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UNISONIC TECHNOLOGIES CO., LTD
M54223
LINEAR INTEGRATED CIRCUIT
EARTH LEAKAGE CURRENT DETECTOR
DESCRIPTION
The UTC M54223 is a semiconductor integrated circuit with amplifier for a high-speed earth leakage circuit breaker.
For the amplifying parts of earth leakage circuit breaker, the UTC M54223 consists of differential amplifier, latch circuit and voltage regulator.
In normal operating, the UTC M54223 should be connected to the secondary side of the ZCT (zero current transformers). Here the ZCT detects leakage current different amplifiers’ both input.
Then the signals which have been amplified are integrated by an external capacitor. The integrated signal connects to the input terminal whose output is suitable for the characteristics of highspeed earth leakage circuit breaker.