150 / 267
3VT3 Molded Case Circuit Breakers up to 630 A
Accessories and Components
Mechanical interlocking and parallel switching
4/30
Siemens LV 36 · 2008
4
■
Function
3VT9 300-8LA00 mechanical interlocking
Provides mechanical interlocking of two circuit breakers/switch-
disconnectors so that they cannot both be tripped simulta-
neously, but only one of them at a time. Both circuit breakers may
be turned off simultaneously. Interlocking can be used between
two 3VT3 circuit breakers or between 3VT3 and 3VT2 circuit
breakers. Both circuit breakers must be furnished with a hand
drive (at least one with a manual operating mechanism and
knob), see page 4/48.
In order to use the interlocking, it is absolutely necessary to com-
ply with the dimensions shown in the figure and table.
3VT9 300-8LB00 mechanical parallel switching
Provides for simultaneous switching of two circuit breakers/
switch-disconnectors. Parallel switching can be used between
two 3VT3
1)
circuit breakers or between 3VT3 and 3VT2 circuit
breakers. Each circuit breaker must be equipped with a manual
operating mechanism and at least one with a knob, see page
4/48.
In order to use parallel switching it is absolutely necessary to
comply with the dimensions shown in the figure and table.
1)
Switching unit 3VT3, 4P (4-pole design) can only be on the right side.
Left
switching
unit
Right switching unit
3VT2, 3P
3VT2, 4P
3VT3, 3P
3VT3, 4P
X L
X L
X L
X L
mm mm mm mm mm mm mm mm
3VT2, 3P 105 112 140 145.5 122.5 128.5 181 185.5
3VT2, 4P 105 112 140 145.5 122.5 128.5 181 185.5
3VT3, 3P 122.5 128.5 157.5 145.5 140 145.5 185 189
3VT3, 4P 122.5 128.5 157.5 145.5 140 145.5 185 189
X
L
5
3
1
TEST
NSO0_00233
Left
switching
unit
Right switching unit
3VT2, 3P
3VT2, 4P
3VT3, 3P
3VT3, 4P
1)
X
L
X
L
X
L
X L
mm mm mm mm mm mm mm mm
3VT2, 3P 105
+7
164.5
+7
122.5
+7
164.5
+7
122.5
+7
164.5
+7
x x
3VT2, 4P 105
+7
164.5
+7
122.5
+7
164.5
+7
122.5
+7
164.5
+7
x x
3VT3, 3P 122.5
+7
164.5
+7
140
+7
164.5
+7
140
+7
164.5
+7
x x
3VT3, 4P 122.5
+7
164.5
+7
140
+7
164.5
+7
140
+7
164.5
+7
x x
TEST
NSO0_00234
RP-BD-CK10
PS
PS
PS
X
TEST
RP-BD-CK10
PS
PS
PS
SP
SV
TEST
RP-BD-CK10
PS
PS
PS
SP
SV
NSO0_00235