We
all are aware that electricity has become an indispensable component of our
lives but the main fact is it comes with its hazards to human life and
property. Electrocution and fire being are the two major risks closely related
to electricity. When it comes to the protection of electrical circuits the RCCB Residual Current Circuit Breaker is
an important safety measure. It is a current sensing device, which
automatically measures and disconnects the circuit whenever there is a fault
that occurs in the connected circuit or the current exceeds the rated sensitivity.
RCCB
is particularly helpful in instances of sudden earth fault that aims at
protecting an individual from the risk of electric shocks as well as
electrocution and fires. The presence of RCCB makes sure that in such types of
cases, the circuit trips immediately and the person gets protected from an
electric shock.
Principle behind RCCB
On
the principle of Kirchhoff’s law, Hager
Residual Current Circuit Breaker generally works, which says that in a
circuit the incoming current must be equal to the outgoing current. Thus, RCCB
compares the difference in current values between live and neutral wires.
Ideally, the current that flows to the circuit from the live wire needs to be
the same as that flowing through the neutral wire. In case there is a fault,
the current from the neutral wire gets reduced and the differential between the
two is known as Residual Current. The RCCB is triggered to trip off the circuit
when there is a spotting of a Residual Current.
One
thing that ensures that the reliability of RCCB is tested is when a test
circuit is included with the Residual Current Device. The current starts to
flow through the test circuit when the test button is pushed. On the neutral
coil of the device there occurs an imbalance. So the RCCB trips and supply is
disconnected which then checks the reliability of RCCBs.
Advantages of RCCB
- Protects against voltage fluctuation
as it includes a filtering device that guards against transient voltage
levels
- When the rated sensitivity is
exceeded, it automatically disconnects the circuit
- Both cable and busbar connections is
offers the possibility of dual termination
- Against earth fault as well as any leakage current ELCB Residual Current Circuit Breaker
- Provides protection
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