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3VT5 Molded Case Circuit Breakers up to 1600 A
Circuit breakers · Switch disconnectors
6/10
Siemens LV 36 · 2008
6
■
Functions
Switching states in the circuit breaker cavities
0 = contact open
1 = contact closed
■
Design
Main circuit
• Connected with Cu/Al busbars or cables, and possibly cables
with cable lugs.
• For greater connecting options, connecting sets are produced
(see page 6/6).
• 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 (switching of input and output terminals) without
limiting rated short-circuit ultimate breaking capacity
I
cu
.
• In case of reversed connection, the circuit breaker/switch dis-
connector must be provided with 3VT9 500-8CE30 phase
barriers also on the side of terminals 2, 4, 6 (for detailed infor-
mation, see page 6/12).
• We recommend painting the connecting busbars.
• 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
circuit breaker’s deionization spaces (see page 6/12).
Auxiliary circuits
• Switches, shunt releases or undervoltage releases are con-
nected using flexible 0.5 ... 1 mm
2
Cu conductors to the
terminals on these devices.
• Auxiliary circuits of the withdrawable version are connected
using a connector.
Recommended cross-sections for cables, busbars and flexibars
for fixed-mounted, plug-in and withdrawable versions
1)
The withdrawable device connected by 2 x 50 x 12 mm Cu busbars can be
loaded with max. 1420 A. For 1600 A loading, the withdrawable version
must be connected by 2 x 50 x 12 mm busbars.
Maximum circuit breaker/switch disconnector loads in
accordance with ambient temperature
3VT4 circuit breaker/switch disconnector - connection of
Cu busbars 2 x 50 x 6 mm to pole
3VT5 circuit breaker/switch disconnector - connection of
Cu busbars 2 x 50 x 6 mm to pole
3VT5 circuit breaker/switch disconnector - connection of
Cu busbars 2 x 50 x 10 mm to pole
Accessory compartment
1, 2
3, 4
Cicuit breaker position
Lever positon
of circuit breaker
State of the main contacts
3VT9 500-2AF10
3VT9 500-2AF10
Switched on
1
1 0 0 1 1 0 0 1
Switched off manually or
electrically by operating
mechanism
0
0 1 1 0 1 0 0 1
Switched off by the overcurrent
release, auxiliary release or by
TEST pushbutton
0
0 1 1 0 0 1 1 0
Rated current
I
n
Permissible cross-
section S
Busbars W x H
Cu
AI
Cu
Al
A
mm
2
mm
2
mm
mm
250
120
150
400
185
240
500
2 x 150 2 x 185
630
2 x 185 2 x 240
800
2 x 240 3 x 240 50 x 10 2 x 50 x 5 2 x 50 x 8
1000
2 x 240 3 x 240 2 x 50 x 6
1300
3 x 240 4 x 240
2 x 50 x 10
1500 (1450)
1)
4 x 240
2 x 50 x 10
1600 (1450)
1)
2 x 50 x 10
1)
50 °C
55 °C 60 °C
65 °C
70 °C
1000 A
1000 A 1000 A
1000 A
980 A
50 °C
55 °C 60 °C
65 °C
70 °C
1400 A
1400 A 1340 A
1260 A
1200 A
50 °C
55 °C 60 °C
65 °C
70 °C
1600 A
1540 A 1460 A
1400 A
1320 A