Breaker Switch
Key to Acronyms
TR Transformer
TC Trip Coil
ZCT Zero Cross Terminal
R Resistance Test Switch
M Load Device
Ig Current Leakage
The breaker switch mechanism consists of a ZCT (Zero Cross Terminal), a sensor inside the breaker switch
unit checks the amplified signals from a detection device.
The main power supply line runs through the ZCT. The ZCT generates a signal if it detects any fluctuation
in the power supply caused by a short circuit.
Normally, the current phase is zero and the breaker does not operate.
When a short circuit occurs:
• The current leakage (Ia + Ib Ic = Ig) flows.
• Voltage is generated at the secondary winding.
• The amplitude of the detection device increases
4. Replacement and Adjustment
404
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