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HomeSafe Product Guide 21
Working principle
The RCCB works on the current balance principle. The
supply conductors, i.e. the phases and the neutral, are
passed through a toroid and form the primary windings of
a current transformer. Its secondary winding is connected
to a highly sensitive electromagnetic trip relay, which
operates the trip mechanism.
In a healthy circuit, the sum of the currents in phases, is
equal to the current in the neutral and the vector sum of all
currents is equal to zero. If there is any insulation fault in
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do not balance and their vector sum is not equal to zero.
This imbalance is detected by the core balanced current
transformer, the RCCB is tripped and supply to load is
interrupted. The trip mechanism is operated at a residual
current between 50-100 % of its rated tripping current.
Technical Information
Standard Conformity
IS 12640-1: IEC 61008-1
Rated Current (In)
A
25, 40, 63
Sensitivity (In)
mA
30
Rated Voltage (Un)
Vac
240
Rated Insulation Voltage (Ui)
V
660
Rated Frequency
Hz
50
Short circuit Withstand Capacity
kA
6
Residual Making Breaking Capacity A
500 A or 10 In whichever is greater
Ambient Temperature
oC
-25°C to + 55°C
Shock Resistance
40 mm free fall
Vibration Resistance
g
3
Electrical /Mechanical operations
10000
Mounting
Din Rail (35 x 7.5) mm
Degree of Protection
IP 20
Terminal Capacity (max)
mm2
25
*500 mA is available on request
Two Pole