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3VT3 Molded Case Circuit Breakers up to 630 A
Accessories and Components
Mechanical interlocking and parallel switching
4/31
Siemens LV 36 · 2008
4
3VT9 300-8LC.0 Mechanical interlocking
• Provides mechanical interlocking of two circuit break-
ers/switch-disconnectors so that they cannot both be tripped
simultaneously, but only one of them at a time. Both circuit
breakers may be turned off simultaneously.
• 3VT9 300-8LC10 mechanical interlocking is intended for two
3VT3 circuit breakers. 3VT9 300-8LC20 interlocking is in-
tended for one BH630 circuit breaker and one 3VT2.
• Circuit breakers may be in fixed, plug-in and withdrawable
designs.
Circuit breaker placement in switchgear
Detailed information can be found in the instructions for use,
which you may download from our website
www.siemens.com/technical assistance
.
Order No. of mechanical
interlocking
3VT9 300-8LC10 3VT9 300-8LC20
Circuit breaker types
3VT3
3VT2
3VT3
3VT3
NSO0_00366
0 ... 700
TEST
ON
OFF
TEST
ON
OFF
30
45
148
R = 40
min
min. 80