Siemens 3VT VT250 Instructions De Service page 8

Operating Instructions
Installation type
For the VT250 the fixed-mounted circuit breaker is the basic
version. This can be converted very easily into a plug-in version
with the aid of the appropriate mounting set. This set contains
blade contacts, a locking pin and terminal covers for the plug-in
version. See Fig. 5 for VT250 plug-in version pictures and
dimensions.
(5) VT250 plug-in version circuit breaker
CAUTION
If an undervoltage release has been installed, it must be
energized, otherwise the circuit breaker cannot be closed!
After a tripping operation due to thermal overload, the circuit
breaker can only be reclosed after a cooling period of several
minutes.
6 Cross-sections for main conductors and tightening torques
7 Connection diagram for 3- and 4-pole circuit breakers
8 Toggle lever position and switching state
9 Toggle lever switching state indication
10 Shunt trip
11 Undervoltage release
12 1st auxiliary switch
13 2nd auxiliary switch
14 Alarm switch
15 Position of toggle lever
15 Auxiliary switching states
16 Alarm switching states
18 Rating under different temperatures
19 TM trip unit picture and ETU front panel
20 Range of current settings for thermal magnetic overload
tripping
21 Tripping characteristic curve
22 Protective curve of ETU
8
(6)
Rated Cross-section
2
current mm
160 A 70
200 A 95
250 A 120
(7)
Undervoltage release conforms to IEC 947-2
(8)
(9)
Test button
English
Tightening torques
Nm
12 ~ 16
ON
TRIP
RESET
(OFF)
4-pole version
A5E00817855-01