Siemens SENTRON 3VA1, Руководство пользователя

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Accessories
4.4 Plug-in and draw-out technology
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03
289
Installation instructions
The draw-out socket is permanently mounted in the panel by means of the mounting screws
included in the complete kit for draw-out technology.
The molded case circuit breaker / switch disconnector in molded case circuit breaker design
is supplied with two assembly bolts (3-pole version) or four assembly bolts (4-pole version).
These bolts are not required if the device is to be converted to a draw-out unit.
Terminal cover
Two terminal covers are included in the scope of supply of the complete kit for draw-out
technology and the conversion kit for draw-out technology for the molded case circuit
breaker. These two terminal covers are intended for installation over the molded case circuit
breaker. If terminal covers are to be attached to the busbars of the draw-out socket, they
must be ordered separately, see chapter Insulating measures (Page 246).
Autotrip plunger
An autotrip plunger is supplied as standard with every complete kit and every conversion kit
for converting a molded case circuit breaker to draw-out technology.
WARNING
Make sure that the autotrip plunger is correctly installed
The molded case circuit breaker cannot be safely moved into or out of the socket without
an autotrip plunger. Moving it into or out of the socket when the main contacts are closed
(breaker position ON) can cause arcs to form between contacts and result in irreparable
damage to the circuit breaker or the electrical installation, and possibly cause physical
injury to personnel.
Once installed, the autotrip plunger cannot be dismantled again!
Note the color coding and labels for the autotrip plunger:
•
Plug-in technology: Black, labeled "Plug-in"
•
Draw-out technology: Grey, labeled "Draw-out"
When a molded case circuit breaker is converted to a molded case circuit breaker for draw-
out technology, the autotrip plunger is installed from the rear of the device and latched.
The plunger performs various safety functions in operation:
● It prevents closure of the main contacts of the molded case circuit breaker when the
breaker is inserted in the draw-out socket and in an undefined position (breaker status
indication is UNBLOCK).
● It allows the breaker to be closed in the defined positions TEST and CONNECT.
● It trips the molded case circuit breaker (TRIP) when the breaker's main contacts are
closed (switching position ON) and an attempt is made to move the breaker out of one of
the three defined positions CONNECT, TEST or DISCON using the crank handle.