232 / 267
3VT5 Molded Case Circuit Breakers up to 1600 A
Accessories and Components
Mechanical interlocking and parallel switching
6/30
Siemens LV 36 · 2008
6
■
Technical specifications
3VT9 300-8LA00 Mechanical interlocking
• It provides interlocking of two circuit breakers so that they can-
not be on-state simultaneously, but always only one of them.
• It is possible to use the locking device between two circuit
breakers 3VT4 or 3VT5 or between circuit breakers 3VT4 and
3VT5. Both circuit breakers must be furnished with a hand
drive (at least with the hand drive unit and hand drive lever),
see page 6/6. In order to use locking, it is necessary to adhere
to the dimensions.
3VT9 500-8LC10 Mechanical interlocking by Bowden
• Provides mechanical interlocking of two circuit breakers so
that they cannot both be tripped simultaneously, but only one
of them at a time.
• Interlocking can be used between two 3VT4 or 3VT5 circuit
breakers or between a 3VT4 and a 3VT5 circuit breaker. For in-
terlocking, circuit breakers can be outfitted with a hand or mo-
tor drive. To use interlocking, it is absolutely necessary to com-
ply with the dimensions that are shown on pg. 6/45.
Mechanical interlocking by Bowden between fixed and withdrawable
3VT5 circuit breakers
Option for locating circuit breakers/switch disconnectors
NSO0_00472
50
NSO0_00473
4x
Ø
9
190
70
70
314
Type of mechanical interlocking Combination of circuit breaker/switch
disconnector designs
3VT9 500-8LC10
fixed-fixed
3VT9 500-8LC30
fixed-withdrawable
3VT9 500-8LC40
withdrawable-withdrawable
NSO0_00474
130
47
140
31
OK
ON
OFF
ON
OFF
0 or 350 ... 1400
72.5
R = 75
min
Ø
2.3
R = 75
min
125.9