Siemens SENTRON - Page 71

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A
A.3 Keytermsanddenitionsforspecifyingtheswitchingcapacity
Rated switching capacity I
m
of the RCCB (EN 61008-1):
Prospective rms value of the short-circuit current which a residual current
operated circuit breaker can make, carry and break under dened conditions.
Rated switching capacity I
cn
of an RCBO (EN 61009-1):
The rated switching capacity of an RCBO is the limit short-circuit breaking capacity
specied by the manufacturer.
Rated residual switching capacity I
Δm
(EN 61008-1, EN 61009-1):
Prospective rms value of the residual current which the residual current protective
device can make, carry and break under dened conditions.
Rated conditional short-circuit current I
nc
(EN 61008-1):
Prospective current which the residual current operated circuit breaker pro-
tected by a short-circuit back-up fuse can withstand without suffering functional
impairment.
Rated conditional residual short-circuit current I
Δc
(EN 61008-1):
Prospective residual current which the residual current operated circuit breaker
protected by a short-circuit back-up fuse can withstand without subsequent func-
tional impairment.