The KA2803 is designed for use in earth leakage circuit interrupters, for operation directly off the AC line in breakers. The input of the differential amplifier is connected to the secondary coil of Zero Current Transformer (ZCT). The amplified output of differential amplifier is integrated at external capacitor to gain adequate time delay. The level comparator generates a high level when earth leakage current is greater than the fixed level.

Features:

• Low Power Consumption: 5 mW, 100 V/200 V
• Built-in Voltage Regulator
• High-gain Differential Amplifier
• 0.4 mA Output Current Pulse to Trigger SCRs
• Low External Part Count
• SOP Package, High Packing Density
• High Noise Immunity, Large Surge Margin
• Super Temperature Characteristic of Input Sensitivity
• Wide Operating Temperature Range:

TA=−25°C to +80°C for KA2803B and KA2803BDTF

TA = −25°C to +100°C for KA2803CDTF

• Operation from 12 V to 20 V Input

Package: PDIP-8

Datasheet: https://www.onsemi.com/pdf/datasheet/ka2803-d.pdf