User Manual

Parameter
Details chapter
Disconnectors
Fuses
Circuit break-
ers
Load switches
Contactor
Starters
Rated isolation voltage U
i
2.3.1
P P P P P
Rated operational voltage U
e
(<U
i
)
2.3.2
P P P P P
Rated impulse withstand voltage U
imp
2.3.3
P P P P
Rated operational current I
e
2.3.2
P P P P P
Utilization category
2.3.2
P P P P
Short-circuit withstand capacity / short-circuit
protection
2.3.4
P P P
Rated short-circuit making capacity I
cm
2.3.4.6.1
P P
Rated short-circuit breaking capacity I
cu
, I
cs
2.3.4.6.2
P P
Cut-off current
2.3.4.2
2.3.4.4
C C
Let-through energy (Joule integral)
2.3.4.1
2.3.4.4
C C
Rated short time current I
cw
2.3.4.3
C C C
Short-circuit coordination
(Type 1, Type 2) with fuses or circuit breakers
2.3.4.5.2
P
Thermal load
2.3.5
P P P P
Ambient temperature
2.3.5.1
C C C C C
Operational overcurrents
(for example heavy-duty starting)
2.3.5.2
C C C C C
Life span
2.3.6
C C
Frequency of operation
2.3.7
C C
Rated frequency / harmonics
2.3.8
2.4.3
C C C C C
Safety clearances
2.3.9
P P P
Mounting position
2.3.10
C C
Pollution degree
2.3.3
A A A A A
Overvoltage category
2.3.3
A A A A A
Protective separation
2.3.11
A A A A A
Site altitude
2.3.12
A A A A A
Shock and vibration
2.3.13
A A A A A
Humidity / climatic loading A A A A A
Chemical ambient influences A A A A A
Radioactive radiation A A A A A
UV radiation A A A A A
External form / IP degree of protection A A A A A
Tab. 2.3-1
Selection criteria for low-voltage switchgear for main circuits
P … Primary selection factors
C … Complementary selection factors
A … Additional criteria
LVSAM-WP001A-EN-P - April 2009
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