Ground Fault Interrupter GFI

1
Ground Fault Interrupter (GFI)
1 Human resistance
2 How does GFI work?
3 Mecanism of short circuit
4 APPLICATIONS
Exit
2
Human resistance
3
30mA limitation
Function..
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3
Normal use
Relay (balanced) Switch off the current if the
core demands
Core To detect a default current. It checks
balance Ia Ir
Leakage generation
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4
Abnormal use
Relay (off balance) Switch off current drived
by the core.
Tore Detect a leakage of current Ia gt
Ir when Ileakage gt 30mA
Generation of default current
Mecanism
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5
Mecanism of short circuit
Composition of circuit breaker A ground fault
with core B printed circuit with relay C
manual control D switch off chamber
Applications
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6
APPLICATIONS
Residual Current operating Circuit Breaker
MCBGFI
In functin of circuit breaker - lights -
engines - heatings - domestic and industry It
switches off at 30mA (24mA) within 20ms.
ex home
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7
Home
Electrical table at home
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