Applications
3.2 Using the 3WA circuit breaker for motor protection
3WA1 air circuit breaker
Equipment Manual, 02/2023, 92310000002-06
205
Trip classes T
C
Trip class T
C
specifies the tripping time T
p
with a symmetrical 3-pole load, starting from
the cold state, with 7.2 times the set current I
r
according to IEC EN 60947 4-1.
p
p
Tripping time t
r
of the 3WA circuit breaker's overload protection LT is defined at 6 times
the current setting value I
r
and can be set in the range from 0.5 to 30 s.
For overload protection LT with I
2
t characteristic, tripping time t
r
can be assigned to the
tripping time T
p
and a trip class T
c
.
at 6 times the current setting
at 7.2 times the current
5 10A 10 20 30
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