DESCRIPTION
The UTC M54133A is a semiconductor integrated circuit developed for use in high-speed earth leakage breakers incorporating functions to protect against voltage surges and inverter noise.

FEATURES
* Improvement of ability against unwanted tripping by lightning-surge and lightning impulse.
   Two times counting system adopted.
* Improvement of ability against unwanted tripping by inverter-noise.
   Built-in operational amplifier (of low current dissipation) for active low-pass filter.
   Improved high-frequency, high harmonic superposition performance
* Internal time delay function
* An external capacitor is used to set the delay time.
* High input sensitivity: VT=11.5mVrms Typ.
* Low-current dissipation (at RIREF=180kΩ)
   In stand-by condition: IS=610μA Typ.
* High stabilities design
   Adopt the circuits that is not affected by fluctuations of supply voltage/ambient temperature.