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3VT2 Molded Case Circuit Breakers up to 250 A
Circuit breakers · Switch disconnectors
3/11
Siemens LV 36 · 2008
3
■
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 are produced
(see page 3/9).
• Generally, conductors from the power supply are connected
to input terminals 1, 3, 5 and conductors from the load to ter-
minals 2, 4, 6. But it is possible to exchange this connection
(exchanging input and output terminals without limiting 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 with different
colors
• Input and output connectors/busbars must be mechanically
reinforced in order to avoid transferring electrodynamic forces
to the circuit breaker during short circuiting
• The way of connecting the power circuit must observe the
deionization space of the circuit breaker/switch disconnector
(see page 3/42)
.
Auxiliary circuits
• Switches, shunt releases or undervoltage releases are con-
nected using flexible 0.5 ... 1 mm
2
Cu conductors to terminals
on these devices
• Motorized operating mechanism and auxiliary circuits of the
plug-in or withdrawable design are connected using a con-
nector.
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
3VT2 circuit breaker/switch disconnector connection to pole
by 1 x 120 mm
2
Cu cable
Conductor cross-sections of main terminals
Rated current
I
n
Permissible cross-section
S
Busbars
W x H
Cu
Al
Cu
Al
A
mm
2
mm
2
mm
mm
40
10
16
50
10
16
63
16
25
80
25
35
100
35
50
20 x 2
25 x 2
125
50
70
25 x 2
25 x 3
160
70
95
25 x 3
25 x 4
200
95
120
25 x 4
25 x 5
250
120
150
25 x 5
25 x 6
50 °C
55 °C
60 °C
65 °C
70 °C
250 A
250 A
250 A
250 A
250 A
Order No.
Rated
current
I
n
Maximum permissible conductor cross-section
Cable type
Sector-shaped
conductor,
stranded
Sector-shaped
conductor, solid
Round
conductor, stranded
Round
conductor,
solid
Busbars and
cable lugs
Technical
information
W x H
A
mm
2
mm
2
mm
2
mm
2
mm
Page
3VT9 200-4TA30
250
25 x ...
3VT9 200-4RC30
250
25 x ...
3/45, 3/55
3VT9 215-4TF00
3VT9 200-4TC30
250
16 ... 150 Cu
10 ...150 Cu
16 ... 150
10 ...150 Cu
3VT9 200-4TC00
3VT9 215-4TD30
250
25 ... 150 Cu/Al
16 ...150 Cu/Al
25 ... 150 Cu/Al
16 ... 150 Cu/Al
3VT9 215-4TD00
3VT9 224-4TD30
250
150 ... 240 Cu/Al
120 ... 240 Cu/Al
150 ... 240 Cu/Al
120 ... 240 Cu/Al
3/44, 3/55
3VT9 224-4TD00
3VT9 215-4TF30
250
2 x (25 ... 150) Cu/Al
2 x (16 ... 150) Cu/Al
2 x (25 ... 150) Cu/Al
2 x (16 ... 150) Cu/Al
3/44, 3/55
3VT9 215-4TF00
3VT9 224-4TF30
250
2 x (150 ... 240) Cu/Al 2 x (120 ... 240) Cu/Al 2 x (150 ... 240) Cu/Al 2 x (120 ... 240) Cu/Al
3/44, 3/56
3VT9 224-4TF00
3VT9 203-4TF30
250
6 x (6 ... 35) Cu/Al
6 x (6 ... 35) Cu/Al
6 x (6 ... 35) Cu/Al
6 x (6 ... 35) Cu/Al
3/45, 3/56
3VT9 203-4TF00
3VT9 200-4ED30
250
3/46
3VT9 200-4EE30
250
3/46
3VT9 200-4TN30
10/16
1,5 ... 2,54 ... 6 Cu flexible conductor