Description
The FA2803 is a semiconductor integrated circuit with amplifier for a high speed earth leakage circuit breaker The FA2803 circuit for the amplifying parts of earth leakage circuit breaker consist of differential amplifier, latch circuit and voltage regulator.
It is connected to the secondary node of zero-current transformer (ZCT) which detects leakage current in the both input of the differential amplifier.
Signals amplified by differential amplifier are integrated by an external capacitor, and connects to the input terminal of latch circuit with output suitable for the characteristics of high-speed earth leakage circuit breaker. Latch circuit keeps low in the output till the input voltage reaches the fixed level, and output becomes high when the leakage current is greater than some level. It drives a thyristor connected to the output terminal of latch circuit.

FEATUREs
● Good temperature characteristics of input sensitivity current
● High Input Sensitivity (VT = 13.5mVrms Typ.)
● Low external component count
● High noise and surge-proof
● Low Power consumption (PD = 5mW) 100V/ 200V
● 100V/200V Common Built-in Voltage Regulator
● Wide Operating Temperature Range (TA= -40 to 85℃)