected, a portion of the second-phase main bus bar and a portion of the second-phase sub-bus bar where the second-phase main bus bar and the second-phase sub-bus bar are connected, a portion of the third-phase main bus bar and a portion of the third-phase sub-bus bar where the third-phase main bus bar and the third-phase sub-bus bar are connected, and a portion of the neutral main bus bar and a portion of the neutral sub-bus bar where the neutral main bus bar and the neutral sub-bus bar are connected.