7.2.1.2.3 Opening by shunt releases

7.2.1.2.3 Opening by shunt releases N/A
7.2.1.4
part 1
Limits of operation of shunt releases
A shunt release for opening shall cause tripping
under all operating conditions of an equipment
when the supply voltage of the shunt release
measured during the tripping operation remains
between 70% and 110% of the rated control supply
voltage and, if a.c., at the rated frequency
N/A
7.2.1.5
part 1
Limits of operation of current operated relays and released
Limits of operation of current operated relays and
releases shall be stated in the relevant product
standard
N/A
Page 23 of 80 Report No. 3302407.50
IEC 60947-2
Clause Requirement + Test Result - Remark Verdict
TRF No. IEC60947_2F
7.2.1.2.4 Opening by over-current releases
a) Opening under short-circuit conditions
The short-circuit release shall cause tripping of the
circuit-breaker with an accuracy of 20% of the
tripping current value of the current setting for all
values of the current setting of the short-circuit
current release
P
Where necessary for over-current co-ordination the
manufacturer shall provide information (usually
curves) showing
N/A
- maximum cut-off (let-through) peak current as a
function of prospective current (r.m.s. symmetrical)
N/A
- I2t characteristics for circuit-breakers of utilization
category A and, if applicable, B for circuit-breakers
with instantaneous override (see note to 8.3.5)
N/A
b) Opening under overload conditions
1) Instantaneous or definite time-delay operation N/A
The release shall cause tripping of the circuitbreaker
with an accuracy of + 10% of the tripping
current value of the current setting for all values of
current setting of the overload release
N/A
2) Inverse time-delay operation
At the reference temperature and at 1,05 times the
current setting with the conventional non-tripping
current, the opening release being energized on all
poles, tripping shall not occur in less than the
conventional time from the cold state, i.e. with the
circuit-breaker at the reference temperature
P
Moreover, when at the end of the conventional
time the value of current is immediately raised to
1,30 times the current setting, i.e. with the
conventional tripping current, tripping shall then
occur in less than the conventional time later
P
If a release is declared by the manufacturer as
substantially independent of ambient temperature,
the current values of table 6 shall apply within the
temperature band declared by the manufacturer,
within a tolerance of 0,3%/K
N/A
The width of the temperature band shall be at least
10 K on either side of the reference temperature
N/A
Page 24 of 80 Report No. 3302407.50
IEC 60947-2
Clause Requirement + Test Result - Remark Verdict
TRF No. IEC60947_2F
7.2.4.2 Operational performance capability
7.2.4.2
part 1
The operational performance off-load for which the
tests are made with the control circuits energized
and the main circuit not energized, in order to
demonstrate that the equipment meets the
operating conditions specified at the upper and
lower limits of supply voltage and/or pressure
specified for the control circuit during closing and
opening operations
P
The operational performance on-load during which
the equipment shall make and break the specified
current corresponding, where relevant, to its
utilization category for the number of operations
stated in the relevant product standard