DESCRIPTION
The M54128 is a semiconductor integrated circuit designed for high-speed type earth leakage breakers. This lC includes leakage and abnormal voltage detecting functions.

FEATURES
● lmprovement of ability against unwanted tripping due to Iightning-surge.
   • Adopt the two times counting system.
   • lmprovement of ability against needless action due to lightning impulse.
● lt is a possible that cope with lEC owing to mode change.
   • Adopt the 1.5 times counting system.
● High input impedance :
   • Filter circuit can be formed with externally attached C/R.
   • lmprovement of ability against needless action due to high frequency and high harmonics.
● High input sensitivity : VT = 6.5mVrms
● Abnormal voltage detecting (neutral conductor open-phase protection) function :
   • Neutral conductor open-phase protection at single-phase three wire system
   • ln case of no use this function, stop this function and reduction of circuit current, possible.
● Low voltage operation : 7 to12V (conventional Mitsubishi lCs : 12 to 20V)
● Low current dissipation :
   • In stand-by condition : 820µA typical (Vs = 9V, Ta = 25°C)
   • When SCR is ON : 740µA typical (Vs = 9V, Ta = 25°C)
● Highly stable design : Employment of circuits of which characteristics fluctuations resulting from changes in supply voltage/ambient temperature are small.

APPLICATION
  Earth leakage breaker