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3VT3 Molded Case Circuit Breakers up to 630 A
Circuit breakers · Switch disconnectors
4/11
Siemens LV 36 · 2008
4
■
Design
Installation and connection
Main circuit
• Is connected using Cu or Al busbars or cables, and possibly
cables with cable lugs
• For further connecting options, connecting sets can be used
(see page 4/9)
• Generally, conductors from the power supply are connected
to input terminals 1, 3, 5, (N) and conductors from the load to
terminals 2, 4, 6, (N). However, it is possible to reverse this
connection (exchanging input and output terminals) without
limiting the rated short-circuit ultimate breaking capacity
I
cu
)
• In case of feed-in from below, the circuit breakers/switch dis-
connectors must be fitted with 3VT9 300-8CE30 phase barri-
ers also on the side of terminals 2, 4, 6
• We recommend painting the connecting busbars in different
colors
• Input and output conductors/busbars must be mechanically
reinforced to avoid transmitting electrodynamic force to the
circuit breaker/switch disconnector during short-circuiting
• The way of connecting the main circuit must observe the
deionization space of the circuit breaker/switch disconnector
(see page 4/43)
.
Auxiliary circuits
• Auxiliary switches, shunt releases or undervoltage releases
are connected to the terminals using flexible 0.5 ... 1 mm
2
Cu
conductors.
• The motorized operating mechanism and auxiliary circuits of
the plug-in or withdrawable design are connected using a
connector.
Recommended cross-sections of cables, busbars and flexibars
for fixed-mounted, plug-in and withdrawable designs
Maximum circuit breaker/switch disconnector loads
in accordance with the ambient temperature
3VT3 circuit breaker/switch disconnector connection to pole
by 1 x 185 mm
2
Cu cable
Conductor cross-sections of main terminals
Rated current
I
n
Permissible cross-section
S
Dimensions of busbars
W x H
Cu
AI
Cu
Al
A
mm
2
mm
2
mm
mm
100
35
50
20 x 2
25 x 2
125
50
70
25 x 2
25 x 3
160
70
95
25 x 3
32 x 3
200
95
120
25 x 4
25 x 5
250
120
150
25 x 5
32 x 5
315
150
185
32 x 5
32 x 6
400
185
240
32 x 6
32 x 8
500
2 x120
2 x185
32 x 8
32 x 12
630
2 x185
2 x240
32 x 12
32 x 16
50°C
55 °C
60 °C
65 °C
70 °C
630 A
630 A
600 A
570 A
540 A
Order No.
Rated
current
I
n
Maximum permissible conductor cross-section S
Cable type
Sector-shaped
conductor, stranded
Sector-shaped
conductor, solid
Round conductor,
stranded
Round conductor,
solid
Busbars and
cable lugs
Technical infor-
mation
W x H
A
mm
2
mm
2
mm
2
mm
2
mm
Page
3VT9 300-4TA30
630
32 x...
3VT9 300-4TD00
3VT9 300-4RC30
630
32 x...
4/46, 4/57,
4/57, 4/57
3VT9 300-4RC00
3VT9 300-4TC30
400
35 ... 240 Cu
35 ... 240 Cu
35 ... 240 Cu
35 ... 240 Cu
--
3VT9 300-4TC00
3VT9 324-4TD30
400
150 ... 240 Cu/Al
120 ... 240 Cu/Al
150 ... 240 Cu/Al
120 ... 240 Cu/Al
3VT9 324-4TD00
3VT9 315-4TD30
315
25 ... 150 Cu/AI
16 ... 150 Cu/AI
25 ... 150 Cu/AI
16 ... 150 Cu/AI
3VT9 315-4TD00
3VT9 324-4TF30
630
2 x (150 ... 240) Cu/Al 2 x (120 ... 240) Cu/Al 2 x (25 ... 150) Cu/Al
2 x (120 ... 240) Cu/Al
4/45, 4/56
3VT9 324-4TF00
3VT9 315-4TF30
500
2 x (25 ... 150) Cu/Al
2 x (16 ... 150) Cu/Al
2 x (25 ... 150) Cu/Al
2 x (16 ... 150) Cu/Al
4/46, 4/57
3VT9 315-4TF00
3VT9 303-4TF30
250
6 x (6 ... 35) CuAl
6 x (6 ... 35) CuAl
6 x (6 ... 35) CuAl
6 x (6 ... 35) CuAl
4/46, 4/57
3VT9 303-4TF00
3VT9 300-4ED30
400
4/47
3VT9 300-4EE30
630
4/47
3VT9 300-4TN30
10/16
1.5 ... 2.54 ... 6 flexible conductor