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3VT3 Molded Case Circuit Breakers up to 630 A
Project planning aids
4/43
Siemens LV 36 · 2008
4
■
Dimensional drawings
Use of phase barriers and terminal covers for circuit
breakers and switch disconnectors
Fixed-mounted design
Front connection
• Terminals 1, 3, 5
- If U
e
= AC 415 V, it is necessary to use 3VT9 300-8CE30
phase barriers or 3VT9 300-8CB30 terminal covers
- For the connection of the main circuit to terminals 1, 3, 5, in-
sulated conductors, flexibars or rear connection terminals
are not used. It is necessary to use 3VT9 300-8CE30 phase
barriers or 3VT9 300-8CB30 terminal cover.
• Terminals 2, 4, 6
Only in case that the circuit breaker/switch disconnector is
connected to the the power supply using terminals 2, 4, 6 and
furthermore: if Ue AC 415 V, it is necessary to use 3VT9 300-
8CE30 phase barriers or a 3VT9 300-8CB30 terminal cover
- if insulated conductors are not used for connecting the main
circuit to terminals 2, 4, 6 , flexibars or rear connection are
not used, it is necessary to use 3VT9 300-8CE30 phase bar-
riers or 3VT9 300-8CB30 terminal cover.
Rear connection
• Neither phase barriers nor terminal covers need not be used.
Plug-in and withdrawable design
Neither phase barriers nor terminal covers need be used.
2 4 6
TEST
ON
OFF
2 4 6
TEST
ON
OFF
2 4 6
1 3 5
275
20
TEST
ON
OFF
B = 0
NSO0_00259
A
A1
D
A2
C = 0
1 3 5
1 3 5
B = 105 C = 80
B = 20
140
140
140
100 … 150
B = 20
3VT9 300-8CE30
1
1
1
A
minimum distance between the circuit breaker/switch-
disconnctor and uninsulated earthed wall (applicable for
connecting using insulated conductors, cables, flexibars
or with rear connection)
A1
minimum insulation length of bare conductors (using
3VT9 300-8CE30 phase barriers from 100 mm to max. 150
mm, or by adding additional insulation for the conductors
with barriers to obtain at least A1 value)
A2
minimum distance:
• between the circuit breaker/switch-disconnector and un-
insulated earthed wall (applicable for uninsulated con-
ductors and busbars)
• between the circuit breaker/switch-disconnector and
busbar
• between two circuit breaker/switch-disconnectors situat-
ed vertically above one another
• between uninsulated connections of two circuit break-
ers/switch-disconnectors above one another
B, C minimum distance between the circuit breaker/switch-dis-
connector and uninsulated earthed wall
D
minimum distance between uninsulated conductors